Solar panel suspension system comprising a blocking structure

Abstract

A solar panel suspension system (100) for suspending wind-responsive solar panels (400) is disclosed. The system (100) comprises two suspension points (110), and an elongated arrangement (600) that is suspended and extends between the two suspension points (110). The elongated arrangement (600) comprises the wind-responsive solar panels (400). The elongated arrangement (600) is arranged to permit rotation of the wind-responsive solar panels (400) about a rotation axis (R) running along a main extension direction (ME600) of the elongated arrangement (600). The system (100) further comprises a blocking structure (700, 701, 702, 710, 711, 712, 730, 731, 732, 140) arranged to apply its limitation of the rotation of the wind-responsive solar panels (400) outside a rotation interval.

Description

The embodiments herein relate to solar energy capturing systems, such as solar panels, solar panel arrays, mounting systems for solar panels, and the like. In particular, embodiments of a solar panel suspension system, e.g. for suspension of wind-responsive solar panels, are disclosed.BACKGROUNDSolar energy capturing systems are used to convert light energy to electricity. The conversion of light to electricity is performed by a solar cell, aka photovoltaic cell. The solar cell can be a crystalline silicon cell, a thin-film cell or the like.US16413352 discloses a photovoltaic (PV) module or an array of PV modules which are pivotally mounted from an upper edge and thus designed to hang under the force of gravity and to swing about the upper edge responsive to wind.US9494343B2 discloses a partially non-rigid solar capture mounting system which reduces the risk of damage due to wind. The solar capture mounting system includes at least one pole, a horizontal beam mounted to the pole, and at least one backing plate hanging from the horizontal beam via a pivotal connection. Examples of pivotal connection are bushings with ball bearings, hinges, steel rings and spring clips. Each of the backing plates supports at least one solar cell. Wind pressure against a backing plate pivots the backing plate about the horizontal beam such that the system experiences reduced stress and reduced risk of damage due to wind and wind carried objects.SUMMARYIn view of the aforementioned solar panel suspension systems, the term "wind-responsive solar panels" has been defined in section "detailed description" below.An object may be to provide a solar panel suspension system with an improved ability to remain intact, e.g. undamaged, when exposed to winds, such as strong winds.Accordingly, there is provided a solar panel suspension system for suspending wind-responsive solar panels above ground, thereby making the ground available. However, in some examples, it may be that the ground is not available. The solar panel suspension system comprises two suspension structures directly or indirectly connected to the ground and located at a distance from the ground. Each of the two suspension structures can be a respective distal end of a respective beam, e.g. being substantially vertical. The solar panel suspension system further comprises an elongated arrangement, e.g. at least one elongated arrangement. The elongated arrangement comprises the wind-responsive solar panels. The elongated arrangement is suspended and extends between the two suspension structures. Moreover, the solar panel suspension system comprises an elongated support, such as a wire, a bar, a stick, a beam, or the like, suspended and extending between the two suspension structures. The elongated support is arranged, and e.g. located, or the like, to directly or indirectly hold, or abut, at a distal portion of the elongated arrangement, the wind-responsive solar panels, at an angle, e.g. relatively a vertical plane XY. Then, elongated support is arranged to hold the elongated arrangement, or the solar panel, at the angle, when the wind-responsive solar panels (400) are subjected to wind above a threshold value, or e.g. subjected to wind in an interval.In some embodiments, the aforementioned realization of the wind-responsive solar panel suspension system can be employed for the purpose of improving the system's ability to remain intact when exposed to strong winds. The systems herein can, also or alternatively, reduce the solar panels' fluttering and / or oscillation, which can occur when the panels are subjected to wind. Thanks to that the wind-responsive solar panel merely leans on, or abuts, the elongated support, it is possible for the wind-responsive solar panels to initially hang vertically, i.e. in no wind or little wind conditions, and then, e.g. when exposed to sufficiently strong winds, be rotated until the distal portion of the elongated arrangement, or the distal portion of the solar panel, abuts against the elongated support. In this manner, the elongated support can hold the solar panel steadily at an angle, i.e. the same angle, as long as the wind is above a threshold value.In some embodiments, the wind-responsive solar panels can be arranged to have an angle of rotation, e.g. with respect to a vertical plane, that is non-zero as an initial position. This can e.g. be achieved by a counterweight, or the like. In some examples, the counterweight can be mounted at the end of a lever arm to bring the solar panel to the non-zero initial position. One end of the lever arm can be connected to the counterweight and the other end of the lever arm can be connected to the solar panel, the lever arm preferably extending transversally away from the elongated arrangement that includes the solar panel. As mentioned before, the initial position can sometimes be zero, which thus corresponds to that the solar panel is aligned with a vertical plane, e.g. parallel with the vertical plane.In some embodiments, the elongated support is arranged, e.g. positioned, to hold, directly at the distal portion of the elongated arrangement, or the wind-responsive solar panel, at the angle. This means for example that the wind-responsive solar panel of the elongated arrangement, or a projecting element of the elongated arrangement, leans on the elongated support, e.g. when held at the angle. The projecting element can project from an upper portion of the elongated arrangement towards the ground.A position of the elongated support can be adjusted to adjust the angle. This can for example be achieved by that ends of the elongated support are mountable at one of a respective plurality of locations at each one of the two suspension structures. Alternatively or additionally, the angle can be adjusted based on a length of the elongated support, e.g. when realized as a wire, where a longer wire decreases the angle due to parabolic shape of a hanging wire.An advantage can also be that the elongated support can be moved not to interact with the elongated arrangement and thus no longer setting the angle of the elongated arrangement. This provides a fast mechanism for activating or de-activating the angle adjustment achieved by the elongated support.In some embodiments, the elongated, flexible member can be a string, a belt, a wire, a rope, a line, a portion of a flexible layer of the wind-responsive solar panel, or the like.In some embodiments, the elongated, flexible member is electrically non-conducting.The elongated, flexible member can comprise, such as be made of, or the like, a flexible material. The flexible material can be aluminum, a flexible plastic material, fiber glass, or the like.In some examples, the solar panel suspension system is a large-scale solar park. The solar panel suspension system can then have multiple elongated arrangements, such as 3, 4, 5 or more as required by the circumstances. Further, each of said multiple elongated arrangements can then be provided with a plurality of wind-responsive solar panels.In some embodiments, the first and second elongated arrangements comprises a respective solar cell rod, or "rod" for short, that is provided with the first or second set of wind-responsive solar panels, respectively. The first and second set of wind-responsive solar panels extend, towards the ground, from a respective bottom surface of the respective rod.According to an aspect, there is provided a solar panel suspension system for suspending windresponsive solar panels. The system comprises two suspension points, e.g. at a suspension structure, and an elongated arrangement that is suspended and extends between the two suspension points. The elongated arrangement comprises the wind-responsive solar panels. The elongated arrangement is arranged to permit rotation of the wind-responsive solar panels about a rotation axis running along a main extension direction of the elongated arrangement. The system further comprises a blocking structure arranged to, e.g. only, apply its limitation of the rotation of the wind-responsive solar panels outside a rotation interval, and preferably not apply its limitation of the rotation within the rotation interval.Expressed differently, the blocking structure can be arranged to constrain the rotation of the windresponsive solar panels, e.g. only, outside the rotation interval, e.g. where the blocking structure applies, e.g. activates, limitation of the rotational motion of the wind-responsive solar panels.The blocking structure can be arranged to, e.g. only, apply its limitation of the rotation of the windresponsive solar panels outside the rotation interval.The blocking structure can be arranged to apply the limitation of the rotation outside the rotation interval.The blocking structure can be arranged to only apply the limitation outside the rotation interval. The blocking structure can be arranged to be freely rotatable within the rotation interval, e.g. freely rotatable in terms of that the limitation of the rotation by the blocking structure is not applied within the interval. Expressed differently, the blocking structure can be arranged to refrain from applying its limitation of the rotation within the rotation interval.The rotation interval can have a start angle, defining one end point of the interval, and a stop angle, defining the other end point of the interval. A reference point, at which the angle is zero, can be set at any one of the end point, or for example at a center point of the interval. The center point can then be zero, e.g. when the solar panel hangs vertically. Thus, in one example, the interval be range from -90 to 90, -85 to 85, or the like. The interval thus pertains to when the blocking structure applies no limitation, or substantially no limitation, to the rotation of the solar panel.In some examples, it can be that the blocking structure's limitation of the rotation interval is applied when the blocking structure begins to abut the solar panel.Thanks to the blocking structure fluttering and / or oscillation of the elongated arrangement, including e.g. the wind-responsive solar panel(s), can be reduced, or even eliminated. This effect can be accentuated when the wind that the system is subjected to is above a threshold value, such as 10 m / s, 15 m / s, 20 m / s, or the like. According to the embodiments herein, there is thus provided a blocking structure for limiting rotation of the wind-responsive solar panels.A purpose of at least some embodiments herein is to reduce fluttering of the wind-responsive solar panels. This can be achieved by limiting the angle of rotation of the wind-responsive solar panels. For example, the rotation can be limited when the angle of rotation exceeds e.g. 90 degrees, 85 degrees, 80 degrees, 75 degrees, 70 degrees, or the like.In some embodiments, the rotation interval is defined by that, at an end point thereof, a distal portion of the elongated arrangement abuts the blocking structure and / or that the blocking structure is arranged to begin application of the limitation of the rotation at an / the end point of the rotation interval. As an example, the blocking structure can be arranged to, at the end point(s) of the rotation interval to successively limit the rotation. This means for example that once a distal portion of the elongated arrangement abuts the blocking structure, the rotation of the solar panel may be stopped directly or may not be stopped directly. The rotation may not be directly stopped, e.g. when the blocking structure's position can be disturbed by the wind and / or by the solar panel, e.g. when the wind is sufficiently strong.In some embodiments, the blocking structure is elongated. The blocking structure is arranged along the elongated arrangement. In these embodiments, the blocking structure can comprise the elongated support. The blocking structure can be suspended between two further suspension points, e.g. at the suspension structure. The two further suspension point can be located at a distance below the initially mentioned suspension point.In some embodiments, the blocking structure is elongated. The blocking structure is arranged transversally to the elongated arrangement. The elongated arrangement comprises a longitudinal protrusion that is arranged to abut the blocking structure when the elongated arrangement is forced to the end(s) of the rotation interval. The longitudinal protrusion can extend beyond at least one solar panel in a longitudinal direction of the elongated arrangement. The blocking structure can be suspended between two additional suspension points, e.g. at the suspension structure.In some embodiments, the blocking structure can cooperate, such as abut against, or the like, the wind-responsive solar panel, such as the periphery thereof, a frame thereof, a distal portion thereof, or the like. In these embodiments, the blocking structure is separate from the elongated arrangement, but in some examples the blocking structure can include a further part that is integrated with the elongated arrangement, while the blocking structure, not including the further part, is separated from the elongated arrangement as already mentioned.In some embodiments, the system comprises a further blocking structure arranged to abut against a central portion of the elongated arrangement, when the elongated arrangement is forced to an / the end of the rotation interval. Advantageously, the elongated arrangement can have a length, e.g. in the main extension direction of the elongated arrangement that is e.g. in a range of 1 to 10 meters, 1 to 5 meters, 1 to 3 meters, or the like.In some embodiments, the system comprises an additional blocking structure. The additional blocking structure is elongated. The additional blocking structure is arranged transversally to the elongated arrangement. The elongated arrangement comprises an additional longitudinal protrusion that is arranged to abut the additional blocking structure when the elongated arrangement is forced to the end(s) of the rotation interval.In some embodiments, the additional blocking structure is located closer to the solar panel than the blocking structure as seen in a longitudinal direction. The additional longitudinal protrusion can extend beyond at least one solar panel in a longitudinal direction of the elongated arrangement. In this manner, bending, or flexing, of the solar panel can be reduced, or even avoided. In this context, it is bending refers to bending of the solar panel about a geometric axis running parallelly to the main extension direction of the elongated arrangement, but at a distance from the main extension direction.In some embodiments, the elongated arrangement comprises the blocking structure that comprises a distal, lateral protrusion extending transversally a main extension plane of the solar panels. The distal, lateral protrusion is arranged to abut an elongated suspension structure when the elongated arrangement is forced to the end of the rotation interval.In some embodiments, a distal portion of the solar panel is configured to allow longitudinal distal ends of the distal portion to be offset in relation to a central portion of the distal portion. The central portion is arranged to be offset relatively a geometric line through the longitudinal distal ends of the distal portion, when the solar panel is subjected to wind and the end of the rotation interval is reached. The distal portion can be flexible or include rigid sections as exemplified below.In some embodiments, the distal portion is flexible. The distal portion can include a bar, a rod, or the like. The distal portion can be made of a flexible material that e.g. allows the distal portion to bend, e.g. when subjected to wind, e.g. above a threshold value.In some embodiments, at least one of, preferably both, the longitudinal distal ends of the distal portion is provided with an engagement element, such as a hook, a clasp, a latch, a spike , a buckle, a fastener, a snap, a button, a loop, a magnet, a catch, a toggle, a pin, a rivet, or the like, whereby a risk of that the elongated arrangement breaks free from the blocking structure, when the distal portion flexes, is reduced.In some embodiments, the distal portion comprises one or more stiff sections, e.g. being flexibly connected to each other, e.g. with at flexible material, a joint, or the like.In some embodiments, the blocking structure is stiff and / or rigid. The blocking structure is located at a distal end of the beam. The blocking structure comprises a first portion and a second portion. The blocking structure is arranged to allow the distal portion of the solar panel to abut the first or second portion when the elongated arrangement is forced, e.g. by wind, to the respective end of the rotation interval.In some embodiments, the blocking structure comprises a flexible elongated member, such as a line, or the like, that is connected to the distal portion of the elongated arrangement and to a fixed point located below, at least along the vertical direction, the distal portion's location when not subjected to wind.In some embodiments, the blocking structure comprises a flexible elongated member that is connected to a protruding element of the elongated arrangement and to a fixed point located at a suspension structure or a beam of the solar panel suspension system.In some embodiments, e.g. when the blocking structure is elongated, the blocking structure can be a flexible elongated member, such as a wire, a line, a rope, or the like.In some embodiments, the fixed point is located at the suspension structure, such as a beam, or the like. As an example, the fixed point is located at a lower part of the suspension structure, e.g. as above below the distal portion's location, i.e. when positioned at the predefined angle.In some embodiments, the fixed point is located on the ground in the vicinity of, or in, an area beneath the solar panels.In some embodiments, the blocking structure comprises a shock absorbing material at least at portions of the blocking structure that are arranged to abut the elongated arrangement when located outside the rotation interval. Examples of a shock absorbing material include rubber, foam, gel, silicone, elastomer, neoprene, polyurethane, or the like.The expression "a blocking structure arranged to apply its limitation of the rotation of the windresponsive solar panels outside a rotation interval", and variations thereof according to the embodiments herein, can be understood as comprising two parts: 1) the embodiment relating to the elongated support, as an example of the blocking structure, and 2) embodiments relating to the blocking structure, other than the embodiment relating to the elongated support.In view of the systems where the solar panels are suspended in a manner such that the solar panels are movable in response to wind, a problem with the aforementioned known solar panel can be related to its heavy weight or the like. As described above, flexible solar panel can be a good choice when seeking light-weight solar panels, but at the expense of cost.According to another aspect, there is provided a solar panel suspension system for suspending windresponsive solar panels. The system comprises two suspension points, an elongated arrangement that is suspended and extends between the two suspension points. The elongated arrangement comprises the wind-responsive solar panels. The elongated arrangement is arranged to permit rotation of the wind-responsive solar panels about a rotation axis running along a main extension direction of the elongated arrangement, and a biasing structure arranged to bias the wind-responsive solar panel towards a predefined rotation angle. The biasing structure is arranged to apply its biasing of the wind-responsive solar panels towards the predefined rotation angle within a bias interval. Furthermore, the biasing structure is arranged to apply no or less of its biasing of the windresponsive solar panels towards the predefined rotation angle outside the bias interval.Thanks to that the biasing structure is arranged to apply its biasing of the wind-responsive solar panels towards the predefined rotation angle within the bias interval, and to apply no or less biasing of the wind-responsive solar panels towards the predefined rotation angle outside the bias interval, the predefined angle can be held, e.g. steadily by the system, even when subjected to light wind, e.g. up to a threshold value. The threshold value can be in a range of 1-6 m / s, 2-5 m / s, 2-4 m / s, or the like.In some embodiments, the biasing structure is arranged to allow the wind-responsive solar panels to rotate freely with respect to biasing applied by the biasing structure outside the bias interval. Outside the bias interval, the wind-responsive solar panels' rotation can though be limited by other factors than the biasing structure. For example, the blocking structure, biasing originating from gravity, or the like.In some embodiments, the wind-responsive solar panel is freely rotatable in at least a free rotation interval outside the bias interval. In more detail, there can be a first free rotation interval and a second free rotation interval, symmetrically located at opposite sides of the bias interval. The free rotation interval can have a length in a range of 0 degrees to 40, 50, 60, 70 degrees and start at 5, 10 degrees relatively the predefined angle. The free rotation interval is non-overlapping with the bias interval. It can here be noted that the free rotation interval is not the same as the rotation interval. In the free rotation interval, the biasing structure does not prevent, such as reduce, brake, mitigate, or the like, but the rotation is of course subjected to general resistance, such as friction, gravity, air resistance, or other practical and naturally occurring phenomena.In some embodiments, the biasing structure comprises a suspension part and a solar panel part. The suspension part can be stationary in terms of that the part is not rotatable about to the rotation axis of the solar panel part, or in a plane perpendicular to the rotation axis. The solar panel part can be rotatable. The suspension part can be arranged to be fixedly connected to at least one of the two suspension points. The solar panel part can be arranged to be fixedly connected to the solar panel(s), which is the reason for the notation "solar panel part". Clearly, the solar panel part does not have to be integrated with the solar panel, but as the solar panel rotates the solar panel part will also rotate.Thus, the suspension part can be referred to as "stationary part" and / or the solar panel part can be referred to as "rotatable part".In some embodiments, the suspension part comprises a shaft and the solar panel part comprises a holding element. These embodiments can be referred to as inverted embodiments or examples. Alternatively, in some embodiments, the suspension part comprises the holding element and the solar panel part comprises the shaft. These embodiments can be referred to as non-inverted embodiments or examples.In some embodiments, the suspension part and the solar panel part can jointly form a hinge assembly allowing the elongated arrangement 600 to be rotatable about the rotation axis, e.g. extending along the main extension direction of the elongated arrangement.The holding element is thus configured to receive the shaft, e.g. by receiving the shaft in an aperture of the holding element. The holding element can be a portion of a beam at which one of the two suspension points is located. This implies that there can be a first holding element and a second holding element, e.g. one at a respective end of the elongated arrangement.The shaft and the holding element can be configured to cooperatively apply the biasing structure's biasing of the wind-responsive solar panels towards the predefined rotation angle within the bias interval, and to apply no or less biasing of the wind-responsive solar panels (400) towards the predefined rotation angle outside the bias interval. The shaft and the holding element can implement the biasing, provided by the biasing structure, by one or more of: i) configuration of their respective shapes, ii) magnetism, iii) mechanical spring biasing. The configuration of shapes refers to that at least some overlapping cross-sections of the shaft and the holding element are configured to cooperate to achieve the bias. Biasing by magnetism refers to that one of the shaft and the holding element can be provided with a magnet and the other one of the shaft and the holding element can be provided with a magnetic material, thereby magnetism can subject the shaft and the holding element to attracting forces, which e.g. are insignificant outside the bias interval, e.g. the attracting forces are not dominating, as compared to other practically and naturally occurring phenomena, outside the bias interval. By combining a mechanical spring bias and the configuration of shapes, it can be achieved that the biasing structure is arranged to apply its biasing of the wind-responsive solar panels towards the predefined rotation angle within the bias interval, and to apply no or less biasing of the wind-responsive solar panels (400) towards the predefined rotation angle outside the bias interval. A mechanical spring bias without combination with configuration of the shapes will proportionally apply a greater and greater bias the further away from an equilibrium the solar panels are moved. Hence, with such mechanical spring bias, it is impossible to rotate the solar panels outside the spring bias's bias interval.According to some inverted embodiments, the shaft is fixedly connected and suspended between the two suspension points and the aperture is provided in the holding element fixedly connected to the solar panels.According to some non-inverted embodiments, the shaft is fixedly connected to the solar panels and the holding element is fixedly connected and suspended at one of the suspension points. At the other suspension point, there is typically a further holding element. The holding element is provided with the aperture configured to receive the shaft.In some embodiments, the biasing structure comprises a flexible blade arranged to hold the elongated arrangement at the predefined angle by abutting a surface in a cut-out into a bar end of the solar panel part. The blade can be made of any flexible material, such as metal, plastic, fiber glass, or the like. The flexible blade can be a leaf spring, a flexible elongated quadrangular sheet, single or multilayered leaf spring, a blade spring, or the like. The flexible blade can be arranged to obscure a portion of the aperture of the holding element, where said portion enables biasing within the bias interval. Outside the biasing interval, the flexible blade does not contribute to any rotation back to the predefined angle. However, the flexible blade can cause friction, which - when outside the bias interval - can be independent of the rotation angle.The bar end can be a distal portion of the shaft and / or the elongated arrangement. There can of course be a first bar end, or even a first shaft, at one end of the elongated arrangement and a second bar end, or even a second shaft, at the other end of the elongated arrangement.In some embodiments, a cross-section of the bar end has a shape of a circular segment. A chord of the circular segment runs in the surface. The circular segment can have a central angle of 180 degrees or more. The circular shape of the circular segment, i.e. the circularly shaped periphery of the circular segment, can abut the flexible blade when the solar panels are rotated to positions outside the bias interval. Within the bias interval at least one of the ends of the chord can abut the flexible blade. At the predefined angle, the chord, e.g. the entire chord or a major part of it, can abut the flexible blade. In some examples, the chord can be formed as an arc instead of a line. The arc can then have a radius that is greater than, e.g. 5, 10, or 20 times greater than, the radius of the circle depicting the cross-section of the bar end.In some embodiments, the biasing structure comprises an elongated element arranged to hold the elongated arrangement at the predefined angle by being received into an excavation of a bar end of the elongated arrangement. The elongated element, such as a rib, a blade, a bar, a strip, a plank, a beam, a rod, a plunger, or the like, can be comprised by the suspension part. The bar end with the excavation can be an example of the shaft, e.g. the shaft of the solar panel part.The excavation can run in a transversal direction relatively the main extension direction of the elongated arrangement. The excavation can merge at the surface of the bar end. The elongated element can be biased, e.g. mechanically by e.g. spring and / or magnetically, e.g. using a magnet and a magnetic material. The excavation can be a hole, a through-hole, a blind-hole, or the like.In some embodiments, the excavation comprises a v-shaped cavity, e.g. at least one cross-section of the excavation in the yz-plane is v-shaped, where e.g. a point of the v-shape is directed towards a center of the bar end.In some embodiments, the elongated element is sheet-shaped. The elongated element can have a sheet-shape, a cylindrical shape, a rectangular block shape, or the like.In some embodiments, the elongated element is biased towards the excavation by gravity, by a mechanical spring and / or by a magnet. The description herein of biasing with a magnet and a magnetic material is generally applicable throughout this disclosure.A mechanical spring can be a helical spring, a coil spring, a tension spring, a compression spring, a torsion spring, a leaf spring, a blade spring, or the like.In some embodiments, the elongated element comprises a spring plunger facing towards the excavation.In some embodiments, the holding element (770) and the shaft (790) that are arranged to cooperate to hold the wind-responsive solar panel(s) (400) at the predefined angle by that the holding element (770) and the shaft (790) have a respective cross-sectional shape that cooperates to apply their biasing of the wind-responsive solar panels (400) towards the predefined rotation angle within the bias interval, and to apply no or less biasing of the wind-responsive solar panels (400) towards the predefined rotation angle outside the bias interval. The holding element can have an aperture, such as a through-hole, a blind hole, or the like. The shaft can be a bar, a stick, a rod, a spindle, an axle, a pole, a beam, or the like. The aperture is formed by inner surfaces of the holding element.In some embodiments, the holding element, e.g. provided with the aperture, is fixedly connected at at least one of the suspension points, and the shaft is fixedly connected to the solar panels.In some embodiments, the holding element has an inner surface forming the aperture configured to receive the shaft. At least a portion of the inner surface can be elastically flexible. Said at least a portion of the inner surface can be provided by means of one or more, preferably two, blade springs, or the like.In some embodiments, the blocking structure comprises a magnet and a magnetic material. The magnetic material can be a further magnet, i.e. there can be a first magnet and a second magnet. The holding element can include the magnet and the shaft can include the magnetic material.Alternatively, the holding element can include the magnetic material and the shaft can include the magnet. When the magnetic material is the further magnet, such further magnet shall have opposite polarity towards the magnet to achieve magnetic attraction therebetween.In some embodiments, a plate of the elongated arrangement is arranged for suspension thereof at one of the two suspension points. The plate comprises the magnet or the magnetic material.The plate can be an example of the holding element.In some embodiments, an end of the elongated arrangement, receivable by the plate, comprises the magnet, or the magnetic material. The end of the elongated arrangement can be an example of the shaft, the bar end, or the like.In some embodiments, the shaft has a cross-section, e.g. in the yz-plane, comprising a circular primary part and a secondary part forming an indentation extending from a circle defining the primary part towards a center of the circle, and wherein the holding element has a cross-section, e.g. in the yz-plane, comprising a circular primary portion and a secondary projection formed between two depressions, wherein the two depressions extend outside a circle of the circular primary portion.In some embodiments, the indentation of the secondary part is configured to receive the secondary projection.In some embodiments, the circle of the primary portion has a diameter that corresponds to a diameter of the circle defining the primary part.In some embodiments, the system comprises the blocking structure according to any one of the examples and / or embodiment herein.The bias interval is overlapping with the rotation interval. The bias interval can be symmetrically located in the rotation interval, e.g. such that the middle points of the bias and the rotation interval coincide.Figure 1, Figure 2, Figure 3, Figure 4, Figure 5 and Figure 6 are views illustrating examples of the solar panel suspension system according to some embodiments herein.Figure 7 and Figure 8 are perspective views illustrating some examples of the system herein.Figure 9a and Figure 9b are perspective views illustrating examples of the system, in which the solar panel can be blocked by a blocking structure, e.g. at an angle, such as when winds are strong enough.Figure 10 is schematic detailed view of how a lower wire can be arranged in relation to the elongated arrangement having wind-responsive solar panels.Figure 11 is a perspective view illustrating the elongated arrangement's connection to a suspension point, e.g. of a suspension structure.Figure 12a and Figure 12b are perspective views illustrating examples in which the elongated arrangement is stiff and / or rigid. These examples can be combined with any one or more of the other embodiments herein.Figure 13a, Figure 13b, Figure 14, Figure 15a, Figure 15b, Figure 16 and Figure 17a, Figure 17b are views illustrating examples of the angle aspect according to some embodiments herein.Figure 18 and Figure 19 are views illustrating examples of the rotation aspect according to some embodiments herein.Figure 20 is a side view illustrating an example of the elongated arrangement according to some embodiments herein.Figure 21 and Figure 22 are views illustrating examples of the solar panel suspension system.Figure 23a and Figure 23b are views illustrating further examples of the solar panel suspension system.Figure 24 illustrates further examples of the blocking structure.Figure 25a is a perspective view, illustrating still further examples of the blocking structure.Figure 25b is a perspective view, illustrating still further examples of the blocking structure.Figure 26 is a simplified overview of the rotation interval.Figure 27 is a perspective view of yet another example of the blocking structure.Figure 28 is a side view of the preceding example of the blocking structure.Figure 29 is a perspective view illustrating an example of the elongated arrangement, which can be combined with any one or more of the examples of the blocking structure and / or the biasing structure herein.Figure 30 is a perspective view illustrating a further example according to the embodiments herein.Figure 31 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 32 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 33 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 34 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 35 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 36 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 37 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 38 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 39 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 40 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 41 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 42 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 43 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 44 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 45 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 46 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 47 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 48 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 49 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 50 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 51 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 52 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 53 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 54 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 55 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 56 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 57 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 58 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 59 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 60 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 61 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 62 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 63 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.Figure 64 is a view illustrating an example of the biasing structure, which can be combined with any other example(s) herein, when reasonably possible.DETAILED DESCRIPTIONThroughout the present disclosure, the following terms and definition may be used.As used herein, a solar cell, aka a photovoltaic cell, is capable of generating electricity when illuminated by light. Solar cells are commonly available on the market, such as crystalline solar cells, mono crystalline solar cells, poly crystalline solar cells, thin-film solar cells, or the like.As used herein, the terms wire, rope, conducting or non-conducting line, string, band, belt may have been used interchangeably.As used herein, the term "solar panel" refers to a panel comprising one or more photovoltaic cells, aka solar cells.As used herein, the terms "first direction", "second direction" and "third direction" have been used to refer to an x-axis, e.g. width, a y-axis, e.g. height, and a z-axis, e.g. depth, of a first coordinate system aligned with the exemplifying solar panel suspension systems disclosed herein. Similarly, a first plane refers to the xy-plane XY of the first coordinate system, a second plane refers to the yz-plane YZ of the first coordinate system and a third plane refers to the xz-plane XZ of the first coordinate system. For ease of understanding, it is herein described as that the coordinate system related to various examples illustrated in the Figures are aligned, but it is evident that when considering e.g. only the solar panel, the planes and directions of the solar panel are independent of other coordinate systems, such as directions and planes of the first coordinate system. A few examples include, but are not limited to, that the first plane XY can be a main extension plane of the solar panel and / or the elongated arrangement including solar panels, the first direction X can be a main elongation direction of the elongated arrangement, the second direction Y can be a main elongation direction of a beam, e.g. a vertical beam, the third direction Z can be a main elongation direction of an elongated suspension structure, and the like.The term "wind-responsive solar panel" refers to a solar panel that is capable of moving in response to wind, e.g. due to a particular design thereof or due to being connected to a particular mounting construction enabling movement in response to wind. Generally, a wind-responsive solar panel can be any sheet or layer provided with solar cells, where the sheet or layer is mounted in such a way that the sheet or layer can rotate in response to wind, e.g. wind that is strong enough to move the sheet or layer. The wind-responsive solar panel can be a flexible solar panel, such as a thin-film solar panel, a light-weight thin and flexible solar panel, a conventional non-flexible panel connected to a mounting construction enabling movement in response to wind, or the like, as described herein. That is to say, in some embodiments a conventional solar panel can be used. The wind-responsive solar panel can be light-weight in order to allow wind to tilt, rotate, bend and / or flex the wind-responsive solar panel. This means that the wind-responsive solar panel can be flexible and / or bendable.Flowever, in some examples it can be sufficient that the wind-response solar panel is rotatably mounted and / or mounted with hinges to allow the panel to move when subjected to wind, e.g. sufficiently strong winds. Flence, the wind-responsive solar panel can be arranged to be pivotably and / or rotatably connected, e.g. mechanically connected, to a mounting system, e.g. in a mounting edge of the wind-responsive solar panel. In some examples, solar cells of said one or more respective wind-responsive solar panels can rotate and / or flex, in response to wind, e.g. about one or more rotation axes, which can extend along a main elongated direction X of the respective solar cell rod. The wind-responsive solar panel can be electrically connected, e.g. via the mounting edge or directly, to one or more further wind-responsive solar panels.The term "elongated arrangement", or "set of wind-responsive solar panels interconnected, e.g. mechanically and / or electrically, to form an elongated, flexible arrangement", refers to a set of windresponsive solar panels that are arranged and aligned along a geometric axis, e.g. in the first direction X. The elongated arrangement can be realized according to known manners or it can be realized as described according to various embodiments herein.As used herein, the term "subjected to wind" refers to that the wind is actively affecting or interacting with e.g. a solar panel in some way, e.g. causing the solar panel to move from one position to another, e.g. holding the solar panel against a blocking structure, or the like. As an example, the wind can be above a threshold value in order to be able to significantly move and / or rotate the solar panel. Furthermore, when the solar panel is subjected to no wind, it can mean that the wind is below a threshold value. Generally, when wind is discussed wind speed, such as average wind speed, can be intended, in particular in relation to thresholds, such as threshold values, limits, limit values or the like.As used herein, "distal" generally refers to a portion of an element that is located away from the element's connection point or its center point, depending on context. E.g. a distal end of a beam can refer to the end of the beam that is not connected, or to any one of the ends of the beam if the beam is connected in both ends or if the beam is connected at a middle portion thereof. In case, a unit is connected to allow rotation about a longitudinal axis, then distal refers to parts of the unit that are at a distance, or furthest away from, or almost furthest away from, the rotation axis. One example of such unit can be the elongated arrangement.According to some examples of the elongated arrangement, wind-responsive solar panels are arranged to hang from a wire, or a bar, that extends along the entire length of the elongated arrangement. The bar can be realized by an example of the solar cell rod disclosed herein.In some examples, the elongated arrangement comprises at least two solar cell rods according to embodiments herein. With these examples, one or more respective wind-responsive solar panels are mounted to a respective one of said at least two solar cell rods. Each one of said at least two solar cell rods is connected, e.g. mechanically connected, to at least one other solar cell rod using at least one respective interconnecting line. This means that each solar cell rod connects to its neighboring solar cell rod, which can be one neighbor or two neighbors. The elongated arrangement thus forms a chain-line structure of interconnected solar cell rods, where each solar cell rod hold at least one wind-responsive solar panel. The wind-responsive solar panel is described above.The expression "extend between A and B" can, in some examples, can refer to that a features, such as a line, rod, or the like, extends all the way from A to B, B to A or the like.According to at least some embodiments herein, the solar panel suspension system provides at least two suspension points, sometimes at least four suspension points. A pair of suspension points can be used to suspend e.g. the elongated arrangement that can be directly or indirectly mechanically connected between the pair of suspension points. Generally, one or more suspension point can be located at a suspension structure, such as a distal end of a beam, or the like. Notably, two suspension points can be located at different locations on a horizonal bar. Accordingly, two suspension points need not necessarily belong to e.g. different beams, even though the suspension points can belong to different beams.Figure 1 shows an example of a solar panel suspension system 100 according to at least some embodiments herein. The solar panel suspension system 100 comprises two vertically, e.g. substantially vertically, mounted beams 105. The solar panel suspension system 100 can accordingly mount, such as suspend, or the like, one or more wind-responsive solar panels 400 to allow light incident thereon to be converted to electricity.Each beam 105 is connected, directly or indirectly, to ground. In this manner, said each beam 105 can be steadily secured in its position, e.g. in an upright position. This can mean that a main extension direction of said each beam 105 is vertical, such as substantially vertical. Furthermore, said each beam 105 is arranged to provide a respective suspension point 110, e.g. at a distal end 109 thereof. At least one elongated arrangement 600 can be suspended between two such respective suspension points 110, or suspension structures. The suspension structures can be part of the distal end of said each beam 105. The distal end 109 can comprise a suspension point, i.e. such suspension point 110.In some examples, Figure 1 shows an exemplifying solar panel suspension system 100 for suspending wind-responsive solar panels 400 above ground, thereby making the ground available. The ground can be made available for example by that the wind-responsive solar panels are suspended at least 2 m, 3 m, 4 m, 5 m, 10 m, 20 m, 30 m, or the like, above the ground and / or by that a lowest part of the wind-responsive solar panels is at least at least 2 m, 3 m, 4 m, 5 m, 10 m, 20 m, 30 m, or the like, above the ground.The solar panel system 100 comprises two suspension structures 130 indirectly connected to the ground and located at a distance from the ground, and an elongated arrangement 600 for mounting of the wind-responsive solar panels 400. The elongated arrangement 600 is suspended and extends between the two suspension structures 130.Figure 3 shows an example in which the solar panel suspension system 100 includes a number of elongated arrangements 600 that are arranged vertically above each other. In this manner, each elongated arrangement 600 is held at its respective height over ground.Figure 4 shows a further example, illustrating that the two beams 105 can be connected to each other and then a further beam 103 connects the two beams 105 to ground. This is an example of that the two beams 105 are indirectly connected to the ground.Figure 5 is a variation of the embodiment according to Figure 4 and / or Figure 6 below.Figure 6 is another example of a solar panel suspension system 100. The solar panel suspension system 100 comprises four beams 105. Each beam 105 of the four beams 105 is located at a respective corner of a rectangle. The four beams 105 can describe a 10 by 20 meters rectangle or the like.In some examples, the solar panel suspension system 100 can be provided with a spacing bar 135, that can be arranged perpendicularly to multiple elongated arrangements 600 mounted in parallel. Each elongated arrangement 600 can thus be connected to, such as attached, fixed, or the like, the spacing bar 135. As a result, the spacing bar 135 ensures that the distance between the elongated arrangements 600 remain constant, or almost constant. This can mean that the distance between two elongated arrangements 600 is constant, e.g. along a main extension direction of the two elongated arrangements 600.Generally, the hosting bar 130 and the spacing bar 135 can be provided with holes, such as throughbores, inserts, holding units or the like, for fastening of various details herein. The various details herein can refer to one or more of interconnecting line(s), solar cell rod(s), support wire(s) or the like.The spacing bar 135 can be made of plastic, or other suitable material for providing rigidness and / or stiffness to the bar(s).Generally, a beam length of the beams 105 can be between 2 to 10 meters, 4 to 6 meters, or the like. The beam length is dependent on how high above ground some lowest part of the wind-responsive solar panel 400 is allowed to be. Other beam lengths than those mentioned above can therefore also be applicable in some examples. A distance between two beams 105 can be 10 to 50 meters, 20 to 40 meters, or about 30 meters.In general, the beams 105 can be made of wood, metal, plastic or other common materials used for building beams. The beams can be built using truss, frameworks, cylinders or the like. The beams 105 can be stiff and / or rigid, thereby avoiding, or reducing, flexing thereof.Furthermore, with the solar panel suspension systems 100 herein, the panels are sometimes suspended high enough, see example above, not to be impacted by roaming animals, people, growing vegetation etc. with an added benefit that the ground under the wind-responsive solar panels 400 is made available for use, such as agricultural use, use for motorways, and / or the like.At least some examples of the solar panel suspension system 100 described herein can be electrically connected to a load (not shown), such as an energy storage system, a battery system, a battery, a motor, an engine, a machine, an electrical grid or the like. The motor etc. can be used for any suitable purpose, such as air conditioning, ventilation, manufacturing, or more.It shall here be noted that Figure 6 illustrates an example where different aspects of the systems have been combined, while each aspect can also be applied separately to this or other examples herein. Accordingly, the system 100 of Figure 6 can also be realized while applying only one of the aspects, or any number of the aspects.In some examples, Figure 6 shows an example of a solar panel suspension system 100 for suspending wind-responsive solar panels 400 above ground, thereby making the ground available.The solar panel suspension system 100 comprises two elongated suspension structures 130 directly or indirectly connected to the ground and located at a distance from the ground. Moreover, the solar panel suspension system 100 comprises a first elongated arrangement 600 and a second elongated arrangement 600. The first elongated arrangement 600 comprises a first set of the wind-responsive solar panels 400, that can represent a first row of wind-responsive solar panels. The second elongated arrangement 600 comprises a second set of the wind-responsive solar panels 400, that can represent a second row. The first and second sets of wind-responsive solar panels 400 do not include the same wind-responsive solar panels, i.e. any wind-responsive solar panel 400 cannot be included in both the first and second sets of wind-responsive solar panels. This means for example the first and second sets are different, non-overlapping, etc. Consequently, both the first and the second sets of wind-responsive solar panels 400 are so called proper subsets of the wind-responsive solar panels 400 included in, such as mounted by, held by or the like, the system 100.The first and second elongated arrangements 600 run transversally to the two elongated suspension structures 130, wherein each one of the first and second elongated arrangements 600 is suspended and extends between the two elongated suspension structures 130, wherein the first and second elongated arrangements 600 run alongside each other e.g. without crossing each other.With reference to Figure 9a / 9b through Figure 19 and Figure 21 through Figure 25a / 25b, there are shown various examples of the solar panel suspension system 100 in which the angle of rotation is limited. These examples can be combined with any one or more of the exemplifying solar panel suspension systems 100 disclosed herein.Figure 9a shows a detailed view of a wind-responsive solar panel 400 mountable in any example or embodiment of the solar panel suspension system 100 herein. In the examples of Figure 9a and Figure 10, the wind-responsive solar panel 400 is held at an angle, e.g. defined in a plane perpendicular to the first direction X. Thanks to the angle, more of the light incident on a surface of the wind-responsive solar panel can be converted into electricity, e.g. due to that a smaller portion of the light will be reflected at the surface of the wind-responsive solar panel 400. This means that a greater portion of the light will eventually reach a photovoltaic cell of the wind-responsive solar panel 400. As a result, efficiency of the solar panel suspension system 100 is increased.Even when the wind-responsive solar panel(s) are held at the angle, wind can cause the windresponsive solar panel to move, yet somewhat stronger wind may be required as compared to when the wind-responsive solar panel hangs completely free. In this regard, it deserves to be noted that the wind-responsive solar panel also when held at the angle is movable due to wind. Further, when held at the angle the wind-responsive solar panel still extends towards the ground, yet its main direction plane being at the angle with respect to a vertical plane.According to various examples herein, the solar panel suspension system 100 can thus allow the angle of the wind-responsive solar panel, such as a flexible solar panel, or the like, to be adjusted. This can be achieved by providing the solar panel suspension system 100 with an elongated support 140, which can be parallel with, or substantially parallel with, the main extension direction X of the elongated arrangement 600, such as the solar cell rod(s) 500, or the like. Generally, the elongated support 140 can be realized as a support wire, a support beam, a support bar or the like.In these examples, the elongated support 140, such as a support line, a support bar or the like, can be suspended along the first direction X, e.g. along the solar panel's 200 main extension direction. This means that the solar panel suspension system 100 can include the elongated support 140. The elongated support 140 has two ends, which can be provided, e.g. fastened in or the like, at a respective beam 105, or the like. As an example, albeit not shown, it can be that the suspension structure is arranged to hold, such as fasten, or the like, the suspension line at a first point on the suspension structure. Further, the suspension structure can be arranged to hold, such as fasten or the like, the elongated support at a second point on the suspension structure. The first point can be located further away from the ground than the second point. A distance between the first and second points can correspond to a length of the wind-responsive solar panel, e.g. along the second direction Y. Accordingly, the distance can be the same as the distance, slightly more or slightly less than the distance depending on implementation. The distance can be less than 1.5 times said length of the wind-responsive solar panel 400.In Figure 9a, Figure 9b and Figure 10, the solar panel suspension system 100 is arranged to provide the elongated support 140 within reach of the wind-responsive solar panel 400, e.g. when the windresponsive solar panel 400 swings due to wind or otherwise. Thereby, the wind-responsive solar panel 400 can be prevented from assuming its natural, vertical position at rest. This means for example that the elongated support 140 prevents the wind-responsive solar panel 400 to hang vertically due to its gravity, e.g. as long as a distal portion of the wind-responsive solar panel 400 rests on the elongated support 140, e.g. lays on top of the elongated support 140. Flowever, the elongated support 140 can also be used to limit the rotation of the wind-responsive solar panel outside a rotation interval. The elongated support 140 is thus an example of the blocking structure.In some examples relating to Figure 9a, Figure 9b and Figure 10, the wind-responsive solar panel 400 can be stopped from rotating more than to a particular rotation angle, if initially positioned e.g. in a vertical resting position. In this manner, the wind-responsive solar panel 400, or the elongated arrangement 600, can be held steadily at the particular rotation angle, when the wind has a wind speed above a threshold value. Accordingly, while it has been observed that strong winds can cause turbulent and / or irregular movement of the wind-responsive solar panel 400, it has been realized that the construction according to Figure 9a can be applied as in Figure 9b. Figure 10 illustrates that the elongated arrangement 600 rests on the elongated support 140. It is, however, clear that the corresponding abutment between the distal portion 460 and the elongated support 140 can occur when the wind blows at the wind-responsive solar panel 400, if initially being in e.g. a vertical resting position. The corresponding abutment can refer to that the distal port 460 abuts the elongate support 140 from below.Expressed differently, in some embodiments, the blocking structure 700 is elongated. The blocking structure 700 is arranged along the elongated arrangement 600. The blocking structure can be suspended between two further suspension points, e.g. at the suspension structure. The two further suspension point can be located at a distance below the initially mentioned suspension point.In this manner, the wind-responsive solar panel 400 moves due to the wind within the rotation interval. But outside the rotation interval, further rotation is limited by the elongated support 140. As a result, the solar cells are not exposed to harmful fluttering and / or vibration which could cause malfunction, or failure, in the wind-responsive solar panel 400.Given that the solar panel suspension system 100 is arranged to allow the wind-responsive solar panels 400, e.g. belonging to the elongated arrangement 600 or the like, to swing about a rotation axis R, that runs in parallel with the first direction X, a first distance between the rotation axis R and the elongated support 140 can be less than a second distance between the rotation axis R and the distal portion 460 of the wind-responsive solar panel 400.With reference to Figure 9a / 9b through Figure 25a / 25b, various examples of how the solar panels 400 can be prevented from rotating more than up to a particular rotation angle, e.g. in a vertical plane that is perpendicular the rotation axis R of the solar panels 400. The particular angle can be measured from a horizontal plane or from a vertical plane. Beyond the particular angle the blocking structure limits the rotation, e.g. outside the rotation interval.In order to achieve that the rotation is constrained to the particular angle, the system 100 is provided with a blocking structure 700 that can stop the rotation of the elongated arrangement 600 and / or the wind-responsive solar panels, which can hang freely in e.g. two suspension point of the system 100. Accordingly, the blocking structure is arranged to apply its limitation of the rotation of the windresponsive solar panels 400 outside the rotation interval. As an example, the rotation of the solar panel(s) can be constrained, such as limited, confined, or the like, to a rotation interval. The rotation interval can preferably be twice the particular angle, such as two multiplied by the particular angle.With the embodiments including the blocking structure 700, there is provided a solar panel suspension system 100 for suspending wind-responsive solar panels 400. The system 100 comprises two suspension points 110, e.g. at a suspension structure, and an elongated arrangement 600 that is suspended and extends between the two suspension points 110. The elongated arrangement 600 comprises the wind-responsive solar panels 400. The elongated arrangement 600 is arranged to permit rotation of the wind-responsive solar panels 400 about a rotation axis R running along a main extension direction of the elongated arrangement 600, i.e. in the direction of the x-axis.Moreover, the system 100 comprises a blocking structure 700, 701, 702, 710, 711, 712, 730, 731, 732, 140 arranged to, e.g. only, apply its limitation of the rotation of the wind-responsive solar panels 400 outside a rotation interval, and preferably not apply its limitation of the rotation within the rotation interval.Generally, the blocking structure according to the examples herein is arranged at a position, e.g. in space e.g. in the vicinity of the solar panel, to hold and / or abut a distal portion of the elongated arrangement (600), e.g. a distal end / edge of the solar panel, when the wind-responsive solar panels (400) are subjected to wind, e.g. above a threshold value.In some examples, it may be that the blocking structure 700, 701, 702, 710, 711, 712, 730, 731, 732, 140 is arranged to stop, or at least limit, rotation of the wind-responsive solar panels (400), when subjected to wind, e.g. above a threshold value, at a rotation angle (801) relatively a rest angle (802) in which the wind-responsive solar panels (400) are located at rest, e.g. when subjected to wind below a further threshold value.In some examples, the blocking structure limits the elongated arrangement's 600, the windresponsive solar panel's, or the like, freedom of rotational movement.In aforementioned Figure 9a and Figure 9b, the elongated support 140 is an example of the blocking structure. Then, this means that the distal portion 460, 610 of wind-responsive solar panel 400 and / or the elongated arrangement 600 can abut the elongated support 140 when the windresponsive solar panel 400 and / or the elongated arrangement 600 is at one of the end points of the rotation interval. The elongated support 140 is thus arranged to stop the rotation at the rotation angle when the distal portion 460, 610 portion abuts the elongated support 140.In some embodiments, the rotation interval is defined by that, at an end point thereof, a distal portion of the elongated arrangement 600 abuts the blocking structure 700 and / or that the blocking structure 700 is arranged to begin application of the limitation of the rotation at an / the end point of the rotation interval. The limitation can thus imply that the rotation of the elongated arrangement 600, or the solar panel, can slow down, from or after the end point of the rotation interval, up to a limit, e.g. at which the solar panel stops rotating.With the embodiments, in which the rotation angle is limited, it may be that the angle, at which limitation of the rotation can be applied, is in a range from 45 to 90 degrees, 60 to 90 degrees, or 70 to 85 degrees, e.g. with respect to a vertical plane. Consequently, an interval, corresponding to the angle, can be twice as large due to that the panel typically can rotate symmetrically away from a vertical plane. In some examples, the panel can rotate non-symmetrically.In Figure 11, there is a detailed view illustrating that the system 100 can include a blocking structure 700, e.g. realized as an elongated blocking structure, such as a beam, a bar, a wire, a line, a string, or the like. The elongated blocking structure 700, 701 can be suspended at a plate 770 connected to the suspension structure 130. The plate 770 can be comprised in, e.g. a part of, the elongated arrangement 600. The plate 770 can thus be arranged to rotatably mount and suspend one end of the elongated arrangement 600 to one of the suspension points 110, e.g. of the suspension structure 130. The examples of Figure 11 can be combined with any one or more of the embodiments herein, when applicable. Thanks to the plate 770 a consistent distance between the elongated blocking structure 700, 701 can be achieved. The distance can be constant, or almost constant, along the extension direction of the blocking structure 700, 701 and the elongated suspension structure 130.In Figure 12a, the blocking structure 700 is realized by the elongated blocking structure 701 that interacts with a longitudinal protrusion 711 of the solar panel 400. The longitudinal protrusion (11) can be part of a stiff structure running along a lower periphery of the solar panel 400. It is desired that the longitudinal protrusion 711, 712 extends beyond the solar panel 400 as seen along the longitudinal direction, such as the x-axis, of the solar panel 400.Figure 12b is provided to illustrate that the elongated arrangement 600 can swing, or rotate, either clockwise or counter-clockwise, preferably while the solar panels pass under an upper portion of the elongated arrangement 600. The fact that the elongated arrangement 600 can swing back and forth in this manner is applicable to some, unless not to all, embodiment herein.In the examples of Figure 12a and Figure 12b, the blocking structure 700 is elongated, i.e. the blocking structure can be a wire, or the like. The blocking structure 700 is arranged transversally to the elongated arrangement 600. The elongated arrangement 600 comprises a longitudinal protrusion 711, 712 that is arranged to abut the blocking structure 700 when the elongated arrangement 600 is forced to the ends of the rotation interval. The longitudinal protrusion can extend beyond at least one solar panel in a longitudinal direction of the elongated arrangement. The blocking structure can be suspended between two additional suspension points, e.g. at the suspension structure.Figure 13a illustrates an example of the system 100, in which the blocking structure 700 is suspended along the respective wire 130. The blocking structure 700 is suspended at respective points of the suspension structure located below suspension points of the respective wire 130.Figure 13b illustrates further examples of the system 100, in which the wind-responsive solar panel and / or the elongated arrangement 600 is provided with one or more openings 745, such as slots, slits, through-holes, or the like. The openings 745, i.e. the cross-section thereof in the xy-plane, can have various shapes, such as elongated, elliptical, rectangular, or the like. The elongated blocking structure 700 can pass through the openings 745, such as a respective opening in case there are several elongated blocking structures 700. In this fashion, as the wind cause the elongated arrangement 600 to rotate, an inner lower portion of the opening 745 abuts the blocking structure 700, whereby the rotation is limited outside the rotation interval.Figure 14 shows another example of when the blocking structure 701 is arranged transversally with respect to the main extension direction of the elongated arrangement 600. In this example, the windresponsive solar panel 400 is not subjected to wind, or wind that is less than a threshold value. In contrast thereto, Figure 15a shows the wind-responsive solar panel 400 when subjected to wind, e.g. wind that is greater than a threshold value. In this case, the longitudinal protrusion 711, 712 abuts the blocking structure, e.g. at least a portion of the blocking structure.Turning back to Figure 13a, the system 100 can further include a further blocking structure 703, such as a wire, that is suspended between a respective longitudinal support structure 741, 742. The respective longitudinal support structure 741, 742 can be a stiff beam, a wire, or the like. The respective longitudinal support structure 741, 742 extends between two distal portions of a respective beam 105. The further blocking structure 703 can be arranged in level with, e.g. in vertical level with, the blocking structure 701, 702. In some examples, the further blocking structure 703 can be arranged above, e.g. slightly above, i.e. when considering the distance from the ground, the blocking structure 701, 702. This can be beneficial when the distal portion of the solar panel 400 is flexible, i.e. it can bend such that - with reference to Figure 15a, the longitudinal protrusions 711, 712 are located closer to ground than a central portion of the distal edge 610 of the elongated arrangement. This thus applies when the elongated arrangement 600 is subjected to wind above the threshold value, i.e. sufficiently to bend said distal portion 610.Figure 15b reveals that, in some examples, the distal portion 610 of the elongated arrangement 600 can be provided with an engagement element 781, 782, such as a hook, a clasp, a latch, a spike, a buckle, a fastener, a snap, a button, a loop, a magnet, a catch, a toggle, a pin, a rivet, or the like. This example can be combined with any one or more of the examples herein. Thus, in some embodiments, at least one of, preferably both, the longitudinal distal ends of the distal portion is provided with an engagement element 781, 782, whereby a risk of that the elongated arrangement breaks free from the blocking structure 700, when the distal portion 610 flexes, is reduced.Figure 16 illustrates an example of the system 100, in which the system 100 is subjected to no or little wind to the left in Figure 16 and in which the system 100 is subjected to wind or strong wind to the right in Figure 16. In this example, the system 100 comprises the further blocking structure 703, which can be suspended as shown in Figure 13a, or in another similar manner. Thanks to the further blocking structure 703, a length of the elongated arrangement 600 can be longer, e.g. than without the further blocking structure 703. The further blocking structure 703 provides a beneficial support to a central portion of the elongated arrangement 600, which thus can withstand greater stress, e.g. due to wind, or the like. The further blocking structure 700, 703 can be arranged to abut a central portion 713 of the elongated arrangement 600, when the elongated arrangement 600 is forced to one of the ends of the rotation interval. In order to achieve that the central, and preferably distal, portion of the elongated arrangement 600 can be arranged to abut the further blocking structure 703, the solar panel can be provided with a through-hole, such as a slot, or the like. The further blocking structure 703 can be arranged to run through the through-hole, e.g. irrespectively of the rotation angle of the solar panel.In Figure 17a, there is shown another example of the system 100, in which the system 100 comprises an additional blocking structure 704. The additional blocking structure (704) is elongated. The additional blocking structure 704 is arranged transversally to the elongated arrangement 600. The elongated arrangement 600 comprises an additional longitudinal protrusion 721, 722 that is arranged to abut the additional blocking structure 704 when the elongated arrangement (600) is forced to the end(s) of the rotation interval. The additional blocking structure 704 can be located closer to the solar panel 400 than the blocking structure 701 as seen in a longitudinal direction.Thanks to the additional blocking structure 704, bending of the solar panels of the elongated arrangement 600 can be reduced. As seen in Figure 17a, it has been realized that the solar panels may bend when further rotation of the solar panel is limited, or stopped, by the blocking structure 701, but the wind continues to push on the solar panel. Such pushing by the wind would cause the solar panel to bend about a geometric axis that is parallel with the main extension direction of the elongated arrangement and e.g. runs below the additional blocking structure 704.The additional longitudinal protrusion 721, 722 can extend beyond at least one solar panel in a longitudinal direction of the elongated arrangement, but the additional longitudinal protrusion 721, 722 extends shorter away from the solar panel than the longitudinal protrusion 711, 712.In a further example of the system 100, when subjected to no wind in Figure 18 and when subjected to wind in Figure 19, the rotation of the solar panel 400 can be achieved by a blocking structure 730 that is included in the elongated arrangement 600, such as the solar panel, e.g. the distal end of the solar panel, or the like. The blocking structure can then comprise a distal, lateral protrusion 731, 732 extending transversally a main extension plane of the solar panels 400. The distal, lateral protrusion 730, 731, 732 is arranged to abut an elongated suspension structure 130, when the elongated arrangement 600 is forced to the end of the rotation interval. In some examples, the system 100 can provided with an additional wire 701, 702, e.g. as shown in Figure 16. Then, the distal, lateral protrusion 731, 732 can be arranged to abut the additional wire 701, 702 when the elongated arrangement 600 is forced to the end of the rotation interval. Advantageously, an upper surface of the distal, lateral protrusion 731, 732 can be provided with a mirror. In the manner, the distal, lateral protrusion 731, 732 acts as both a blocking structure and a mirror for improving efficiency of the solar panel system 100.Figure 21 and Figure 22 shows an example in which the solar panel 400 comprises at least two sections. In this example, three sections are shown. As before, Figure 21 shows the system 100 with no wind and Figure 22 shows the system 100 when subjected to wind. Accordingly, in some embodiments, a distal portion of the solar panel 400 is configured to allow longitudinal distal ends of the distal portion to be offset in relation to a central portion of the distal portion. The central portion is arranged to be offset relatively a geometric line through the longitudinal distal ends of the distal portion, when the solar panel 400 is subjected to wind and the end of the rotation interval is reached. In these embodiments, optionally in combination with any one or more other embodiments herein, the solar panel can be section or flexible in order to enable the offset of the central portion.In some embodiments, the distal portion is flexible. In some embodiments, the distal portion comprises one or more stiff sections, e.g. being flexibly connected to each other, e.g. with at flexible material, a joint, or the like.Figure 23a shows an example of the system 100 in which the blocking structure is stiff and / or rigid, such as a beam, bar, rod, or the like. The blocking structure 750 can include a first bar and a second bar, having a first portion 751 and a second portion 752, at a respective end thereof. The other ends of the first and second bar can be fixedly connected to each other.The first and second portions 751, 752 are arranged such that the distal portion of the elongated arrangement 600 abuts one of the first and second portions 751, 752, when the elongated arrangement 600 is forced to any one of the ends of the rotation interval. Expressed differently, the blocking structure 750 can be arranged to allow the distal portion of the solar panel to abut the first or second portion 751, 752, when the elongated arrangement 600 is forced, e.g. by wind, to the respective end of the rotation interval. Notably, the solar panel need not necessarily be provided with the longitudinal protrusion 711, 712 (see left corner of the wind-responsive solar panel). The first and / or second portion 751, 752 can abut a respective distal corner of the elongated arrangement 600, e.g. a respective distal corner of the solar panel. Here, distal is relatively the rotation axis and a center of the elongated arrangement and / or the solar panel. As shown to the left in the Figure, the second portion 752 can abut directly onto the solar panel which does not need to have any longitudinal protrusion 711, 712.The shape of the blocking structure 750 can vary to some extent, but the blocking structure 750 can preferably be configured to provide the first and second portions 751, 752 to achieve constrained rotational movement of the solar panel to the rotational interval, e.g. as mentioned by abutment on the distal portion of the elongated arrangement 600. The blocking structure 750 can have the shape of a straight beam, the shape of an upside-down letter "v", a combination thereof, or the like.In some examples, the distal portion of the elongated arrangement 600 is provided with a longitudinal protrusion 711, 712 as mentioned above. Similarly as before, the longitudinal protrusion can interact with, such as abut, or the like, the first and second portions 751, 752 when the ends of the rotational interval is reached.Figure 23b is a perspective view, illustrating that at least portions of the blocking structure 701, 702, such as a wire, or the like, can run askew with respect to a transversal direction to the elongated arrangement 600. In this manner, limitation of the rotational freedom of the solar panels can be achieved by that the distal corners of the solar panel abuts the blocking structure 701, 702. The distal corners are distal with respect to a center of the solar panel and with respect to the rotation axis of the elongated arrangement 600. It can be that the distal corners are provided with the engagement elements 781, 782 as described above. In order to achieve that the blocking structure runs askew, a holder 785 can be provided. The holder 785 can be connected between two blocking structures, such as wires, or the like, whereby by the blocking structures are arranged to become askew. The holder 785 can be a connector, a bar, a wire, or the like. A length of the holder 785 is adapted based on desired angle of the askew blocking structure, or at least the askew parts of the blocking structure 700. An advantage can be that blocking becomes possible without the need for e.g. the 711, 712 or similar as the blocking structure can abut the distal corners of the elongated arrangement 600 when the end of the rotation interval is reached, e.g. due to wind.In some examples, there can be more than one holder 785, e.g. a first holder 785 and a second holder 785. The holders 785 can have the same or different lengths.The blocking structure 700 can be mounted at the beam 105, e.g. at a suspension point 786. In some examples, the blocking structure 700 can be fastened as shown in Figure 11. In general, it can be preferred that the blocking structure 700 is fastened below the rotation axis and below e.g. the suspension points of the suspension structure in which the elongated arrangement 600 is suspended.In some examples, the system 100 comprises two or more elongated arrangements 600 that are positioned along each other, e.g. parallelly to each other. Then, the blocking structure 700 can form a zigzag-pattern, i.e. at least portions of a projection of the blocking structure on a horizontal plane can form the zigzag-pattern.The holder(s) 785 can preferably be located at a distance from the rotation axis of the elongated arrangement 600. The distance can be adapted based on a length from the rotation axis to the distal portion of the elongated arrangement 600. The distance can be slightly greater than said length. Flowever, as a variant of the embodiments with the elongated support 140, the distance can be slightly less than said length. In the example, depicted in Figure 23b, the holder 785 is located centrally between the first and second elongated arrangement 600.Figure 24 illustrates that one of the first and second portions 751, 752 is connected to a distal end of a beam 105 that connects to the ground. Sometimes, both first and second portions 751, 752 are connected to the distal end, or even a respective distal end in case the beam 105 provides two distal ends (or if there is a second beam next to the aforementioned beam).Figure 25a illustrates further examples of the system 100, in which the blocking structure 700 is realized by means of one or more lines 760, such as wires, ropes, strings, cables, cords, threads, filaments, strands, ribbons, tapes, bands, strips, or the like. Generally, the blocking structure is elongated and flexible. The lines can have the same, similar and / or corresponding features or the lines can have different features, selected from the examples herein. For simplicity, a line of said one or more lines 760 is considered. One end of the line 760 can be connected to, such as fixed to, mounted at, or the like, a portion of the beam 105. The other end of the line 760 can be connected to the distal portion 610 of the elongated arrangement 600.More generally, also with reference to Figure 25a according to some examples, the blocking structure 700 comprises a flexible elongated member 760, such as a line, or the like, that is connected to the distal portion 610 of the elongated arrangement 600 and to a fixed point 765 located below, at least along the vertical direction, the distal portion's 610 location when not subjected to wind.In some embodiments, the fixed point 765 is located at the suspension structure, such as a beam 105, or the like. In some embodiments, the fixed point 765 is attached to the suspension system of the solar panels, such as a lower part of the beam 105, or located on the ground in the vicinity of, or in, an area beneath the solar panels.The portion of the beam 105, at which the end of the line 760 can be connected, can extend from the ground up to a particular level at the beam 105. The particular level can preferably be at or lower than at a point of the beam that is at the same level as or lower than, i.e. in terms of distance from the ground, the other end of the line 760, when the elongated arrangement 600 is at the end of the rotation interval. Expressed differently, the particular level can be lower than a point given by a projection of the other ends projection on the beam, when the elongated arrangement 600 is at the end of the rotation interval.In some examples, the particular level can be at the same level, or lower than, i.e. in terms of distance from the ground, the other end of the line 760, when the elongated arrangement 600 is at rest, e.g. vertical, at a preset angle, or the like.In some examples, the particular level can be located in the vicinity of the ground. In this manner, the rotation interval can be conveniently adjusted by a person, such as an operator, user or the like, standing on the ground. The rotation interval is thus adjusted by adjusting the length of the line between the fastening points at the beam (or at the ground) and the elongated arrangement 600. However, the rotation interval can be adjusted in this manner in any embodiment herein. Yet, the adjustment may be less convenient if the fastening point at the beam 105 is difficult, but possible, to reach for the person, e.g. using a ladder or similar if necessary.There can be any number of lines 760 arranged, such as connected, mounted, or the like, as described herein. Sometimes, a line can extend from one fastening point at one of the beams 105 to another fasting point at the other beam 105, while passing the distal portion of the elongated arrangement. At the passage of the elongated arrangement 600, the line can be fixed, or it can run through a hole, or the like.Figure 25b illustrates a still further example of the system 100. In this example, the blocking structure 700 is arranged and / or configured to prevent the wind-responsive solar panel from assuming a vertical position, e.g. when a main extension plane of the wind-responsive solar panel is parallel with a vertical plane. This is achieved by a flexible elongated member 761, which can be similar to the one mentioned above in relation to Figure 25a, in combination with a protruding element 763 of the elongated arrangement 600. In this manner, the solar panel can assume a desired angle with respect to a vertical plane, e.g. at least when not exposed to winds that are strong enough to displace the solar panel from its resting position at the desired angle. The resting position is assumed to due gravity and the combination of the protruding element and the flexible elongated member, e.g. as mentioned together prevent further downward movement, or rotation.In some examples, the protruding element extends from a rotation axis of the elongated arrangement 600, e.g. in a direction that is traverse, e.g. perpendicular, with respect to a main extension plane of the solar panel. For purposes of illustration, the wind-response solar panel to the right in Figure 25b hangs freely and thus assumes a vertical position. An angle between the main extension plane of the solar panel and the protruding element can be in an interval of 45-90 degrees, 50-90 degrees, 60-90 degrees, 70-90 degrees, 80-90 degrees, or the like. Notably, e.g. when said angle is 92 degrees, it is the same as that the angle is 88 degrees, and this applies for any example of the angle above 90 degrees. However, it can still be preferred that the protruding element 763 lies in a plane that is perpendicular to the rotation axis of the elongated arrangement 600.Therefore, in some examples, the blocking structure 700 comprises a flexible elongated member 761 that is connected to a protruding element 763 of the elongated arrangement 600 and to a fixed point 764 located at a suspension structure 130 or a beam 105 of the solar panel suspension system 100. The protruding element can be a shaft, a pin, a rod, a beam, or the like. The protruding element 763 may preferably be rigid and / or stiff. However, some flexibility can sometimes be beneficial, e.g. in order to dampen a blocking action achieved by the flexible elongate member 761 and the protruding element 763. Typically, each end of the elongated arrangement 600 can be provided with a respective blocking structure 700 of this kind, i.e. for each end there is a respective protruding element and a respective flexible elongated member.The fixed point 764 can preferably be located on the beam 105, and e.g. at a portion thereof that may be selected such as that a length of the flexible elongated member 761 is from a minimum length up to e.g. 200%, 180%. 150%, 130%, or the like, of the minimum length.The minimum length can be determined based on the desired angle, below which the solar panel should not rotate, and a position, on the protruding element 763, at which position one end of the elongated flexible element 761 is fastened. This means that the fixed point can be located in an interval spanning a number of suitable positions at different vertical positions, e.g. with respect to the ground (not shown).As described above, one end of the flexible elongated member 761 is connected at the fixed point 764. The other end, or another portion, of the elongated member 761 can be connected to the protruding element 763, e.g. at a portion thereof. The portion includes a connection point 762 of the protruding element 763 at which connection point 762 said other end of the flexible elongated member 761 can be fastened. The portion can be a distal portion, e.g. where distal is understood in relation to the protruding element's fastening point at the elongated arrangement 600. The portion can be located at the middle of the protruding element 763. At any rate, an effective length of the protruding element 763 is from a fastening point at the elongated arrangement 600 to the portion, such as to the connection point 762, or the like, where the other end of the elongated member 761 is fastened at the protruding element 763. Then, as an example, the portion can be defined as being located at a distance, corresponding to the effective length, from the fastening point, i.e. at an effective distal end of the protruding element.Furthermore, it can, at least according to some examples, be that the desired angle is determined by a combined effect achieved by the length from the elongated arrangement 600 along the protruding element 763 to the connection point 762, the length of the flexible elongated member 761, the fixed point's 764 position on the beam 105 and / or on the suspension structure 130, the protruding element's angle relatively the main extension plane of the elongated arrangement 600. In addition, the protruding element may be straight, curved, have one or more angles between straight portion forming the protruding element, etc. That is to say, one and the same desired angle may be achieved by a plurality of combination of these aforementioned variables, and / or similar variables, that determines the desired angle.With reference to Figure 26, examples of the rotation interval are described. These examples are generally applicable to the examples of the blocking structure described herein. Figure 36 illustrates a plan view in the yz-plane as seen along the longitudinal direction of the elongated arrangement 600, the wind-responsive solar panel, and the like. An angle of rotation can be defined as being zero, e.g. when the wind-responsive solar panel is vertical, such as when not exposed to wind, at least according to some examples. Flowever, the angle being zero can be defined in many other ways. With zero on a vertical direction, the interval can, for example, be from -60° to 60°, from -70° to 70°, from -80° to 80°, from -85° to 85° or the like. These are all examples of symmetric intervals. Flowever, also non-symmetric intervals can be chosen. As explained before herein, the angle at which rotation can be limited, such as stopped, prevented, inhibited, or the like, can be from e.g. 45°, 60°, or 70°, or the like, up to e.g. 110°, 100°, 90°, 85°, or the like.In some embodiments, possibly combined with any one or more of the embodiments herein, the blocking structure 700 comprises a shock absorbing material at least at portions of the blocking structure 700 that are arranged to abut the elongated arrangement 600 when located outside the rotation interval. Examples of a shock absorbing material include rubber, foam, gel, silicone, elastomer, neoprene, polyurethane, or the like.Figure 27 and Figure 28 illustrates that, in some examples, the limitation of the rotation interval can be achieved by that the beam 105 is provided with at least one, preferably two, stop heel(s) 106, e.g. at its distal end. Each of said at least one stop heels 106 can be arranged to limit rotation of the elongated arrangement 600, e.g. at 90 degrees, 85 degrees, 80 degrees, 75 degrees, 70 degrees, or the like. This can be achieved by that the elongated arrangement 600 comprises a bar portion 602 that can be received by a hole 170 in the distal end of the beam 105, wherein the bar portion 602 includes a projecting element 601. The projecting element 601 can arranged to limit the rotation outside the rotation interval. This means for example that, when the elongated arrangement 600 has rotated to an end of the rotation interval, the projecting element 601 abuts one of said at least one stop heel 106.Figure 29 illustrates the elongated arrangement 600, including the wind-responsive solar panels, can include at least one bar element, preferably two bar elements. A bar element can be an element that is shaped as, at least to some extent, a bar. Each of said at least one bar element can be arranged, such as provided, located, or the like, at a respective end of the elongated arrangement 600. The elongated arrangement 600 can include said at least one bar element that runs at an upper element of the elongated arrangement 600. Explicitly, the elongated arrangement 600 must not, even if it can do so in some examples, include a bar, i.e. one bar, that extends from one end of the elongated arrangement 600 to the other end of the elongated arrangement 600.From Figure 20, it can be seen that each solar rod assembly 200 or elongated arrangement 600 can include one or more respective solar panels 400 and a respective solar cell rod 500 for each one of said one or more respective solar panels 400. As explained above, an exemplifying elongated arrangement 600 can include a number of solar rod assemblies 200 that are interconnected with each other using interconnection lines 120, whereby rows of wind-responsive solar panels 400 are formed.Further, Figure 20 illustrates that a suspension structure can be a distal end 109 of a beam 105 or a suspension bar 130 (extending into the plane of the paper). A distal portion 610 of the elongated arrangement 600 can be a lowest portion of the elongated arrangement 600, e.g. when located in a predefined angle.Moreover, the solar panel suspension system 100 comprises a first elongated arrangement 600 that is provided with a first set of the wind-responsive solar panels 400, which extend towards the ground, and a second elongated arrangement 600 that is provided with a second set of the wind-responsive solar panels 400, which extend towards the ground. The first and second sets of the wind-responsive solar panels 400 are non-overlapping with each other. The first and second elongated arrangements 600 run transversally to the two elongated suspension structures 130. Each one of the first and second elongated arrangements 600 is suspended and extends between the two elongated suspension structures 130. The first and second elongated arrangements 600 run alongside each other.An advantage can hence be that a very large area above the ground can be used for suspension of solar panels, while at the same time few and / or slender beams take up valuable space at the ground level. Additionally, the solar panel suspension system may be sufficiently steady and / or rigid to withstand rough weather conditions, such as rain, wind, at least to a certain extent, hail and the like.In more detail, each end of the horizontal elongated support structure can be connected to a respective one of the respective pair of distal ends 109.Furthermore, the two parallel, horizontal elongated support structures 130 and the first and second elongated arrangements 600 can span a surface that is at least partly horizontal, substantially horizontal, or the like. The surface can be a plane. When the two parallel, horizontal elongated support structures 130 comprises, such as are, are embodied as, or the like, two wires 130, each of said two wires 130 can describe a parabolic graph due to being suspended, an almost straight line or the like. This can be advantageous because a wire can be hung in a parabolic way between two supporting structures, where the distance between the two supporting structures is very long while still being able to support the weight of the wire as well as the weight of the other parts of the solar panel suspension system, such as the wind-responsive solar panels, the rods etc.In some embodiments, each one of the two parallel, horizontal elongated support structures 130 comprises a respective wire 130.In some embodiments, each one of the two parallel, horizontal elongated support structures 130 is at least 25 meters, at least 35 meters, or at least 50 meters.In some embodiments, the first and second set of wind-responsive solar panels 400 extend towards the ground from a respective bottom surface 531 of the first and second elongated arrangements 600, respectively.In some embodiments, each elongated support structure 130 is suspended between the respective pair of distal ends 109, e.g. by means of a respective suspension line 115, 116 at each distal end 109.In some embodiments, each one of the first and second elongated arrangements 600 comprises a respective rod 500 that extends between and connects to, directly or indirectly, said at least two elongated support structures 130. The respective rod 500 is provided with the first or second set of wind-responsive solar panels 400, respectively. Each wind-responsive solar panel 400 of the first and second sets of wind-responsive solar panels 400 extends, towards the ground, from a respective bottom surface 531 of the respective rod 500. The respective bottom surface 531 faces the ground.In some embodiments, each one of the first and second elongated arrangements 600 comprises a respective set of interconnectable solar rod assemblies 200. Each solar rod assembly 200 comprises a respective rod 500 having a respective line holding portion 520 at each end thereof. The respective rod 500 is provided with a respective set of the wind-responsive solar panels 400. The respective set of wind-responsive solar panels 400 extend, towards the ground, from the respective bottom surface 531 at the respective rod 500. Each one of the first and second elongated arrangements 600 comprises at least two respective suspension lines 115, 116 arranged to suspend the set of interconnectable solar rod assemblies 200 between the two suspension structures 130 by being connected to the respective line holding portion 520 at each end of the respective rod 500. In these embodiments, said each elongated support structure 130 can be realized by an aforementioned suspension bar.In some embodiments, the solar panel suspension system 100 comprises a third elongated arrangement 600 that is provided with a third set of the wind-responsive solar panels 400, which extend towards the ground. Each one of the first, second and third elongated arrangements 600 comprises three respective solar cell rods 500. Each one of the three solar cell rods 500 is provided with the first, second and third set of the wind-responsive solar panels 400, respectively. The third elongated arrangement 600 can have the same, similar, or corresponding features as the first and / or second elongated arrangement 600.In some embodiments, the respective rod 500 of at least one of the solar rod assemblies 200 of the set of solar rod assemblies 200 is defined by any one of the examples thereof.In some embodiments, at least one wind-responsive solar panel of the respective set of the windresponsive solar panels 400 of at least one of the solar rod assemblies 200 of the set of solar rod assemblies 200 is defined by any one of the examples thereof.Thus, in some examples, there is provided examples of a solar panel suspension system 100 for suspension at least one wind-responsive solar panel 400 above ground, thereby making the ground available. The solar panel suspension system 100 comprises at least two beams 105 that are spaced away from each other. Each beam 105 has a non-zero vertical directional component.Furthermore, the solar panel suspension system 100 comprises an elongated arrangement 600 that is provided with said at least one wind-responsive solar panel 400, which extends towards the ground, e.g. from the groove 510 of the solar cell rod 500. The elongated arrangement 600 extends between said at least two beams 105 by being connected, directly or indirectly, at a respective distal end 109 of each beam 105 of said at least two beams 105. The elongated arrangement 600 can be said to be suspended between the respective distal ends 109 of said at least two beams 105. Each distal end 109 can comprise a respective suspension point or, expressed differently the respective suspension point can be located at, or on, the respective distal end 109.According to further examples, the solar panel suspension system 100 can be arranged to biasedly hold the wind-responsive solar panel 400 towards a predefined rotation angle. Furthermore, the system 100 is arranged to biasedly hold the wind-responsive solar panels 400 towards the predefined rotation angle within a bias interval, and to apply no or less biasing of the wind-responsive solar panels (400) towards the predefined rotation angle outside the bias interval.Advantageously, the biasing maintains the wind-responsive solar panels at a predefined angle, e.g. with respect to a vertical plane or other reference, also when the solar panels are subjected to wind, e.g. up to a threshold value. Thus, when the wind is stronger, e.g. than the threshold value, the windresponsive solar panel rotates away from the predefined angle. In addition to wind, other factors, such as snow, tilt of the system, or the like, can cause the wind-responsive solar panels to leave the predefined angle. Thereby, it can be avoided that the wind damages, or degenerates, the solar panel, e.g. in terms of mechanical and / or electrical malfunction. It can be preferred that the predefined angle is selected such as to achieve improved, e.g. optimal, or almost optimal, efficiency of the solar panel's conversion of light to electricity, e.g. as compared to when not consciously selecting the predefined angle.The biasing of the solar panels can be achieved by mechanical bias, e.g. using springs, or the like. The biasing can, also or alternatively, be achieved by one or more magnetic fields, generated by a magnet, such a permanent magnet, an electromagnet, or the like.Still further, the biasing can, also or alternatively, be achieved by that the solar panels are subjected to gravity, e.g. as a dominating biasing factor.According to some embodiments herein, as mentioned, the biasing can be achieved by a combination of a shape of the cross-sections of the shaft and the holding element, which makes general gravity influence the biasing to different extent at different angles, or angle intervals.As an example, when the wind-responsive solar panel has a current rotation angle that is within the bias interval, the biasing structure will contribute to that the wind-responsive solar panel returns to the predefined rotation angle. However, at least in some examples, it may be noted that the windresponsive solar panel can return to the predefined rotation angle also when the current rotation angle is outside the bias interval due to e.g. gravity or other forces not derived from the biasing structure. If the wind is too strong, it may be that the wind-responsive solar panel can not return to the predefined rotation angle.In some examples, the system 100 can be arranged to allow the wind-responsive solar panels 400 to rotate freely with respect to biasing applied by the system 100 outside the bias interval.In some examples, the system 100 can be arranged to allow the wind-responsive solar panels 400 to be freely rotatable in at least a free rotation interval outside the bias interval. The free rotation interval can have an extension of 0, 5, 10 degrees, 70, 80 or 90 degrees, or another suitable value depending on circumstances of the application. Here, extension refers to a length, expressed in degrees, of the free rotation interval, i.e. not a start point and an end point of the interval. With reference to the angular coordinate system of Figure 26, the start point can be / -10 degrees, / -20 degrees, / -30 degrees, or the like, and the end point can be / -90 degrees, / -80 degrees, / -70 degrees, or the like.Notably, the general features of the system 100 described above is also applicable in the following. Furthermore, it shall be noted that any one or more of the examples relating to the blocking structure and be combined with any one or more of the examples relating to the biasing structure, when reasonably possible.Figure 31 illustrates an example of the elongated arrangement 600. Generally, with the embodiments herein, the elongated arrangement 600 comprises a suspension part 771, such as the plate 770, or the like. Moreover, the elongated arrangement 600 comprises a solar panel part 772, such as the shaft 790, which can be hollow or homogenous depending on realization according to the examples herein. The wind-responsive solar panels are fixedly connected to, such as mounted, integrated with, or the like, the solar panel part 772. Accordingly, the solar panel part 772 comprises, such as includes, is provided with, is fixedly connected to, the wind-responsive solar panels 400.Figure 31 further shows that the elongated arrangement 600 can include a respective plate 770 at each end thereof. The respective plate 770 can be fixedly connected to a respective one of the two suspension point 110, illustrated in the examples herein.In the example of e.g. Figure 31 and Figure 32, it can be seen that an aperture 780 is formed by inner surfaces 787 of the plate 770. The inner surfaces can form a shape, in a cross-section, e.g. in the yzplane. The shape can be described as a union of a partially oval, primary part 788, such as a circular or elliptic part, or the like, and a partially oval, secondary part 789, such as a circular or elliptic part, or the like. The partially oval, secondary part 789 can be arranged to create a pit, e.g. as seen in the cross-section, where the pit extends the aperture beyond a boundary of the partially oval, primary part 788.Figure 33 shows one example of where the biasing structure 800, e.g. the inner surfaces 787 as described above, is combined with the blocking structure 700 according to any one of the examples above. There are of course many other combinations of the examples of the biasing structure 800 and the examples of the blocking structure 700.Figure 34 shows a further example, in which the plate 770 is provided with a protrusion 777 that extends towards a center of the primary part 788, e.g. as seen in a cross-sectional yz-plane. The plate 770 is an example of the holding element. The protrusion 777 can extend from the inner surface 787 of the primary part 788, e.g. at a position selected to prevent rotation of the solar panels outside the rotation interval. The protrusion 777 is an example of the blocking structure, since the protrusion can be configured to stop rotation of the shaft 790 when a secondary projection 796 of the shaft abuts the protrusion 777. The secondary projection 796 can be arranged, as seen in a cross-sectional yzplane, to project beyond a border of a primary portion 795 of the cross-section of the shaft, where e.g. the cross-section contributes to forming of the biasing structure.Figure 35 illustrates an example of the solar panel part 772, such as the shaft 790, or the like. The shaft 790 does not necessarily extend between the two plates as shown in Figure 31. The shaft 790 can for example include two bar ends as shown in Figure 29. This is applicable to many other examples herein, while it is understood that the shaft 790, the elongated blocking structure 701, or the like, is meant to represent those parts of the elongated arrangement 600 that contributes to the function of the biasing structure and / or the blocking structure as the case may be. In more detail, according to some examples, the cross-section of the shaft 790 can include the primary portion 795 and a secondary projection 796, e.g. extending away from a center of the cross-section of the shaft 790.In general, a counterweight 929 can be used in combination with the biasing structure. In one example, as shown in Figure 36, the counterweight 929 is provided to counter a rotational moment that occurs due to that the solar panel 400 is arranged at an angle, as seen in the yz-plane, relatively the secondary projection 796. Thereby, the secondary projection 796 and the counterweight 929 are arranged to hold the solar panel at the predefined angle, which then is located at the middle of the biasing interval.In general, it may be preferred that the predefined rotation angle, set by the biasing structure 800, is at the center of the bias interval.According to another example, as shown in Figure 37, the biasing structure can be realized by that the suspension part 771 comprises the shaft 790, optionally including the features thereof as described herein. Further, the biasing structure can be realized by that the solar panel part 772 comprises the aperture 780, optionally including the features thereof as described herein. As indicated by the dashed line in Figure 37, the solar panel part 772 can have an opening. In this manner, reducing the amount of material required and / or providing access, e.g. for maintenance purposes, to the interior of the solar panel part 772.In general, it can be sufficient that only one section, e.g. along the extension direction of the elongated arrangement 600, is configured with the cross-sectional shapes of the aperture 780 and the cooperating shaft 790 as described herein. To reduce wear and tear, it may be preferred that there are at least two such sections, e.g. a respective one at each end of the elongated arrangement 600, but not necessarily. This means that the shape of the cross-section, e.g. of the aperture 780 and / or the shaft790 and / or the like, does not have to be constant, or the same, along the x-axis as shown in the Figures, but it can be the case.Figure 38 and Figure 39 illustrate examples of the cross-section of e.g. the suspension part 771 and the solar panel part 772, respectively. In some examples, Figure 38 and Figure 39 illustrate examples of the cross-section of e.g. the solar panel part 772 and the suspension part 771, respectively, i.e. as illustrated in Figure 37.Figure 38 shows for example that an inner diameter of the suspension part 771 can be greater than an outer diameter x of the solar panel part 772. In this manner, the solar panel part 772 can be allowed to rotate with respect to the suspension part 771. The inner diameter is matched to the outer diameter, e.g. by being set to the outer diameter x plus a margin. The smaller the margin is the stronger force will be required to rotate, i.e. stronger wind. The same or similar reasoning applies also for the example of Figure 37, where Figure 38 and Figure 39 then illustrate examples of the crosssection of e.g. the solar panel part 772 and the suspension part 771.In the following, the cross-section formed by inner or outer surfaces of the suspension part 771 and / or solar panel part 772 can be described as a union of two circles with different radius that are connected by tangent lines on opposite sides of a central line through the centers of the two circles. The central line can be vertical.As an example, referring to Figure 38, d2 can be 30% to 90% of dl.With the exemplifying cross-section as shown in Figure 38 and Figure 39, the shape implies that the shaft 790 can find the lowest position in the holding element 780, e.g. even when a symmetric central line of the cross-section of the holding element is tilted, e.g. at an angle, such as up to e.g. 30 degrees, or the like, resistance, e.g. in terms of torque, gradually decreases towards the bias interval's start and end.In a further example, shown in Figure 40, the shape can be formed similar to as in Figure 31 to 37, wherein transition from the primary part 788 to the secondary part 789 is smooth and / or wherein transition from the primary portion 795 to the secondary projection 796 is smooth.Figure 42 and Figure 43 illustrates that any one of the examples herein can include an additional secondary part 789b and / or an additional secondary projection 796b.Figure 44 shows a further example of the biasing structure, e.g. in terms of the cross-sectional shapes of the suspension part 771 and the solar panel part 772. With some examples, as shown before, any one of the suspension part 771 and the solar panel part 772 can enclose, as seen in the cross-section under observation, e.g. in the yz-plane, the other one of the suspension part 771 and the solar panel part 772. In Figure 44, solar panels 400 are provided at the outer solar panel part 772. In this context, it can be noted that with the examples of the shape as the biasing structure 800, the shape can be turned upside down, when it is desired to view e.g. an example with the solar panel part 772 as the inner part, as an example with the solar panel part 772 as the outer part. Cf. e.g. Figure 31 and Figure 37.According to Figure 44, the suspension part 771 can have a circular cross-section as the primary part 788 with an indentation as the secondary part 789. The indentation is configured to extend from a circle forming the primary part towards a center of the circle. The solar panel part 772 can have a circular cross-section as the primary portion 795 and a secondary projection 796 formed between two depressions 796d. The two depressions extend outside a circle forming the primary portion, whereby the secondary projection 796 is formed therebetween. The secondary projection 796 extends to the circle forming the primary portion 795, e.g. from outside the circle. The indentation can be configured to receive the secondary projection 796. The circular part of the primary portion 795 can have a diameter that corresponds to, e.g. is equal possibly with some margin, or the like, the diameter of the circular part of the primary part 788. Figure 44 illustrates an example of the inverted embodiments. Based on Figure 44, a corresponding non-inverted embodiment can be realized when the solar panels are attached to the shaft and the cross-sections are turned upside down as compared to the illustration in Figure 44.Figure 45 to Figure 47 illustrate an example in which the biasing structure 800 is implemented by a shaft 790 and a holding element 770. The cross-section of the shaft 790 can be similar or the same as the cross-section(s) described in connection with Figure 38 and Figure 39. In addition thereto, at least a portion 775 of the inner surface 787 is elastically flexible. Said portion can be made of a flexible material. These examples can also be implemented as the inverted embodiments by reviewing the Figures upside down and considering the shaft 790 to be an example of the suspension part 771 and the holding element to be an example of the solar panel part 772.Figure 45 illustrates that said at least a portion 775 of the surface can be made flexible by that the surface is provided with two spring blades, or the like.Figure 46 illustrates that said at least a portion can be elastically and flexibly pushed away to allow the shaft 790 to rotate.Figure 47 illustrates that the shaft 790 is located in the predefined rotation angle and optionally forced to said position by the two spring blades, or the flexible material of the surface. As can be seen in Figure 47, said at least a portion of the inner surface 787 can be biased towards a shape that further reduces, as compared to in e.g. Figure 39, and creates a tapered section of the cross-section. In Figure 46, it is illustrated that the shaft 790 is about to leave the tapered section and the rotate freely, e.g. at least with respect to the elastically flexible inner surface 787 that can be biased towards a tapered shape. When the shaft 790 rotates freely, the solar panel part 772 is outside the bias interval.In a further example, shown in Figure 48, the biasing structure 800 is realized by a magnet 801 and a magnetic material 802. The magnet 801 can be provided at, or in, the suspension part 771 and the magnetic material 802 can be provided at, or in, the solar panel part 772. Alternatively, the magnetic material 802 can be provided at, or in, the suspension part 771 and the magnet 801 can be provided at, or in, the solar panel part 772. In this example, the suspension part 771, such as the plate 770, is configured to receive the shaft 790. However, in other examples, similarly to as in e.g. Figure 37, the solar panel part 772 can be configured to receive the suspension part 771.When the suspension part 771 is realized by the plate 770 of the elongated arrangement (600), the plate 770 can be arranged for suspension of the elongated arrangement 600 at one of the two suspension points 110. Further, the plate 770 can include, such as be provided with, integrate, or the like, the magnet 801 or the magnetic material 802. An end of the elongated arrangement 600, such as a bar end, can be configured to be receivable by the plate 770. Then, the bar end can include, such as be provided with, integrate, or the like, the magnet 801 or the magnetic material 802.With the example of Figure 48, the magnet 801 and / or the magnetic material 802 can be located at a lower part of the suspension and / or solar panel part 771, 772, e.g. as seen with respect to the inner and / or outer cross-sections thereof. In this manner, the biasing provided by the magnet 801 and the magnetic material 802. The magnet 801 and / or the magnetic material 802 can, in some examples, be located at an upper part of the suspension and / or solar panel part 771, 772, e.g. as seen with respect to the inner and / or outer cross-sections thereof.It may be preferred that the magnet 801 and the magnetic material 802 are located centrally, e.g. at a vertical center line of the cross-sections of the suspension and / or solar panel part 771, 772. In this manner, any weight of the magnet or magnetic material contributes in a balanced manner, e.g. symmetrically, towards or against the biasing provided by the magnetic attraction between the magnet and the magnetic material.In some examples, the magnetic material 802 can be a further magnet. Then the magnet 801 can be a first magnet and the further magnet can be a second magnet, where the first and second magnets are two separate magnets. The first and second magnets are thus not the same magnet. The first and second magnets can be configured to magnetically attract each other, e.g. by being arranged such that opposing poles brings the solar panels towards the predefined rotation angle.Figure 49 to Figure 52 shows examples, in which the biasing structure 800 is realized by a flexible blade 804 arranged to hold the elongated arrangement 600 at the predefined angle by abutting a surface 803 in a cut-out into a bar end of the elongated arrangement 600. The bar end can refer to any of the terminal ends of the elongated arrangement 600, e.g. any one of the two terminal ends of the shaft. The flexible blade can be made of any flexible material, such as metal, plastic, fiber glass, or the like. The flexible blade 804 can be a leaf spring, a flexible elongated quadrangular sheet, single or multilayered leaf spring, a blade spring, or the like.Figure 50 shows, by the dashed line, that a part of the aperture can be larger to make room for the flexible blade 804.A cross-section of the bar end, e.g. in the yz-plane, can have a shape of a circular segment, wherein a chord of the circular segment runs in the surface 803.The circular segment can have a central angle of 180 degrees or more. The circular shape of the segment abuts the flexible blade 804 when the solar panels are rotated to positions outside the bias interval. In some examples, the cut-out can have a cross-section chord that is formed as an arc, instead of a line. The arc can then have a radius that is greater than, e.g. 5, 10, or 20 times greater than, the radius of the circle depicting the cross-section of the bar end.Figure 53 to Figure 56 show further examples of how to implement the biasing structure 800 by configuring the cross-sections of the suspension part 771 and the solar panel part 772. According to Figure 53 the inner surface 789 of the suspension part 771 is configured to receive the solar panel part 772 and to allow it to rotate within the inner surface 789, e.g. limiting movement of the solar panel part 772 along the z-axis, but allowing at least some movement along the y-axis whereby the solar panel part 772 can leave the biasing interval and / or the predefined rotation angle.As shown in Figure 53, the suspension part 771 can include a tap 820, such as a sprint, a projection, a protruding element, or the like. The solar panel part 772 is configured to receive the tap 820 into a hole 821, such as a groove, a cavity, or the like. The hole 821 can emerge at the curved surface of the solar panel part 772. The solar panel part 772 can have a circular cross-section, e.g. in the yz-plane. The tap 820 can be made of a flexible material or a form-stable material. For example, the tap 820 can be made of plastic, composite, metal, rubber, or the like. The tap 820 can be an example of the elongated element 805.Figure 54 illustrates that the tap 820 can abut and slide along the outer perimeter of the solar panel part 772 when the solar panel has left the predefined angle and the biasing interval.Figure 55 illustrates that it may be beneficial to mount the tap 820 at a position that is translated along the x-axis and spaced away from a position along the x-axis of a portion of the suspension part 771 that prevents movement of the solar panel part 772 along the z-axis. In this manner, the tap 820 can be easy to access and replace when worn, e.g. worn out. When the tap 820 is worn, it can happen that the wind required for the solar panel to leave the predefined rotation angle and / or the bias interval has been reduced as compared to when the tap 820 was complete, e.g. not worn, not degenerated due to use, new, or the like. This can be beneficial when the material of the tap 820 is softer and more likely to wear than the material in the solar panel part 772. The tap 820 can be attached without screws or with a maximum of 2 screw so it can be replaced by a fast and simple operation. Also, the tap's 820 material can be softer than material of the solar panel part 772. Thus, causing less wear on the solar panel part 772.Figure 56 A through Figure 56 H shows a few examples of the cross-section of the tap 820 and the solar panel part 772. The solar panel part 772 can thus have a hole that forms a wedge A, B, a rectangle C, a rectangle with beveled walls D, into the cross-section of e.g. the solar panel part 772, such as the shaft, or the like. In the example D, a larger torque, to counteract gravitation, is required initially, and then less when the part of the wall with less angle is reached, and finally - as with all of the examples in Figure 56, no biasing due to the shape when the circular part of the cross-section abuts the tap 820.The tap 820 of the suspension part 771 can thus have a cross-sectional shape in the form of a wedge E, F, a rectangle with concave circular roof G, a rectangle H, or the like.In a further example, as shown in Figure 57 to Figure 62, the biasing structure 800 is implemented by that the suspension part 771 comprises an elongated element 805 realized as a spring plunger 806. The spring plunger 806 is arranged to hold the elongated arrangement 600 at the predefined angle by being received into an excavation 807 of a bar end of the elongated arrangement 600, such as the shaft 790. The spring plunger 806 can be biased, e.g. by means of a spring 808, or the like.The excavation 807 can be a cylindrical hole. Then, it can be preferred that the spring plunger 806 does not extend to far into the solar panel part 772. In examples, where the spring plunger 806 is provided with a ball (not shown) at the end extending into the hole, it can be that cylindrical hole has a depth that is less than half the diameter of the ball. Flowever, the spring plunger 806 can also, or alternatively, be positioned, e.g. along the vertical direction, to ensure that the solar panel part 772 can escape from the spring plunger 806, when the solar panel is subjected to sufficiently strong wind, e.g. above a threshold value. In this manner, the spring plunger 806 forces the solar panel back to the predefined rotation angle within the bias interval.Figure 61 and Figure 62 illustrate that the excavation 807 can have a conical shape, e.g. where the base of the conical shape emerges at the outer surface of the solar panel part 772. In this manner, the elongated element 805 can for example be realized as a plunger, or the like, i.e. only biased towards the solar panel part 772 by gravity. Thanks to opening at the base of the conical shape, the plunger can find its way to the tip of the conical shape. The excavation 807 can have any other suitable tapered shape assist the elongated element 805 to bring the solar panel to the predefined rotation angle. The elongated element 805 is not shown in Figure 61 and Figure 62 for reasons of simplicity.Figure 63 to Figure 65 illustrate that the elongated element 805 can be implemented as a blade 809. In other examples, the elongated element 805 can be implemented as a rod, a sheet, a pin, a plug, or the like. As in the examples above, the blade 809 can be biased, e.g. mechanically, magnetically, or by gravity, towards the solar panel part 772. Figure 64 illustrates that a wedge shape is formed in the solar panel part 772. This means for example that at least a portion of the cross-section, e.g. in the yz-plane, of the solar panel part 772, such as the bar end, can have the shape of a circular sector, e.g. with a central angle a of e.g. 200 degrees, 250 degrees, 300 degrees or more, or another suitable angle. Flowever, in some examples, the cross-section of the solar panel part 772 can have the shape of a circle with a cut-out wedge, where the tip of the wedge does not necessarily coincide with the center of the circle as is the case when the cross-section resembles a circular sector.Figure 65 is provided to illustrate that a coordinate system that is aligned with the system 100, the elongated arrangement 600 and the like, as exemplified herein, can be rotated, tilted and / or translated with respect to a global coordinate system (not shown), having a horizonal xz-plane, a vertical yz-plane and a vertical yx-plane, where the vertical yz-plane and the vertical yx-plane are orthogonal.In the examples of Figure 49 to Figure 65, the suspension part 771 of the elongated arrangement 500 can implemented as an integral part of the beam 105, if desired.Each embodiment, example or feature disclosed herein may be combined with one or more other embodiments, examples or features disclosed herein. Examples of embodiments that can be combined includes, but are not limited to for example:- Example of Figure 23b combined with example of Figure 18 and Figure 19,- Example of Figure 27 combined with example of Figure 31,- Example of Figure 15B combined with example of Figure 16,- Example of Figure 17A combined with example of Figure 13A,- and more.Even though embodiments of the various aspects have been described above, many different alterations, modifications and the like thereof will become apparent for those skilled in the art. The described embodiments are therefore not intended to limit the scope of the present disclosure.As used herein, the terms "include" and "comprise" have been used interchangeable and are intended to have the same meaning, i.e. that any additional features, such as elements, parts, items, or the like, can also be present even if not explicitly mentioned. The terms "comprise" and "include" are thus open-ended.As used herein, the expression "fixedly connected" refers to the state of two or more components being securely joined or attached together in a manner that prevents movement, rotation or separation under normal operating conditions. This term implies a permanent or semi-permanent connection that is not easily disassembled without the use of tools or deliberate effort, which can include permanent or temporary destruction of the components and / or their fixed connection. The expression indicates a stable and durable relationship between the components.LISTING OF EXAMPLES RELATING TO THE BIASING STRUCTURE1. A solar panel suspension system (100) for suspending wind-responsive solar panels (400), wherein the system (100) comprises:two suspension points (110),an elongated arrangement (600) that is suspended and extends between the two suspension points (110), wherein the elongated arrangement (600) comprises the wind-responsive solar panels (400), wherein the elongated arrangement (600) is arranged to permit rotation of the wind-responsive solar panels (400) about a rotation axis (R) running along a main extension direction of the elongated arrangement (600), anda biasing structure (800) arranged to bias the wind-responsive solar panel (400) towards a predefined rotation angle,wherein the biasing structure (800) is arranged to apply its biasing of the wind-responsive solar panels (400) towards the predefined rotation angle within a bias interval, and to apply no or less biasing of the wind-responsive solar panels (400) towards the predefined rotation angle outside the bias interval.2. The system (100) according to the preceding example, wherein the biasing structure (800) is arranged to allow the wind-responsive solar panels (400) to rotate freely with respect to biasing applied by the biasing structure (800) outside the bias interval.3. The system (100) according to any one of the preceding examples, wherein the wind-responsive solar panel (400) is freely rotatable in at least a free rotation interval outside the bias interval.4. The system (100) according to any one of the preceding examples, wherein the biasing structure (800) comprises a suspension part (771) and a solar panel part (772).5. The system (100) according to the preceding example, wherein the suspension part (771) comprises a shaft (790) and the solar panel part (772) comprises a holding element (770), or wherein the suspension part (771) comprises a holding element (770) and the solar panel part (772) comprises a shaft (790), wherein preferably the holding element (770) is configured to receive the shaft (790), e.g. in an aperture (780) of the holding element (770).6. The system (100) according to any one of the preceding examples, wherein the biasing structure (800) comprises a flexible blade (804) arranged to hold the elongated arrangement (600) at the predefined angle by abutting a surface (803) in a cut-out into a bar end (791) of the solar panel part (772).7. The system (100) according to the preceding example, wherein a cross-section of the bar end (791) has a shape of a circular segment, wherein a chord of the circular segment runs in the surface (803).8. The system (100) according to any one of the preceding examples, wherein the biasing structure (800) comprises an elongated element (805) arranged to hold the elongated arrangement (600) at the predefined angle by being received into an excavation (807) of a bar end (791) of the elongated arrangement (600).9. The system (100) according to the preceding example, wherein the excavation (810) comprises a hole (811).10. The system (100) according to the preceding example, wherein the excavation (810) comprises a v-shaped cavity (811), e.g. the cross-section of the excavation (810) in the yz-plane is v-shaped, where e.g. a point of the v-shape is directed towards a center of the bar end.11. The system (100) according to any one of examples 8-10, wherein the elongated element (805) is sheet-shaped.12. The system (100) according to any one of examples 8-11, wherein the elongated element (805) is biased towards the excavation (810) by gravity or a mechanical spring.13. The system (100) according to any one of examples 8-12, wherein the elongated element (805) comprises a spring plunger (806) facing towards the excavation (807, 810).14. The system (100) according to any one of the preceding examples and example 5, wherein the holding element (770) and the shaft (790) that are arranged to cooperate to hold the windresponsive solar panel(s) (400) at the predefined angle by that the holding element (770) and the shaft (790) have a respective cross-sectional shape that cooperates to apply their biasing of the wind-responsive solar panels (400) towards the predefined rotation angle within the bias interval, and to apply no or less biasing of the wind-responsive solar panels (400) towards the predefined rotation angle outside the bias interval.15. The system (100) according to the preceding example, wherein the holding element (770) is fixedly connected at at least one of the suspension points, and the shaft (790) is fixedly connected to the solar panels (400).16. The system (100) according to any one of the preceding examples, wherein a / the holding element (770) has inner surface (787) forming an aperture (780) configured to receive the shaft (790), wherein at least a portion of the inner surface (787) is elastically flexible.17. The system (100) according to any one of the preceding examples, wherein the blocking structure (800) comprises a magnet (801) and a magnetic material (802).18. The system (100) according to the preceding example, wherein a plate (770) of the elongated arrangement (600) is arranged for suspension thereof at one of the two suspension points (110), wherein the plate (770) comprises the magnet (801) or the magnetic material (802).19. The system (100) according to the preceding example or the example preceding the preceding example, wherein a bar end () of the elongated arrangement (600), receivable by the plate (770), comprises the magnet (801), or the magnetic material (802).20. The system (100) according to any one of the preceding examples and example 5, wherein the shaft (790) has a cross-section, e.g. in the yz-plane, comprising a circular primary part (788) and a secondary part (789) forming an indentation extending from a circle defining the primary part (788) towards a center of the circle, and wherein the holding element (770) has a cross-section, e.g. in the yz-plane, comprising a circular primary portion (795) and a secondary projection (796) formed between two depressions (796d), wherein the two depressions (796d) extend outside a circle of the circular primary portion (795).21. The system (100) according to the preceding example, wherein the indentation of the secondary part (789) is configured to receive the secondary projection (796).22. The system (100) according to example 20 or 21, wherein the circle of the primary portion (795) has a diameter that corresponds to a diameter of the circle defining the primary part (788).23. The system (100) according to any one of the preceding examples, wherein the system (100) comprises the blocking structure (700) according to any one of the embodiments herein.

Claims

1. A solar panel suspension system (100) for suspending wind-responsive solar panels (400), wherein the system (100) comprises:two suspension points (110),an elongated arrangement (600) that is suspended and extends between the two suspension points (110), wherein the elongated arrangement (600) comprises the wind-responsive solar panels (400), wherein the elongated arrangement (600) is arranged to permit rotation of the wind-responsive solar panels (400) about a rotation axis (R) running along a main extension direction of the elongated arrangement (600), anda blocking structure (700, 701, 702, 710, 711, 712, 730, 731, 732, 140) arranged to apply its limitation of the rotation of the wind-responsive solar panels (400) outside a rotation interval.

2. The system (100) according to the preceding claim, wherein the rotation interval is defined by that, at an end point thereof, a distal portion of the elongated arrangement (600) abuts the blocking structure (700) and / or that the blocking structure (700) is arranged to begin application of the limitation of the rotation at an / the end point of the rotation interval.

3. The system (100) according to any one of the preceding claims, wherein the blocking structure (700) is elongated, wherein the blocking structure (700) is arranged along the elongated arrangement (600).

4. The system (100) according to any one of the preceding claims, wherein the blocking structure (700) is elongated, wherein the blocking structure (700) is arranged transversally to the elongated arrangement (600).

5. The system (100) according to any one of the preceding claims, the blocking structure (700) is arranged to abut, from above, a distal portion (610) of the elongated arrangement (600), when the elongated arrangement (600) is forced to an / the end of the rotation interval.

6. The system (100) according to the preceding claim, wherein the blocking structure (700) runs through a slot in the elongated arrangement (600).

7. The system (100) according to the preceding claim, wherein the elongated arrangement (600) comprises a longitudinal protrusion (711, 712) that is arranged to abut the blocking structure (700) when the elongated arrangement (600) is forced to the end(s) of the rotation interval.

8. The system (100) according to any one of the preceding claims, wherein the blocking structure (700) is mounted in, or at, a plate (770), which is connected to a suspension structure (130) of the solar panel suspension system (100).

9. The system (100) according to any one of the preceding claims, wherein the system (100) comprises a further blocking structure (700, 703) arranged to abut a central and distal portion (713) of the elongated arrangement (600), when the elongated arrangement (600) is forced to an / the end of the rotation interval.

10. The system (100) according to any one of the preceding claims, wherein the system (100) comprises an additional blocking structure (704), wherein the additional blocking structure (704) is elongated, wherein the additional blocking structure (704) is arranged transversally to the elongated arrangement (600), wherein the elongated arrangement (600) comprises an additional longitudinal protrusion (721, 722) that is arranged to abut the additional blocking structure (704) when the elongated arrangement (600) is forced to the end(s) of the rotation interval,11. The system (100) according to the preceding claim, wherein the additional blocking structure (704) is located closer to the solar panel (400) than the blocking structure (701) as seen in a longitudinal direction.

12. The system (100) according to any one of the preceding claims, wherein the elongated arrangement (600) comprises the blocking structure (730) that comprises a distal, lateral protrusion (730, 731, 732) extending transversally a main extension plane of the solar panels (400), wherein the distal, lateral protrusion (730, 731, 732) is arranged to abut an elongated suspension structure (130) when the elongated arrangement (600) is forced to the end of the rotation interval.

13. The system (100) according to any one of the preceding claims, wherein a distal portion of the solar panel (400) is configured to allow longitudinal distal ends of the distal portion to be offset in relation to a central portion of the distal portion, wherein the central portion is arranged to be offset relatively a geometric line through the longitudinal distal ends of the distal portion, when the solar panel (400) is subjected to wind and an end of the rotation interval is reached.

14. The system (100) according to any one of the preceding claims, wherein the distal portion is flexible.

15. The system (100) according to the preceding claim, wherein at least one of, preferably both, the longitudinal distal ends of the distal portion is provided with an engagement element (781, 782), whereby a risk of that the elongated arrangement breaks free from the blocking structure (700), when the distal portion (610) flexes, is reduced.

16. The system (100) according to any one of claims 9-11, wherein the distal portion comprises one or more stiff sections.

17. The system (100) according to any one of the preceding claims, wherein the distal portion is rigid.

18. The system (100) according to any one of the preceding claims, wherein the blocking structure (750) is stiff and / or rigid, wherein the blocking structure (750) is located at a distal end of the beam (105), wherein the blocking structure (750) comprises a first portion (751) and a second portion (752), wherein the blocking structure (750) is arranged to allow the distal portion of the solar panel to abut the first or second portion (751, 752) when the elongated arrangement (600) is forced to the respective end of the rotation interval.

19. The system (100) according to any one of the preceding claims, wherein the blocking structure (700) comprises a flexible elongated member (760) that is connected to the distal portion (610) of the elongated arrangement (600) and to a fixed point (765) located below, at least along the vertical direction, the distal portion's (610) location when not subjected to wind.

20. The system (100) according to any one of claims 1-18, wherein the blocking structure (700) comprises a flexible elongated member (761) that is connected to a protruding element (763) of the elongated arrangement (600) and to a fixed point (764) located at a suspension structure (130) or a beam (105) of the solar panel suspension system (100).

21. The system (100) according to any one of claims 19-20, wherein the fixed point (765) is located at the suspension structure.

22. The system (100) according to any one of claims 19-21, wherein the fixed point (765) is located on the ground in the vicinity of, or in, an area beneath the solar panels.

23. The system (100) according to any one of the preceding claims, wherein the blocking structure (700) comprises a shock absorbing material at least at portions of the blocking structure (700) that are arranged to abut the elongated arrangement (600) when located outside the rotation interval.

24. A solar panel suspension system (100) for suspending wind-responsive solar panels (400) above ground, comprisingtwo suspension structures (105, 130) directly or indirectly connected to the ground and located at a distance from the ground,an elongated arrangement (600) comprising the wind-responsive solar panels (400), wherein the elongated arrangement (600) is suspended and extends between the two suspension structures (105, 130), andan elongated support (140) suspended and extending between the two suspension structures (105, 130), wherein the elongated support (140) is arranged to directly or indirectly hold, or abut, at the elongated arrangement (600), at a distal portion (610) thereof, and / or of the wind-responsive solar panels (400), at an angle, when the wind-responsive solar panels (400) are subjected to wind above a threshold value.

25. The solar panel suspension system (100) according to the preceding claim, wherein the elongated support (140) is arranged to hold, directly at the distal portion (610) of the elongated arrangement (600), the elongated arrangement (600) at an angle.

26. The system (100) according to any one of the preceding claims, wherein the system (100) comprises the biasing structure (800) according to any one of the embodiments herein.