Holding element and assembly comprising multiple holding elements for at least one solar element

Abstract

The invention relates to a holding element (1) made of a metal sheet for at least one solar element (2), in particular a solar module and / or a solar collector, comprising a base (4) which forms a stand surface (5) for the holding element (1), two supports (6a, 6b) for the solar element (2), said supports projecting from the base (4) to different heights, and connection elements (10) which are provided on end faces (7a, 7b) of the holding element (1) and which have at least one recess (8a, 8b), in particular a hole-shaped recess, and at least one tab (9a, 9b), said tab (9a, 9b) being shaped so as to be introduced into such a recess (8a, 8b). In order to allow a simple installation of the holding element (1), which has a high degree of stability, the invention proposes that at least one respective recess (8a, 8b) and at least one respective tab (9a, 9b) are provided next to each other on each end face (7a, 7b), wherein the metal sheet is a metal-coated steel sheet, in particular a hot-dip-coated steel sheet.

Description

[0001] Holding element and arrangement with several holding elements for at least one

[0002] solar element

[0003] Technical area

[0004] The invention relates to a holding element and an arrangement with a plurality of holding elements for at least one solar element, in particular a solar module and / or solar collector, with a base forming a support surface for the holding element, with two supports for the solar element projecting from the base at different heights, and with connecting elements provided on end faces of the holding element, which have at least one recess and at least one tab, which tab is shaped for insertion into such a recess.

[0005] State of the art

[0006] To ensure that solar systems can withstand wind loads, DE 202012 103392U1 discloses connecting individual support elements of the solar systems to one another. For this purpose, each support element has tabs on one end face and slot-shaped recesses on another end face. The tabs on one end face of the support element are designed to engage in recesses on another adjoining support element, resulting in a positive longitudinal connection of the support elements.

[0007] The support elements hold the solar panels at a predetermined angle relative to a support surface. For this purpose, the support elements each have two supports protruding from the base at different heights, on which the solar panels rest.

[0008] Despite this bond, further measures are required to anchor the retaining elements - for example, to avoid undesirable displacement, which, among other things, endangers the solar elements and can be promoted by lateral play between the recess and the tab, but also due to thermal expansion.

[0009] Description of the invention

[0010] The invention therefore has the object of modifying the design of a holding element of the prior art described at the outset in such a way that solar elements can be held securely with it.

[0011] The invention solves the problem by the features of claim 1.

[0012] If at least one recess and at least one tab are provided next to each other on the end faces, this can, among other things, mechanically strengthen the connection between two support elements by means of connecting elements with different functionalities. Furthermore, by providing two different connecting elements next to each other, the lateral accuracy of the connection can also be improved, ensuring precise alignment of the support elements – even when wind loads and / or thermal loads act on the support elements. The support element according to the invention can therefore securely hold solar panels.

[0013] In addition, this inventive design of the holding element can allow production as a deep-drawn sheet metal part with optimized material utilization, whereby the material and production costs can be significantly reduced.

[0014] This is particularly true if the metal sheet is a metallically coated, especially hot-dip coated, steel sheet. This metallic coating of the metal sheet can be created, in particular, by hot-dip galvanizing. Generally, it is mentioned that the recess can be designed as a recessed hole or thus hole-shaped, for example, also as an elongated hole. It is also conceivable that the recess and / or the tab are formed from the metal sheet.

[0015] Preferably, the holding element for lightning protection and / or earthing and / or equipotential bonding can have at least one contact tongue on at least one outer edge of the front side. This can create a comparatively easily accessible and stable option for integration into the lightning protection system of, for example, a building. This can also be used, for example, for earthing and / or equipotential bonding. This equalization can be achieved, for example, with another holding element, an adapter element, a grounding strap, a terminal, etc. This can ensure comparatively good current dissipation in the event of a lightning strike, even without the use of contact terminals known from the prior art.

[0016] For example, the retaining element has at least one contact tongue on the two outer edges of each end face. This allows the retaining element to be used for a wide variety of arrangements. #

[0017] It can be advantageous if one of the two contact blades has a bevel at its free end. This can facilitate contact with another contact blade.

[0018] For example, the contact tongue of the tab protrudes on the relevant end face, which can provide a sufficient contact surface.

[0019] Ease of handling can also be advantageous if the contact tongue extends essentially in one plane.

[0020] For a sufficient electrical power transmission for lightning protection, it can be advantageous, for example, if the cross-sectional area of ​​the contact tongue is greater than or equal to 12.5 mm 2 For example, the cross-sectional area of ​​the contact tongue is greater than or equal to 20 mm 2 This can, for example, enable lightning protection in accordance with DIN EN 62561-1.

[0021] Preferably, the steel sheet comprises a steel alloy with in each case in wt.%: 0.02 to 0.25, in particular 0.03 to 0.10, manganese (Mn), 0.01 to 0.10, in particular 0.02 to 0.05, aluminum (Al), 0.003 to 0.10, in particular 0.005 to 0.08, silicon (Si), 0.0010 to 0.0060, in particular 0.0020 to 0.0045, carbon (C), individually or in combination from the group:

[0022] 0.01 to 0.20, especially 0.02 to 0.10, niobium (Nb)

[0023] 0.01 to 0.20, in particular 0.02 to 0.10, titanium (Ti) and the remainder iron (Fe) as well as unavoidable impurities due to manufacturing.

[0024] This steel alloy can also optionally be used individually or in combination with the

[0025] Group:

[0026] < 0.2, especially < 0.10, molybdenum (Mo)

[0027] < 0.20, especially < 0.10, copper (Cu)

[0028] < 0.05, especially < 0.10, nitrogen (N)

[0029] < 0.02 phosphorus (P)

[0030] < 0.03 sulfur (S).

[0031] For example, the steel sheet is type DX54D according to VDA 239-100.

[0032] For example, the deep-drawability of the steel sheet used to produce the retaining element can be improved if the steel sheet has a ferritic structure. This allows for the creation of a particularly cost-effective and durable retaining element. This is especially true if the ferrite content in the structure is > 95%. For example, the ferrite content in the structure is > 99%. The remainder of the structure may contain precipitates such as niobium nitrides and / or titanium nitrides.

[0033] For example, comparatively high corrosion protection can be achieved if the metallic coating is zinc- or aluminum-based. This metallic coating can, in particular, be a ZM310 coating. An AZ185 coating can also be advantageous.

[0034] Preferably, the metallic coating has a layer thickness of at least 100 g / m 2 The stability of the retaining element can be further improved if this layer is greater than 300 g / m 2 is.

[0035] Corrosion protection can be further increased if the zinc-based metallic coating additionally contains aluminum and / or magnesium, each in a proportion of 1 to 5% by weight.

[0036] If the end faces each have a first half and a second half, with at least one recess arranged on the first half and at least one tab on the second half, the relative position of the retaining elements can be further improved. The functional reliability of the retaining element can therefore be further increased.

[0037] Preferably, on the end face of each recess on one half-side, a tab of the other half-side is arranged at the same normal distance from the longitudinal center axis of the holding element, in order to connect two holding elements according to the invention, which are aligned in opposite directions, to one another via their same end faces. This also makes it possible, for example, to easily align the holding elements. This feature can, among other things, further increase the torsional rigidity of the assembly of holding elements and thus the functional reliability. Preferably, the tab has a bent-up tab start towards the tab web and a tab end bent in the opposite direction to the tab start, wherein the recess is provided on a raised portion in the holding element, which raised portion forms a receptacle, accessible via the recess, for a tab end for hooking said tab into the receptacle.This design of the tab and recess allows them, as interacting parts of the connecting elements, to absorb thermal longitudinal expansion without stressing the connection. This ensures a positive fit and possibly also a frictional fit at the connection, which, according to the invention, can further increase stability.

[0038] The tab end may have at least one, preferably two, laterally projecting tabs to improve the mechanical connection.

[0039] The structural design of the holding element can be further simplified if the recesses are slot-shaped, in particular running transversely to the longitudinal central axis of the holding element.

[0040] Preferably, recesses and tabs are provided alternating next to each other on one end face. This makes it possible, among other things, to compensate for tolerances of the individual connecting elements – which can further improve the positioning accuracy of connected retaining elements and their alignment with each other.

[0041] Adequate support of the solar element to be carried can be ensured if the first and second supports are each provided in the vicinity of one end face of the holding element.

[0042] Compact dimensions can be achieved if the support element ends at the second support, which is higher than the first. This design also improves the stackability of the support element and thus makes it easier to transport.

[0043] The latter can be further improved if the base forms contact surfaces in front of the first support and between the first and second support in the longitudinal direction of the holding element.

[0044] Preferably, the base between the first and second supports is designed to ballast the holding element in order to secure the holding elements against wind forces.

[0045] If the base has several, preferably projecting, longitudinal beads, this can, for example, further increase the torsional rigidity of the holding element.

[0046] The ease of handling of the holding element when attaching solar elements can be improved if the first and / or second support has a positioning aid for the solar element and / or a cable fixation.

[0047] The holding element is particularly suitable for a simple and stable arrangement with multiple holding elements, with at least two holding elements being connected to each other via connecting elements on the same end faces. This arrangement of the holding elements is particularly suitable, for example, for an east-west orientation of the solar modules.

[0048] For earthing and / or potential equalization and / or lightning protection, the holding elements can overlap with their contact tongues and form a contact surface between them. This contact surface is, for example, flat. This allows the two holding elements to provide a sufficient contact surface on these end faces, for example. This ensures, among other things, reliable electrical discharge in the event of a lightning strike. Furthermore, an arrangement of several holding elements according to the invention in succession can prove advantageous, in which at least two holding elements are connected to one another via an adapter element, wherein the adapter element has connecting elements on its end faces that are complementary to those of the end faces of the two holding elements. In this way, all of the aforementioned advantages can be achieved.The arrangement of holding elements with an adapter element between these holding elements is advantageous when the solar modules are oriented towards the south.

[0049] For grounding and / or equipotential bonding and / or lightning protection, the retaining elements can overlap with a tongue of the adapter element, forming a contact surface between them. This contact surface can be flat, for example. This ensures, among other things, safe electrical discharge in the event of a lightning strike.

[0050] This arrangement preferably comprises at least two support elements and at least one solar element, in particular solar modules and / or solar collectors. The solar element rests on the supports of the two support elements, which are provided directly next to one another. The support elements can be provided directly next to one another at a distance from one another.

[0051] Preferably, the adjacent holding elements are electrically connected via an electrical conductor. This can be a rigid conductor, for example, although a flexible conductor is also conceivable. This electrically connects both holding elements, enabling a lightning current-carrying connection in accordance with DIN EN 62561-1.

[0052] The support element is particularly suitable for a solar system when a solar element, in particular solar modules and / or solar collectors, rests on the supports of the support element. Brief description of the drawings

[0053] The figures show, for example, the subject matter of the invention in more detail using several embodiments.

[0054] Fig. 1 is a three-dimensional view of a holding element according to a first embodiment,

[0055] Fig. 2 is a plan view of the holding element according to Fig. 1,

[0056] Fig. 3 an arrangement of two holding elements and solar elements,

[0057] Fig. 4 is a sectional detailed view of the connection between two holding elements of Fig. 3,

[0058] Fig. 4a and 4b Detailed views of the complementary connecting elements connected according to Fig. 4,

[0059] Fig. 5 shows a further arrangement of two holding elements, an adapter element and solar elements,

[0060] Fig. 6 a three-dimensional view of a solar system with several holding elements and solar elements,

[0061] Fig. 7 is a three-dimensional view of a holding element according to a second embodiment,

[0062] Fig. 7a a detailed view of contact tongues on one end face of the holding element according to Fig. 7 and

[0063] Fig. 8a and 8b three-dimensional views of electrical connections between two mechanically connected holding elements according to Fig. 7.

[0064] Way to implement the invention

[0065] Fig. 1, for example, shows an elongated holding element 1 made from an elongated metal sheet or sheet metal strip by sheet metal forming, in particular by deep drawing. This allows for comparatively cost-effective production. The holding element 1 is used to attach at least one solar element 2, for example a PV module, PVT module, solar collector, etc., to a building 3, as shown schematically in Fig. 3. For this purpose, the holding element 1 has an elongated base 4, which forms a flat support surface 5 for the holding element 1 on the building 3.In addition, the holding element 1 has two supports 6a, 6b for the solar element 2, which supports 6a, 6b of the base 4 protrude on the same base side—to different heights h1, h2 relative to the base side, which determines the angle of inclination of the solar element 2 relative to the support surface 5 based on the preferably common inclination of the particularly flat support surfaces of the supports 6a, 6b. One or two solar elements 2 can rest next to one another on these supports 6a, 6b, as can be seen, for example, in Fig. 2.

[0066] For the mechanical connection of the holding element 1 with, for example, another holding element 1, as shown in Fig. 3, the end faces 7a, 7b of the holding elements 1 have a plurality of recesses 8a, 8b in the form of elongated holes and a plurality of tabs 9a, 9b, which connecting elements 10 are formed for a positive interaction.

[0067] The recesses 8a, 8b and tabs 9a, 9b are integrally connected to the metal sheet or are formed by this metal sheet, as can be seen in Fig. 1.

[0068] According to the invention, two recesses 8a, 8b and two tabs 9a, 9b are arranged next to each other on each end face 7a, 7b, alternating next to each other, as can be seen, for example, in Fig. 1. Thus, two differently mechanically connectable connecting elements 10 are present on each end face 7a and 7b, which, while compensating for play, can form a precisely shaped and secure connection to the holding element 1. The holding element 1 is therefore suitable for securely holding solar elements 2 – even in conjunction with other holding elements 1 of the same design.

[0069] This is all the more so since the metal sheet is a metallically coated, namely hot-dip coated, steel sheet. The steel sheet is type DX54D with a steel alloy containing, in wt.% each, 0.0033 carbon (C), 0.01 silicon (Si), 0.11 manganese (Mn),

[0070] 0.04 aluminum (AI),

[0071] 0.002 niobium (Nb),

[0072] 0.045 titanium (Ti),

[0073] 0.0048 nitrogen (N),

[0074] 0.008 phosphorus (P),

[0075] 0.01 sulfur (S), and the remainder iron (Fe) as well as unavoidable impurities due to production.

[0076] This steel sheet has a ferritic structure with a ferritic content of 99% and residual titanium precipitates, which results in high durability of the retaining element. This is also due to the metallic coating, which is zinc-based, namely a ZM310 coating with a layer thickness of 300 g / m 2according to EN 10346.

[0077] As can be seen in Fig. 2, for example, two recesses 8a, 8b and two tabs 9a, 9b are provided on each end face 7a, 7b - namely one recess 8a or 8b and one tab 9a or 9b on a half-side H1 or H2 of an end face 7a or 7b - wherein a longitudinal center axis L of the holding element 1 divides the two end faces 7a, 7b into their half-sides H1 or H2.

[0078] In addition, a tab 9a or 9b is arranged for each recess 8a or 8b with the same normal distance N1 or N2 to the vertical longitudinal center plane Ei of the holding element 1, as shown on the end face 7a in Fig. 2, representative of both end faces 7a and 7b. This makes it possible to connect two holding elements 1 according to the invention, which are aligned in opposite directions to one another, via their same end faces 7a or 7b. Fig. 4 shows in more detail the design of a recess 8a and a tab 9a in the situation of interaction to form an at least positive connection between two holding elements 1.

[0079] Thus, each tab 9a, 9b has an upwardly bent tab beginning 11a and a tab end 11b bent in the opposite direction to the bent tab beginning 11a in the direction of the tab web 12. Between the bent tab beginning 11a and the tab end 11b there is a straight tab web 12, preferably parallel to the contact surface 5. Two laterally projecting tabs 13a, 13b are provided at the tab end 11b.

[0080] The recess 8a is provided on a raised portion 14, which protrudes at least in an adjoining region of the retaining element 1. The raised portion 14 thus forms a receptacle 15, accessible via the recess 8a, for a tab end 12 to be hooked into the receptacle 15. For this purpose, the recess 8a is slot-shaped and extends transversely to the longitudinal center axis L of the retaining element 1, which facilitates easy assembly of the retaining elements 1.

[0081] The first and second supports 6a, 6b are each provided in the vicinity of an end face 7a, 7b of the holding element 1, with the holding element 1 ending at the second support 6b, which protrudes above the first support 6a in height—i.e., in its distance from the base 4. This allows, for example, direct connection to another holding element 1, saving material.

[0082] The holding element 1 has a high level of stability due to the fact that the base 4 forms contact surfaces 5 in front of the first support 6a and between the first and second supports 6a, 6b, as seen in the longitudinal direction of the holding element 1. The contact surface 5 is also designed to ballast the holding element 1 with a weight 16. Despite this weight 16, the holding element 1 remains dimensionally stable, for which purpose the base 4 has several projecting and parallel longitudinal beads 17. In addition, the holding element 1 has a positioning aid 18 for the solar element 2 and a cable fixation 19 on the second support 6b, which considerably facilitates the installation of the solar element 2.

[0083] For this purpose, the positioning aid 18, which is preferably provided centrally on the respective support 6a, 6b, is designed as a stop projecting from this support 6a, 6b for one side of the solar element 2.

[0084] As can be seen in Fig. 3, several holding elements 1 are arranged one after the other and connected to one another via their connecting elements 10 – for which purpose, the same end faces 7b of the two holding elements 1 (or of the first holding element 1 and the second holding element 1) are aligned with one another. This allows an at least positive connection to be created via the connecting elements of the same end faces 7b, 7b – or solar elements 2 can be attached with different orientations. This is particularly suitable, for example, for an east-west orientation of the solar elements 2, thus forming a solar system 20.

[0085] A consistent orientation of the solar elements 2 is made possible by providing an adapter element 100 between one end face 7a of the first holding element 1 and the other end face 7b of the second holding element 1 - see Fig. 5. For this purpose, the adapter element 100 has complementary connecting elements 110 for connecting the holding elements 1 at their different end faces 7a, 7b. If a south-facing orientation of the solar elements 2 is desired, this arrangement is preferably selected to form a solar system 21.

[0086] In each of the two solar systems 20, 21, a solar element 2 rests on two holding elements 1 provided directly next to one another and running parallel, on their supports 6a, 6b, as shown, for example, in Fig. 6 for the solar system 20. The holding elements 1, which are connected to one another, are thus arranged in rows R1, R2 with a distance A between these rows R1, R2. These rows R1, R2 have sufficient free space on the respective supports 6a, 6b to be able to support additional solar elements 2 (not shown). The solar system 20, 21 can therefore be extended as desired in the longitudinal and width directions.

[0087] Fig. 7 shows a holding element 101 according to a second embodiment. This holding element 101 differs from the holding element 1 shown in Fig. 1 by additional contact tongues 22a, 22b, 22c, 22d, allowing integration into a building's lightning protection system. They can also be used to create grounding and / or equipotential bonding. These contact tongues 22a, 22b, 22c, 22d are shown enlarged in Fig. 7a and are located on both end faces 7a, 7b of the holding element 101, specifically on the outer edges 23a, 23b of the end face 7a, 7b. By arranging them at the left and right ends of the end faces 7a, 7b, a comparatively easily accessible and stable option for grounding and / or equipotential bonding of the holding element 101 is provided.

[0088] The contact tongues 22a, 22b, 22c, 22d have a cross-sectional area of ​​at least 21 mm 2The cross-sectional area is calculated from the respective width of the contact tongues 22a, 22b, 22c, 22d of 30 mm multiplied by the corresponding sheet thickness of 0.7 mm each. This cross-sectional area is thus comparatively large in order to enable low electrical resistance for the dissipation of high electrical energy. Thus, the holding element 101 can fulfill all requirements for integration into the lightning protection system according to DIN EN 62561-1. A cross-sectional area of ​​greater than or equal to 12.5 mm is preferred. 2 , in particular greater than or equal to 20 mm 2 , over the entire length of the contact tongues 22a, 22b, 22c, 22d.

[0089] The contact tongues 22a, 22b, 22c, 22d, which extend essentially in one plane, also protrude from the tabs 9a, 9b on the respective end face 7a, 7b, which facilitates their contacting in a wide variety of arrangements 20, 21, of which arrangement 20 is shown in Figures 8a and 8b. The contact tongues 22a, 22b, 22c, 22d are—as shown—rectangular in plan view. On both end faces 7a and 7b, one of the two contact tongues 22a and 22d is provided with a bevel 27 at its free end to facilitate the arrangement of the holding element 101.

[0090] According to Fig. 8a and 8b, the respectively connected holding elements 101 overlap with their contact tongues 22a, 22b, which forms a sufficient contact area between these three illustrated holding elements 101. Thus, according to Fig. 8a, a first and a second holding element 101 are mechanically connected to one another at their first end faces 7a via the connecting elements 10 and electrically connected to one another in a lightning current-carrying manner via the contact tongues 22a, 22b. According to Fig. 8b, the second and a third holding element 101 are mechanically connected to one another at their second end faces 7b via the connecting elements 10 and electrically connected to one another via the contact tongues 22c, 22d.

[0091] The respective overlap of the contact tongues 22a, 22b forms a flat contact surface Ka between them, which ensures a particularly low electrical resistance between the respective holding elements 101. Therefore, a potential shift is not to be expected, which also creates a lightning current-carrying connection according to DIN EN 62561-1. Another advantage is that the metal sheet of the holding elements 101 is a metallically coated steel sheet.

[0092] The contact surfaces Ka are secured by a screw connection 24, namely a screw 24a and a nut 24b. The screw connection 24 penetrates the holes 25 of the respective contact tongues 22a, 22b, 22c, 22d. This ensures comparatively good current dissipation in the event of a lightning strike – even without the use of contact terminals known from the prior art. It is conceivable that, instead of the screw connection 24, a terminal is pushed onto the two contact tongues 22a, 22b, 22c, 22d. An opening with corresponding dimensions is conceivable to secure this terminal to the holding elements.

[0093] In addition, the rows R1, R2 on holding elements 1, 101 are short-circuited via an electrical and rigid conductor 25, as shown in Fig. 6 for the holding elements 1, for example. However, a flexible conductor, not shown, is also conceivable. The electrical conductor 25 is electrically connected to the respective holding element 1 via a clamping screw connection 26. This electrically connects both holding elements to one another, enabling a lightning current-carrying connection in accordance with DIN EN 62561-1.

[0094] In general, it is noted that "in particular" can be translated into English as "more particularly." A feature preceded by "in particular" is to be considered an optional feature that can be omitted and thus does not constitute a limitation, for example, of the claims. The same applies to "vorzugsweise," translated into English as "preferably."

Claims

Patent claims: 1 . Holding element made of a metal sheet for at least one solar element (2), in particular a solar module and / or solar collector, with a base (4) forming a support surface (5) for the holding element (1, 101), with two supports (6a, 6b) for the solar element (2) projecting from the base (4) to different heights, and with connecting elements (10) provided on end faces (7a, 7b) of the holding element (1, 101), which have at least one, in particular hole-shaped, recess (8a, 8b) and at least one tab (9a, 9b), which tab (9a, 9b) is shaped for insertion into such a recess (8a, 8b), characterized in that at least one recess (8a, 8b) and at least one tab (9a, 9b) are provided next to one another on the end faces (7a, 7b), wherein the Metal sheet is a metallically coated, in particular hot-dip coated, steel sheet.

2. Holding element according to claim 1, characterized in that the holding element (1, 101) has at least one contact tongue (22a, 22b, 22c, 22d) for lightning protection and / or earthing and / or potential equalization on at least one outer edge (23a, 23b) of the end face (7a, 7b).

3. Holding element according to claim 2, characterized in that the holding element (1, 101) has at least one contact tongue (22a, 22b, 22c, 22d) on the two outer edges (23a, 23b) of each end face (7a, 7b), 4. Holding element according to claim 3, characterized in that one of the two contact tongues (22a, 22d) has a bevel (27) at its free end on one end face (7a, 7b).

5. Holding element according to claim 2, 3 or 4, characterized in that the contact tongue (22a, 22b, 22c, 22d) of the tab (9a, 9b) protrudes on the relevant end face (7a, 7b) and / or extends substantially in one plane.

6. Holding element according to claim 2, 3, 4 or 5, characterized in that the cross-sectional area of ​​the contact tongue (22a, 22b, 22c, 22d) is greater than or equal to 12.5 mm 2 , in particular greater than or equal to 20 mm 2 , is.

7. Holding element according to one of claims 1 to 6, characterized in that the steel sheet is a steel alloy with in each case in wt.% 0.02 to 0.25, in particular 0.03 to 0.10, manganese (Mn), 0.01 to 0.10, in particular 0.02 to 0.05, aluminum (Al), 0.003 to 0.10, in particular 0.005 to 0.08, silicon (Si), 0.0010 to 0.0060, in particular 0.0020 to 0.0045, carbon (C), individually or in combination from the group: 0.01 to 0.20, especially 0.02 to 0.10, niobium (Nb) 0.01 to 0.20, in particular 0.02 to 0.10, titanium (Ti) optionally individually or in combination from the group: < 0.2, especially 0.10, molybdenum (Mo) < 0.20, especially 0.10, copper (Cu) < 0.05, especially 0.10, nitrogen (N) < 0.02 phosphorus (P) < 0.03 sulfur (S) and the remainder iron (Fe) as well as unavoidable impurities due to production.

8. Holding element according to one of claims 1 to 7, characterized in that the steel sheet is of type DX54D according to VDA 239-100.

9. Holding element according to one of claims 1 to 8, characterized in that the steel sheet has a ferritic structure.

10. Holding element according to claim 9, characterized in that the proportion of ferrous metal in the structure is > 95%, in particular > 99%, the remainder being precipitations.

11. Holding element according to one of claims 1 to 10, characterized in that the metallic coating has a zinc base or aluminum base, in particular a ZM310 or AZ185 coating.

12. Holding element according to one of claims 1 to 11, characterized in that the metallic zinc-based coating additionally contains aluminum and / or magnesium, each with 1 to 5% by weight.

13. Holding element according to one of claims 1 to 12, characterized in that the metallic coating has a layer thickness of at least 100 g / m 2 , especially greater than 300 g / m 2 has.

14. Holding element according to one of claims 1 to 13, characterized in that the end faces (7a, 7b) each have a first half-side (H1) and a second half-side (H2), wherein at least one recess (8a, 8b) is arranged on the first half-side (H1) and at least one tab (9a, 9b) is arranged on the second half-side (H2).

15. Holding element according to one of claims 1 to 14, characterized in that on the end face (7a, 7b) for each recess (8a, 8b) of one half-side (H1, H2) a tab (9a, 9b) of the other half-side (H1, H2) is arranged with the same normal distance (N1, N2) to the longitudinal center axis (L) of the holding element (1, 101).

16. Holding element according to one of claims 1 to 15, characterized in that the tab (9a, 9b) has a bent-up tab start (11a) in the direction of the tab web (12) and a tab end (11b) bent in the opposite direction to the tab start (11a), and in that the recess (8a, 8b) is provided on a raised portion (14) in the holding element (1, 101), which raised portion (14) forms a receptacle (15) accessible via the recess (8a, 8b) for a tab end (11b) for hooking it into the receptacle (15).

17. Holding element according to claim 16, characterized in that the tab end (11 b) has at least one, preferably two, laterally projecting tabs (13a, 13b).

18. Holding element according to one of claims 1 to 17, characterized in that the recesses (8a, 8b) are slot-shaped, in particular extending transversely to the longitudinal central axis (L) of the holding element (1, 101).

19. Holding element according to one of claims 1 to 18, characterized in that recesses (8a, 8b) and tabs (9a, 9b) are provided alternately next to one another on an end face (7a, 7b).

20. Holding element according to one of claims 1 to 19, characterized in that the first and second supports (6a, 6b) are each provided in a close region of an end face (7a, 7b) of the holding element (1, 101).

21. Holding element according to one of claims 1 to 20, characterized in that the holding element (1, 101) ends at the second support (6b), which second support (6b) projects beyond the first support (6a) in height.

22. Holding element according to one of claims 1 to 21, characterized in that the base (4) forms contact surfaces (5) in front of the first support (6a) and between the first and second support (6b) in the longitudinal direction of the holding element (1, 101).

23. Holding element according to one of claims 1 to 22, characterized in that the base (4) between the first and second support (6a, 6b) is designed to ballast the holding element (1, 101).

24. Holding element according to one of claims 1 to 23, characterized in that the base (4) has several, preferably projecting, longitudinal beads (17).

25. Holding element according to one of claims 1 to 24, characterized in that the first and / or second support (6b) has a positioning aid (18) for the solar element (2) and / or a cable fixation (19).

26. Arrangement with a plurality of holding elements (1, 101) according to one of claims 1 to 25, wherein at least two holding elements (1, 101) are connected to one another via the connecting elements (10) of the same end faces (7b).

27. Arrangement according to claim 26, characterized in that the holding elements (101) overlap with their contact tongues (22a, 22b, 22c, 22d) and form a contact surface (Ka), in particular a planar one, between them.

28. Arrangement of several holding elements (1, 101) according to one of claims 1 to 25, wherein at least two holding elements (1, 101) are connected to one another via an adapter element (100), wherein for this purpose the adapter element (100) has connecting elements (110) on its end faces which are designed to be complementary to those of the end faces (7a, 7b) of the two holding elements (1, 101).

29. Arrangement according to claim 28, characterized in that the holding elements (101) with their contact tongues (22a, 22b, 22c, 22d) each overlap with a tongue of the adapter element (100) and form a, in particular flat, contact surface (Ka) between them.

30. Arrangement with at least two holding elements (1, 101) according to one of claims 1 to 25, and with at least one solar element (2), in particular solar modules and / or solar collector, wherein the solar element (2) rests on the supports (6a, 6b) of the two holding elements (1, 101) provided directly next to one another.

31. Arrangement according to claim 30, characterized in that the holding elements (1, 101) provided next to one another are electrically connected via an electrical, in particular rigid, conductor (25).

32. Solar system with an arrangement according to one of claims 26 to 31.

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