Solar power generation equipment

Abstract

To provide a photovoltaic power generation device which can make a power generation amount per installation area larger than the power generation amount of a photovoltaic power generation device having one photovoltaic power generation panel provided on a flat surface, which can irradiate the photovoltaic power generation panel with sunlight incident from various angles, and which can effectively utilize the space in a three-dimensional manner.SOLUTION: A photovoltaic power generation device comprises a plurality of polyhedra 1, and photovoltaic power generation panels 3 that are provided on two or more surfaces of each of the polyhedra 1. The polyhedra 1 are connected together via vertices 2a of the polyhedra 1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a photovoltaic power generation device having a photovoltaic power generation panel on the surface of a polyhedron. [Background technology]

[0002] In recent years, the demand for power generation systems using solar panels has been increasing. Conventional solar panels are large in size relative to the amount of power they generate. The amount of power generated by solar power generation systems that have solar panels installed in a planar manner is proportional to the number of solar panels and the panel area, so a relatively large installation area is required from the perspective of power generation efficiency and economics, and they tend to be large in size. Solar power generation is originally generated by utilizing sunlight, which is a natural energy source, but in recent years, problems have surfaced with the construction of large-scale fixed mega solar power plants, such as the need to cut down forests to secure vast installation sites, which has led to opposition from local residents in terms of environmental conservation and disaster prevention, and local governments are moving to restrict development that involves deforestation. On the other hand, interest in global environmental issues and energy conservation is increasing, and there is no time to spare in order to achieve the so-called 2050 carbon neutrality, which aims to reduce greenhouse gas emissions to zero by 2050. As one measure, discussions are also being held on making the installation of solar panels mandatory on newly built homes.

[0003] From sunrise to sunset, when solar power generation is possible, the position of the sun moves due to the rotation of the earth, and the direction and angle of sunlight change over time, making it difficult to ensure that sunlight is stably incident on the solar cell panel. This is because the power generation efficiency decreases as the angle of incidence of sunlight on the solar cell panel increases.

[0004] Portable solar power generation devices have been developed (see Patent Document 1). However, a solar cell panel that is vertically disposed on the side of a cylindrical shape has a problem in that the angle of incidence of sunlight during the day becomes large, reducing the power generation efficiency. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-16619 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above background, and an object of the present invention is to provide a solar power generation system that can generate a larger amount of power per installation area than conventional solar power generation systems, has solar power generation panels disposed in positions where they can be irradiated with sunlight incident from various angles, and can effectively utilize space in a three-dimensional manner.

[0007] A solar power generation device according to one embodiment of the present invention includes a plurality of polyhedrons and a solar power generation panel provided on two or more surfaces of each of the polyhedrons, the polyhedrons being connected at their vertices. The support unit further includes a support section for supporting the polyhedron, the support section supporting one or more diagonal vertices of the polyhedron by sandwiching them together, the support section having a support bar for supporting the diagonal vertices of the polyhedron by sandwiching them together, and a support adjustment section connected to the support bar and in contact with two diagonal vertices of the polyhedron, the support adjustment section changing its position and attitude to adjust the attitude and position of the polyhedron.

[0008] The above configuration has the advantage of being able to generate more power per installation area than a solar power generation system with one solar power generation panel on a flat surface. This is because solar power generation panels are provided on multiple surfaces of the polyhedron, and the solar power generation panels provided on each surface, including not only the upper surface of the polyhedron but also other surfaces, can generate power. In addition, by providing solar power generation panels on multiple surfaces of the polyhedron, it is possible to efficiently generate power on any of the surfaces from sunlight incident from various angles. This is because sunlight can be efficiently incident on any of the surfaces of the polyhedron facing various positions, angles, and directions, regardless of the altitude and direction of the sun during the sun's daylight hours. The above configuration has the advantage of being able to generate more power per installation area than a single polyhedron. For example, by arranging multiple polyhedrons in a vertical direction, it is possible to generate power on the surfaces of each polyhedron, and it is also possible to indirectly irradiate sunlight reflected on the surfaces of other polyhedrons.

[0009] In addition, the above-mentioned configuration has the advantage that the amount of power generated per installation area can be increased compared to conventional solar power generation in which solar panels are installed on the surface of a cylinder or column. By connecting multiple polyhedrons at their vertices, the side surfaces of multiple polyhedrons connecting the vertices of the connected polyhedrons with the other vertices can be made uneven, unlike the flat side surfaces of a cylinder or prism, and the surface area of ​​the polyhedron on which the solar panels are installed can be increased. In addition, the surface of the polyhedron on which the solar panels are installed can be inclined horizontally rather than vertically, thereby increasing the amount of power generated. For example, if the polyhedron is a cube, each upper surface of the cube will be inclined at 45 degrees upward, and power can be generated more efficiently when sunlight enters from above during the day.

[0010] Furthermore, the above configuration has the advantage that the parts of the polyhedron other than the surface directly irradiated with sunlight can suppress the decrease in power generation due to temperature rise. By making the polyhedron a solid body with thickness and volume, the effect of suppressing the temperature rise in the parts of the polyhedron other than the surface directly irradiated with sunlight is greater than that of a flat plate. Furthermore, the above configuration has the advantage that by arranging multiple polyhedrons in a vertical direction, for example, the power generation per installation area can be increased and space can be used three-dimensionally, and particularly small spaces can be effectively used three-dimensionally.

[0011] In a solar power generation device according to another embodiment of the present invention, the polyhedron is a hexahedron.

[0012] In a solar power generation device according to another embodiment of the present invention, each face of a polyhedron is a quadrangle having four right angles.

[0013] A solar power generation device according to another embodiment of the present invention further includes a support portion for supporting the polyhedron, and the support portion supports one or more polyhedrons by sandwiching vertices on diagonals of the polyhedron.

[0014] The above configuration has the advantage of being able to increase the amount of power generated per installation area. This is because by supporting the polyhedron by sandwiching two diagonal points, the area in contact with the polyhedron is reduced, without reducing the installation area of ​​the solar panel, and the shadow that blocks sunlight can be reduced. The above configuration also has the advantage of being able to stably support the polyhedron. This is because two vertices located on the diagonal of one or more polyhedrons are supported by sandwiching them from both sides. The above configuration also makes it easy to set the polyhedron in a specified position, and allows fine adjustment of the attitude, angle, position, etc. of the polyhedron. This is because the support parts can support the polyhedron by sandwiching the vertices located on the diagonal of the polyhedron.

[0015] In a solar power generation device according to another embodiment of the present invention, a support unit has a support bar that sandwiches and supports the diagonal vertices of a polyhedron, and a support adjustment unit that is connected to the support bar and contacts the two diagonal vertices of the polyhedron. The support adjustment unit can change its position and attitude to adjust the attitude and position of the polyhedron.

[0016] The above configuration has the advantage that the polyhedron can be adjusted to the optimal position, increasing the amount of power generation per installation area. This is because the support adjustment unit can change its position and attitude, the width between the two support adjustment units, the positional relationship between the two support adjustment units, and the contact state with the vertices of the polyhedron, allowing fine adjustment of the attitude, direction, and position of the polyhedron. Furthermore, the above configuration makes it easy to perform other tasks, such as connecting wiring and adjusting the attitude of the polyhedron, after first installing the polyhedron in a specified position. The polyhedron can be easily installed, removed, and replaced, resulting in a structure that is convenient for maintenance, assembly, disassembly, and transportation.

[0017] A solar power generation device according to another embodiment of the present invention is In addition to the above aspects, At least one ventilation hole must be provided above the polyhedron. It is possible.

[0018] The above-mentioned configuration has the advantage of being able to prevent a decrease in power generation efficiency due to an excessive temperature rise in the solar cell module. This is because the air entering and exiting through the ventilation holes brings the temperature inside the polyhedron closer to the outside air temperature, thereby preventing an excessive temperature rise in the polyhedron.

[0019] In a solar power generation device according to another embodiment of the present invention, a face of a polyhedron and a face of another adjacent polyhedron are arranged in a planar non-parallel state.

[0020] The above configuration has the advantage that sunlight can be irradiated from different directions onto the solar panels on each of the faces of the multiple polyhedrons, and the amount of power generated can be greater than that of a single polyhedron. This is because a certain face of a certain polyhedron and a face of another adjacent polyhedron are arranged in a non-parallel state, so that each face of the polyhedron is arranged facing a different direction, and any face can efficiently generate power from sunlight whose irradiation direction and irradiation angle change over time. The above configuration has the advantage that the change in the amount of power generated can be reduced and power generated can be stably generated compared to when a certain face of a polyhedron composed of multiple polyhedrons of the same shape and size and a corresponding face of the adjacent polyhedron are arranged in a parallel state. When a certain face of a certain polyhedron and a corresponding face of the adjacent polyhedron are arranged in a parallel state, a certain face of a certain polyhedron and a corresponding face of the adjacent polyhedron are arranged in a parallel state, so that the amount of power generated by the certain polyhedron and the adjacent polyhedron increases or decreases in the same way depending on the irradiation direction and irradiation angle of the sunlight. In contrast, when a certain face of a polyhedron and a face of another adjacent polyhedron are positioned in a planar non-parallel state, each face of the polyhedron is arranged facing a different direction, and one of the faces can efficiently generate power from sunlight whose irradiation direction and irradiation angle change over time, so the extent of the decrease in the amount of power generated can be reduced. Also, indirectly irradiating the angle of sunlight reflected by the face of another polyhedron with unevenness depending on the face can also contribute to reducing the extent of the decrease in the amount of power generated.

[0021] In a solar power generation device according to another embodiment of the present invention, the polyhedrons are connected to each other on a straight line.

[0022] In a solar power generation device according to another embodiment of the present invention, the connection positions of the polyhedrons are located on diagonals of the polyhedrons.

[0023] The above configuration has the advantage that the amount of electricity generated per installation area can be increased compared to a solar power generation system with one solar panel on a flat surface, or a solar power generation system with one face of a polyhedron placed parallel to the ground with one face facing down. First, the area in which the lower polyhedron is shaded by the upper polyhedron can be reduced. This is because the connection positions of the polyhedrons are located at the vertices of the diagonal of the polyhedrons, so that the faces adjacent to the vertices do not intersect perpendicularly to the diagonal line but at an angle. For example, if multiple cubes are lined up vertically and the diagonal line of the connection positions extends vertically, the faces adjacent to this vertex will be inclined at 45 degrees upward or downward from the vertical direction. Second, this is because it does not create dead spaces that are completely shaded and do not generate electricity, as occurs with the underside of a flat solar power generation panel, or the underside of a polyhedron when one face of the polyhedron is installed on the installation surface. For example, when multiple cubes are arranged vertically, the face adjacent to the lower vertex of the lowest polyhedron will also intersect at an angle to the vertical diagonal line, so it will not be completely shaded.

[0024] A solar power generation device according to another embodiment of the present invention is configured such that polyhedrons are connected at their vertices via connecting shafts, the connecting shafts penetrating the polyhedrons.

[0025] The above configuration has the advantage of being able to increase the amount of power generation per installation area. For example, in the case of polyhedrons stacked vertically, the area where the shadow of the upper polyhedron falls on the lower polyhedron can be reduced. In addition, the load-bearing capacity and strength of each polyhedron can be improved, allowing the polyhedrons to be stably fixed and supported in a predetermined attitude and position. Another advantage is that multiple polyhedrons can be stably fixed. This is because the connecting shaft that passes through the diagonals of the polyhedrons not only connects the multiple polyhedrons, but can also be used as a shaft to support the polyhedrons.

[0026] A solar power generation device according to another embodiment of the present invention is configured such that vertices of polyhedrons are connected via connecting shafts, and the connecting shafts are hollow.

[0027] The above configuration has the advantage that it is possible to prevent the air flow inside the hollow connecting shaft, which causes the tunnel effect to cause the solar panels to heat up and reduce the power generation efficiency. In addition, the electrical wiring can be placed inside the connecting shaft, protecting the wiring from physical and external obstacles and improving the external design.

[0028] A solar power generation device according to another embodiment of the present invention comprises polyhedrons connected at their vertices via a connecting shaft, with a female thread provided on either the vertex side to which the polyhedrons are connected or the connecting shaft side, and a male thread provided on the other side, with the male thread being inserted into the female thread, so that the polyhedrons are connected at their vertices via the connecting shaft.

[0029] The above-mentioned configuration allows easy attachment and detachment, and realizes a polyhedron that can be placed in various positions with a simple structure.

[0030] A solar power generation device according to another embodiment of the present invention has a plurality of polyhedrons arranged in the vertical direction.

[0031] The above configuration has the advantage of being able to generate more power per installation area. This is because sunlight can be irradiated onto any of the faces of the polyhedrons during the sun's daylight hours, regardless of the altitude or direction of the sun. In addition, compared to a case where one face of multiple polyhedrons is horizontally arranged close to each other with no space between them, by arranging multiple polyhedrons vertically and connecting them at their vertices, the area of ​​the shadow cast by the upper polyhedron on the lower polyhedron can be reduced. The above configuration has the advantage of being able to generate more power per installation area than a single polyhedron. This is because electricity can be generated on each face of each polyhedron, and sunlight reflected from the faces of other polyhedrons can also be indirectly irradiated. In addition, by arranging multiple polyhedrons vertically, the space can be utilized three-dimensionally, and particularly, a small space can be utilized effectively three-dimensionally.

[0032] A solar power generation device according to another embodiment of the present invention has a plurality of polyhedrons connected together with spaces therebetween.

[0033] The above configuration has the advantage of being able to increase the amount of power generated per installation area. Sunlight can be irradiated onto the surface of any of the polyhedrons, regardless of the altitude or direction of the sun. When multiple polyhedrons are arranged one above the other, the area of ​​the shadow of the upper polyhedron that falls on the lower polyhedron can be reduced. In addition, the diversity of designs can be expanded.

[0034] A solar power generation device according to another embodiment of the present invention has a polyhedron attitude changing mechanism for changing the attitude of the polyhedron.

[0035] The above configuration has the advantage of being able to increase the amount of power generated per installation area. By changing the position of the polyhedron by rotating, moving it up and down, tilting it, or a combination of these, it is possible to reduce the portion in shadow to a specified time or less, to irradiate the entire polyhedron with sunlight evenly, to increase the portion that is directly irradiated, to adjust the angle of incidence, and to increase the area and time during which power can be generated more efficiently. In addition, by irradiating sunlight evenly, it is possible to suppress excessive temperature rise of the solar power generation panel.

[0036] A solar power generation device according to another embodiment of the present invention further includes a reflector having a mirror surface that reflects sunlight, and the reflector causes the sunlight to irradiate the polyhedron.

[0037] The above configuration has the advantage of being able to increase the amount of power generated per installation area. This is because in addition to the sunlight being directly irradiated onto the polyhedron, the sunlight reflected by the reflector can be irradiated onto the polyhedron. This allows the reflected light to be irradiated onto the areas in shadow, and also increases the amount of light irradiated onto the areas that are directly irradiated.

[0038] A solar power generation device according to another embodiment of the present invention has a reflector position changing mechanism that changes the position of a reflector.

[0039] The above configuration has the advantage of being able to increase the amount of power generated per installation area, because it is possible to change the area and angle at which sunlight is reflected by the reflector and irradiated onto the polyhedron, so that it can be reflected more efficiently onto shaded areas, so that sunlight can be irradiated evenly over the entire polyhedron, and the area and time during which power can be generated more efficiently can be increased.

[0040] A solar power generation device according to another embodiment of the present invention further comprises one or more batteries that can be charged by power from the solar power generation panel. [Brief description of the drawings]

[0041] [Figure 1] 1 is a schematic side view showing a solar power generation device according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic side view showing an example of a solar power generation device in which the faces of cubes are arranged in a planar non-parallel state to the faces of adjacent cubes. [Diagram 3] 1 is a schematic side view showing an example of a solar power generation device in which a support portion has a support adjustment portion. [Figure 4] 4A to 4C are schematic cross-sectional views showing examples of a connecting shaft and a support portion. [Diagram 5] FIG. 13 is a schematic perspective view showing an example of an arrangement of a plurality of polyhedrons. [Figure 6] FIG. 11 is a schematic perspective view showing a solar power generation device according to another embodiment of the present invention. [Figure 7] FIG. 1 is a schematic perspective view showing an example of a solar power generation device equipped with a reflector. [Figure 8] FIG. 11 is a schematic perspective view showing a solar power generation device according to another embodiment of the present invention. [Figure 9] FIG. 11 is a schematic perspective view showing a solar power generation device according to another embodiment of the present invention. [Figure 10] FIG. 13 is a schematic perspective view showing an example of a reflector position changing mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] Hereinafter, an embodiment of the solar power generation device of the present invention will be described based on the drawings. However, the embodiment shown below is an example for embodying the technical idea of ​​the present invention, and the present invention is not limited to the following. In addition, this specification never specifies the members shown in the claims to the members of the embodiment. In particular, the dimensions, materials, shapes, and relative positions of the components described in the embodiment are not intended to limit the scope of the present invention to those, and are merely explanatory examples, unless otherwise specified. Note that the size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. Furthermore, in the following explanation, the same name and symbol indicate the same or similar members, and detailed explanation will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured as a form in which multiple elements are composed of the same member and one member serves multiple elements, or conversely, the function of one member can be shared by multiple members. [Embodiment 1]

[0043] 1 to 5 show a solar power generation device 100 according to a first embodiment of the present invention. Fig. 1 shows a schematic side view of the solar power generation device 100, Fig. 2 shows a schematic side view of the solar power generation device 100 in an example in which the faces of the cubes 2 are arranged in a planar non-parallel state to the faces of the adjacent cubes 2, Fig. 3 shows a schematic side view of the solar power generation device 100 in an example in which the support portion 20 has a support adjustment portion 23, Fig. 4 shows a schematic cross-sectional view of an example of a connecting shaft 5 and a support bar 21, and Fig. 5 shows a schematic cross-sectional view of an example of an arrangement of a plurality of polyhedrons 1.

[0044] The solar power generation device 100 according to the first embodiment of the present invention comprises a plurality of cubes 2 and a support portion 20 for supporting the cubes 2, with a solar power generation panel 3 provided on each face of each cube 2 and connected at the vertices 2a of the cubes 2. (1 polyhedron, 2 cubes)

[0045] In the present invention, the polyhedron 1 is a solid surrounded by a plurality of flat or curved surfaces, and each face is connected by the edges and / or vertices of the polyhedron 1. The polyhedron 1 can be a regular polyhedron in which each face is a regular polygon of the same shape and area, such as a cube, for example, a regular tetrahedron, regular hexahedron, regular octahedron, regular dodecahedron, or regular icosahedron. By making the polyhedron 1 a regular polyhedron, it is possible to provide solar panels evenly on each face. However, it is also possible to make the polyhedron 1 a polyhedron in which each face is not a regular polygon or is composed of polygons that do not have the same area or shape, such as a rectangular parallelepiped other than a cube. In the present invention, a rectangular parallelepiped refers to a rectangular parallelepiped in which all faces are rectangular (a square is also considered to be a type of rectangle) and adjacent faces intersect at right angles. A rectangular parallelepiped also includes a cube in which all six faces are square. Making the faces of the polyhedron 1 flat makes it easier to install the solar panels 3. However, some or a part of the faces of the polyhedron can be curved. For example, the edges or vertices of the polyhedron can be rounded by chamfering. Also, unevenness can be provided on the surface of all or a part of the faces of the polyhedron. Also, a part of the vertex 2a that connects the polyhedron 1 to the support part 20 or another polyhedron 1 can be cut off. In the solar power generation device 100 including FIG. 1, the polyhedron 1 is a cube 2. The same applies to the following embodiments. However, the polyhedron 1 of the present invention is not limited to the cube 2.

[0046] The cube 2 shown in FIG. 1 is surrounded by six square planes. The cube 2 can be assembled by attaching the photovoltaic power generation panel 3 on a base plate. The cube 2 can also be assembled by connecting six panel plates on which the photovoltaic power generation panel 3 is provided. Furthermore, the cube 2 can be made by attaching the six planes using the connecting parts or framework of the panel plates, or by inserting the six planes into the framework. Furthermore, the base plate of the cube 2 can be assembled by folding and connecting the planes. For example, a rectangular flat plate can be folded into a U-shape to form three faces and two pairs can be combined, or a rectangular flat plate can be folded into an L-shape to form two faces and three pairs can be combined. The cube 2 is surrounded by six planes, making it easy to attach panels to each face, and has a shape that is easy to give strength to because two faces are connected at right angles at each side and three faces are connected at right angles at each vertex, making it easy to manufacture and low cost.

[0047] In the cube 2 shown in Fig. 1, electric wires from the solar panel 3 are wired inside the cube 2. Although not shown, all or part of the electric wires from the solar panel can be arranged outside the cube. In this case, for example, the electric wires can be arranged along the sides of the cube, or wiring openings can be provided in parts other than the vertices where the cubes are connected, such as vertices, sides, or faces, or the like, and connection can be made possible using connectors, etc., making maintenance, replacement, and assembly easier.

[0048] Although not shown, the cube can be installed so that one or more faces can be opened or closed. If lead wires are wired inside the cube 2, it can be used conveniently for maintenance. In addition, by making one or more faces removable, it is possible to easily replace each face when a malfunction, dirt, or other problem occurs on one of the faces.

[0049] The amount of solar radiation is at its maximum when the sun is directly south at noon, so it is desirable to install flat solar panels facing south. The difference in power generation depending on the orientation of the solar panels is about 85% when facing west and east, about 60-65% when facing north, and about 96% when facing southeast and southwest, assuming that facing south is 100%. The amount of power generated can be maximized by installing solar panels perpendicular to the sunlight. In general, assuming that the direction and altitude of the sun will change, and considering Japan's latitude (35 degrees north in the center of Japan), it is considered desirable to install flat solar panels at an angle of about 30 degrees. If the installation angle is 30 degrees facing due south, the amount of power generated will only decrease by about 1-2% even if the installation angle is changed between 20 and 40 degrees, but if it is vertical (90 degrees), it will decrease by about 30-40%. In addition, the maximum amount of sunlight can be utilized by tilting the solar panel at 0 to 5 degrees around the summer solstice and at 55 to 65 degrees around the winter solstice. However, there are regional differences in both cases.

[0050] Solar power generation is proportional to the intensity of sunlight and the amount of solar radiation. When a panel is in a shadow, the amount of light decreases, and the amount of power generation decreases. The area of ​​the shadow, the time it is covered in the shadow, and the density of the shadow affect the power generation. The area of ​​the shadow affects the entire panel connected in series, so the amount of power generation can decrease by more than the value proportional to the area of ​​the shadow. Regarding the time it is covered in the shadow, the impact is small if it is a short, temporary shadow, but if it is in the shadow for a long time, the impact of the shadow is large. Regarding the density of the shadow, if the panel is covered by something or there is no sunlight at all, such as on a surface in contact with the ground, and a deep shadow is created, the power generation will be almost zero, but if a light shadow is created, the impact varies depending on the shade. The shade of the shadow also varies depending on the distance to an obstacle that blocks sunlight, the area of ​​the obstacle, the direction of the normal of the panel, and whether it is placed vertically or diagonally.

[0051] Solar panels were attached to each face of a cube, and the amount of solar radiation depending on the installation direction was calculated using a solar radiation database (NEDO), as shown below. The calculation conditions were Tokushima City, Tokushima Prefecture, and April. There is no solar radiation data when the normal to the faces faces the ground, so this is set to 0. A normal is a line perpendicular to a face at a certain point on the face. Below, the cube is considered to be a dice, with the face with a number 1 on the dice being face 1, the back of face 1 being face 6, the back of face 2 being face 5, and the back of face 3 being face 4. Face 6 of the cube is placed on the ground with the bottom down. Units are kWh / m 2 The optimal tilt angle is 18.7 degrees (facing due south), and the amount of solar radiation is 4.81. (1) When face 2 faces due south Surface 1 (zenith) 4.66 Face 2 (South) 2.43 Face 3 (East) 2.53 Side 4 (west) 2.53 Side 5 (North) 1.30 Surface 6 (ground) 0 Total 13.45 (2) When face 2 is southwest Surface 1 (zenith) 4.66 Face 2 (Southwest) 2.65 Face 3 (Southeast) 2.65 Face 4 (Northwest) 1.85 Surface 5 (north etc.) 1.85 Surface 6 (ground) 0 Total 13.66

[0052] The amount of power generated was measured under the following conditions: In the present invention, the amount of power generated per installation area refers to the amount of power generated per horizontal area in which the solar power generation panel is installed. (Test 1) Indoors, fluorescent light alone was used to illuminate the room at 220Lx from a flat plate (600cm x 20cm x 30cm) 2 ), a cube with a side length of 10 cm (surface area 600 cm 2 , horizontal cross-sectional area 20cm 2 In the case of a flat plate measuring 20 cm in length and 30 cm in width, the generated voltage was 3.04 V and the amount of power generated per installation area was 5.07 mV / cm. 2 In contrast, for a cube with a side length of 10 cm, the generated voltage is 1.3 to 1.8 V and the horizontal cross-sectional area is 200 cm 2The power generation per unit area calculated is 6.5 to 9.0 mV / cm 2 This represents an improvement of approximately 28% to 77%.

[0053] (Test 2) Indoors, a halogen beam lamp (150 type) was placed at a distance of about 25 cm from the panel, providing 18,000 LX, and a flat plate (200 cm long and 10 cm wide) was placed on the panel. 2 ), a cube with a side length of 10 cm (surface area 600 cm 2 , horizontal cross-sectional area 200cm 2 In the case of a flat plate measuring 20 cm in length and 10 cm in width, the generated voltage was 6.2 V, and the amount of generated power per installed area was 31 mV / cm. 2 In contrast, for a cube with sides of 10 cm, the generated voltage is about 11 V and the horizontal cross-sectional area is 200 cm 2 The power generation per unit area calculated is 55mV / cm for flat plates. 2 This represents an improvement of approximately 77%.

[0054] (Test 3) Measurements were taken (May 2021) in outdoor sunlight (measurement not possible at 40,000 LX or more) and the results were 2 ), and a cube with a side length of 10 cm (surface area 600 cm) compared to a cube with six flat faces. 2 , horizontal cross-sectional area 20cm 2 ) generated about half the amount of electricity. 2 As a result, the amount of electricity generated per installed area has increased by approximately 40 to 50%.

[0055] The solar power generation device 100 shown in Fig. 1 has solar power generation panels 3 on all six faces of a cube 2. However, although not shown, it is also possible to have some faces of the cube without solar power generation panels. For example, since the three lower faces of the cube are inclined downward at 45 degrees and generate less power than the upward facing faces, it is also possible to have solar power generation panels only on the upper three faces and not on the lower three faces.

[0056] By making the shape of the polyhedron 1 a three-dimensional shape with thickness, such as the cube 2 shown in Figure 1, it is possible to suppress the decrease in power generation efficiency caused by temperature rise in the polyhedron in areas other than those directly irradiated by sunlight, compared to when a solar panel is installed on a flat plate.

[0057] Each side of the cube 2 is preferably 1 cm to 30 cm, and more preferably 5 cm to 15 cm. The material of the cube 2 is not particularly limited. The cube 2 is preferably made of resin, but can also be made of metal such as aluminum. A small size allows the cube 2 to be made compact and lightweight overall, making it easy to move and carry. It is convenient for use in the garden or indoors for personal consumption, and can also serve as a temporary charging function for mobile devices and the like for outdoor use or in the event of a disaster. A large size allows the surface area of ​​the cube 2 to be increased, thereby increasing the amount of power generation.

[0058] The solar power generation device 100 shown in Fig. 1 is a multi-stage type in which two cubes 2 are stacked vertically above and below. However, the solar power generation device 100 can be configured to stack three or more cubes in multiple stages, and multiple cubes can be arranged in a direction other than vertical. In the solar power generation device 100 shown in the figure, the cubes 2 arranged above and below are connected at their vertices 2a, and the diagonal line (vertex diagonal line) of the upper cube 2 and the diagonal line (vertex diagonal line) of the lower cube 2 that pass through the connected vertices 2a are located on the same straight vertical axis and extend vertically. The vertex 2a at the top of the cube 2 and the vertex 2a at the bottom of the cube 2 are located on the vertical axis. The three upper faces of each cube 2 that are in contact with the vertex 2a, which is the top position of each cube 2, are arranged as inclined faces inclined 45 degrees upward from the vertex diagonal, and the sides connecting the three upper faces are located at 120 degrees in a plan view, and the three upper faces of the cube 2 cover a 360-degree direction. Therefore, the three upper faces of the cube 2 can secure solar radiation on any face regardless of the direction or height of the sun, and the amount of power generation can be increased. In addition, by connecting multiple cubes 2 at the vertices 2a of the cubes 2, the surface area, i.e., the installation area of ​​the solar panel, can be made larger than that of a cylindrical solid body such as a square pillar or cylinder of the same height. In addition, each of the three upper faces of the cube 2 can be made into an upward inclined face, and the amount of power generation can be increased by irradiation of sunlight from above, especially during the day, compared to when the solar panel is installed vertically like a cylindrical solid body such as a square pillar or cylinder. The three lower faces of the cube 2 that are in contact with the vertex 2a, which is the lowest position of the cube 2, are arranged as inclined faces inclined 45 degrees downward from the vertex diagonal, and the sides connecting the three lower faces are located at 120 degrees intervals in a plan view, so that the three lower faces of the cube 2 cover a 360-degree direction. The three upper faces and the three lower faces of the cube 2 are in the range of 0 to 90 degrees with respect to the normal line of each face, that is, as long as the sun is located on the surface side of each face on which the solar panel 3 is provided rather than on the same horizontal plane as each face, the solar light is irradiated onto the solar panel 3, and solar power generation can be performed. As described above, the solar power generation device 100 can generate a larger amount of power per installation area than when solar panels are provided on a flat surface or on the side of a cylindrical solid.

[0059] In the solar power generation device 100 in FIG. 1, the cubes 2 are connected at the vertices 2a on the diagonal of the cubes 2, and two cubes 2 are arranged vertically. If the lower surface of the upper cube and the upper surface of the lower cube are arranged so as to be horizontal and parallel to the ground, the shadow of the upper cube will cover the lower cube, and the shadow will be cast on the upper side surface of the lower cube, which is the upward surface that has good power generation efficiency. In this case, it is necessary to provide a space between the upper and lower cubes to reduce the shadow area. In contrast, in the solar power generation device 100 in FIG. 1, the cubes 2 are connected at the vertices 2a on the diagonal of the cubes 2, so that the portion of the shadow of the upper cube 2 cast on the lower cube 2 can be reduced. The upper three faces and the lower three faces of the cube 2 are inclined faces, and when the angle of incidence of sunlight is 45 degrees or less, the shadow of the upper cube 2 will not be cast on the lower cube 2.

[0060] Also, for example, if a cube is placed on an installation surface with one side facing down, one of the bottom faces will be in contact with the installation surface and will be completely shaded, making it impossible to generate solar power, or a dead space will be created since no solar panel will be installed. In contrast, the solar power generation device 100 in Fig. 1 connects the cubes 2 at their diagonal vertices 2a, and connects the bottom vertex 2a of the cubes 2 on the extension line to the support base, so that the bottom of the cubes 2 do not come into contact with the support base and create dead space. These points also contribute to increasing the amount of power generated per installation area.

[0061] In the solar power generation device 100 in FIG. 1, two cubes 2 arranged vertically one above the other are connected at their vertices 2a, and the diagonals of the upper and lower cubes 2 passing through the connected vertices 2a are located on the same straight line extending vertically. The upper and lower cubes 2 shown in FIG. 1 are fixed in a predetermined position and attitude by a fixing device 22. As shown in the figure, when a bolt shaft having a screw thread is used for the support bar 21 and the connecting shaft 5 described later, a nut can be used for the fixing device 22. The fixing device 22 can be other structures, members, and shapes that fix the cube 2 in a predetermined position and attitude, such as a ring or a cap. The parts to be connected, such as the vertices 2a of the cubes 2, the support bar 21, the connecting shaft 5, and the support base 24, can be shaped to match the connection mode in order to position them and prevent them from being displaced.

[0062] The two cubes 2 of the solar power generation device 100 in FIG. 1 have the same shape and the same size. The number of polyhedrons 1 can be three or more, and is not limited to polyhedrons of the same shape and the same size. Although not shown, for example, in addition to cubes, rectangular parallelepipeds, regular tetrahedrons, regular octahedrons, etc. can be arranged to create polyhedrons of different shapes. In addition, polyhedrons of different sizes can be created by using a larger polyhedron as the main power generation part, mixing polyhedrons of different sizes to add contrast or accent to the design, or gradually increasing or decreasing in size in a certain direction.

[0063] In the solar power generation device 100 in Fig. 1, two cubes 2 are arranged vertically, one above the other, but the arrangement of the multiple cubes 2 is not limited to this, and the cubes 2 can be arranged horizontally, or in a diagonal direction other than vertical and horizontal, or in a combination of these. By being able to arrange the multiple cubes 2 in various ways, the space can be more effectively utilized three-dimensionally and the amount of power generation can be increased compared to when the solar power generation panel 3 is installed on one side of a flat surface. In addition, by arranging the multiple cubes 2 in a certain direction, or by arranging and connecting the multiple cubes 2 in a certain pattern, and combining the multiple cubes 2 in various directions, it becomes possible to utilize the space three-dimensionally, and the diversity of designs can be expanded.

[0064] In the solar power generation device 100 shown in Fig. 1, the upper cube 2 and the lower cube 2 are arranged in the same orientation and facing the same direction. In other words, the normal lines of a certain face of the upper cube 2 and the corresponding face of the lower cube 2 face in the same direction, and the certain face of the upper cube 2 is arranged in a planar parallel state to the corresponding face of the lower cube 2. In contrast, as shown in Fig. 2, the solar power generation device 100 can be arranged so that the normal lines of a certain face of the upper cube 2 and the corresponding face of the lower cube 2 face in different directions. This allows the certain face of the upper cube 2 to be arranged in a planar non-parallel state to the face of the lower cube 2. As shown in Fig. 2, when two cubes 2 of the same size are connected at their vertices 2a and arranged vertically, either the upper cube 2 or the lower cube 2 is rotated around the vertical axis passing through the connecting vertices 2a to shift the positions of the vertices 2a of the upper and lower cubes 2 other than the vertex 2a on the vertical axis, and the upper and lower cubes 2 are arranged so that the vertices 2a of the upper cube 2 other than the connecting vertices 2a on the vertical axis do not overlap with the vertices 2a of the lower cube 2 in a plan view seen from above, thereby making it possible to make the faces of the upper cube 2 and the lower cube 2 non-parallel in plan view. In this case, the change in the amount of power generated is reduced and stable power generation can be achieved compared to the case in which the faces of the upper cube 2 are arranged to be parallel to the faces of the lower cube 2 as shown in Fig. 1. When a certain face of a cube 2 is arranged so that it is parallel to the faces of other cubes 2 as shown in Figure 1, the certain face of the cube 2 and the corresponding faces of the other cubes 2 face the same angle and direction, so that the same amount of power is generated when exposed to sunlight from one direction, except that the lower side is in the shadow of the upper side. Since the direction and angle of sunlight irradiation change over time, the same change in the amount of power generated is shown. The value obtained by multiplying the change in the amount of power generated by the number of cubes 2 is the change in the total amount of power generated, and the difference between the maximum and minimum amounts of power generated becomes large. In contrast, as shown in Figure 2, when a certain face of a cube 2 is positioned in a non-parallel state to the faces of other cubes 2, each face of the polyhedron is arranged to face in a different direction, and any face can generate power efficiently from sunlight whose irradiation direction and angle change over time, the minimum value of the amount of power generated can be raised, and the change in the amount of power generated can be reduced, enabling stable power generation.

[0065] As shown in Figs. 1 and 2, the solar power generation device 100 connects the support bar 21 or the continuous shooting shaft 5 to the support base 24 via the support base shaft 24a. This structure makes it easy to attach a mechanism for manually changing the position of the cube 2, for example by rotating, moving up and down, or tilting it. However, although not shown, the support bar or the continuous shooting shaft can be directly connected to the support base without using the support base shaft to connect the apex of the lowest part of the cube. The support column can also be directly connected to the support base. The solar power generation device 100 in Figs. 1 and 2 supports the upper part of the connected cube 2 with the support bar 21 and the lower part with the support base 24. However, although not shown, the connected cube 2 can be supported only by the support base 24 from the bottom side, and further, by providing a part for hanging the connected cube 2 on the cube 2 or the support bar 21, the connected cube 2 can be supported from the top side or from the position of the hanging part. (Ventilation hole 4)

[0066] As shown in FIG. 3 and FIG. 4D, the cube 2 may be provided with an air vent 4. The air vent 4 is provided to allow ventilation between the inside and outside of the cube 2, and air flows in and out through the air vent 4, bringing the temperature inside the cube 2 closer to the outside temperature, suppressing an excessive temperature rise in the cube 2, and suppressing a decrease in power generation efficiency due to an excessive temperature rise in the photovoltaic power generation panel 3. When the air vent 4 is provided, at least one air vent 4 is provided in the upper part of the cube 2. The number of the air vent 4 is at least one, and preferably two or more. The position of the air vent 4 is preferably one or more above and below the cube 2. A plurality of air vents 4 may be provided above and below the cube 2, and the air vent 4 may be provided below, in the middle, etc., other than above the cube 2. The upper part of the cube 2 refers to a part above the middle of the cube 2, and the lower part of the cube 2 refers to a part below the middle of the cube 2. The cube 2 in Fig. 4D has vents 4 near the upper vertex 2a and the lower vertex 2a of the cube 2. It is desirable to exhaust the heated air inside the cube 2 from the vent 4 at the top of the cube 2 and to draw in outside air from the vent 4 at the bottom of the cube 2, thereby creating an air flow.

[0067] The vent 4 can be provided at the vertex 2a of the cube 2 and its vicinity, at the edge and its vicinity, on other faces, or across these. The size of the vent 4 is an appropriate size that allows air to enter and exit the cube 2 depending on the size of the cube 2, the degree of temperature rise and its suppression, etc. It is not necessary to make the vent 4 larger than necessary to prevent unnecessary things such as dust, water droplets, insects, and foreign objects from entering. The shape of the vent 4 is not particularly limited. The vent 4 can be shaped in a shape that matches the position where the vent 4 is provided, including regular shapes such as square, triangular, fan-shaped, and slit-shaped holes other than round holes, and even irregular shapes. A gap can be provided by steps or unevenness in the solar power generation panel 3 or the base plate, or the vent 4 can be provided in the connection part or framework of the solar power generation panel 3. The vent 4 can be provided with a lid, cap, net, eaves, riser, etc. to prevent unnecessary things such as dust, water droplets, insects, and foreign objects from entering depending on the position where it is provided, the size and direction of the opening, etc., and these can also be combined. In addition, a structure that can prevent dust, water droplets, insects, foreign objects, and other unnecessary things from entering can be adopted, for example, by connecting a hollow pipe to the vent 4 so that it does not open upward. For example, in FIG. 4D, the vent 4 near the upper apex 2a of the cube 2 is covered with a washer, and the vent 4 near the lower apex 2a of the cube 2 is not provided with anything in particular. However, the vent 4 near the lower apex 2a of the cube 2 can be structured similarly to the vent 4 near the upper apex 2a of the cube 2, or can be structured differently from the vent 4 near the upper apex 2a of the cube 2, for example, by providing a riser. The vent 4 can also be of an openable / closable type that can be closed when it is not necessary to open it, such as in winter or on rainy days. When the solar panel 3 is attached on the base material of the cube 2, the vent 4 is assumed to penetrate the base material, but a ventilation path such as a gap can also be provided between the panel and the base material. (Solar power panel 3)

[0068] In the solar power generation device 100 of Figs. 1 to 3, a solar power generation panel 3 is provided on the surface of a cube 2. As shown in the figure, the solar power generation device 100 generates power when sunlight is irradiated onto the solar power generation panel 3 from the direction of the dotted arrow, for example. By stacking two cubes 2 and arranging the solar power generation panels 3 on the surfaces of the cubes 2 in various directions, any one of the solar power generation panels 3 can generate power efficiently even if the irradiation angle and direction of the sunlight change, and the decrease in the amount of power generation can be suppressed, and the amount of power generation per installation area can be increased. The present invention does not limit the solar power generation panel to a specific one. In addition to silicon-based such as single crystal, polycrystalline, HIT, and amorphous, compound-based CIS that does not use silicon can be used. In addition to products that are already on the market, products that will be developed and improved in the future can be used as the solar power generation panel. (Support part 20)

[0069] The solar power generation device 100 in FIG. 1 to FIG. 3 includes a support unit 20 that supports a cube 2. The support unit 20 supports one or more cubes 2 by sandwiching their diagonal vertices 2a. The support unit 20 can support each cube 2 by sandwiching its diagonal vertices 2a, and can support multiple cubes 2 by sandwiching their diagonal vertices 2a at both ends on the same diagonal line. The support unit 20 in FIG. 1 and FIG. 2 includes a support bar 21 that supports the diagonal top vertices 2a and bottom vertices 2a of two connected cubes 2, and a support column 25 that is connected to the support bar 21 and supports the multiple cubes 2. The support unit 20 in FIG. 1 and FIG. 2 includes a shaft in which the support bar 21 passes through the diagonal top vertices 2a to the bottom vertices 2a of the two cubes 2, and the support bar 21 is connected to the support column 25 to support the two cubes 2. In the figure, a fixing part 22 is provided to fix the cube 2 at a predetermined position and attitude. Each cube 2 is fixed at a predetermined position and attitude by the fixing part 22. In this case, a plurality of cubes 2 are first connected together by a support bar 21 penetrating the cube 2 diagonally, and then the plurality of cubes 2 can be connected together to a support column 25. However, the support bar 21 can also support the cube 2 without penetrating the cube 2 diagonally, and can support the cube 2 as in the example shown in FIG. 4 below. In FIGS. 1 to 3, the support column 25 and the support bar 21 are fixed to the support base 24 via the support base shaft 24a. However, although not shown, the support column or the support bar can also be fixed directly to the support base without using the support base shaft.

[0070] The support unit 20 in FIG. 3 includes support bars 21 that sandwich and support the vertices 2a of the cubes 2 on the same diagonal line, and each support bar 21 is connected to a support column 25 to support a plurality of cubes 2. The support unit 20 in FIG. 3 further includes a support adjustment unit 23 that contacts the vertices 2a of the cubes 2. FIG. 4D is an enlarged cross-sectional view of a main part of FIG. 3. The support adjustment unit 23 is connected to the support bars 21 that sandwich and support the vertices 2a on the diagonal line of each cube 2, and contacts and clamps the vertices 2a of the cubes 2. The support adjustment unit 23 can easily set the cubes 2 to a predetermined position and posture, and can fine-tune the position, posture, angle, and strength of the cubes 2 to be clamped and fixed, and can easily remove each cube 2 as needed. When assembling the device, replacing each cube 2, performing maintenance, etc., it is extremely convenient to be able to temporarily fasten the cube 2 first and then perform wiring, adjust the position and attitude of the cube 2, or perform other work after attaching the cube 2, and to be able to attach or remove each cube 2 separately.

[0071] The support adjustment part 23 connected to the support bar 21 can use a bolt by providing a screw thread (female screw) on the support bar 21 side as shown in FIG. 3 and FIG. 4D. By simply turning the screw head 23a of the bolt in either direction, the distance between the tip surface of the support bar 21 of the female screw into which the bolt is screwed and the surface where the screw head 23a contacts the apex 2a of the cube 2 can be easily adjusted by the length of the screw thread part 23b. By tightening the bolt, the degree of fixation of the cube 2 can be easily fine-tuned, and the position and posture of the cube 2 can also be easily fine-tuned. By matching the shape of the screw head 23a of the bolt to the apex 2a of the cube 2, or by attaching a cap or the like that matches the apex 2a of the cube 2, the support adjustment part 23 can prevent the position and posture of the cube 2 from shifting, and the support part 20 can support the cube 2 more firmly. The support adjustment portion 23 is not limited to the structure shown in FIG. 3 and FIG. 4D, but may have a structure in which it is connected to the support bar 21 and is in contact with and clamped against the vertex 2a of the cube 2.

[0072] 3 is connected to a support bar 21 that supports each cube 2 by sandwiching its vertex 2a, and includes a support adjustment part 23 that contacts the vertex 2a of the cube 2. Although not shown, it is possible to remove two cubes at a time as a support bar that supports multiple cubes, for example two cubes, by sandwiching their vertices at both ends, and to fine-tune the position, attitude, and degree of fixation.

[0073] 1 to 3, the solar power generation device 100 has the diagonal vertical axis passing through the vertices where the two cubes 2 are connected as the center of the device, and a support pillar 25 is placed away from the central vertical axis, supporting the cubes 2 via a support bar 21. However, although not shown, the center of the device can also be the support pillar. Also, the device can be placed so that the center is not the support pillar and is not on the diagonal vertical axis passing through the vertices where the cubes are connected. (Connecting shaft 5)

[0074] The solar power generation device 100 in FIG. 1 and FIG. 2 is configured by connecting the cubes 2 arranged vertically at the vertices 2a of the cubes 2 via the connecting shaft 5. The connecting shaft 5 connects the gap between the cubes 2 arranged vertically. The gap between each cube 2 can be adjusted by the length (d) of the connecting shaft 5. By connecting each cube 2 with a gap between them, the area where the shadow of the upper cube 2 falls on the lower cube 2 when sunlight is irradiated from above is reduced, and the ventilation is improved to suppress an excessive temperature rise of the solar power generation panel 3 due to the ventilation hole 5, thereby increasing the amount of power generation per installation area. The length (d) of the connecting shaft 5 is optimally determined depending on the size and number of the cubes 2, the size of the entire device, the installation location, the installation environment, etc. For example, when one side of the cube 2 is 10 cm, the length is preferably 2 cm to 15 cm, more preferably 5 cm to 10 cm. However, although not shown, it is also possible to arrange the cubes 2 so that the vertices 2a of the cubes 2 are adjacent to each other or directly connected to each other without the use of a connecting shaft or with almost no connecting shaft.

[0075] The connecting shaft 5 can be shaped to connect to the vertices 2a of the cubes 2 so that the cubes 2 are positioned in a predetermined position and connected, and can be shaped to prevent misalignment. Depending on the method of connecting the vertices 2a of the cubes 2 to the connecting shaft 5, the cubes 2 can be arranged in a predetermined direction, the directions of the cubes 2 can be aligned in a constant manner, and the cubes 2 can be connected with high precision in terms of their position, orientation, etc. The connecting shaft 5 can also serve as the support bar 21. When the connecting shaft 5 is used to connect the gap between the cubes 2, it is the connecting shaft 5, and when the connecting shaft 5 is used to support one or more cubes 2 by sandwiching their diagonal vertices 2a, it is the support bar 21. The connecting shaft 5 penetrates the cubes 2 diagonally, thereby improving the connection strength of the cubes 2 and the strength of the entire device.

[0076] 4A to 4D show examples of the connecting shaft 5 and the support bar 21. The connecting shaft 5 in FIG. 4A not only connects the intervals between the cubes 2, but also penetrates the vertices 2a on the diagonal of the cubes 2. By connecting and fixing a plurality of cubes 2 to the connecting shaft 5 penetrating the diagonal of each cube 2, the connecting strength of the cubes 2 can be increased. The connecting shaft 5 can be provided at a position where the cubes 2 are connected to the upper and lower vertices 2a of the cubes 2 or on one side, so that the cubes 2 are connected in a predetermined posture and position. A separate member can also be attached. In FIG. 4B, a male screw is provided on the connecting shaft 5 side and a female screw is provided on the vertex 2a side of the cube 2, and the male screw is inserted into the female screw to connect the connecting shaft 5 to the vertex 2a of the cube 2. Although not shown, it is also possible to connect the cubes 2 by providing a male screw on the vertex 2a side of the cube 2 and a female screw on the connecting shaft 5 side. As shown in FIG. 4C, a bolt shaft with a thread can be used as it is. In order to connect the vertices 2a of the upper and lower cubes 2 via the connecting shaft 5, a hole is provided at the vertex 2a where the connecting shaft 5 is connected to the cube 2, as shown in Figs. 4A to 4C, into which the connecting shaft 5 is inserted. By making the connecting shaft 5 detachable from the cube 2, it is convenient to carry and replace parts. The connecting shaft 5 can be in a rod shape such as a cylindrical or rectangular column shape, or a hollow tube shape. Fig. 4D is an enlarged cross-sectional view of a main part of Fig. 3. The connecting shaft 5 in Fig. 4D is a part that connects the space between the cubes 2, and also serves as a support bar 21 that supports the vertices 2a on the diagonal of each cube 2 by sandwiching them.

[0077] The connecting shaft 5 can be hollow. When sunlight is irradiated to a specific portion for a certain period of time or more and the temperature of the irradiated surface of the photovoltaic panel 3 (cube 2) rises, the connecting shaft 5 is heated and the heated air in the hollow of the connecting shaft 5 rises and is discharged, and new air flows in from below the connecting shaft 5 to cool the connecting shaft 5, creating a tunnel effect. The tunnel effect cools the connecting shaft 5 and prevents it from reaching a certain temperature or higher, and suppresses the photovoltaic panel 3 from becoming too hot and reducing its power generation efficiency. In solar cells, the amount of power generated is maximum at a surface temperature of about 25 degrees (the catalog performance of a photovoltaic panel is measured at 25 degrees according to international standards), and the amount of power generated decreases if the temperature rises beyond that. Specifically, the amount of power generated decreases by 0.4 to 0.5% for every degree increase. When the outside temperature in summer exceeds 30 degrees or even 40 degrees, the surface temperature of the panel rises to 70 to 80 degrees, and the amount of power generated may decrease by about 20 to 30% from the maximum amount of power generated.

[0078] In addition, wiring the electric wires from the photovoltaic panels 3 inside the hollow connecting shaft 5 can improve the design of the exterior and prevent the effects of the external environment and physical obstacles. To circulate air efficiently for the tunnel effect, a partition or a hollow passage can be provided separately from the electric wire wiring. In addition, the support part 20, for example, the support bar 21 or the support column 25, or both, can be hollow to wire the electric wires.

[0079] 1 to 3 show an example in which two cubes 2 are arranged vertically and connected via a connecting shaft 5. Multiple cubes 2 can be arranged in various directions, such as vertical, horizontal, and other directions, and by combining cubes 2 and connecting shafts 5, multiple cubes 2 can be arranged in a more diverse manner, improving the design and diversity. Furthermore, they can be used as symbolic ornaments such as artworks and objets d'art, and can even be shaped into signs and guide signs in the form of arrows and other symbols, logos, letters, etc., and can also be installed as a power supply device alongside signs and traffic signs.

[0080] FIG. 5A shows an example in which multiple cubes 2 are arranged horizontally, FIG. 5B shows an example in which cubes 2 are arranged on a horizontal plane, and FIG. 5C shows an example in which cubes 2 are arranged three-dimensionally. FIG. 5D shows an example in which cubes 2 are arranged three-dimensionally and can stand independently stably. In FIG. 5D, four connecting shafts 5 are extended diagonally downward from each of the four vertices 2a on the bottom side of the central cube 2, so that the cube can stand independently stably without a support base. Furthermore, as shown in the figure, a cube 2 can be connected to each of the four connecting shafts 5.

[0081] Although not shown, the solar power generation device 100 can be equipped with one or more output terminals and a battery. The output terminals can be used to charge a mobile phone, smartphone, etc. at the same time as generating electricity. By charging the battery, the generated electricity can be used anywhere and at any time. The battery can be installed in various forms, such as being built into one or more cubes or a support base, or being separately attached externally. The output terminals can be installed on the cube or support base to use the generated electricity, or it can be connected to an external battery. [Embodiment 2]

[0082] A solar power generation device 200 according to a second embodiment of the present invention is shown in Fig. 6 and Fig. 7. Fig. 6 is a schematic perspective view showing an example of the solar power generation device 200 including a reflector 7, and Fig. 7 is a schematic perspective view showing an example of the arrangement of the reflector 7.

[0083] A solar power generation device 200 according to a second embodiment of the present invention includes a plurality of cubes 2 connected at vertices 2a, a solar power generation panel 3 provided on each surface of each cube 2, and a reflector 7 having a mirror surface for reflecting solar light. In the solar power generation device 200 shown in FIG. 6, the solar light indicated by the dotted line is directly irradiated onto the solar panel 3, and the solar light reflected by the reflector 7 can also be irradiated onto the solar panel 3. The reflector 7 can reflect the solar light onto the upper, side, and lower surfaces of the cube 2 to increase the amount of solar light irradiated onto the cube. By efficiently reflecting the solar light onto the lower surface of the cube 2, the amount of power generated per installation area can be increased. For example, when two cubes 2 are arranged vertically, one above the other, as shown in FIG. 6 and FIG. 7, when the upper three surfaces of each cube 2 are irradiated with sunlight from above, the lower three surfaces of each cube 2 are shaded. Therefore, the reflector 7 can be used to irradiate the lower three surfaces of each cube 2 with sunlight, thereby increasing the amount of power generated per installation area. The amount of power generated per installation area can be increased compared to the solar power generation device 100 that is not provided with a reflector 7. According to actual measurement data, the amount of power generated by the solar power generation device 200, in which light is reflected to multiple cubes 2 by one reflector 7, is improved by approximately 10 to 35% compared to the solar power generation device 100 without the reflector 7. (Reflector 7)

[0084] The reflector 7 has a mirror surface that reflects sunlight on the side facing the cube 2, and the reflector 7 is provided at a position where the reflected sunlight is irradiated onto the cube 2. The solar power generation device 200 in FIG. 6 has two cubes 2 each equipped with a reflector 7, and the reflector 7 is connected to a reflector support part 8 and arranged at a predetermined position and attitude. The number, size, shape, etc. of the reflector 7 are determined within an appropriate range according to the size of the cube, the distance from the cube, the positional relationship, and in the case of a polyhedron other than a cube, its shape, size, and the size of the entire device. By providing a reflector 7 corresponding to each cube 2, the area of ​​the mirror surface of the reflector 7 can be reduced and the size and shape can be made to match the cube 2, and the attitude such as the angle and position of each reflector 7 can be easily adjusted to match the cube 2 and the sunlight, and the material cost can be reduced. However, the reflector 7 can be made to a size and shape that covers multiple cubes 2. In addition, two or more reflectors 7 can be provided for one cube 2, or reflectors 7 of different sizes and shapes can be provided, and the size and shape of the reflector 7 can be made to match the faces of the cube 2 and its positional relationship with the cube 2.

[0085] The reflector 7 in Fig. 6 is connected to a reflector support part 8 connected to a support base 24 and fixed at a predetermined position and attitude. However, although not shown, it is possible to connect the reflector to a support part including a support column supporting the cube, and to have a structure in which the support part supports the cube and the reflector without providing a separate reflector support part. Conversely, it is also possible to have a structure in which the reflector support part supports the cube and the reflector.

[0086] 7A to 7C show examples of the shape and installation method of the reflector 7. In order to reflect sunlight from above to the cube 2, it is necessary to provide the reflector 7 below a plurality of cubes 2. In FIG. 7A, the cube 2 is surrounded by a curved reflector 7, and in FIGS. 7B and 7C, flat plates are folded or connected to form a polygonal reflector 7 surrounding the cube 2. In addition, the cube 2 can be surrounded in various shapes, such as a combination of flat and curved surfaces, or an irregular shape according to the direction and angle of sunlight irradiation. As shown in FIGS. 7A and 7B, the reflector 7 can surround the entire circumference of the cube 2, or as shown in FIG. 7C, it can be arranged around the cube 2 so as to partially surround it. When the reflector 7 is arranged to surround a part of the cube 2 as in FIG. 7C, the reflector 7 is arranged except for the direction in which the cube 2 is directly irradiated with sunlight. A reflector 7 can be provided on the opposite side of the cube 2 to the sun so that the reflector 7 does not block the irradiation of sunlight. The reflector 7 can be provided continuously around the cube 2 as shown in Figures 7A to 7C, or can be provided discontinuously with intervals around the cube 2. The reflector 7 can have one or more planar or curved surfaces, or a combination thereof.

[0087] The periphery of the cube 2 on which the reflector 7 is provided refers to an area including not only the surfaces corresponding to the side faces of the cube 2 but also the surfaces corresponding to the bottom face. It is preferable to provide a reflector 7 having a mirror surface also below the cube 2 so that sunlight from above can be reflected to the cube 2. The lower half of the cube 2 is shaded by the sunlight irradiated from above, especially during the daytime, but by providing the reflector 7 on the surface corresponding to the lower face of the cube 2, i.e., the upper face side of the support base 24, the sunlight can be reflected and irradiated below the lower half of the cube 2. The lower part of the reflector 7 can be a hemispherical, semi-elliptical, conical, pyramidal, or other tapered shape, and can also be a curved surface, a flat surface, or a combination of a curved surface and a flat surface.

[0088] The height of the reflector 7 is optimally determined taking into consideration the height and size of the cube 2, the expected amount of power generation, the size of the entire device, and even the design. By lowering the height of the reflector 7, it is possible to avoid blocking the irradiation of sunlight, and by raising the height, it is possible to irradiate reflected light from above as well. In addition, by making the reflector 7 at a certain height compared to the cube 2, it is possible to suppress and prevent light pollution caused by the reflected light of the panel as much as possible, and it is also possible to cover the cube 2. The height of the reflector 7 can be a constant height as shown in Figures 7A to 7C, or it can be made different heights according to the cube 2 and the irradiation and reflection direction of sunlight.

[0089] The mirror surface of the reflector 7 is not limited to a flat surface, but can be curved or uneven, such as a complex shape made up of a combination of triangles. The curved mirror surface can collect or disperse the irradiated sunlight and reflect it to the cube 2. Although not shown, a lens can also be used to collect or disperse the sunlight.

[0090] The reflectors 7 can be provided continuously around the cube 2, or can be arranged discontinuously with intervals. As shown in FIG. 7C, an area without a reflector 7 can be provided in one direction, and intervals can be provided between multiple reflectors 7 as shown in FIGS. 8 to 10 described below. If the reflector 7 blocks sunlight and the amount of solar radiation decreases, the amount of power generation decreases, so the height of the reflector 7 can be made lower than the cube 2 to surround the entire periphery of the cube 2. Alternatively, an area without a reflector 7 or intervals can be provided between multiple reflectors 7 so that sunlight is directly irradiated onto the cube 2. By providing an area without a reflector 7 or intervals between multiple reflectors 7, the cube 2 can be made visible and ventilation can be improved. [Embodiment 3]

[0091] The photovoltaic power generation device 300 according to the third embodiment of the present invention shown in FIG. 8 further includes a polyhedron attitude changing mechanism 11 for changing the attitude of the cube 2. Changing the attitude of the cube 2 means changing the attitude of the cube 2, such as the position, angle, and direction, and includes rotating, tilting, or moving the cube 2 in the vertical direction. The polyhedron attitude changing mechanism 11 can change the attitude of the cube 2 by simply rotating, tilting, or moving the cube 2 up and down, as well as by combining these. For example, the cube 2 can be rotated while moving up and down, rotated while tilting, or rotated after tilting the cube 2 to a predetermined angle. The angle at which the cube 2 rotates and tilts can also be limited to a predetermined range. (Polyhedron attitude change mechanism 11)

[0092] The polyhedron drive mechanism 11 is a mechanism that can change the attitude of the cube 2. The polyhedron drive mechanism 11 can change the attitude of the polyhedron manually or electrically. In the case of manual operation, the position of the sun can be actually observed while adjusting to the optimum position where sunlight is efficiently irradiated onto the photovoltaic power generation panel 3. Furthermore, fine adjustments can be made while observing the state of the device, charging mode, temperature, installation location, time, etc. In the case of manual operation, the structure can be simplified and manufactured at low cost, and the device can be made lighter without requiring a motor or power source. It is easy to carry and can also be made into a disassembled and assembled type. As a manual structure, for example, bearings can be placed on the connecting shaft 5 or support bar 21, which serves as the central axis, to connect the cube 2 to the support base 24 so that it can rotate freely; a hole or shaft can be provided in the support base 24 through which the connecting shaft 5 can move up and down, and a cam can be used to move the cube 2 up and down in a sliding or handle-type manner; an air cylinder or spring can be used to change the position of the upper or lower end of the connecting shaft 5 along a rail or the like to tilt the cube 2; the elastic force of a spring, spring, rubber, etc. can be used; a stopper mechanism can be provided to maintain the position of the cube 2 at a specified position, and a mechanism can be provided to limit the range of position changes.

[0093] In the case of an electric motor, for example, a motor is used to change the position of the cube 2 by rotating, moving up and down, tilting, etc. In the case of an electric motor, the position and posture of the cube 2 can be changed at a predetermined speed, and it can also be driven according to the direction and position of the sun, the direction of sunlight irradiation, and the area of ​​shade. The cube 2 can be rotated by rotating the connecting shaft 5 that penetrates the cube 2 diagonally and connects it at the vertex 2a with a motor, and the cube 2 can be moved up and down and tilted using a cam. It is also possible to use a stepping motor for the driving part that moves the stocker up and down. Although not shown, it is also possible to have a structure that changes the posture of the cube by natural energy such as wind power and water power. The polyhedron posture changing mechanism 11 can use various mechanisms that are currently commercialized, including manual and electric, that can change the posture of the cube 2, as well as various mechanisms that will be improved and developed in the future. [Embodiment 4]

[0094] Fig. 9A is a schematic perspective view of an example of a solar power generation device 400 having a reflector position change mechanism 12, Figs. 9B and 9C are schematic perspective views of an example of a method for fixing the reflector 7, and Fig. 10 is a schematic perspective view of an example of the reflector position change mechanism 12. The solar power generation device 400 according to embodiment 4 of the present invention shown in Figs. 9 and 10 has a reflector position change mechanism 12 that changes the position of the reflector 7. Changing the position of the reflector 7 refers to changing the position, angle, direction, etc. of the reflector 7, and includes rotating, tilting, or moving the reflector 7 in the vertical direction, or a combination of these. (Reflector position change mechanism 12)

[0095] The reflector position change mechanism 12 is a mechanism that changes the position of the reflector 7. The reflector position change mechanism 12 can change the position of the reflector manually or electrically. The structure of the reflector position change mechanism 12 can be the same as that of the polyhedron drive mechanism 11, or it can be a different structure.

[0096] For example, the reflector 7 in Fig. 9B and Fig. 9C is rotatably connected to a reflector support bar 8a, and the reflector support bar 8a is connected to a reflector support part 8 via a connector 8b. The connector 8b connects the reflector support bar 8a to the reflector support part 8, and can determine the optimal connection angle. For example, the connector 8b can connect the reflector support bar 8a to the reflector support part 8 so that they intersect perpendicularly as shown in Fig. 9B, and can connect the reflector support bar 8a to the reflector support part 8 so that they intersect obliquely as shown in Fig. 9C. The connector 8b can also change the connection angle between the reflector support bar 8a and the reflector support part 8. For example, the connector 8b can be disposed near the center of the reflector support bar 8a as shown in Fig. 9B, or the connector 8b can be disposed near the end of the reflector support bar 8a as shown in Fig. 9C. In addition to these, the connection position, posture, and manner of the reflector support bar 8a and reflector 7 can be changed to change the posture, position, and direction, range, and manner of rotation, posture, and manner of the reflector 7 relative to the cube 2 around the axis at which the reflector support bar 8a is connected to the reflector 7. [Industrial Applicability]

[0097] The solar power generation device of the present invention can generate more power per installation area than conventional solar power generation devices, can irradiate solar light incident from various angles onto a solar power generation panel, and can be suitably used as a solar power generation device that can effectively utilize space in a three-dimensional manner. [Explanation of symbols]

[0098] 100, 200, 300, 400...Solar power generation equipment 1...Polyhedron 2…cube 2a…Vertex 3. Solar panels 4…Ventilation hole 5...Connecting shaft 7...Reflector 8...Reflector support part 8a…Reflector support bar 8b…Connector 11...Polyhedron attitude change mechanism 12...Reflector position change mechanism 20...Support part 21…Support bar 22…Fixed part 23...Support adjustment section 23a…Screw head 23b…Threaded part 24...Support stand 24a…Support shaft 25...Support pillar

Claims

1. A plurality of polyhedra; A solar panel provided on two or more faces of each of the polyhedrons; Equipped with the polyhedrons are connected at their vertices, Further, a support portion for supporting the polyhedron is provided, the support portion supports one or more of the polyhedrons by sandwiching vertices on diagonals of the polyhedron; The support portion is A support bar that sandwiches and supports vertices on a diagonal line of the polyhedron, and a support adjustment part that is connected to the support bar and contacts two vertices on the diagonal line of the polyhedron, A solar power generation device, characterized in that the support adjustment unit changes its position and attitude to adjust the attitude and position of the polyhedron.

2. A solar power generation device as described in claim 1, A solar power generation device characterized in that at least one ventilation hole is provided above the polyhedron.

3. The solar power generation device according to claim 1 or 2, A solar power generation device, wherein the polyhedron is a hexahedron.

4. The solar power generation device according to any one of claims 1 to 3, A solar power generation device characterized in that the polyhedrons are connected at positions on a straight line.

5. The solar power generation device according to any one of claims 1 to 4, the polyhedrons are connected at their vertices via connecting shafts, A solar power generation device, characterized in that the connecting shaft penetrates the polyhedron.

6. The solar power generation device according to any one of claims 1 to 5, the polyhedrons are connected at their vertices via connecting shafts, A solar power generation device, wherein the connecting shaft is hollow.

7. The solar power generation device according to any one of claims 1 to 6, the polyhedrons are connected at their vertices via connecting shafts, A female screw is provided on one of the apex side to which the polyhedron is connected and the connecting shaft side, and a male screw is provided on the other side, A solar power generation device, characterized in that the male screw is inserted into the female screw, and the polyhedrons are connected at their vertices via the connecting shaft.

8. The solar power generation device according to any one of claims 1 to 7, A solar power generation device comprising a polyhedron attitude changing mechanism for changing the attitude of the polyhedron.

Images