Solar battery installation structure

Abstract

To provide a solar battery installation structure capable of mainly facilitating maintenance and replacement of solar batteries installed on a roof part with transparency.SOLUTION: The present invention relates to a solar battery installation structure to install a solar battery 5 on a roof part 4 having a transparent roof material 3 placed on an outdoor 2 of a building 1. The solar battery 5 is to be a solar battery 11 in a sheet shape and to be installed on a rear surface of the roof material 3 with transparency. The roof part 4 has fixed bars 21 fixing the roof material 3 on the underside of the roof material 3, and the solar battery 11 in the sheet shape may be fixed through clamping with the fixed bars 21 and the roof material 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a solar cell installation structure. [Background technology]

[0002] The number of solar cells installed is on the rise due to the expanded use of renewable energy (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-154509 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, the solar cell described in Patent Document 1 is in the form of a film and is attached directly to the upper surface of the roof of a carport, etc. Therefore, the solar cell attached to the upper surface of the roof is difficult to maintain or replace.

[0005] Therefore, a main object of the present invention is to contribute to improving the above-mentioned problems. [Means for solving the problem]

[0006] In response to the above problems, the present invention provides: A solar cell installation structure in which solar cells are installed on a roof portion having a transparent roof material provided outdoors of a building, The solar cells are sheet-shaped solar cells and are installed on the back surface of the transparent roofing material. [Effects of the Invention]

[0007] With the above-described configuration, the present invention can facilitate maintenance and replacement of solar cells installed on a transparent roof portion. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an overall perspective view of a roof portion provided with a solar cell installation structure according to an embodiment, viewed from above. [Figure 2] FIG. 2 is an overall perspective view of the roof portion of FIG. 1 as seen from below. [Figure 3] 2 is a partially enlarged vertical cross-sectional view showing the schematic structure of a fixing rail portion of the roof portion of FIG. 1. FIG. [Figure 4] FIG. 4 is a more specific structural diagram of the fixed bar portion of FIG. 3. [Figure 5] 2 is a partially enlarged vertical cross-sectional view showing the schematic structure of a support rail portion of the roof portion of FIG. 1. FIG. [Figure 6] FIG. 5 is a more specific structural diagram of the support bar portion of FIG. 4. [Figure 7] FIG. 10 is an overall perspective view of a roof according to another embodiment, seen from above. [Figure 8] FIG. 10 is an overall perspective view of a roof according to another embodiment, seen from above. [Figure 9] FIG. 10 is an overall perspective view of a roof according to yet another embodiment, seen from above. [Figure 10] These are structural diagrams of a sheet-type solar cell, with (a) being a plan view and (b) being a cross-sectional view. [Figure 11] FIG. 10 is a plan view showing another structure of a sheet-shaped solar cell. [Figure 12] FIG. 3 is an enlarged front view of the lower part of the roof part of FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] This embodiment will be described in detail with reference to FIGS. [Example]

[0010] <Configuration> This embodiment has the following configuration: As shown in FIG. 1 (FIG. 2), solar cells 5 are installed on a roof portion 4 having a transparent roofing material 3 provided outside 2 of a building 1.

[0011] Here, the building 1 may be any type of building, such as a detached house or an apartment building. The outdoor area 2 is the outside of the building 1.

[0012] Transparency refers to light transmittance or translucency. A transparent roofing material 3 (transparent roofing material) is a plate material made of a transparent resin such as acrylic or polycarbonate, and has the strength and thickness required for a roofing material 3. The transparent roofing material 3 may be either colorless and transparent or colored and transparent. In many cases, the transparent roofing material 3 is colored and transparent, colored in dark colors such as black, navy blue, or blue, to provide a sunshade effect. When the roofing material 3 is colored and transparent, it is preferable that the roofing material 3 have a higher solar transmittance than normal so that a large amount of power can be generated.

[0013] The roof portion 4 may be a fixed part of the building 1, or may be a separate part that is separate and independent from the building 1. Examples of roof portions 4 having such a permeable roofing material 3 include carports, cycle ports, and entrance porches.

[0014] In this embodiment, the roof portion 4 having the permeable roofing material 3 is a cantilevered carport, but it may also be a double-supported carport. Also, the roof portion 4 is inclined to one side, but it may be, for example, nearly horizontal. The roof portion 4 may be, for example, flat or curved, such as an arch. The roof portion 4 in this embodiment has a compound shape with an almost flat upper side and a curved lower side, and is inclined overall to one side.

[0015] The solar cell 5 is an electronic device that generates power by directly converting the energy of sunlight into electricity. Currently, silicon-based solar cells 5 are the mainstream.

[0016] In addition to the basic configuration described above, this embodiment may also have the following configuration.

[0017] (1) In the solar cell installation structure of this embodiment, The solar cells 5 are sheet-shaped solar cells 11. The sheet-shaped solar cells 11 are placed on the back surface of the roofing material 3, which is transparent.

[0018] Here, the solar cell installation structure is a structure in which solar cells 5 are installed on a roof portion 4 having a transparent roof material 3.

[0019] The sheet-like material is a thin surface such as paper or cloth. The sheet is thicker than foil but thinner than a plate. The sheet is preferably thinner than the permeable roofing material 3. The sheet-like material may also be a film-like material.

[0020] The sheet-shaped solar cell 11 is a solar cell 11 that has been processed and formed into a sheet shape (sheet-shaped solar cell). The sheet-shaped solar cell 11 may be any type, for example, a perovskite solar cell. The sheet-shaped solar cell 11 may include, for example, organic thin-film solar cells, dye-sensitized solar cells, and the like that can be formed into a sheet, but hereinafter, a perovskite solar cell will be described as an example.

[0021] A perovskite solar cell is a solar cell 5 that uses a compound with a crystalline structure called perovskite as the photoelectric conversion material. Perovskite originally refers to the unique crystalline structure of perovskite, and various materials with this crystalline structure are collectively called perovskite. Perovskite solar cells 11 have been rapidly developed in recent years, and have achieved energy conversion efficiencies comparable to those of silicon-based solar cells 5. Similar photoelectric conversion materials to perovskite include non-silicon materials such as amorphous silicon and CIGS, a semiconductor material containing copper, indium, gallium, and selenium. Solar cells 4 using these photoelectric conversion materials can be made into sheet- or thin-plate-shaped solar cells 11, just like perovskite solar cells, and these may also be used.

[0022] Perovskite solar cells can be mass-produced by coating or printing, and are therefore resistant to distortion, which is expected to reduce costs and allow installation in locations where silicon solar cells 5 cannot be installed. Furthermore, perovskite solar cells are lighter than silicon solar cells 5, so it is possible to install perovskite solar cells on the roof 4 as is, without the need for reinforcement.

[0023] The perovskite solar cell can be formed into a relatively thin sheet-like solar cell 11. The sheet-like perovskite solar cell may be relatively flexible so that it can be bent and stretched. Alternatively, the sheet-like perovskite solar cell may be relatively rigid so that it is almost impossible to bend and stretched. That is, the perovskite solar cell may be formed using a soft resin that is thin and not rigid and does not retain its shape. Alternatively, the perovskite solar cell may be formed using a hard resin that has a certain thickness and rigidity and retains its shape to a certain extent. Whether the sheet-like perovskite solar cell is soft or hard can be determined as desired depending on the installation situation of the perovskite solar cell on the roof portion 4. In this embodiment, the sheet-like solar cell 11 (e.g., perovskite solar cell) may be soft or hard enough to be installed on the back surface of the roof portion 4.

[0024] The back surface of the transparent roofing material 3 is the underside of the transparent roofing material 3. Sheet-like solar cells 11 installed on the back surface of the transparent roofing material 3 generate electricity using sunlight that passes through the transparent roofing material 3.

[0025] For example, the sheet-like solar cells 11 may be installed in close contact with the back surface of the transparent roofing material 3, or may be installed with a gap therebetween. Also, for example, it is structurally possible to attach the sheet-like solar cells 11 directly to the back surface of the transparent roofing material 3 with an adhesive or adhesive tape (double-sided tape). In this case, the sheet-like solar cells 11 can be attached to the back surface of the transparent roofing material 3 with a strong adhesive or adhesive tape, but it is preferable to attach them to the back surface of the transparent roofing material 3 with a weak adhesive or adhesive tape so that they can be easily peeled off.

[0026] In this embodiment, the sheet-like solar cells 11 are attached to the rear surface of the transparent roofing material 3 in the following manner.

[0027] (2) In the above solar cell installation structure, as shown in FIG. 3 (FIG. 4), The roof portion 4 has fixing bars 21 on the underside of the roof material 3 for fixing the roof material 3. The sheet-like solar cells 11 may be fixed by being sandwiched between the fixing bars 21 and the roofing material 3.

[0028] Here, the fixed battens 21 are batten members provided on the roof section 4. The roof section 4 has a roof frame 22 (Fig. 1) and permeable roofing materials 3 attached to the roof frame 22. The permeable roofing materials 3 extend in the vertical or horizontal direction of the roof frame 22 and are installed inside the roof frame 22 in a row either horizontally or vertically so as to cover the entire surface enclosed by the roof frame 22. In this embodiment, the roofing materials 3 extend in the horizontal direction of the roof frame 22 and are arranged vertically.

[0029] The roof frame 22 is substantially rectangular in plan view, and has multiple fixing bars 21 and retaining members 23 arranged in parallel on the inside. The fixing bars 21 are provided on the underside of the permeable roof material 3, and the retaining members 23 are provided on the upper side of the permeable roof material 3, along with the fixing bars 21. The fixing bars 21 and retaining members 23 are provided along the edges of the permeable roof material 3 installed on the roof frame 22, and clamp the edges of the roof material 3 from above and below to secure them in place.

[0030] The roof material 3 is sandwiched between the upper pressing member 23 and the lower fixing bar 21, and is fixed in the vertical direction from above with fixing members 24 such as bolts or rivets. A seal may be provided between the pressing member 23 and the roof material 3 to prevent rainwater from entering.

[0031] The fixing bars 21 and the holding members 23 extend vertically or horizontally so as to partition the inside of the roof frame 22 into the shape of the roof material 3. In this embodiment, the fixing bars 21 and the holding members 23 extend mainly in the horizontal direction of the roof frame 22. The fixing bars 21 and the holding members 23 may also simultaneously secure the adjacent edges of adjacent roof materials 3. Furthermore, the fixing bars 21 and the holding members 23 may be provided along the inner periphery of the roof frame 22 as needed.

[0032] Sheet-like solar cells 11 are placed on the underside of the transparent roofing material 3 and fixed to the roof 4 by sandwiching their edges between the fixing bars 21 and the roofing material 3. The size and shape of the sheet-like solar cells 11 are such that their edges can be sandwiched between the fixing bars 21 and the roofing material 3. The sheet-like solar cells 11 may be, for example, a single sheet of solar cells having approximately the same size and shape as the transparent roofing material 3. The sheet-like solar cells 11 may be short in width or length so that multiple sheets are arranged vertically or horizontally on each roofing material 3. The sheet-like solar cells 11 may be installed on the roof 4 at the same time as the installation of the roof 4, or may be attached to an existing roof 4 later.

[0033] In this case, the sheet-like solar cells 11 are either in close contact with the back surface of the transparent roofing material 3 or are spaced apart with a gap. In this embodiment, by sandwiching the edges between the fixing bars 21 and the roofing material 3, the sheet-like solar cells 11 are in almost close contact with the back surface of the transparent roofing material 3.

[0034] (3) In the above solar cell installation structure, as shown in FIG. 5 (FIG. 6), The roof portion 4 may have a support beam 31 that supports the fixed beam 21 from below. The sheet-like solar cells 11 may be fixed by being sandwiched between the roof material 3 and spacers 32 attached to the upper part of the support beams 31 .

[0035] Here, the support bar 31 is a bar member that is provided on the roof frame 22 as needed to support the fixed bar 21 from below. The support bar 31 extends below the fixed bar 21 on the roof frame 22 in a direction perpendicular to the fixed bar 21 so as to separate the roof frame 22. In this embodiment, the support bar 31 extends in the vertical direction of the roof frame 22. Because the support bar 31 is provided below the fixed bar 21, a gap is formed between the sheet-like solar cells 11 and the support bar 31. The support bar 31 is a separate member from the fixed bar 21, but depending on the configuration of the roof section 4, they may be an integrated member.

[0036] The spacers 32 are gap-filling members inserted into the gaps between the sheet-like solar cells 11 and the support beams 31. The spacers 32 can be made of a hard material that is almost elastically resistant to deformation, or soft material that is elastically deformable, such as rubber, urethane, or silicone rubber. The hard spacers 32 are approximately the same thickness as the gap or slightly thicker. The soft spacers 32 are preferably thicker than the gap and installed in the gap in a compressed state. The spacers 32 are attached to the top of the support beams 31 to press the sheet-like solar cells 11 against the roofing material 3 from below. The spacers 32 can appropriately press the sheet-like solar cells 11, for example, at the middle or edge of the surface. The sheet-like solar cells 11 can be secured by the spacers 32 in addition to being sandwiched between the fixing beams 21 and the roofing material 3. However, structurally, they can also be secured by the spacers 32 alone. In this case, the sheet-like solar cells 11 are preferably made of a hard material that is sufficiently rigid to retain their shape.

[0037] (4) In the above solar cell installation structure, as shown in FIG. The sheet-like solar cells 11 may be installed over the entire surface of all the roof materials 3 provided on the roof portion 4.

[0038] Here, being installed over the entire surface of all roofing materials 3 means that sheet-like solar cells 11 are installed so as to cover almost the entire surface from below of each roofing material 3 that constitutes the roof portion 4. Sheet-like solar cells 11 are used that are approximately the same size and shape as the roofing materials 3. In this case, it is preferable that all roofing materials 3 are colorless and transparent to increase power generation efficiency.

[0039] In this case, the sheet-like solar cells 11 structurally block most of the sunlight, so that the roof 4 either does not transmit much sunlight or has low transmittance for sunlight, making the space below the roof 4 dark.

[0040] (5) In the above solar cell installation structure, as shown in FIGS. 7 to 9, The sheet-shaped solar cells 11 may be installed on a part of the roof material 3 provided on the roof portion 4.

[0041] Here, being installed on a portion of the roofing material 3 means that the sheet-shaped solar cells 11 are installed on the entire surface or a portion of a portion of the roofing material 3 that constitutes the roof portion 4, or that they are installed locally on all of the roofing materials 3 that constitute the roof portion 4. As a result, the roof portion 4 has areas 41 where the sheet-shaped solar cells 11 are not installed. Alternatively, the roof portion 4 has areas where the sheet-shaped solar cells 11 are installed and areas where they are not installed 41. To form the areas where they are not installed 41, sheet-shaped solar cells 11 that are approximately the same size and shape as the roofing material 3 or that are smaller than the roofing material 3 are used as appropriate.

[0042] In this case, to increase power generation efficiency, it is preferable that the installed portion of the roofing material 3 is colorless and transparent. Also, the non-installed portion 41 of the roofing material 3 may be either colorless and transparent or colored and transparent, but colored and transparent is preferable to obtain a sunshade effect.

[0043] Furthermore, since the roofing material 3 has portions 41 where the sheet-like solar cells 11 are not installed that allow sunlight to pass through, the space below becomes brighter than when the sheet-like solar cells 11 are installed over the entire surface.

[0044] 7, for example, sheet-like solar cells 11 may be installed on every other roofing material 3 on the roof portion 4. As a result, the roof portion 4 has a striped pattern of installed solar cells 11 and non-installed portions 41.

[0045] 8, the sheet-like solar cells 11 may be installed only on the middle roof material 3 of the roof portion 4, excluding both ends in the vertical direction. This results in non-installation portions 41 on both sides (front and back) of the roof portion 4 in the vertical direction.

[0046] 9, the sheet-like solar cells 11 may be installed in the horizontal middle of the roof 4, excluding both ends of all roofing materials 3. This leaves both horizontal sides of the roof 4 as non-installed areas 41. In the case of a carport in this embodiment that is sloped to one side in the horizontal direction, the upper and lower sloped portions of the roof 4 become elongated non-installed areas 41 along the vertical direction.

[0047] The manner in which the installed portions and non-installed portions 41 of the sheet-like solar cells 11 are arranged on the roof portion 4 is not limited to the above.

[0048] (6) In the above solar cell installation structure, as shown in FIGS. 10 and 11, The sheet-shaped solar cell 11 may have a plurality of cells 52 inside a battery body 51 . The plurality of cells 52 may be arranged along the short side direction 53 or the long side direction 54 of the battery body 51 .

[0049] Here, the sheet-like solar cell 11 has a cell body 51 that is a resin sheet. The resin forming the cell body 51 may be soft or hard.

[0050] The battery body 51 has a substantially rectangular power generation region 55 therein, and a plurality of cells 52 serving as power generation elements are formed inside this power generation region 55. For example, in the case of a perovskite solar cell, the cells 52 are made of perovskite. In the case of a solar cell other than a perovskite solar cell, the cells 52 are power generation elements other than perovskite. The plurality of cells 52 each have substantially the same size and shape (rectangular) and are arranged along either the short side direction 53 or the long side direction 54 of the battery body 51. For example, as shown in FIG. 10 , when the cells 52 are arranged along the short side direction 53 of the battery body 51, the cells 52 extend in the long side direction 54. Furthermore, as shown in FIG. 11 , when the cells 52 are arranged along the long side direction 54 of the battery body 51, the cells 52 extend in the short side direction 53.

[0051] In sheet-shaped solar cells 11, it is possible to select whether the cells 52 are arranged in a short side direction 53 or a long side direction 54 of the battery body 51, depending on the installation orientation of the roof part 4. The arrangement of cells 52 affects the power generation efficiency of sheet-shaped solar cells 11.

[0052] That is, each cell 52 is an element that generates electricity using sunlight, and generates electricity when sunlight hits the entire cell 52, and stops generating electricity when sunlight does not hit the entire cell 52 due to a shadow cast on the cell 52. For example, if there is a building 1 or tree that is taller than the roof 4 around the roof 4, the roof 4 will be shaded, causing some cells 52 to not generate electricity due to the shadow. Because the sun moves approximately from east to west, the shadow also moves east to west as the sun moves.

[0053] Therefore, by arranging the cells 52 of the sheet-shaped solar cell 11 along a substantially east-west direction, the proportion of cells 52 that are not shaded can be increased, and improvement in power generation efficiency can be expected. In this case, the cells 52 are shaped to extend substantially north-south.

[0054] Specifically, when cells 52 are arranged in a short-side direction 53 of a battery body 51 (see cell 52(A) in FIG. 1) as shown in Fig. 10, it is preferable that the battery body 51 is installed with the short side facing approximately east-west. In this case, the long side of the battery body 51 faces north-south, and the cells 52 extend north-south (long-side direction 54).

[0055] On the other hand, when the cells 52 are arranged in the long side direction 54 of the battery body 51 as shown in Fig. 11 (see cell 52(B) in Fig. 1), it is preferable that the battery body 51 is installed with the long side facing approximately east-west. In this case, the short side of the battery body 51 faces north-south, and the cells 52 extend north-south (short side direction 53).

[0056] In reality, it is difficult to orient the battery body 51 precisely east-west or north-south, and in most cases the battery body 51 is oriented in a direction between east-west and north-south. In such a case, the cells 52 of the battery body 51 may be arranged along the direction closer to east-west, either the short side direction 53 or the long side direction 54.

[0057] However, the above is a device for improving power generation efficiency when only the movement of the sun and the movement of shadows are taken into consideration. The arrangement of cells 52 in battery body 51 is affected by various factors other than the movement of the sun, such as the influence of the arrangement and shape of the corrugated roof and the influence of surrounding buildings 1. Therefore, it is preferable to determine the arrangement of cells 52 comprehensively, taking these factors into consideration.

[0058] As shown in FIG. 10(b), the sheet-like solar cell 11 has a structure in which cells 52 and the like are arranged in the space between a parallel resin back sheet 56 and a transparent resin front sheet 57, and then sealed with resin (sealing resin 58). The entire exterior of the sheet-like solar cell 11, including the front and back surfaces, may be covered with a transparent protective layer 59. The transparent protective layer 59 may be formed by applying a transparent resin curing agent that has weather resistance, waterproofing, and physical strength as a protective material (top coat). The sheet-like solar cell 11 is then attached by sandwiching the margins appropriately provided around the periphery of the power generation area 55 between the fixing bars 21 and the roofing material 3.

[0059] (7) In the above solar cell installation structure, as shown in FIG. 12 (FIG. 2), The sheet-shaped solar cells 11 may be arranged such that the junction box 61 and the wiring 62 are disposed around the sides 22a and 22b of the roof portion 4.

[0060] Here, the junction box 61 is a connector or box-shaped body that is installed at the connection point between electric wires during electrical work, and is used to simplify the route of the wiring 62 and make it easier to connect the wiring 62.

[0061] In the case of a perovskite solar cell, the junction box 61 (internal junction box 61a) is provided in the sheet-like solar cell 11 itself. The internal junction box 61a is attached, for example, to the periphery of the cell body 51, either inside the power generation region 55, in a blank space on the periphery, or in the boundary between the power generation region 55 and the blank space.

[0062] In addition, the junction box 61 is also provided as appropriate outside the sheet-shaped solar cells 11 in order to connect the sheet-shaped solar cells 11 to each other (external junction box 61b (connector), FIG. 12).

[0063] The wiring 62 is an electric wire that conducts electricity. In the case of a sheet-shaped solar cell 11, the wiring 62 is provided inside the sheet-shaped solar cell 11 (internal electrode 62a, FIG. 10(b)). The wiring 62 is also provided outside the sheet-shaped solar cell 11 (external wiring 62b) to connect the sheet-shaped solar cells 11 to each other. The external wiring 62b is connected as appropriate using an external junction box 61b (connector) or the like.

[0064] The sides 22a, 22b of the roof portion 4 are one or more of the pair of vertical sides 22a and the pair of horizontal sides 22b that make up the roof frame 22, which is substantially rectangular in plan view. The periphery of the sides 22a, 22b refers to the sides 22a, 22b or the vicinity of the sides 22a, 22b. The junction box 61 and the wiring 62 may be provided on either side 22a, 22b of the roof frame 22.

[0065] In this embodiment, as shown in Fig. 1, the roof portion 4 is inclined downward from the building 1 side to the opposite side, and the junction box 61 and wiring 62 are provided on the lower vertical side 22a that is farthest from the building 1, as shown in Fig. 2. The junction box 61 is provided for each sheet-like solar cell 11 at a position along the side 22a.

[0066] (8) In the above solar cell installation structure, as shown in FIG. The roof portion 4 is supported by pillars 71, The wiring 62 extending from the sheet-shaped solar cells 11 may be installed along the pillars 71.

[0067] Here, pillars 71 are vertical members that support roof portion 4. Pillars 71 may be formed of hollow metal members or the like. For example, in the case of a carport or cycle port, roof portion 4 is supported by pillars 71. Also, in the case of a front porch or the like, roof portion 4 may or may not be supported by pillars 71. That is, large roof portions 4 are likely to be provided with pillars 71, while small roof portions 4 are likely not to be provided with pillars 71 because they are attached directly to building 1 and become fixed to building 1 and are held in place by building 1. In the case of small roof portions 4 that do not have pillars 71, junction boxes 61 and wiring 62 are installed around sides 22a and 22b of building 1, and wiring 62 is led directly to building 1.

[0068] The pillars 71 are provided, for example, at or near corners of the roof section 4. If necessary, one or more additional pillars 71 may be provided, for example, in the middle of the sides 22a and 22b of the roof section 4. The lower ends of the pillars 71 are buried in the ground, and the roof section 4 is attached to the upper ends. The pillars 71 may directly support the roof section 4, or a cross beam 72 (FIG. 2) may be provided at the upper end, either integrally or separately, to support the roof section 4 via the cross beam 72. The cross beam 72 may be cantilevered by the pillars 71, or may be bridged between the upper ends of adjacent pillars 71 in a double-supported state. The cross beam 72 may be provided separately from the support beams 31 described above, or may be integrated with the support beams 31 and used as the support beams 31.

[0069] In the carport of this embodiment, the roof portion 4, which is inclined to one side, is supported by a diagonal cross beam 72 which is integrally attached in a cantilevered state to the upper end of a pillar 71 provided on one side (the lower side of the slope).

[0070] The wiring 62 (external wiring 62b) is led from the lower edge 22a of the roof portion 4 to the pillar 71. This wiring 62 may be installed, for example, along the inside or interior of the pillar 71. The wiring 62 may also be installed, for example, along the outside or outer surface of the pillar 71. If there is no pillar 71, the wiring 62 may be led directly to the building 1 as described above.

[0071] (9) In the above solar cell installation structure, as shown in FIG. The power conditioner 81 with the sheet-shaped solar cells 11 may be installed in the building 1.

[0072] Here, power conditioner 81 is an electrical control device that converts DC power into AC power so that the electricity generated by solar cells 5 can be used in building 1. Power conditioner 81 is provided separately from sheet-like solar cells 11, and is connected to sheet-like solar cells 11 by wiring 62.

[0073] The wiring 62 (external wiring 62b) installed on the pillar 71 is, for example, led from the lower end of the pillar 71 to the building 1 while buried in the ground, passed through the inside of the building 1, and connected to a power conditioner 81 installed inside the building 1.

[0074] <Operation> The operation of this embodiment is as follows.

[0075] Sheet-like solar cells 11 are installed on a roof 4 having a transparent roofing material 3. The sheet-like solar cells 11 may be attached to an existing roof 4 or to a newly constructed roof 4. The attachment of the sheet-like solar cells 11 to the roof 4 may be performed on-site, or at least partly in a factory.

[0076] Sheet-like solar cells 11 are installed on the back surface of roof material 3 of roof portion 4. Sheet-like solar cells 11 are preferably formed in approximately the same shape (width, length, etc.) as the planar shape of roof material 3 of roof portion 4.

[0077] In this case, the edges of the sheet-like solar cells 11 can be sandwiched and fixed between the roof material 3 and the fixing bars 21 that fix the roof portion 4. Alternatively, the sheet-like solar cells 11 can be sandwiched and fixed between the roof material 3 and spacers 32 attached to the upper part of the support bars 31. Fixation by sandwiching between the fixing bars 21 and the roof material 3 and fixation by sandwiching between the spacers 32 and the roof material 3 may be combined as appropriate. This allows the sheet-like solar cells 11 to be easily attached to the roof material 3 of the roof portion 4.

[0078] The sheet-like solar cells 11 may be installed on the entire surface of all of the roofing materials 3 provided on the roof portion 4, or may be installed on only a portion of the roofing materials 3 provided on the roof portion 4. In this way, the sheet-like solar cells 11 are installed on the roof portion 4 and are integrated with the roof portion 4.

[0079] The wiring 62 of the sheet-like solar cells 11 is led from the periphery of the sides 22a and 22b of the roof portion 4 through the pillars 71 to the building 1 and connected to a power conditioner 81 installed in the building 1.

[0080] <Effects> The effects of this embodiment are as follows.

[0081] (Effect 1) Sheet solar cells 11 have a high degree of freedom in size and shape, so they do not need to be made into panel-like modules with a fixed size and shape, as are silicon-based solar cells 5. Therefore, sheet solar cells 11 can be processed and formed into shapes and sizes that fit various shapes of roof sections 4 installed outdoors 2 of building 1, and can be easily installed on roof sections 4. In particular, perovskite solar cells can be formed into a sheet shape, making them suitable for long roof sections 4. Furthermore, sheet solar cells 11 are lightweight and do not impose a burden on roof sections 4, so there is no need to reinforce roof sections 4 to accommodate the weight of sheet solar cells 11.

[0082] Such sheet-like solar cells 11 may be installed on the back surface of a transparent roofing material 3. In this way, the sheet-like solar cells 11 are integrated with the transparent roofing material 3, and the roof portion 4 has an appearance in which the installation of the solar cells 5 is not apparent. The sheet-like solar cells 11 can generate electricity using sunlight that passes through the transparent roofing material 3. Furthermore, since the surface of the sheet-like solar cells 11 is protected by the transparent roofing material 3, waterproofing and damage caused by flying objects are suppressed without incurring any cost. In addition, since ultraviolet rays are also suppressed by the transparent roofing material 3, the sheet-like solar cells 11 are less susceptible to deterioration and have improved durability.

[0083] In this case, the sheet-like solar cells 11 (e.g., perovskite solar cells) can be attached directly to the upper surface of the roof 4 using, for example, an adhesive or adhesive tape (double-sided tape). However, in this case, access to the solar cells 5 requires working at a height from above the roof 4, which requires scaffolding or the like. Furthermore, the strong attachment of the solar cells 5 to the upper surface of the roof 4 makes maintenance or replacement of the solar cells 5 almost impossible.

[0084] However, in this embodiment, the sheet-like solar cells 11 are installed on the back surface of the transparent roofing material 3. In this way, the sheet-like solar cells 11 can be easily accessed from the underside of the roof portion 4, so work can be done at a low altitude, eliminating the need for scaffolding or the like.

[0085] Furthermore, by placing the sheet-like solar cells 11 on the back surface of the transparent roofing material 3, they are protected by the transparent roofing material 3, and therefore do not need to be firmly attached to the roofing material 3. Therefore, the sheet-like solar cells 11 can be weakly adhered to the back surface of the transparent roofing material 3 so that they can be easily peeled off. This makes maintenance and replacement of the solar cells 5 possible and easy.

[0086] The sheet-like solar cells 11 may be attached to the back surface of the transparent roofing material 3 on-site or in advance at a factory.

[0087] When performing on-site installation, the sheet-like solar cells 11 can be installed at the same time as a new roof portion 4 is constructed, or can be attached to an existing roof portion 4 afterward.

[0088] Furthermore, by attaching (loosely attaching) the sheet-like solar cells 11 to the back surface of the transparent roofing material 3 in advance at a factory, the sheet-like solar cells 11 become an integral part of the back surface of the transparent roofing material 3. This eliminates the need to attach the sheet-like solar cells 11 to the back surface of the transparent roofing material 3 on-site, thereby reducing the man-hours required for constructing the roof portion 4 on-site.

[0089] Instead of or in addition to the weak attachment, the sheet-like solar cells 11 may be installed on the back surface of the transparent roofing material 3 as follows.

[0090] (Effect 2) The sheet-shaped solar cells 11 may be fixed by sandwiching them between the fixing bars 21 and the roofing material 3. This eliminates the need for special fixing members for the sheet-shaped solar cells 11, and they can be easily fixed to the roof 4 at low cost.

[0091] Furthermore, by sandwiching and fixing the sheet-like solar cells 11 between the fixing bars 21 and the roofing material 3, they can be detached and replaced, facilitating maintenance.

[0092] (Effect 3) The sheet-shaped solar cells 11 may be sandwiched between the roof material 3 and spacers 32 attached to the upper part of the support beams 31. This allows the sheet-shaped solar cells 11 to be fixed to the roof 4 easily and at low cost simply by using the spacers 32.

[0093] Furthermore, sheet-like solar cells 11 can be detached and replaced by being fixed by sandwiching them between spacers 32 and roofing material 3, which facilitates maintenance.

[0094] (Effect 4) The sheet-like solar cells 11 may be installed over the entire surface of all the roof materials 3 of the roof portion 4. This allows the sheet-like solar cells 11 installed on the roof portion 4 to maximize the amount of power generation.

[0095] (Effect 5) Because the sheet-like solar cells 11 block sunlight, the roof portion 4 does not transmit sunlight or has low transmittance. Therefore, by installing the sheet-like solar cells 11 on a portion of the roofing material 3, the roof portion 4 can ensure the required amount of power generation while also ensuring natural light from the remaining non-installed portion 41 where the sheet-like solar cells 11 are not installed.

[0096] (Effect 6) In the sheet-shaped solar cell 11, the cells 52 may be arranged along either the short side direction 53 or the long side direction 54 of the battery body 51. This allows the cells 52 to be arranged in the sheet-shaped solar cell 11 while taking into consideration the effects of shadows. In particular, it is preferable to arrange the cells 52 along the side of the short side direction 53 or the long side direction 54 of the battery body 51 that faces closer to east-west. This reduces the effects of shadows on the sheet-shaped solar cell 11, and is therefore expected to improve power generation efficiency.

[0097] (Effect 7) In the sheet-like solar cells 11, the junction box 61 and wiring 62 may be installed around the sides 22a, 22b of the roof portion 4. In this way, the junction box 61 and wiring 62 are bundled along the sides 22a, 22b of the roof portion 4, making them easier to handle, and are protected from rainwater and ultraviolet rays by the roof material 3. Furthermore, by providing the pressing members 23 and the like on the roof portion 4, the roof portion 4 can also obtain the effect of hiding the junction box 61 and wiring 62 by the pressing members 23 and the like. Therefore, the junction box 61 and wiring 62 are further protected from rainwater and ultraviolet rays by the pressing members 23 and the like.

[0098] (Effect 8) The wiring 62 extending from the sheet-like solar cells 11 may be installed along the pillars 71 supporting the roof portion 4. In this way, the wiring 62 is installed on the pillars 71 so as not to get in the way. By installing the wiring 62 inside the pillars 71, the wiring 62 is protected by the pillars 71. By installing the wiring 62 outside the pillars 71, maintenance is made easier.

[0099] (Effect 9) The power conditioner 81 with the sheet-like solar cells 11 may be installed on the building 1. This allows the roof 4 to simply have the solar cells 5 attached, simplifying the structure around the roof 4. [Explanation of symbols]

[0100] 1. Building 2. Outdoors 3. Permeable roofing materials 4 Roof 5. Solar cells 11 Sheet solar cells 21 Fixed bar 22 Roof frame Around 22a Around 22b 31 Support beam 32 spacer 52 cells 53 Short side direction 54 Long side direction 61 Junction Box 62 Wiring 71 pillars 81 Power conditioner

Claims

1. A solar cell installation structure in which solar cells are installed on a roof portion having a transparent roof material provided outdoors of a building, The solar cell installation structure is characterized in that the solar cells are sheet-shaped solar cells and are installed on the back surface of the transparent roofing material.

2. The solar cell installation structure according to claim 1, The roof portion has a fixing bar on the underside of the roof material for fixing the roof material, The solar cell installation structure is characterized in that the sheet-shaped solar cells are sandwiched and fixed between the fixing bar and the roof material.

3. The solar cell installation structure according to claim 2, the roof portion has a support bar that supports the fixed bar from below, The solar cell installation structure is characterized in that the sheet-shaped solar cells are sandwiched and fixed between spacers attached to the upper part of the support beams and the roof material.

4. The solar cell installation structure according to any one of claims 1 to 3, A solar cell installation structure, characterized in that the sheet-shaped solar cells are installed over the entire surface of all of the roof materials provided on the roof portion.

5. The solar cell installation structure according to any one of claims 1 to 3, A solar cell installation structure, characterized in that the sheet-shaped solar cells are installed on a part of the roof material provided on the roof portion.

6. The solar cell installation structure according to any one of claims 1 to 3, The sheet-shaped solar cell has a plurality of cells inside a battery body, A solar cell installation structure characterized in that the plurality of cells are arranged along the short side direction or the long side direction of the battery body.

7. The solar cell installation structure according to any one of claims 1 to 3, The solar cell installation structure is characterized in that the sheet-shaped solar cells have a junction box and wiring installed around the edge of the roof portion.

8. The solar cell installation structure according to any one of claims 1 to 3, The roof portion is supported by columns, A solar cell installation structure, characterized in that wiring extending from the sheet-like solar cells is installed along the pillars.

9. The solar cell installation structure according to any one of claims 1 to 3, A solar cell installation structure characterized in that the sheet-shaped solar cell power conditioner is installed in the building.

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