Fireproof non-combustible board, solar power generation system and installation method thereof

Abstract

To provide a fireproof nonflammable board capable of preventing fire from spreading to a roof when a module or a cable catches fire, a photovoltaic power generation system and its laying method.SOLUTION: In a residential photovoltaic power generation system including a solar cell module 1 integrated with a building material, a nonflammable board 41 for eaves and a nonflammable board 42 for general use are provided between the solar cell module 1 and a roofing 7 as nonflammable boards for fire protection which are members different from the solar cell module 1 and are arranged separately from the solar cell module 1. A cable 11 and a connector 12 led out from the solar cell module 1 are placed on these fireproof nonflammable boards.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a fire-retardant board, a solar power generation system, and a method for installing the same. [Background technology]

[0002] A residential solar power generation system is formed by installing a solar cell module on the roof of a house using a mounting frame, installation fittings, etc. As the solar cell module used in a residential solar power generation system, a solar cell module that is integrated into the building material (a solar cell module is built into the roof material) is widely used (for example, Patent Documents 1 and 2). The roof of a typical house is structured with roofing materials such as tiles and slates placed on components such as rafters, sheathing boards (roof underlayment), and roofing (waterproof sheet). A solar cell module that is integrated into the building material can be installed in the same way as roofing tiles are laid on top of the roofing.

[0003] Solar cell modules can be broadly classified into four types: "roof-mounted type," "steel plate, etc. installed type," "steel plate, etc. attached type," and "no steel plate, etc. type." Of these, the "steel plate, etc. installed type," "steel plate, etc. attached type," and "no steel plate, etc. type" correspond to solar cell modules integrated into building materials.

[0004] A tile-shaped solar cell module of the "steel plate, etc. laid type" is one in which a non-combustible material such as a steel plate is laid on the surface of the roofing directly below the module, and the module is then installed on top of that. A tile-shaped solar cell module of the "steel plate, etc. attached type" is one in which a non-combustible material such as a steel plate is attached to the back of the module, and the module with the steel plate, etc. attached, is installed directly on top of the roofing. A tile-shaped solar cell module of the "no steel plate, etc. type" is one in which a module without a steel plate, etc. attached to the back of the module is installed directly on top of the roofing.

[0005] The Consumer Safety Investigation Committee published an investigation report (Non-Patent Document 1) on January 28, 2019. Non-Patent Document 1 reports an example of a "steel plate-less" solar cell module in which an experiment confirmed the process of fire spreading from the module to the roof (roof boards) when the module was assumed to have caught fire, and describes the need for fire prevention measures to prevent such fire spread. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-147286 A [Patent Document 2] JP 2013-249582 A [Non-patent literature]

[0007] [Non-Patent Document 1] Consumer Safety Investigation Committee "Report on self-cause investigation based on the provisions of Article 23, Paragraph 1 of the Consumer Safety Act / Fire accidents caused by residential solar power generation systems" Summary of the Invention [Problem to be solved by the invention]

[0008] In the event of a fire occurring in a solar cell module integrated into a building material or in a cable pulled out from the module, there is a risk of serious damage due to the proximity of the source of fire to the roof. As there is a possibility of fire spreading to the sheathing board or roofing in "non-steel plate type" solar cell modules, it is important to improve safety, as proposed in Non-Patent Document 1.

[0009] In addition, in a tile-shaped solar cell module with a "steel plate, etc. attached" cable is installed directly on the roofing. For this reason, Non-Patent Document 1 states that even in a tile-shaped solar cell module with a "steel plate, etc. attached" cable, there is a risk of the fire spreading to the roof if the cable catches fire.

[0010] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a residential solar power generation system and an installation method thereof that can prevent fire from spreading to the roof in the event of a fire breaking out in a module or cable. [Means for solving the problem]

[0011] The first aspect of the present invention is a fire-resistant non-combustible board having non-combustible properties, characterized in that it comprises a flat panel main body portion having a rectangular shape when viewed from above, a bent engaging portion provided at one end edge extending in the longitudinal direction of the panel main body portion and engaged with an engaged member, and a flat portion provided on the opposite side of the panel main body portion relative to the bent engaging portion and connected to another panel main body portion.

[0012] In addition, a solar power generation system which is a second aspect of the present invention is a solar power generation system including at least one solar cell module, in which a fire-resistant non-combustible board which is a separate member from the solar cell module and has non-combustible properties is provided between a roofing of a predetermined slope and the solar cell module, the fire-resistant non-combustible board has a folded engagement portion which engages with a batten extending on the roofing in a direction perpendicular to the gradient direction, and multiple fire-resistant non-combustible boards adjacent in the gradient direction are arranged with the ridge side edge of one fire-resistant non-combustible board connected to the eaves side edge of the other fire-resistant non-combustible board.

[0013] In addition, a third aspect of the present invention is a method for installing a solar power generation system including at least one solar cell module, and includes a first step of placing a fire-resistant non-combustible board, which is a separate member from the solar cell module and has non-combustible properties, on roofing with a predetermined gradient, and engaging a folded engagement portion provided on the fire-resistant non-combustible board with a batten extending in a direction perpendicular to the gradient direction, and a second step of placing the solar cell module on the fire-resistant non-combustible board engaged with the batten, with a fixing member interposed therebetween, characterized in that in the first step, multiple fire-resistant non-combustible boards adjacent to each other in the gradient direction are placed by connecting the ridge side edge portion of one fire-resistant non-combustible board with the eaves side edge portion of the other fire-resistant non-combustible board.

[0014] In addition, a solar power generation system according to a fourth aspect of the present invention comprises battens arranged at intervals on a roof substrate, solar cell modules laid on the battens, and a fire-resistant non-combustible board arranged between the battens and the solar cell modules, and the fire-resistant non-combustible board has an upwardly convex folded engagement portion that is placed on the battens and engages with the battens.

[0015] In addition, a fifth aspect of the present invention is a method for installing a solar power generation system, which is a method for installing a solar power generation system described above, characterized in that the folded engagement portion of the fire-resistant non-combustible board is placed on the battens from above, the upper surface of the roof underlayment located between adjacent battens is covered by the panel main body portion, a fixing bracket attached to the solar cell module is placed on top of the folded engagement portion, and the fixing bracket is secured to the battens by clamping the upper surface of the folded engagement portion and tightening it together with screws. Effect of the Invention

[0016] The fireproof non-combustible plate, solar power generation system, and installation method of the present invention have the effect of preventing the spread of fire to the roof in the event of a fire breaking out in the module or cable by the fireproof non-combustible plate or holding tray portion, thereby providing a residential solar power generation system with high fire resistance. [Brief description of the drawings]

[0017] [Figure 1] 1 is a plan view showing a schematic configuration of a solar cell module used in a residential solar power generation system of the present invention. [Diagram 2] 2 is a cross-sectional view including the end portions on the eaves side and the ridge side of the solar cell module of FIG. 1. [Diagram 3] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 4] 3A and 3B are a plan view and a cross-sectional view of a non-combustible eaves board used in the residential solar power generation system according to the first embodiment. [Diagram 5] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 6] 1A and 1B are diagrams showing a rear fixing member used in the residential solar power generation system according to the first embodiment, where (a) is a plan view and (b) is a cross-sectional view taken along the line AA of (a). [Figure 7] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 8] 1A and 1B are a plan view and a cross-sectional view of a general-purpose noncombustible board used in a residential solar power generation system according to a first embodiment. [Figure 9] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 10] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 11] FIG. 11 is a plan view showing how the solar cell module and the fire-retardant board overlap. [Figure 12] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 13] FIG. 2 is a cross-sectional view illustrating a midway state of installation of the residential solar power generation system according to the first embodiment. [Figure 14]FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a second embodiment. [Figure 15] FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a third embodiment. [Figure 16] FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a fourth embodiment. [Figure 17] FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a fourth embodiment. [Figure 18] FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a fourth embodiment. [Figure 19] FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] [First embodiment] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0019] <Solar cell module configuration> First, the basic configuration of the solar cell module 1 used in the residential solar power generation system of the present invention will be described with reference to Fig. 1 and Fig. 2. The solar cell module 1 is a solar cell module integrated with building materials that can be installed like roofing tiles on roofing. Here, the solar cell module 1 is a "steel plate-less type" solar cell module. The solar cell module 1 itself has a known configuration, so the configuration of the solar cell module 1 will be briefly described below.

[0020] Fig. 1 is a plan view showing a schematic configuration of a solar cell module 1. The solar cell module 1 is composed of a rectangular solar cell panel 2 that converts sunlight into electricity, and a frame 3 arranged on the periphery of the solar cell panel 2. The frame 3 is composed of four module frames attached to each of the four sides of the solar cell module. In the solar cell module 1, on two sides facing each other along the water flow direction of the roof, a front frame 31 attached to the eaves side and a rear frame 32 attached to the ridge side have different shapes.

[0021] The solar cell panel 2 is, for example, a solar cell sandwiched between one glass plate and a protective layer (back sheet) and sealed. Alternatively, a solar cell formed by sequentially laminating a transparent electrode film, a photoelectric conversion layer (semiconductor layer), and a back electrode film may be sandwiched between two glass plates, and the ends of each glass plate are sealed. To explain this solar cell panel 2 in more detail, a solar cell is formed by laminating a transparent electrode, a photoelectric conversion layer made of a semiconductor layer, and a back electrode layer in this order on a glass substrate as a light-transmitting substrate, and a light-transmitting glass substrate as a protective plate is attached to the back electrode layer side to seal the gap between each glass substrate.

[0022] 2 is a cross-sectional view including the eaves side and ridge side ends of the solar cell module 1. The front frame 31 and the rear frame 32 are made of, for example, an aluminum material, and the shape of the cross section perpendicular to the longitudinal direction is basically The cross-sectional structure of the front frame 31 and the rear frame 32 shown in Fig. 2 is merely an example, and the present invention is not limited to this structure.

[0023] A panel front end holding portion 311 having a generally U-shaped cross section with an opening on the ridge side is formed at the upper end of the front frame 31. The front end of the solar cell panel 2 is fitted into and held in the panel front end holding portion 311. The panel front end holding portion 311 and the solar cell panel 2 are bonded with an adhesive or the like, and this adhesion fixes the front frame 31 to the solar cell panel 2. A first engagement portion 312 extending approximately horizontally toward the ridge side is formed at the lower end of the front frame 31.

[0024] A panel rear end holding portion 321 having a generally U-shaped cross section with an opening on the eaves side is formed at the upper end of the front side of the rear frame 32. The rear end of the solar cell panel 2 is fitted into and held in the panel rear end holding portion 321. The panel rear end holding portion 321 and the solar cell panel 2 are bonded together with an adhesive or the like, and the rear frame 32 is fixed to the solar cell panel 2 by this adhesion.

[0025] A second engagement portion 322 having a generally L-shaped cross section is formed on the upper surface 32a of the rear frame 32. The second engagement portion 322 is formed on the lower surface 32b of the rear frame 32, and is erected downward from the lower surface 32b and is further bent toward the eaves side. The third engagement portion 323 is formed on the lower surface 32b of the rear frame 32, and is erected downward from the lower surface 32b and is further bent toward the eaves side. The third engagement portion 323 has a generally L-shaped cross section.

[0026] A reinforcing bar 33 for connecting and reinforcing the front frame 31 and the rear frame 32 may be provided on the back surface of the solar cell module 1. The reinforcing bar 33 has a front end connected to the front frame 31 and a rear end connected to the rear frame 32, thereby preventing the front frame 31 and the rear frame 32 from coming off the solar cell panel 2.

[0027] Next, the structure and installation procedure of the residential photovoltaic power generation system according to the first embodiment, that is, the roof mounting structure and installation procedure of the solar cell module 1 will be described with reference to Figs.

[0028] In the residential solar power generation system according to the present embodiment, a plurality of solar cell modules 1 can be installed on a sloped roof in the direction A of water flow, like roofing tiles. The solar cell modules 1 are arranged in an array not only in the direction A of water flow, but also in the horizontal direction (the direction perpendicular to the direction A of water flow). The solar cell modules 1 arranged in the horizontal direction in this manner are also connected to each other by a frame 3, but a well-known structure can be used for this connection structure, so a detailed description will be omitted here. The residential solar power generation system of the present invention is not limited to a configuration in which a plurality of solar cell modules 1 are arranged in an array, and may be configured to include at least one solar cell module 1.

[0029] When multiple solar cell modules 1 are installed along the water flow direction A, they are installed in order from the eaves side to the ridge side. For this reason, in the following description, the solar cell module 1 installed closest to the eaves side in a residential solar power generation system is referred to as the first row, and the solar cell modules 1 are counted as the second row, third row, and so on toward the ridge side.

[0030] The roof on which the residential solar power generation system is installed has roofing 7 laid on sheathing boards 6, and battens 8 for hanging roof tiles 5 and solar cell modules 1 are arranged at predetermined intervals on the roofing 7.

[0031] In the first stage of the installation work of a residential solar power generation system, as shown in Fig. 3, roof tiles 5 are attached to the roof closest to the eaves. Specifically, the rear end of the roof tile 5 is hooked onto a crosspiece 8 and fixed to the crosspiece 8 with a wood screw or the like. At this time, a front fixing bracket 91 is placed on the rear end portion of the top surface 5a of the roof tile 5, and the front fixing bracket 91 is fastened together with the roof tile 5 with a wood screw or the like. The front fixing metal fitting 91 forms a gap with an open eaves side between itself and the upper surface 5a of the roof tile 5, and the first engagement portion 312 of the front frame 31 is adapted to engage with this gap.

[0032] Once the roof tile 5 and front fixing bracket 91 are installed, the eaves non-combustible board 41 is placed on the ridge side of the roof tile 5, as also shown in Fig. 3. The eaves non-combustible board 41 is placed below the first row of solar cell modules 1, and is a fire-resistant non-combustible board that prevents the spread of fire to the roof in the event of a fire from the modules or cables of the solar cell modules 1. There are no particular limitations on the material of the eaves non-combustible board 41 as long as it is non-combustible, but steel plate or the like can be preferably used.

[0033] 4 is a plan view and a cross-sectional view of the eaves non-combustible board 41. At the front end (eaves side end) of the eaves non-combustible board 41, a bent portion 411 is formed which stands upward and is further bent toward the eaves side to have a generally L-shaped cross section. At the rear end (ridge side end) of the eaves non-combustible board 41, a convex portion 412 which is convex upward and has a generally U-shaped cross section is formed. At the rear of the convex portion 412 (ridge side), a flat portion 413 is formed and connected. In addition, the eaves non-combustible board 41 may be appropriately provided with a drainage groove or drainage hole for draining rainwater flowing over the eaves non-combustible board 41.

[0034] The eaves noncombustible board 41 is placed so that the bent portion 411 is placed on the rear end of the roof tile 5 and the protruding portion 412 is placed on the crosspiece 8. The eaves noncombustible board 41 placed in this manner can be installed with a certain amount of space between it and the roofing 7 (i.e., separated from the roofing 7). Furthermore, the protruding portion 412 is caught on the crosspiece 8, which has the effect of preventing the eaves noncombustible board 41 from sliding down the sloped roof due to gravity during construction, thereby improving workability.

[0035] The distance between the eaves noncombustible board 41 and the roofing 7 is, for example, 1 to 14 mm. Furthermore, by making the distance 3 mm or more, water can flow more easily over the roofing 7, and safety in the event of a fire can be improved compared to when the roofing 7 is in contact with the eaves noncombustible board 41. Furthermore, since the height of a typical crosspiece 8 is about 15 mm, making the distance 10 mm or less makes it easier for the protrusions 412 to catch on the crosspiece 8.

[0036] Once the eaves non-combustible board 41 is placed, the first row of solar cell modules 1 are installed on top of it, as shown in Fig. 5. At this time, the cables 11 and connectors 12 drawn from the first row of solar cell modules 1 are also placed on the eaves non-combustible board 41. Here, the cables 11 and connectors 12 correspond to the cable members described in the claims.

[0037] A rear fixing bracket 92 is used to install the solar cell modules 1 in the first row. Figure 6 shows the rear fixing bracket 92, where (a) is a plan view and (b) is a cross-sectional view taken along line AA of (a).

[0038] A fourth engagement portion 921 having a generally L-shaped cross section is formed at the front end (ridge side end) of the rear fixing bracket 92, standing upward and further bending toward the ridge side. The fourth engagement portion 921 may have a plurality of notches formed therein, as shown in FIG. 6(a). An engagement piece 922 is formed at the rear end (ridge side end) of the rear fixing bracket 92, standing downward. The engagement piece 922 is formed by making a plurality of slit-shaped cuts in the rear end of the rear fixing bracket 92 and bending the portion sandwiched between the cuts downward.

[0039] 5, as a preliminary step to installing the solar cell module 1, a rear fixing bracket 92 is attached to the solar cell module 1. Specifically, the rear fixing bracket 92 is attached to the solar cell module 1 by engaging the fourth engagement portion 921 of the rear fixing bracket 92 with the third engagement portion 323 of the rear frame 32.

[0040] The solar cell module 1 to which the rear fixing bracket 92 is attached is attached to the first engagement portion 31 of the front frame 31. 2 is engaged with the front fixing bracket 91, and the rear fixing bracket 92 is placed on the crosspiece 8. At this time, the engagement piece 922 of the rear fixing bracket 92 is located on the ridge side of the crosspiece 8, preventing the placed solar cell module 1 from sliding off due to gravity. The placed solar cell module 1 is installed (fixed) by fastening the rear fixing bracket 92 together with the eaves noncombustible board 41 that was placed earlier to the crosspiece 8 with wood screws or the like. For this reason, the eaves noncombustible board 41 has a plurality of screw holes 414 formed at predetermined intervals (see FIG. 4), and the rear fixing bracket 92 has a plurality of screw holes 923 formed at predetermined intervals (see FIG. 6).

[0041] When the first row of solar cell modules 1 is installed, as shown in Fig. 7, a general-purpose non-combustible board 42 is placed on the ridge side of the first row of solar cell modules 1. The general-purpose non-combustible board 42 is placed below the solar cell modules 1 in the second row and onwards, and is a fire-resistant non-combustible board to prevent the spread of fire to the roof in the event of a fire breaking out from the modules or cables of the solar cell modules 1. As with the eaves non-combustible board 41, the material of the general-purpose non-combustible board 42 is not particularly limited as long as it is non-combustible, but steel plate or the like can be preferably used.

[0042] 8 is a plan view and a cross-sectional view of the general-use non-combustible board 42. A convex portion 421 that is convex upward and has a generally U-shaped cross section is formed at the rear end (ridge side end) of the general-use non-combustible board 42. A flat plate portion 422 is formed and connected to the rear (ridge side) of the convex portion 421. The general-use non-combustible board 42 may also be appropriately provided with drainage grooves or drainage holes for draining rainwater, etc. that flows over the general-use non-combustible board 42. The general-use non-combustible board 42 also has a plurality of screw holes 423 formed at predetermined intervals.

[0043] The general-purpose noncombustible board 42 is placed with its front end (eaves side end) placed on the flat plate portion 413 of the eaves noncombustible board 41, and the protruding portion 421 placed on the crosspiece 8. The general-purpose noncombustible board 42 placed in this manner can be installed with a certain amount of space between it and the roofing 7. Furthermore, the protruding portion 421 is caught on the crosspiece 8, which has the effect of preventing the general-purpose noncombustible board 42 from sliding down the sloped roof due to gravity during construction, thereby improving workability.

[0044] The separation distance between the general-purpose noncombustible board 42 and the roofing 7 is, for example, 1 to 14 mm. Furthermore, by making the separation distance 3 mm or more, water can flow more easily over the roofing 7, and safety in the event of a fire can be improved compared to when the board is in contact with the roofing 7. Furthermore, since the height of a typical crosspiece 8 is about 15 mm, making the separation distance 10 mm or less makes it easier for the protrusions 421 to catch on the crosspiece 8.

[0045] Once the general-purpose non-combustible board 42 is placed, the second row of solar cell modules 1 are installed on top of it, as shown in Fig. 9. The cables and connectors drawn from the solar cell modules may be placed on the underside (backside) of the module, or may be pulled up to the module building side (i.e., not placed on the underside of the module). In this case, if the cables 11 and connectors 12 are placed on the underside (backside) of the solar cell modules 1, the cables 11 and connectors 12 drawn from the second row of solar cell modules 1 can also be placed on the general-purpose non-combustible board 42.

[0046] Furthermore, even if the cable 11 and the connector 12 are arranged on the underside (backside) of the solar cell module 1, the configuration is not limited to the cable 11 and the connector 12 being placed on the general-purpose non-combustible board 42. For example, the cable 11 and the connector 12 may be arranged between the solar cell module 1 and the fireproof non-combustible board by being attached to the backside of the solar cell panel 2 using some kind of member. Even with such a configuration, the general-purpose non-combustible board 42 still exists between the cable 11 and the connector 12 and the roof.

[0047] The installation method for the second row of solar cell modules 1 is roughly the same as that for the first row of solar cell modules 1. The only difference is that the first engagement portion 312 of the front frame 31 is engaged with the second engagement portion 322 of the rear frame 32 of the solar cell module 1 in the first row. The solar cell modules 1 in the third row and onwards are installed in the same manner as the solar cell modules 1 in the second row. Furthermore, roof tile 5 may be installed further towards the ridge of the solar cell module 1 in the last row (the one closest to the ridge), as shown in Fig. 10.

[0048] As described above, in the residential solar power generation system according to the first embodiment, the eaves non-combustible board 41 or the general-use non-combustible board 42, which is a fireproof non-combustible board, is arranged below the solar cell module 1, and these fireproof non-combustible boards are separate members from the solar cell module 1 and are separated from the solar cell module 1. The cables 11 and the connectors 12 can also be placed on these fireproof non-combustible boards. FIG. 11 is a plan view showing the overlapping state between the solar cell module 1 and the fireproof non-combustible boards. In FIG. 11, the fireproof non-combustible board (here, the general-use non-combustible board 42) is shown by hatching with oblique lines. As shown in FIG. 11, these fireproof non-combustible boards are interposed between the solar cell module 1 and the roof so as to completely cover the arrangement area of ​​the solar cell module 1.

[0049] Therefore, if the solar cell module 1 is a "steel plate-less type," even if a fire occurs in the module or cable, the fireproof noncombustible board prevents the fire from spreading to the roof, making it possible to provide a residential solar power generation system with high fireproof performance. Note that the cable 11 and connector 12 do not necessarily have to be placed on the fireproof noncombustible board, and they only need to be placed between the solar cell module 1 and the fireproof noncombustible board. Even in this case, the same effect as above can be obtained.

[0050] In the present invention, the solar cell module 1 is not limited to the "type without steel plates, etc." In other words, even if the solar cell module 1 is the "type with steel plates, etc.", the application of the present invention is effective because the spread of fire to the roof when a fire breaks out from the cable is prevented.

[0051] In addition, it is preferable that the eaves noncombustible board 41 and the general-use noncombustible board 42 have drainage grooves (or drainage holes) for draining water on the eaves noncombustible board 41 and the general-use noncombustible board 42, which are fire-resistant noncombustible boards, and preventing water from accumulating on these fire-resistant noncombustible boards. In other words, the water on the fire-resistant noncombustible boards can be configured to flow along the water flow direction A and be drained from the drainage groove provided on the fire-resistant noncombustible board or from the drainage groove of another fire-resistant noncombustible board installed on the eaves side. Furthermore, since these fire-resistant noncombustible boards are arranged away from the roofing 7, they do not obstruct the flow of water on the roofing 7. It is preferable that these drainage grooves are arranged between the screw hole 414 of the eaves noncombustible board 41 and the screw hole 423 of the general-use noncombustible board 42 in the horizontal direction of the roof (the direction perpendicular to the water flow direction A). At the locations of screw holes 414 and 423, the wood screws are inserted all the way into the subfloor 6, making these locations the weakest in terms of waterproofing, and it is preferable that these drainage grooves be located as far away as possible from these screw holes.

[0052] In the above-described residential solar power generation system, a normal roof tile 5 is installed on the eaves side of the solar cell module 1 in the first row, but the present invention is not limited to this. As shown in FIG. 12, the solar cell module 1 in the first row may be installed from the eaves side of the roof. In this case, the front fixing bracket 93 and the eaves non-combustible board 43 are first fastened together to the roof with wood screws or the like, and then the solar cell module 1 in the first row is installed. The installation method of the solar cell modules 1 in the second row and thereafter is the same as that described above. In addition, in FIG. 12, the eaves non-combustible board 43 is placed under the front fixing bracket 93, and the eaves non-combustible board 43 and the front fixing bracket 93 are fastened together to the roof, but as shown in FIG. 13, only the front fixing bracket 93 may be fixed to the roof with wood screws or the like, and the eaves non-combustible board 43' may be placed on the front fixing bracket 93. Although not shown, a member in which the eaves non-combustible board 43 and the front fixing bracket 93 are integrated may be used.

[0053] Furthermore, in a residential solar power generation system, it is necessary to provide an earth (ground) for each solar cell module 1. In a conventional residential solar power generation system, an earth connection is made between the solar cell modules included, but in the residential solar power generation system according to the first embodiment, the fixing metal fittings (front fixing metal fittings 91, 93 and rear fixing metal fitting 92) and the fireproof noncombustible boards (eaves noncombustible boards 41, 43 and general-use noncombustible board 42) are in contact with each other and are continuously conductive, so that a more reliable earth can be obtained by using these fixing metal fittings and the fireproof noncombustible boards as an earth path.

[0054] When using a fixing metal fitting or a fireproof non-combustible plate as an earth path, an earth spike (protrusion) (see Figs. 4 and 8) may be provided at any point (preferably at multiple points) on the contact surface with other components. At the points where such earth spikes are provided, a pressure contact force is generated between the contacting components, making the conduction between the components more reliable.

[0055] [Embodiment 2] In the above-mentioned first embodiment, the front fixing metal fittings 91 and the eaves non-combustible board 41 are used as separate members, and the rear fixing metal fittings 92 and the general-use non-combustible board 42 are used as separate members, but it is also possible to use these as an integrated member to reduce the number of parts. In other words, it is also possible to provide the fire-resistant non-combustible board with the functions of the front fixing metal fittings and the rear fixing metal fittings.

[0056] The residential solar power generation system according to the second embodiment uses a non-combustible board 44 for eaves having the function of a front fixing bracket and a general-purpose non-combustible board 45 having the function of a rear fixing bracket, as shown in FIG.

[0057] The eaves noncombustible board 44 is used as a fireproof noncombustible board for the first row of solar cell modules 1, and is also used as a front fixing metal fitting for the first row of solar cell modules 1. The general-use noncombustible board 45 is used as a fireproof noncombustible board for the second and subsequent rows of solar cell modules 1, and is also used as a rear fixing metal fitting for the solar cell modules 1 on the eaves side.

[0058] However, when general-purpose non-combustible board 45 is used as a rear fixing bracket, it is assumed that a solar cell module 1 will also be installed on the ridge side, so general-purpose non-combustible board 45 is not used as a rear fixing bracket for the last row of solar cell modules 1. As the rear fixing bracket for the last row of solar cell modules 1, rear fixing bracket 92 described in embodiment 1 is used.

[0059] Third Embodiment In the above-mentioned embodiment 1, the cable 11 and the connector 12 drawn out from the solar cell module 1 are placed and held on the fireproof non-combustible boards, eaves non-combustible board 41 and general-use non-combustible board 42. In contrast, in the present embodiment 3, the function of holding the cable 11 and the connector 12 is given to the front fixing metal fitting and the rear fixing metal fitting.

[0060] 15, the residential solar power generation system according to the third embodiment uses a front fixing bracket 94 and a rear fixing bracket 95 having the function of holding the cable 11 and the connector 12. Specifically, the front fixing bracket 94 and the rear fixing bracket 95 are provided with a holding tray (holding tray portion) 941 and a holding tray (holding tray portion) 951, respectively, on the ridge side of the portion screwed to the crosspiece 8. The cable 11 and the connector 12 are placed on and held on the holding tray 941 and the holding tray 951.

[0061] In addition, in the residential solar power generation system according to the third embodiment, a general-purpose non-combustible board 46 is used as a fire-resistant non-combustible board. The general-purpose non-combustible board 46 can be placed by hooking its front end on the rear wall of the holding tray 941 or the holding tray 951. In the third embodiment as well, rear fixing metal fittings 92 described in the first embodiment are used as rear fixing metal fittings for solar cell modules 1 in the last row.

[0062] In the residential solar power generation system according to the third embodiment, when the solar cell module 1 is of the "steel plate or the like-free type", a general-purpose noncombustible plate 46 is used, but when the solar cell module 1 is of the "steel plate or the like-attached type", the general-purpose noncombustible plate 46 can be omitted. This is because, with the "steel plate or the like-attached type" solar cell module 1, it is sufficient to prevent the spread of fire to the roof when a fire breaks out from the cable 11 or the connector 12, and this effect can be obtained only with the holding tray 941 and the holding tray 951 provided on the front fixing bracket 94 and the rear fixing bracket 95.

[0063] Furthermore, in the residential photovoltaic power generation system according to the third embodiment, it is sufficient to use only one type of fire-resistant noncombustible board, the general-use noncombustible board 46, which is advantageous in terms of cost.

[0064] Fourth embodiment In the above-mentioned first to third embodiments, the case where the roof on which the residential photovoltaic power generation system is installed is provided with crosspieces 8 has been illustrated, but the present invention is not limited to this, and the residential photovoltaic power generation system can also be installed on a roof that is not provided with crosspieces 8. An example of the configuration of the residential photovoltaic power generation system in this case is shown in the following Figs. 16 to 19.

[0065] The residential photovoltaic power generation system shown in FIG. 16 is configured using a solar cell module 1, a rear fixing bracket 96, a holding tray plate (holding tray portion) 97, and a general-purpose non-combustible plate 47. The procedure for laying this residential photovoltaic power generation system is to fasten (the rear end of) the general-purpose non-combustible plate 47, the rear fixing bracket 96, and the holding tray plate 97 together with the sheathing board 6 and the roofing 7 with wood screws or the like, and then place the next row of general-purpose non-combustible plates 47 on the ridge side. A step portion 471 is provided at the front end of the general-purpose non-combustible plate 47, and by hooking this step portion 471 onto the rear end of the holding tray plate 97, it is possible to prevent the general-purpose non-combustible plate 47 from slipping off before being fixed. Furthermore, the next row of solar cell modules 1 is installed on the next row of general-purpose non-combustible plates 47 that have been placed. By repeating these procedures, the residential photovoltaic power generation system shown in FIG. 16 can be laid.

[0066] The residential solar power generation system shown in Fig. 17 is configured using a solar cell module 1, a rear fixing bracket 98, and a general-purpose noncombustible board 47. The rear fixing bracket 98 is a member that integrates the rear fixing bracket 96 and the holding tray plate 97 shown in Fig. 16. Therefore, the installation procedure for the residential solar power generation system shown in Fig. 17 is basically the same as that for the residential solar power generation system shown in Fig. 16.

[0067] The residential solar power generation system shown in Fig. 18 is configured using a solar cell module 1 and a general-purpose non-combustible board 48. The residential solar power generation system shown in Fig. 18 is also configured using a solar cell module 1 and a general-purpose non-combustible board 49. The general-purpose non-combustible board 48 and the general-purpose non-combustible board 49 function as rear fixing brackets for the solar cell module 1 in the front row. The general-purpose non-combustible board 48 is arranged so that it comes into contact with the roofing 7 over almost its entirety, but the general-purpose non-combustible board 49 can be arranged so that the parts other than the parts that are screwed in are separated from the roofing 7.

[0068] The procedure for installing these residential solar power generation systems is to fasten general-purpose non-combustible boards 48 or 49 to the sheathing boards 6 and roofing 7 with wood screws or the like, and then install the solar cell module 1 on top of them. By repeating these procedures, the residential solar power generation system shown in Fig. 18 or Fig. 19 can be installed.

[0069] The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should be interpreted only by the above-described embodiments. The present invention is not limited to the above, but is defined based on the description of the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0070] 1. Solar cell module 11 Cable (cable member) 12 Connector (cable component) 2. Solar Panels 3 Slots 31 Front frame 32 Rear frame 41,43,44 Noncombustible board for eaves (noncombustible board for fire prevention) 42,45,46,47,48,49 General-use noncombustible board (fire prevention noncombustible board) 5 tiles 6 Field board 7. Roofing 8. Crosspiece 91,93,94 Front fixing bracket 92,95,96,98 Rear fixing bracket 97 Holding tray plate (holding tray part) 941,951 Holding tray (holding tray part)

Claims

1. A fire-resistant non-combustible board that is installed on a sloped roof, A flat panel body portion having a rectangular shape in a plan view; The panel body is provided at one end edge portion extending in the longitudinal direction thereof, and is formed with a bent engagement portion having a convex shape protruding from one surface side of the panel body so as to be engaged with a crosspiece extending in a direction perpendicular to the slope direction of the sloped roof, and having a substantially U-shaped cross section; A fire-resistant non-combustible panel characterized in that it is provided with a flat plate portion that is provided on the opposite side of the panel main body portion with respect to the bent engaging portion and is connected to another panel main body portion.

2. The fire-retardant board according to claim 1, The fire-resistant non-combustible panel is characterized in that the flat plate portion is in the shape of a flat plate parallel to the panel main body portion.

3. The fire-retardant board according to claim 1 or 2, A fire-resistant noncombustible board characterized in that it is provided with a drainage groove or drainage holes for draining water flowing over the fire-resistant noncombustible board.

4. A solar power generation system including at least one solar cell module, A fireproof non-combustible board, which is a separate member from the solar cell module and has non-combustible properties, is provided between the roofing having a predetermined gradient and the solar cell module; The fireproof noncombustible board has a bent engaging portion that engages with a crosspiece extending in a direction perpendicular to the gradient direction on the roofing, A solar power generation system characterized in that multiple fire-resistant non-combustible boards adjacent in the gradient direction are arranged so that the ridge-side edge of one fire-resistant non-combustible board is connected to the eaves-side edge of the other fire-resistant non-combustible board.

5. The solar power generation system according to claim 4, A solar power generation system characterized in that the fire-resistant non-combustible panels have flat edge portions on the eaves side and ridge side and are arranged by overlapping each other.

6. A method for installing a solar power generation system including at least one solar cell module, comprising the steps of: A first step of placing a fireproof non-combustible board, which is a separate member from the solar cell module and has non-combustible properties, on a roofing having a predetermined gradient, and engaging a bent engaging portion provided on the fireproof non-combustible board with a crosspiece extending in a direction perpendicular to the gradient direction; a second step of disposing the solar cell module on the fireproof noncombustible board that is engaged with the crosspiece, with a fixing member interposed therebetween; A method for installing a solar power generation system, characterized in that in the first step, a plurality of fire-resistant non-combustible boards adjacent to each other in the gradient direction are arranged by connecting the ridge side edge of one fire-resistant non-combustible board to the eaves side edge of the other fire-resistant non-combustible board.

7. The method for installing a solar power generation system according to claim 6, The method for installing a photovoltaic power generation system, wherein in the second step, the fixing member and the solar cell module are fastened together to the crosspiece with a fastener.

8. A pair of battens arranged at intervals on the roof substrate; A solar cell module is installed on the crosspiece; a fireproof non-combustible board disposed between the crosspiece and the solar cell module; A solar power generation system characterized in that the fire-resistant non-combustible board has an upwardly convex bent engagement portion that is placed on the crosspiece and engages with the crosspiece.

9. The solar power generation system according to claim 8, The fireproof non-combustible board includes a panel body portion extending from one lower end of the bent engaging portion in a direction opposite to the bent engaging portion and covering an upper surface of the roof base located between the adjacent battens; a flat plate portion extending from the other lower end of the bent engagement portion in a direction opposite to the bent engagement portion.

10. The solar power generation system according to claim 8 or 9, A solar power generation system characterized in that the fire-resistant noncombustible board has a drainage groove or drainage hole for draining water flowing over the fire-resistant noncombustible board.

11. A solar power generation system according to any one of claims 8 to 10, A solar power generation system characterized in that the fire-resistant non-combustible board is arranged at a distance from the roof substrate.

12. A method for installing a solar power generation system according to claim 9, The folded engaging portion of the fireproof noncombustible board is placed on the batten from above, and the upper surface of the roof foundation located between the adjacent battens is covered by the panel main body portion; A method for installing a solar power generation system, characterized in that a fixing bracket attached to the solar cell module is placed on top of the folded engagement portion, and the fixing bracket is clamped to the upper surface of the folded engagement portion and fastened to the crosspiece with screws.

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