JP7637182B2 - Fireproof non-combustible board, solar power generation system and installation method thereof - Google Patents

Description

The present invention relates to a fireproof non-combustible board, a solar power generation system, and a method for installing the same.

A residential solar power generation system is formed by installing solar cell modules on the roof of a house using a mounting frame, installation brackets, etc. Solar cell modules that are integrated into the building material (solar cell modules are built into the roofing material) are widely used as solar cell modules for use in residential solar power generation systems (for example, Patent Documents 1 and 2). The roof of a typical house is constructed with roofing materials such as tiles or slates placed on top of 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.

Solar cell modules can be broadly classified into four types: "roof-mounted type," "installed with steel plates, etc.", "attached with steel plates, etc.", and "without steel plates, etc." Of these, the "installed with steel plates, etc.", "attached with steel plates, etc.", and "without steel plates, etc." types correspond to solar cell modules integrated into building materials.

A tile-shaped solar cell module of the "steel plate, etc. laid type" is one in which a non-flammable 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-flammable 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.

On January 28, 2019, the Consumer Safety Research Committee published an investigation report (Non-Patent Document 1). 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.

JP 2014-147286 A JP 2013-249582 A

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"

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. Solar cell modules without steel plates, etc., have the potential for fire to spread to the sheathing boards or roofing, so it is important to improve safety, as proposed in Non-Patent Document 1.

In addition, in roof tile-type solar cell modules with "steel plate or other attachment type," the cables are installed directly on the roofing. For this reason, Non-Patent Document 1 states that even in roof tile-type solar cell modules with "steel plate or other attachment type," there is a risk of the fire spreading to the roof if the cable catches fire.

The present invention was made in consideration of the above problems, and aims to provide a residential solar power generation system and an installation method thereof that can prevent the spread of fire to the roof in the event of a fire breaking out in a module or cable.

The fireproof noncombustible plate according to the first aspect of the present invention is a fireproof noncombustible plate having noncombustible properties, characterized in that it comprises a flat panel body having a rectangular shape in a plan view, a bent locking portion provided on one edge extending in the longitudinal direction of the panel body and locked to a member to be engaged, and a flat panel portion provided on the opposite side of the panel body from the bent locking portion and connected to another panel body.

The solar power generation system according to the 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 having a predetermined gradient and the solar cell module, the fire-resistant non-combustible board has a bent engagement portion that engages with a batten that is extended 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 such that the edge portion on the ridge side of one fire-resistant non-combustible board is connected to the edge portion on the eaves side of the other fire-resistant non-combustible board.

The third aspect of the present invention is a method for laying a solar power generation system including at least one solar cell module, and includes 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 roofing with a predetermined gradient, and engaging a bent engagement portion provided on the fireproof 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 fireproof non-combustible board engaged with the batten, with a fixing member interposed therebetween, and the first step is characterized in that a plurality of fireproof non-combustible boards adjacent in the gradient direction are placed by connecting the edge portion on the ridge side of one fireproof non-combustible board with the edge portion on the eaves side of the other fireproof non-combustible board.

The solar power generation system according to the fourth aspect of the present invention comprises battens arranged at intervals on the roof substrate, solar cell modules laid on the battens, and fireproof non-combustible boards arranged between the battens and the solar cell modules, and the fireproof non-combustible boards have an upwardly convex bent engagement portion that is placed on the battens and engages with the battens.

The fifth aspect of the present invention, a method for installing a solar power generation system, is the method for installing a solar power generation system described above, characterized in that the folded locking portion of the fireproof noncombustible board is placed on the battens from above, the upper surface of the roof underlayment located between the adjacent battens is covered by the panel main body, a fixing bracket attached to the solar cell module is placed on top of the folded locking portion, and the fixing bracket is secured to the battens by clamping the upper surface of the folded locking portion and tightening it together with screws.

The fireproof noncombustible board, 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 starting from the module or cable by the fireproof noncombustible board or the holding tray portion, thereby providing a residential solar power generation system with high fire resistance.

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. 2 is a cross-sectional view including the eaves side and ridge side end portions of the solar cell module of FIG. 1 . 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. 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 embodiment 1. 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. 1A and 1B are diagrams showing a rear fixing member used in the residential solar power generation system according to the first embodiment, where FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along the line AA of FIG. 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. 1A and 1B are a plan view and a cross-sectional view of a general-purpose non-combustible board used in a residential solar power generation system according to a first embodiment. 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. FIG. 11 is a plan view showing how the solar cell module and the fire-retardant board overlap. 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. 4 is a cross-sectional view illustrating a state during installation of the residential solar power generation system according to the first embodiment. FIG. FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to a second embodiment. FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to embodiment 3. FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to embodiment 4. FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to embodiment 4. FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to embodiment 4. FIG. 11 is a cross-sectional view showing a configuration example of a residential solar power generation system according to embodiment 4.

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

<Configuration of solar cell module>
First, the basic configuration of a solar cell module 1 used in the residential solar power generation system of the present invention will be described with reference to Figures 1 and 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" 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.

Figure 1 is a plan view showing the 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 that are attached to each of the four sides of the solar cell module. In the solar cell module 1, the front frame 31 attached to the eaves side and the rear frame 32 attached to the ridge side have different shapes on two opposing sides along the water flow direction of the roof.

The solar cell panel 2 is, for example, a solar cell sandwiched and sealed between a single glass plate and a protective layer (back sheet). Alternatively, it may be a solar cell sandwiched between two glass plates, each of which is formed by sequentially laminating a transparent electrode film, a photoelectric conversion layer (semiconductor layer), and a back electrode film, 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, which is a translucent substrate, and a translucent glass substrate, which is a protective plate, is attached to the back electrode layer side, and the gap between each glass substrate is sealed.

Fig. 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, aluminum material, and the shape of the cross section perpendicular to the longitudinal direction is basically the same at every point. Note that 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.

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.

A panel rear end holding portion 321 with a generally U-shaped cross section that opens 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.

The upper surface 32a of the rear frame 32 is provided with a second engagement portion 322 that is erected upward from the upper surface 32a and further bent toward the eaves side and has a generally L-shaped cross section. The lower surface 32b of the rear frame 32 is provided with a third engagement portion 323 that is erected downward from the lower surface 32b and further bent toward the eaves side and has a generally L-shaped cross section.

A reinforcing bar 33 may be provided on the back surface of the solar cell module 1 to connect and reinforce the front frame 31 and rear frame 32. 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.

Next, the structure and installation procedure of the residential solar power generation system according to the first embodiment, i.e., the roof mounting structure and installation procedure of the solar cell module 1, will be described with reference to Figures 3 to 9.

In the residential solar power generation system according to this embodiment, multiple solar cell modules 1 can be installed like tiles on a sloped roof along the water flow direction A. The solar cell modules 1 are arranged in an array not only along the water flow direction A, but also along the horizontal direction (the direction perpendicular to the water flow direction A). The solar cell modules 1 arranged in the horizontal direction in this way are also connected to each other by a frame 3, but since a well-known structure can be used for this connection structure, 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 multiple solar cell modules 1 are arranged in an array, and may be configured to include at least one solar cell module 1.

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 explanation, the solar cell module 1 installed closest to the eaves side in a residential solar power generation system will be referred to as the first row, and the second row, third row, etc. will be counted toward the ridge side.

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

In the first stage of the installation work of a residential solar power generation system, as shown in Fig. 3, a roof tile 5 is attached to the roof closest to the eaves. Specifically, the rear end of the roof tile 5 is hooked onto a batten 8 and fixed to the batten 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 upper 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 bracket 91 fastened together with the roof tile 5 forms a gap between the upper surface 5a of the roof tile 5 and the upper surface 5a of the roof tile 5 with an open eaves side, and the first engagement portion 312 of the front frame 31 is adapted to engage with this gap.

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 Figure 3. The eaves non-combustible board 41 is placed below the first row of solar cell modules 1, and is a fireproof 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 is preferably used.

Figure 4 shows a plan view and a cross-sectional view of the eaves non-combustible board 41. The front end (eaves side end) of the eaves non-combustible board 41 is provided with a bent portion 411 that stands upward and is bent toward the eaves side to have a cross section that is approximately L-shaped. The rear end (ridge side end) of the eaves non-combustible board 41 is provided with a convex portion 412 that is convex upward and has a cross section that is approximately U-shaped. Further rearward (ridge side) of the convex portion 412, a flat portion 413 is connected to it. The eaves non-combustible board 41 may also be provided with drainage grooves or drainage holes to drain rainwater, etc. that flows over the eaves non-combustible board 41.

The eaves non-combustible 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 non-combustible board 41 placed in this way 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 catches on the crosspiece 8, which prevents the eaves non-combustible board 41 from sliding down the sloped roof due to gravity during construction, improving workability.

The distance between the eaves non-combustible 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 increased compared to when the roofing 7 is in contact with the board. Furthermore, since the height of a typical batten 8 is about 15 mm, making the distance 10 mm or less makes it easier for the protrusion 412 to catch on the batten 8.

When 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.

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 A-A of (a).

The front end (eaves end) of the rear fixing bracket 92 is formed with a fourth engagement portion 921 that stands upward and is further bent toward the ridge side, and has a generally L-shaped cross section. The fourth engagement portion 921 may have multiple notches formed therein, as shown in FIG. 6(a). The rear end (ridge end) of the rear fixing bracket 92 is formed with an engagement piece 922 that stands downward. The engagement piece 922 is formed by making multiple slit-shaped cuts in the rear end of the rear fixing bracket 92 and bending the part between the cuts downward.

As a preliminary step to installing the solar cell module 1, the rear fixing bracket 92 is attached to the solar cell module 1 as shown in FIG. 5. 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.

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).

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 from the modules or cables of the solar cell modules 1. As with the eaves non-combustible board 41, the general-purpose non-combustible board 42 is not particularly limited in material as long as it is non-combustible, but steel plate or the like is preferably used.

Figure 8 shows a plan view and a cross-sectional view of the general-use non-combustible board 42. At the rear end (ridge end) of the general-use non-combustible board 42, a convex portion 421 is formed that is convex upward and has a generally U-shaped cross section. Further rearward (ridge side) of the convex portion 421, a flat plate portion 422 is formed and connected. The general-use non-combustible board 42 may also be provided with drainage grooves or drainage holes as appropriate to drain 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.

The general-purpose non-combustible board 42 is placed so that its front end (eaves side end) is placed on the flat plate portion 413 of the eaves non-combustible board 41, and the protruding portion 421 is placed on the crosspiece 8. The general-purpose non-combustible board 42 placed in this way can be installed with a certain amount of space between it and the roofing 7. Furthermore, by having the protruding portion 421 catch on the crosspiece 8, it also has the effect of preventing the general-purpose non-combustible board 42 from sliding down the sloped roof due to gravity during construction, improving workability.

The distance between the general-purpose non-combustible board 42 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 increased compared to when the board is in contact with the roofing 7. Furthermore, since the height of a typical batten 8 is about 15 mm, making the distance 10 mm or less makes it easier for the protrusion 421 to catch on the batten 8.

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 pulled out 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 pulled out from the second row of solar cell modules 1 can also be placed on the general-purpose non-combustible board 42.

In addition, even if the cable 11 and connector 12 are arranged on the underside (backside) of the solar cell module 1, the cable 11 and connector 12 are not limited to being placed on the general-purpose non-combustible board 42. For example, the cable 11 and connector 12 may be attached to the backside of the solar cell panel 2 using some kind of member, and may be arranged between the solar cell module 1 and the fire-resistant non-combustible board. Even with this configuration, the general-purpose non-combustible board 42 still exists between the cable 11 and connector 12 and the roof.

The installation method for the solar cell modules 1 in the second row is generally the same as that for the solar cell modules 1 in the first row, except 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 modules 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 tiles 5 may be installed further towards the ridge of the solar cell module 1 in the final row (the one closest to the ridge), as shown in FIG.

As described above, in the residential solar power generation system according to the first embodiment, the fireproof non-combustible boards 41 for eaves or 42 for general use are 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 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 boards (here, the general-use non-combustible boards 42) are shown with diagonal hatching. 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 area where the solar cell module 1 is arranged.

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 non-combustible board will prevent the fire from spreading to the roof, making it possible to create a residential solar power generation system with high fire resistance. Note that the cable 11 and connector 12 do not necessarily have to be placed on the fireproof non-combustible board, as long as they are placed between the solar cell module 1 and the fireproof non-combustible board. Even in this case, the same effect as above can be obtained.

In addition, 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 is prevented when a fire breaks out from the cable.

In addition, it is preferable that the eaves non-combustible board 41 and the general-use non-combustible board 42 have drainage grooves (or drainage holes) to drain water from the eaves non-combustible board 41 and the general-use non-combustible board 42, which are fire-resistant non-combustible boards, and to prevent water from accumulating on these fire-resistant non-combustible boards. In other words, the water on the fire-resistant non-combustible boards can be configured to flow along the water flow direction A and be drained from the drainage groove provided on the fire-resistant non-combustible board or from the drainage groove of another fire-resistant non-combustible board installed on the eaves side. Furthermore, since these fire-resistant non-combustible 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 non-combustible board 41 and the screw hole 423 of the general-use non-combustible 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 sheathing board 6, making these locations the weakest in terms of waterproofing, and it is preferable to locate these drainage channels as far away as possible from these screw holes.

In the above-described residential solar power generation system, a normal roof tile 5 is installed on the eaves side of the first row of solar cell modules 1, but the present invention is not limited to this. As shown in FIG. 12, the first row of solar cell modules 1 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 first row of solar cell modules 1 are installed. The installation method for the solar cell modules 1 from the second row onwards 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.

In addition, in a residential solar power generation system, it is necessary to earth each solar cell module 1. In conventional residential solar power generation systems, earth connections are made between the solar cell modules included, but in the residential solar power generation system according to the first embodiment, the fixing brackets (front fixing brackets 91, 93 and rear fixing bracket 92) and fireproof non-combustible boards (eaves non-combustible boards 41, 43 and general-use non-combustible board 42) are in contact with each other and are continuously conductive, so by using these fixing brackets and fireproof non-combustible boards as earth paths, a more reliable earth can be obtained.

When using a metal fixture or a fireproof non-combustible plate as an earth path, an earth spike (protrusion) (see Figures 4 and 8) may be provided at any point (preferably 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 electrical continuity between the components more reliable.

Second Embodiment
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-purpose 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.

As shown in FIG. 14, the residential solar power generation system according to the second embodiment uses a non-combustible board 44 for eaves that functions as a front fixing bracket, and a non-combustible board 45 for general use that functions as a rear fixing bracket.

The eaves non-combustible board 44 is used as a fireproof non-combustible board for the solar cell modules 1 in the first row, and is also used as a front fixing bracket for the solar cell modules 1 in the first row. The general-purpose non-combustible board 45 is used as a fireproof non-combustible board for the solar cell modules 1 in the second row and onwards, and is also used as a rear fixing bracket for the solar cell modules 1 on the eaves side.

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

Third Embodiment
In the above-mentioned embodiment 1, the cables 11 and connectors 12 drawn from the solar cell module 1 are placed and held on the fire-resistant non-combustible boards, eaves non-combustible board 41 and general-use non-combustible board 42. In contrast, in the present embodiment 3, the front fixing metal fitting and rear fixing metal fitting have the function of holding the cables 11 and connectors 12.

As shown in FIG. 15, the residential solar power generation system according to the third embodiment uses a front fixing bracket 94 and a rear fixing bracket 95 that have the function of holding the cable 11 and the connector 12. Specifically, the front fixing bracket 94 and the rear fixing bracket 95 each have a holding tray (holding tray portion) 941 and a holding tray (holding tray portion) 951 on the ridge side of the portion where they are 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.

In the residential solar power generation system according to the third embodiment, a general-purpose noncombustible board 46 is used as a fire-resistant noncombustible board. The general-purpose noncombustible board 46 can be placed by hooking its front end onto the rear wall of the holding tray 941 or the holding tray 951. In the third embodiment as well, the rear fixing bracket 92 described in the first embodiment is used as the rear fixing bracket of the solar cell module 1 in the last row.

In the residential solar power generation system according to the third embodiment, if the solar cell module 1 is a "steel plate-less type", a general-purpose non-combustible plate 46 is used, but if the solar cell module 1 is a "steel plate-attached type", the general-purpose non-combustible plate 46 can be omitted. This is because with a "steel plate-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 connector 12, and this effect can be obtained with only the holding tray 941 and holding tray 951 provided on the front fixing bracket 94 and rear fixing bracket 95.

In addition, in the residential solar power generation system according to the third embodiment, only one type of fireproof non-combustible board, the general-purpose non-combustible board 46, is required, which has the advantage of being cost-effective.

Fourth Embodiment
In the above 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. Configuration examples of the residential photovoltaic power generation system in this case are shown in the following Figures 16 to 19.

The residential solar power generation system shown in FIG. 16 is composed of 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 solar power generation system is to fasten the general-purpose non-combustible plate 47 (the rear end), 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, the general-purpose non-combustible plate 47 before fixing can be prevented from slipping off. 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 solar power generation system shown in FIG. 16 can be laid.

The residential solar power generation system shown in FIG. 17 is composed of a solar cell module 1, a rear fixing bracket 98, and a general-purpose non-combustible 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.

The residential solar power generation system shown in FIG. 18 is constructed 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 constructed 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 positioned so that it comes into contact with the roofing 7 over almost its entirety, but the general-purpose non-combustible board 49 can be positioned away from the roofing 7 except for the part that is screwed in.

The procedure for installing these residential solar power generation systems is to fix the general-purpose non-combustible board 48 or the general-purpose non-combustible board 49 to the sheathing board 6 and the roofing 7 with wood screws or the like, and then install the solar cell module 1 on top of it. By repeating these steps, the residential solar power generation system shown in Figure 18 or Figure 19 can be installed.

The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention is not interpreted solely by the above-described embodiments, but is defined by the claims. Also, all modifications within the scope and meaning equivalent to the claims are included.

1 Solar cell module 11 Cable (cable member)
12 Connector (cable member)
2 Solar cell panel 3 Frame 31 Front frame 32 Rear frame 41, 43, 44 Eaves non-combustible board (fireproof non-combustible board)
42, 45, 46, 47, 48, 49 General use noncombustible board (fire prevention noncombustible board)
5 Tile 6 Roof 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 (12)

A fireproof 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. 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. 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. 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. The solar power generation system according to claim 4 ,
The photovoltaic power generation system is 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. 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 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. 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. 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. 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. 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. 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. A method for installing a solar power generation system according to claim 9 ,
The folded and engaged 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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