JP2002076416A - Double-sided light receiving solar battery array - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery array for vertical installing of a double- sided light receiving solar battery module with less hindrance to solar radiation on light receiving surfaces of both sides. SOLUTION: In the double-sided light receiving solar battery array 8 wherein a plurality of both-sided light receiving solar battery modules 1 are so arranged that light receiving surfaces are vertical to the ground level, structure members 2, 3 in the array are arranged outside the modules 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-sided solar power generation array.

[0002]

2. Description of the Related Art A conventional general solar power generation system uses a plurality of single-sided light-receiving solar cell modules that generate electric power in proportion to solar radiation applied to the surface of a solar cell module. In addition, when a single-sided light receiving solar cell module is installed and used perpendicular to the ground surface, the solar cell module is often installed on a wall surface of a building or the like. Japanese Patent Application Laid-Open No. 9-209315 discloses a structure for supporting a solar cell module arranged on the back side of a single-sided light-receiving solar cell module when a plurality of single-sided light-receiving solar cell modules are installed perpendicular to the ground surface. A method for fixing a solar cell module to a member is shown.

[0003] Also, as for electrical connection between a plurality of solar cell modules, a plurality of solar cell strings in which a plurality of solar cell modules are connected in series are formed, and the plurality of solar cell strings are connected in parallel. A plurality of solar cell modules are electrically connected to each other by being connected to a current collection box having a, thereby forming a solar cell array.

FIGS. 15 and 16 show a conventional example. FIG. 15 is a diagram illustrating an example of a single-sided solar cell array 49 in which eight single-sided light-receiving solar cell modules 43a to 43h are installed along a wall surface 50 of a building or the like. FIG. 16 shows a cross section taken along the line AA in FIG.

[0005] Eight single-sided light receiving solar cell modules 43
In a to 43h, a portion of the frame 5 attached to the outer periphery of the solar cell module is fixed to the module fixing bracket 42 with bolts. The module fixing bracket 42 includes:
A plurality of solar cell modules are fixed to a structural member 41 installed vertically on the front surface of the wall surface 50 so as to be installed vertically on the ground surface.

In this case, the structural member 41 shown in FIG. 15 can be replaced by a method of incorporating the structural member inside the wall surface or a method of providing the structural member constituting the wall surface with a function for fixing the module fixing bracket 42. is there.

FIG. 17 is a view of the single-sided light receiving type solar cell array of FIG. The single-sided light-receiving solar cell modules 43a to 43h are fixed to a structural member 42 arranged on the back side of the solar cell module at the frame 5 portion. In addition, the solar cell string 48a includes four single-sided light-receiving type solar cell modules 43a to 43d each having a terminal box 44a to 4d arranged on the back side of the light receiving surface of the solar cell module.
47-45a-44a-4 by output cables 45a-45d and 46a-46d drawn from 4d.
6a-45b-44b-46b-45c-44c-46
In the connection order like c-45d-44d-46d-47,
It is connected to a current collection box 47 having a parallel circuit inside.

The strings connected to the current collection box as described above are connected in parallel by a parallel circuit inside the current collection box. FIG.
In the case of 7, since the solar cell array 49 is composed of two strings 48a and 48b, the two strings are connected in parallel inside the current collection box 47.

[0009]

The single-sided light-receiving type solar cell module used in the conventional example as shown in FIG. 15 has a characteristic of generating power in response to solar radiation irradiated on the front light-receiving surface. The generated power does not increase due to the solar radiation irradiated on the back side. Therefore, even if the shadow of the structural member for fixing the single-sided light receiving solar cell module is applied to the back surface side of the solar cell module, the generated power is not affected.

Therefore, a single-sided solar cell array in which a single-sided solar cell module as shown in FIG. 15 is installed has no effect on power generation even if a structural member or the like is shaded on the back side of the solar cell module. As shown in FIGS. 16 and 17, a structure is used in which a structural member 41 and a module fixing bracket 42 are arranged on the back surface side of the solar cell module.

Further, as for the output cable for connecting a plurality of single-sided light receiving modules, since the generated power does not decrease due to the shade of the cable, as shown in FIG.
Or a method of fixing to the module fixing bracket 42 or the like.

On the other hand, the double-sided light receiving module is a solar cell module having a characteristic of generating power in accordance with the total amount of solar radiation irradiated not only on the front surface but also on the front and back surfaces. For this reason, the double-sided light-receiving solar cell module uses a transparent protective material on the back surface as well as the protective material on the front surface, and has a structure that can receive sunlight from the rear surface side.

Accordingly, when a conventional single-sided solar cell array as shown in FIG. 15 is used to install a double-sided solar cell module, an output cable for connecting the modules and structural members 41 of the solar cell array are provided. , 42, the solar radiation to the light receiving surface on the back side of the double-sided light receiving solar cell module is blocked.

[0014] For this reason, the solar radiation incident on the back side of the double-sided light receiving solar cell module is reduced, so that there is a problem that power equivalent to the power generation capability of the double-sided light receiving solar cell module cannot be obtained.

When a plurality of solar cell modules are connected, the wiring distance depends on the position of the solar cell modules to be connected, such as the distance between the terminal boxes 44a and 44b and the distance between the terminal boxes 44b and 44c in FIG. May be different. In the conventional solar cell array as shown in FIG. 17, in order to reduce the on-site wiring alignment processing due to such a difference in wiring length, an output cable is provided with a margin so that it can be connected at a certain distance. In the case of more than that, the method of processing on site is adopted. Therefore, when the wiring distance is short, the remainder of the output cable is long,
There is a problem that there is a lot of wasted cable, and when the wiring distance is long, there is a problem that processing according to the wiring distance is required on site.

In the single-sided solar cell array, when the wiring distance is short, the remainder of the output cable is fixed to the frame of the solar cell module on the back side of the solar cell array. If the remainder of the output cable is similarly fixed to the frame when used, there arises a problem that the output cable hinders solar radiation incident on the double-sided photoreceptor solar cell module and reduces the generated power.

Furthermore, when the number of solar cell modules installed is large, the number of strings increases in proportion to the number of solar cell modules, so that the number of cables connected from each string to the current collection box increases, and the work of laying cables increases accordingly. There is a problem to do.

An object of the present invention is to provide a dual-sided solar cell module in which the light-receiving surface is installed perpendicular to the ground surface.
It is an object of the present invention to provide a solar cell array that does not hinder solar radiation on the light receiving surface of a double-sided light receiving solar cell module.

It is another object of the present invention to provide a double-sided light-receiving solar cell array having a structure in which the cable connecting the solar cell modules does not hinder sunlight on the light-receiving surface.

Furthermore, when the double-sided light receiving type solar cell array is composed of a plurality of strings, a cable to be wired from each string to the current collection box is omitted, and the double-sided light receiving can reduce the cable laying work. To provide a photovoltaic array.

[0021]

According to the present invention, in the design of a solar cell array, a double-sided light-receiving type solar cell module is adopted, and the light-receiving surface of the double-sided light-receiving type solar cell module is installed perpendicular to the ground surface. The structural members for fixing the plurality of double-sided solar cell modules are arranged on the outer periphery of both light-receiving surfaces on the front and back surfaces of the double-sided solar cell module.

Preferably, the structural member for fixing the double-sided light receiving solar cell module has a concave groove structure so that a frame attached to the outer peripheral portion of the double-sided light receiving solar cell module can be inserted.

In the present invention, the double-sided light receiving type solar cell modules are connected to each other by a wiring member for connecting the modules, to which a conductor is attached.

In the present invention, a double-sided photovoltaic solar cell array composed of a plurality of double-sided photoreceptor type solar cell modules is provided with a DC collector line for collecting power generated by the double-sided photoreceptor type solar cell array. Each of the strings in which the two-sided light receiving type solar cell modules are connected in series has a structure that can be connected to a DC current collector line.

[0025]

FIG. 1 shows an embodiment of a solar cell array to which the present invention is applied.

A frame 5 having a hole for fixing the double-sided solar cell module to a structural member with bolts is attached to the outer peripheral portion of the double-sided solar cell module 1. The six double-sided solar cell modules 1 include a module fixing bracket 4 for fixing, via a frame 5, a vertical side of four sides of the double-sided solar cell module 1, and a double-sided solar cell module. It is fixed by a structural member 3 that fixes the horizontal side via a frame 5. Also, the module fixing bracket 4 and the structural member 3
Is fixed to a structural member 2 in a solar cell array installed in a direction perpendicular to the ground surface. As shown in FIG. 1, the module fixing bracket 4 and the structural member 3 do not block sunlight on both front and back light receiving surfaces of the double-sided solar cell module.
Are arranged along.

FIG. 2 is a sectional view taken along the line AA in FIG. As shown in the figure, the two-sided solar cell array has a structure in which the structural member 2 is positioned in the side direction of the two-sided solar cell module 1, so that it is difficult to block sunlight on the light receiving surface of the two-sided solar cell module 1. It has become.

According to the present embodiment, when a plurality of double-sided light-receiving solar cell modules 1 are installed perpendicularly to the ground surface, the module fixing bracket 4 for fixing the double-sided light-receiving solar cell module 1 and its structure The structure in which the member 3 is located on the outer peripheral portion of the double-sided light receiving solar cell module 1 reduces the possibility of blocking sunlight incident on both the front and rear light-receiving surfaces of the double-sided light receiving solar cell module 1. Therefore, it is possible to prevent a decrease in solar radiation incident on the front and back light receiving surfaces of the double-sided light receiving solar cell module, and to obtain power generated according to power generation characteristics of the double-sided light receiving solar cell module.

FIG. 3 shows another embodiment of a double-sided light receiving solar cell array to which the present invention is applied. FIG. 3 is a diagram using a module fixing bracket 4 for fixing a vertical side of the double-sided light receiving solar cell module 1 of FIG. 1 having a concave groove structure.

FIG. 4 is a sectional view taken along line AA in FIG. As shown in FIG. 4, the module fixing bracket 4 attached to the structural member 2 has a structure having a concave groove wider than the width of the frame 5 attached to the outer periphery of the double-sided light receiving solar cell module 1. The frame 5 of the double-sided light receiving solar cell module 1 can be inserted into the groove. In addition, as shown in FIG. 3, the module fixing bracket 4 has a length that allows a plurality of double-sided light-receiving solar cell modules to be inserted, and a plurality of double-sided light-receiving solar cell modules are arranged without leaving a gap.
The horizontal structural members 3 installed between the vertically arranged two-sided light receiving solar cell modules can be omitted except for the uppermost and lowermost stages as shown in FIG.

In FIG. 3, the module fixing bracket 4 is attached to the structural member 2 so that three solar cell modules can be fixed in a direction perpendicular to the ground surface. However, as shown in FIG. If it is fixed to the structural member 2 in the horizontal direction with respect to the surface, it is also possible to adopt a structure in which the double-sided light receiving type solar cell module is inserted and fixed in the horizontal direction. In this case, if the mounting angle of the module fixing bracket is changed according to the installation conditions in addition to the horizontal and vertical directions, the double-sided light receiving solar cell module 1 can be inserted from a direction corresponding to the mounting angle of the module fixing bracket 4. It can be structured. Further, the module fixing bracket 4 of FIG. 3 can be configured to have a structure in which two L-shaped steel materials are combined like the module fixing bracket 6 of FIG. Further, as in the case of the structural member 2 in FIG. 7, there is a method in which the structural member 2 itself has a concave groove structure such as the module mounting bracket 4.

According to the present embodiment, it is possible to reduce the decrease in the power generated by the double-sided light receiving solar cell module due to the influence of the shadow of the structural members and the like in the solar cell array. Since the module fixing bracket for fixing the sides, three sides or four sides has a structure in which the frame part attached to the outer peripheral part of the double-sided light receiving solar cell module can be inserted, the solar cell module is fixed to the module fixing bracket. Can be installed simply by inserting the device, and the number of installation steps on site can be reduced.

FIG. 8 shows another embodiment of the present invention. Nine double-sided photovoltaic modules 1a to 1i are vertically arranged with respect to the ground surface by the vertical structural member 2 and the horizontal structural member 3 in the double-sided photovoltaic array 8. Wiring material storage boxes 12 a to 12 c storing module connection wiring materials for connecting a plurality of double-sided light receiving solar cell modules to each other are attached to the structural member 2.

FIG. 9 is an enlarged view of a portion indicated by a broken line in FIG.
However, FIG. 9 does not show the wiring member storage box 12a that houses the module connection wiring member 10a so that the connection state of the module connection wiring member 10a can be understood. Actually, it is necessary to make the structure such that the module connection wiring member 10a is not exposed. Therefore, as shown in FIG. 8, the module connection wiring members 10a to 10c are connected to the wiring member storage box 12a.
12c, and is invisible from the outside.

The wiring member 10a for module connection attached to the structural member 2 in the solar cell array has two conductors 13a and 13e of the same length insulated from each other on an insulating plate. As shown by a broken line in the figure, one conductor 13e is electrically disconnected by a number required to connect the double-sided light receiving solar cell modules in series. In the case of FIG. 9, since the three double-sided light receiving solar cell modules 1a to 1c are connected in series, the conductor 13e is used.
Are separated into three parts 13b, 13c and 13d.

The conductors 13a to 13d are connected to the terminal boxes 7a to 7a mounted on the double-sided light receiving solar cell modules 1a to 1c.
7c output cable 15a-
15c, and negative output cables 16a to 16c
Are connected as shown below to form the solar cell string 9a. That is, the solar cell string 9
The connection order of a is 13a-15a-7a-16a-13b
-15b-7b-16b-13c-7c-16c-13d
It is.

Also, as shown in FIG.
3d is three double-sided light receiving solar cell modules 1a to 1c
Terminal boxes 7a to 7c and output cables 15a to 15c and 16a to 16c drawn out from the terminal boxes.
Since the distances to the points connected to 3a to 13d are substantially the same, the length of the output cable can be fixed at a constant value. Therefore, the remainder of the output cable with respect to the actual wiring distance can be reduced, the waste of the cable can be reduced, and the work of adjusting the wiring length on site can be reduced.

FIG. 10 shows the electrical connection of the double-sided light receiving solar cell array 8. The symbols (+) and (-) in FIG. 9 indicate the positive and negative polarities of the output of the double-sided light receiving solar cell module.

Three double-sided light receiving solar cell modules 1a
To 1c are connected in series to form the solar cell string 9a,
d to 1f and 1g to 1i are also connected in series, respectively, and constitute solar cell strings 9b and 9c.

As shown in FIG. 9, the conductors 13a and 13d at both ends of the solar cell string 9a are connected to the lower portion of the module connecting wiring member 10a, so that the conductors at the ends of the solar cell string 9a are formed. 1
If 3a or 13d is connected to a conductor on another module connection wiring material, a plurality of strings can be connected. Therefore, the three solar cell strings 9a, 9
The solar cell string 9d formed by connecting the solar cell strings 9b and 9c in series includes a conductor 11d corresponding to a negative end of the solar cell string 9a and a conductor 13f corresponding to a positive side of the solar cell string 9b, which are connected by a cable 11a. Conductor 13 at the negative end of string 9b
It can be configured by connecting the i and the conductor 13k corresponding to the plus side of the solar cell string 9c with the cable 11b. Also, the wiring material 10c for module connection
By providing a conductor 13o that can connect the wiring at the end of the string as shown below, the conductor 13a of the module connection wiring member 10a is connected to the conductor 13a by a cable 11c, so that the positive and negative of the solar cell string 9d can be connected. Outputs at both ends can be taken out from one module connection wiring member 10c.

FIG. 11 shows an electrical connection of a solar cell string 9d in which nine double-sided light-receiving solar cell modules 1a to 1i are connected using a module connection wiring member 10a having a different conductor arrangement from that of FIG. FIG.

In FIG. 11, the double-sided light receiving solar cell modules 1a to 1f have four 13a to 13d and 13e to 1e.
3g are connected in series by two conductors on the module connecting wiring material which are separated from each other. Also in this case, the conductors 13a to 13a to 1e are arranged so that the distance from the terminal box of the six double-sided solar cell modules to the point where the output cable is connected to the conductor is substantially constant.
3g is arranged.

According to this embodiment, a plurality of solar cell modules are connected in series by connecting output cables of a plurality of double-sided light receiving solar cell modules to the module connecting wiring member attached to the structural member. Therefore, complicated wiring between the solar cell modules can be simplified. In addition, since the distance between the terminal box of the solar cell module and the conductor can be fixed at a constant value depending on the position of the conductor, the amount of output cable adjustment that takes into account the on-site alignment processing can be omitted, and the wiring length can be adjusted. Work can also be omitted. In addition, by reducing the wiring length of the output cable, it is possible to reduce the influence of the shadow on the light receiving surface due to the output cable. Furthermore, since there are few exposed cables, it is possible to provide a solar cell array excellent in design and security.

According to this embodiment, the solar cell string has a structure in which the conductors at both ends of the string in which a plurality of the double-sided light receiving type solar cell modules are connected in series are connected to the lower part of the module connection wiring member. Even if a plurality of rows extend over a plurality of rows, the solar cell strings can be connected in series only by connecting the conductors on the module connection wiring member, and the wiring operation can be simplified.

FIG. 12 is a diagram showing another embodiment in which the present invention is applied to a double-sided light receiving solar cell array.

FIG. 12 shows a plurality of double-sided light receiving solar cell modules 1a to 1j installed in a direction perpendicular to the ground surface.
And a plurality of double-sided light receiving solar cell modules 1a to 1j
The two-sided photovoltaic solar cell array 8 composed of the structural member 2 for fixing the vertical direction and the structural member 3 for fixing the horizontal direction of a plurality of two-sided photovoltaic modules 1a to 1j is provided. A DC current collector 22 for collecting the generated power extracted from the array 8;
Wiring duct 28 for accommodating the DC
It has a structure including DC connection boxes 20a to 20c housing devices for connecting two and a plurality of double-sided light receiving solar cell modules to solar cell strings 9a to 9c connected in series.

In FIG. 12, the solar cell strings 9a,
9b is the four double-sided light receiving solar cell modules 1a to 1b.
1d and 1e to 1h are connected in series. Further, DC connection boxes 20a to 20c are provided for each of the solar cell strings 9a to 9c in which a plurality of solar cell modules are connected in series, and the output cable of the solar cell string 9a is provided in the DC connection box 20a. 29a, 30a and the DC current collector 22 are drawn in.

FIG. 13 shows a structural diagram of the DC current collector 22.
The DC current collector 22 is provided on both sides of the insulating material 25 with the positive electrode 2
3 and a negative electrode 24 are attached.

FIG. 14 shows an example of the structure of the DC connection box 20a. The DC connection box 20a includes a switch 21 having a mechanical disconnection function, and a positive electrode 26 and a negative electrode 27 for connecting a current collecting line connecting the DC current collecting line 22 and a cable. Further, an arrester for surge protection and the like can be stored in the DC connection box 20a as necessary. Output cable 29 of solar cell string 9a
Reference numerals a and 30a are connected to terminals on the primary side of the switch 21, and the secondary terminals of the switch 21 and the collecting-wire connecting electrodes 26 and 27 are connected by connecting cables 31 and 32, respectively. Current collector electrodes 26 and 27 and DC current collector 2
The connection with 2 is made such that the direct current collecting line 22 is sandwiched from both sides by the collecting line connecting electrodes 26 and 27, and is fixed collectively with insulating bolts to be electrically connected.

In FIG. 12, one DC connection box is installed for each solar cell string, but two or more strings are simultaneously connected to the DC current collector line in the DC connection box depending on the installation status of the solar cell module. It is also possible to have a function of connecting.

According to this embodiment, since a plurality of solar cell modules can be connected to a direct current collecting line for each solar cell string in which a plurality of solar cell modules are connected in series, the work of laying the electric wires and electric wires from each string to the current collecting box is omitted. be able to. In addition, when the solar cell module is added, it can be added only by extending from a certain point of the DC current collector line, and the work of laying a new electric wire from the current collection box due to the additional solar cell module can be omitted. In addition, since the solar cell string is connected to the DC power line in units of strings, it can be disconnected in units of strings, so that it is possible to generate power for other strings when performing repair or repair.

[0052]

According to the present invention, the double-sided light receiving solar cell array has a structure in which the outer peripheral portion of the double-sided light receiving solar cell module is fixed. Power reduction can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of a structure of a solar cell array to which the present invention is applied.

FIG. 2 is a diagram showing a cross section of the solar cell array of FIG. 1 to which the present invention is applied.

FIG. 3 is a diagram illustrating another embodiment of the structure of the solar cell array to which the present invention is applied.

FIG. 4 is a diagram illustrating a cross section of the solar cell array of FIG. 3 to which the present invention is applied.

FIG. 5 is a diagram illustrating another embodiment of the structure of the solar cell array to which the present invention is applied.

FIG. 6 is a diagram illustrating a cross-sectional view of a solar cell array when the present invention is applied.

FIG. 7 is a diagram illustrating a solar cell array when the present invention is applied.

FIG. 8 is a diagram illustrating another embodiment of the structure of the solar cell array to which the present invention is applied.

9 is an enlarged view of a part of the solar cell array shown in FIG.

10 is a diagram illustrating electrical connection of the solar cell array illustrated in FIG.

FIG. 11 is a diagram illustrating electrical connection of a solar cell array using a module connection wiring member different from the module connection wiring member illustrated in FIG. 9;

FIG. 12 is a diagram illustrating another embodiment of the structure of the solar cell array to which the present invention is applied.

FIG. 13 is a diagram showing an example of the DC current collector 22 shown in FIG.

FIG. 14 is a diagram showing an example of the DC connection box 20a shown in FIG.

FIG. 15 is a diagram showing an example of the structure of a conventional solar cell array using a single-sided light receiving solar cell module.

16 is a diagram illustrating a cross section of the single-sided light receiving solar cell array illustrated in FIG.

FIG. 17 is a diagram showing the back surface side of the solar cell array shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Double-sided light receiving solar cell module, 2, 3, 41 ... Structural member, 4, 6 ... Module fixing bracket, 5 ... Solar cell module frame, 7, 44 ... Solar cell module terminal box, 8 ... Double-sided light receiving sun Battery array, 9, 48 ... solar cell string, 10 ... wiring material for module connection, 11
... Cable, 12 ... Wiring material storage box, 13 ... Conductor, 1
5, 16, 45, 46 ... module output cable, 1
7, 19, 29, 30, 31, 32 ... connection cable,
18, 47 ... current collection box, 20 ... DC connection box, 21 ... switch, 22 ... DC current collector, 23, 24 ... DC current collector electrode,
25: Insulating material, 26, 27 ... DC collecting wire connection electrode, 2
8 Wiring duct, 42 Module mounting bracket, 43
... Single-sided light receiving solar cell module, 49 ... Single-sided light receiving solar cell array, 50 ... Wall surface.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yoshio Eguchi 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Nuclear Power Division, Hitachi, Ltd. (72) Inventor Ichiro Araki 3-chome, Sachimachi, Hitachi-shi, Ibaraki No.1 F-term (reference) in the Nuclear Power Division of Hitachi, Ltd. 5F051 BA11 JA02 JA06 JA08 JA09 JA20

Claims (4)

[Claims] A plurality of double-sided photovoltaic modules are installed so that the light-receiving surface of the double-sided photovoltaic module is perpendicular to the ground surface. In a double-sided light receiving solar cell array to be connected, a structural member for fixing a plurality of sides of the solar cell module is arranged in a peripheral portion of the solar cell module. 2. The solar cell array according to claim 1, wherein said structural member has a concave groove structure having a width into which a frame attached to an outer peripheral portion of said double-sided light receiving solar cell module can be inserted. 3. A two-sided light-receiving solar cell module is installed such that the light-receiving surface of the two-sided light-receiving solar cell module is perpendicular to the ground surface, and the two-sided light-receiving solar cell module is mounted on the two-sided light-receiving solar cell module. An output cable for taking out the generated power of the double-sided photovoltaic module pulled out from the terminal box attached to the photovoltaic module, and a plurality of the double-sided photovoltaic modules are connected. In the dual-sided light receiving solar cell array, two conductors insulated from each other and having substantially the same length as the structural members constituting the solar cell array are integrally combined with the structural member. At least one of the terminal boxes is electrically disconnected by a number required for the number of series connection of the double-sided light receiving solar cell modules; , Bifacial solar cell array having said conductor is arranged structure such that the distance between the point where the output cable drawn from a plurality of the terminal box is connected to the conductive body is substantially the same. 4. A plurality of double-sided light-receiving solar cell modules are installed such that the light-receiving surface of the double-sided light-receiving solar cell module is perpendicular to the ground surface. In the two-sided light receiving solar cell array to be connected, a direct current collecting line for collecting power generated by the two-sided light receiving solar cell array, and a solar cell string in which a plurality of the two-sided light receiving solar cell modules are connected in series And a double-sided light receiving solar cell array having a structure capable of connecting to the DC current collector line for each of the solar cell strings.