JP2004241789A - Photovoltaic power generating system, solar cell module and method for constructing photovoltaic power generating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photovoltaic power generating system and a solar cell module which allow utilizing a roof surface effectively by simplifying a design to allocate solar cell modules on the roof surface, a wiring design and their works, to construct the system even on a small area roof surface, further for reducing the volume of a cable to simplify the connection work of a connection box. <P>SOLUTION: The output voltage is set to the above described required voltage by dividing the plurality of solar cell modules which constitute the photovoltaic power generating system into groups, using the relationship between the voltage required for the input voltage of a power conditioner and the operating voltage of single solar cell module, and connecting solar cell modules in same groups in parallel each other as well as connecting different groups in series. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a photovoltaic power generation system, a photovoltaic module, and a photovoltaic power generation system installation method that can simplify wiring work.

  2. Description of the Related Art In recent years, solar power generation systems have rapidly spread, mainly for residential use. However, the market is still dependent on subsidies by the government, and it takes 20 to 30 years to recover capital investment. Therefore, in order for the photovoltaic power generation system to spread in earnest, it is necessary to achieve economic efficiency that can compete with existing power sources. The main components of a photovoltaic power generation system are a solar cell module, a gantry, and a power conditioner. For solar cell modules, cost reductions can be expected by introducing thin-film solar cells with excellent mass productivity. It is possible to omit it by adopting the power conditioner, and the cost reduction of the power conditioner is expected by mass production. In this way, efforts to reduce the cost of equipment are beginning to bear fruit. On the other hand, the construction cost includes installation work and electrical work. With regard to the installation work, the installation work of the solar cell module is included in the installation work of the building material body by integrating the building materials, and the cost can be reduced. However, much less work has been done on electrical work. In particular, in the case of a roof material integrated type which is promising for residential use, it is preferable to lay small-area solar cell modules without gaps in order to effectively utilize a complicated roof shape.

First, with reference to FIGS. 7 and 8, a case where a 3 kW power generation system is constructed using a crystalline silicon solar cell module having an effective power generation area of 20 cm × 100 cm, a power generation output of 25 W, and an operation voltage of 10 V will be described. Will be explained.
As shown in FIG. 8, the 3 kW power generation system uses 120 solar cell modules 2 each having a capacity of 25 W. Since the input voltage of the power conditioner 8 is set to about 200 V, the output is achieved by dividing the 120 modules 2 into six groups and connecting the 20 modules 2 belonging to each group G1 to G6 in series. A voltage of 200 V is obtained. The output terminals from the six groups G1 to G6 are connected in parallel in the connection box 6, and these are integrated into a pair of output extraction cables 41 and 42, and the terminals of the output extraction cables 41 and 42 are further connected to the power conditioner 8. To the positive and negative terminals of

  In such a system, as shown in FIG. 8, since it is necessary to perform construction in units of 20 sheets per group, the layout design and wiring design of the solar cell module 2 on the roof surface 1 and the construction are complicated. The problem arises. That is, as shown by a two-dot chain line in FIG. 8, although there are spaces on the roof surface 1 where modules for another 250 W can be installed, it cannot be installed because it is necessary to configure 20 units per group. There is an inconvenience that a part 9 is generated, and no module can be installed on a small roof surface having an area where only 19 modules can be installed.

  Next, referring to FIGS. 9, 10, and 12, a case where a 3 kW system is constructed using a thin-film silicon-based solar cell module having an effective power generation area of 20 cm × 100 cm, a power generation output of 15 W, and an operation voltage of 30 V This will be described using an example.

  When a 3 kW power generation system is constructed using one 15 W module, the required number of modules is 200 in a simple calculation. However, since the voltage per sheet is 30 V, if the power conditioner input voltage is set to 210 V, it is necessary to connect seven modules in series, and the total number of modules must be a multiple of seven. Therefore, the total number of modules is 203, which is the minimum multiple of 7 which is 200 or more. The 203 sheets are divided into 29 groups, and 7 sheets per group are connected in series to obtain an output voltage of 210V.

  FIG. 9 is a wiring diagram showing the internal wiring of a conventional thin-film solar cell module. The module 2 is for connecting the positive and negative electrodes 21 and 22 to the terminals of the positive and negative cables 51 and 52, respectively. , And a terminal box 36 having terminal box wirings 30 and 31. The wiring 37 in the module on the positive electrode side and the wiring 30 in the terminal box are connected at a connection portion 39 soldered or the like, and the wiring 38 in the negative electrode side and the wiring 31 in the terminal box are connected to a connection portion 39 soldered or the like. Connected.

  As shown in FIG. 10, output terminals from the 29 groups G1 to G29 are connected in parallel in the connection box 6, these are combined into a pair of output extraction cables 41 and 42, and further, the output extraction cables 41 and 42. Is connected to the power conditioner 8. As shown in FIG. 12, each module 2 is connected to a pair of positive and negative cables 4. In such a conventional power generation system, a total of 58 cables consisting of 29 pairs of positive and negative cables are laid on the roof surface 1, these are collectively brought together at one location on the roof surface, and each cable terminal is drawn into the junction box 6. In parallel. For this reason, the volume of the lead-in cable increases, and the number of connecting portions 7 in the connection box 6 increases, so that the connection work becomes very complicated.

  The present invention solves the above-mentioned problems, and simplifies the layout design and wiring design of the solar cell modules on the roof surface, and simplifies the construction thereof, allows the roof surface to be effectively used, and enables the roof surface having a small area to be used. An object of the present invention is to provide a photovoltaic module, a photovoltaic power generation system, and a method for constructing the photovoltaic module, which can be constructed, further reduce the cable volume, and simplify the connection work in the connection box. .

  The photovoltaic power generation system according to the present invention divides a plurality of photovoltaic modules constituting the photovoltaic power generation system into groups based on the relationship between the voltage required as the power conditioner input voltage and the operating voltage of a single photovoltaic module. By connecting the solar cell modules belonging to the same group in parallel and connecting different groups in series, the output voltage is set to the required voltage.

  The solar cell module according to the present invention includes a rectangular substrate, a positive electrode provided on a surface of the rectangular substrate along one side of the rectangular substrate, and a rectangular substrate along a pair of sides opposed to one side of the rectangular substrate. A negative electrode provided on the surface, and a positive electrode connected to the positive electrode and branched into two, one of which extends to one side of the rectangular substrate and the other of which branches extends to the opposite side of the rectangular substrate A negative connection wire connected to the negative electrode and connected to the negative electrode, branched into two, one of which extends to one side of the rectangular substrate, and the other of which branches extends to the opposite side of the rectangular substrate; , Is provided.

  The method for constructing a photovoltaic power generation system according to the present invention includes the steps of: forming a plurality of photovoltaic modules constituting the photovoltaic power generation system from a relationship between a voltage required as a power conditioner input voltage and an operating voltage of a single photovoltaic module. The method is characterized in that solar cells modules belonging to the same group are connected in parallel, and different groups are connected in series to output the required voltage.

  In the present invention, the solar cell modules to be installed are grouped into groups each obtained by dividing the input voltage of the power conditioner by the voltage per solar cell module, and all the solar cell modules in each group are connected in parallel. A plurality of groups that generate the same current and voltage. The plurality of groups are connected in series to obtain a power conditioner input voltage, collect power generation output, and connect to the power conditioner. Further, the present inventors can reduce the number of groups by using the high-voltage solar cell module disclosed in the application specification and the drawings of Japanese Patent Application No. 2000-293958. As a solar cell module that realizes such a connection, a circuit including a parallel connection unit is provided inside the solar cell module in order to simplify the parallel connection operation in each group.

  Specifically, the positive electrode and the negative electrode are branched into two each by the wiring in the module and the wiring in the terminal box attached to the module, and the parallel connection can be made by connecting the positive electrode and the negative electrode of the adjacent module. I do.

  In this case, in order to take out two positive electrodes and two negative electrodes from one solar cell module, it is preferable to provide two terminal boxes provided with a pair of positive and negative output extraction cables. Preferably, a backflow prevention diode is attached to at least one of the two terminal boxes.

  Further, the pair of positive and negative output output cables led out of the terminal box may be a pair of positive and negative two-core cables integrated with each other in an insulated state.

  In addition, a pair of positive and negative connectors attached to the tip of a pair of positive and negative output extraction cables led out of the terminal box for connection with a solar cell module arranged adjacent to each other are integrated while being insulated from each other. A pair of positive and negative two-core connectors may be used.

  Further, in order to take out two positive electrodes and two negative electrodes from one solar cell module, it is preferable to provide one terminal box provided with two pairs of positive and negative output output cables. In this case, it is preferable to attach a backflow prevention diode to one terminal box.

  Further, the two pairs of positive and negative output lead-out cables led out of the terminal box may be constituted by two pairs of positive and negative two-core cables integrated in a state insulated from each other.

  Furthermore, a pair of positive and negative connectors respectively attached to the tips of two pairs of positive and negative output extraction cables led out of the terminal box for connection with the solar cell module arranged adjacently are insulated from each other. A pair of positive and negative two-core connectors may be integrated.

  In the present invention, since the wiring portions connected in parallel are provided inside the solar cell module, the layout design and wiring design of the solar cell module on the roof surface and the construction thereof are simplified, and the roof surface can be effectively utilized. Become like In particular, since the solar cell module can be installed on a roof having a small area, it greatly contributes to the spread of the solar power generation system to ordinary households. Further, according to the present invention, since the volume of the cable drawn into the indoor junction box is suppressed, the connection work in the junction box is simplified, and the number of work steps is greatly reduced.

  Hereinafter, various preferred embodiments of the present invention will be described with reference to the accompanying drawings.

(1st Embodiment)
Referring to FIGS. 1 and 2, as a photovoltaic power generation system according to a first embodiment of the present invention, a 3 kW solar cell module having an effective power generation area of 20 cm × 100 cm, a power generation output of 15 W, and an operation voltage of 30 V is used. A case where a power generation system is constructed will be described as an example.

  As shown in FIG. 1A, in the solar cell module 2 </ b> A, the positive electrode 21 is disposed closer to one short side of the rectangular substrate 20, and the negative electrode 22 is disposed closer to the other short side of the rectangular substrate 20. The first and second terminal boxes 23 and 24 are disposed between the positive and negative electrodes 21 and 22. The first terminal box 23 is provided near the positive electrode 21, and the second terminal box 24 is provided near the negative electrode 22.

  The positive electrode 21 and the negative electrode 22 are each branched into two by wirings 25, 29, 32 in the module made of copper foil or the like and wirings 27, 28, 30, 31, 33 in the terminal box.

  The first and second terminal boxes 23 and 24 are provided to lead the two branched positive and negative terminals to the outside as two pairs of positive and negative cables 51 and 52, respectively.

  At one end of the first terminal box 23, a pair of positive and negative cables 51, 52 are connected to the wirings 28, 33 in the terminal box, respectively, and similarly, one end of the second terminal box 24 extends to the opposite side. A pair of positive and negative cables 51 and 52 are connected to the wirings 30 and 31 in the terminal box, respectively. Two pairs of positive and negative cables 51 and 52 respectively extend from the main body of the module 2A by a predetermined length, and positive and negative connectors 53 and 54 are attached to the respective ends.

  By inserting the positive electrode connector 53 of the module 2A into the positive electrode connector 53 of the adjacent module 2A and inserting the negative electrode connector 54 of the module 2A into the negative electrode connector 54 of the adjacent module 2A, the modules 2A are successively connected in parallel. It has become. In this case, it is preferable to prevent the wrong insertion by changing the shape of the connector 53 for the positive electrode and the shape of the connector 54 for the negative electrode.

  The tangent portions 39 of the module wirings 25, 29, 32 and the terminal box wirings 27, 28, 30, 31, 33 are soldered or crimped.

  A backflow prevention diode 26 is provided in the first terminal box 23 to prevent a backflow current from flowing to the power generation current of the module 2A. The backflow prevention diode 26 is inserted into the first terminal box wiring 27, one is connected to the positive electrode 21 via the module wiring 25, and the other is connected to the module wiring 29 and the first terminal box wiring 28, It is connected to the positive electrode cable 51 via the two-terminal-box wiring 30.

  In the above embodiment, a pair of positive and negative cables 51 and 52 are led out of the module 2A in two directions, respectively. However, a pair of positive and negative cables 55 and 52 shown in FIG. Each of the directions may be derived. That is, the positive core wires 28b, 30b of the positive / negative two-core cable 55 are connected to the module wiring 29 as wiring in the terminal box, respectively, and the negative core wires 31b, 33b of the positive / negative double core cable 55 are used as wiring in the terminal box. Each is connected to the wiring 32b. In this case, it is preferable to prevent the wrong insertion by changing the shape of the connector 53 for the positive electrode and the shape of the connector 54 for the negative electrode.

Next, the photovoltaic power generation system of the present embodiment will be described with reference to FIG.
When the above solar cell module 2A is used for the roof surface 1 of a house, the number of modules required for constructing the 3 kW power generation system 10A is 200 in simple calculation. However, since the voltage per module is 30 V, if the power conditioner input voltage is set to 210 V, the required number of series is 7, and the total number of modules is 200 or more, which is the minimum multiple of 7 and is 203.

  The 203 solar cells are divided into seven groups, and 29 solar cell modules 2A per group are connected in parallel by connecting the positive electrodes and the negative electrodes of adjacent modules. Thus, seven groups 3a to 3g in which 29 modules 2A are connected in parallel are formed.

  One pair of positive and negative terminals at one end of each of the groups 3a to 3g are guided to the connection box 6 by extension cables 4a to 4g, and terminals of another group are connected in series in the connection box 6 so that the groups 3a to 3g are connected in series. Connected to That is, the extension cables 4a to 4g are drawn into the room from the roof surface 1 and collected in the connection box 6, and each cable terminal is connected to a terminal of an internal circuit of the connection box. Inside the connection box 6, connection portions 7a to 7n for connecting the cables 4a to 4g from the groups 3a to 3g to the output extraction cables 41 and 42 are arranged in series. Since the connection portions 7a to 7n are arranged neatly in the connection box 6 as described above, it is difficult for the connection box side and the cable side to be mistakenly connected.

  On the other hand, the connectors of the pair of positive and negative terminals at the other end of each of the groups 3a to 3g are covered with a waterproof insulating cap 59 and cured.

  A pair of positive and negative output extraction cables 41 and 42 are extracted from the output side of the connection box 6 and connected to the input side of the power conditioner 8. Further, the output side of the power conditioner 8 is connected to a home AC system or a commercial AC system.

  According to the power generation system 10A of the present embodiment, the conventional crystal-type modules need to be allocated to the roof surface in 20 groups per group, whereas the total number of modules is designed to be a multiple of seven. There is the advantage that only care has to be taken and the design and construction are simplified.

  Further, in the conventional thin film module, as shown in FIG. 10, 29 groups of 7 groups per group are connected in series, and 29 pairs of positive and negative leads and 58 cables are laid on the roof surface. In this case, since the cable volume is increased and the connection work in the connection box becomes complicated because the cables are connected in parallel at the connection box in the connection box, according to the present embodiment, seven groups are positive and negative according to the present embodiment. Seven pairs, a total of 14 extension cables may be laid, and the connection work in the connection box is also connected in series with seven pairs of positive and negative, simplifying design and construction. That is, the number of cables brought into the connection box 6 is considerably smaller than that of the related art, so that the connection work in the connection box 6 is greatly reduced.

  In this embodiment, since a part connected in parallel to the solar cell module itself is included as an internal circuit, it is preferable to incorporate a backflow prevention diode in a terminal box attached to the solar cell module.

  Further, since the solar power generation system according to the present invention does not include a series connection of solar cell modules, it is possible to use a two-core connector in which a pair of positive and negative electrodes is integrated for connection with adjacent modules. The number of man-hours can be reduced from two positive / negative to one positive / negative.

  In addition, it is preferable that the connector used for connection with the adjacent module be different in color between positive and negative or display a positive or negative sign in order to prevent incorrect insertion of positive and negative. Further, it is preferable that the positive connector and the negative connector are formed in different shapes so that an incorrect insertion between the positive and negative electrodes becomes impossible.

(Second embodiment)
Referring to FIG. 3, as a solar power generation system according to the second embodiment of the present invention, a 3 kW power generation system using a solar cell module having an effective power generation area of 20 cm × 100 cm, a power generation output of 15 W, and an operation voltage of 100 V The case of construction will be described as an example.

  As the solar cell module 2A of the present embodiment, the high voltage solar cell module disclosed by the present inventors in the application specification and drawings of Japanese Patent Application No. 2000-293958 is used. The module 2A of the present embodiment is provided with two terminal boxes for branching a positive electrode and a negative electrode into two each by wiring using a copper foil or the like in the module in the same manner as in the first embodiment, and leading out a pair of positive and negative terminals. , With a built-in parallel connection circuit.

  When such a module 2A is used for the roof surface 1 of a house, the number of modules required for constructing the 3 kW power generation system 10B is 200 in a simple calculation. When the power conditioner input voltage is 200 V, the required series number is 2 because the module operating voltage is 100 V. Therefore, all modules may be divided into even groups (= 2, 4, 6, 8,..., 2n). In this embodiment, the modules are divided into the minimum number of two groups.

  100 modules 2A per group are connected in parallel by connecting the positive electrodes and the negative electrodes of adjacent modules. In the connection part 5 of the adjacent module 2A, the positive connectors 53 are inserted and the negative connectors 54 are inserted as shown in FIG. Since the connectors 53 and 54 have a structure in which pins are inserted into a socket, for example, they can be easily connected on site. Thus, two groups 3a and 3b in which 100 modules 2A are connected in parallel are formed.

  One pair of positive and negative terminals at one end of the two groups 3a and 3b are guided to the connection box 6 by extension cables 4a, 4b, 4c and 4d, and are connected in series in the connection box 6. That is, the terminal of the positive-side cable 4a of the first group 3a is connected to the connection portion 7a, the terminal of the negative-side cable 4b is connected to the connection portion 7b, and the terminal of the positive-side cable 4c of the second group 3b is connected to the connection portion. The two groups 3a and 3b are connected in series by connecting the terminal of the negative electrode side cable 4d to the connection portion 7d to 7c. On the other hand, the connectors of the pair of positive and negative terminals at the other ends of the two groups 3a and 3b are respectively covered with a waterproof insulating cap 59 and cured.

  According to the present embodiment, in the first embodiment, the total number of modules needs to be a multiple of 7, but the total number of modules may be an even number, and the design and construction of the power generation system are further simplified. You.

  Furthermore, according to the present embodiment, in the above-described first embodiment, seven pairs of positive and negative cables were laid in seven groups, and a total of 14 extension cables had to be laid, and a serial connection of seven pairs of positive and negative cables had to be performed in the connection box. It is only necessary to lay two pairs of positive and negative extension cables in two groups, and to connect two pairs of positive and negative series in a connection box, further simplifying the design and construction.

  In addition, since this embodiment also includes a portion where the solar cell modules are connected in parallel, it is preferable to incorporate a backflow prevention diode in a terminal box attached to the solar cell module or the like.

  Further, since the solar power generation system according to the present invention does not include a series connection of solar cell modules, it is possible to use a two-core connector in which a pair of positive and negative electrodes is integrated for connection with adjacent modules. The number of man-hours can be reduced from two positive / negative to one positive / negative.

  In addition, it is preferable to change the color of the connector used for connection with the adjacent module or to display the sign of the sign in order to prevent incorrect insertion of the sign. Furthermore, it is preferable that incorrect insertion is impossible by changing the shape of the connector for the positive electrode and the shape of the connector for the negative electrode.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG.
In the solar cell modules 2A and 2B of the first and second embodiments described above, the built-in terminal box has versatility, that is, a structure in which a pair of positive and negative terminals are respectively led out of the two terminal boxes. In the module 2C of the embodiment, two terminal boxes are integrated to form one terminal box 23, and a circuit having a structure in which a total of four terminals, one pair for positive and negative, and two terminals for two positive and negative two-core cables 55 are connected. That is, in one terminal box 23, the wirings 28 and 30 in the terminal box are connected to the wiring 29c in the module connected to the positive electrode by the wiring 25 in the module and the wiring 27 in the terminal box, and the wiring inside the module connected to the negative electrode. The wirings 31 and 33 in the terminal box are connected to the wiring 32c. With such a circuit, the number of parts and the number of assembling steps can be reduced, and the number of steps for connecting to an adjacent module can be reduced from two times positive and negative to one time positive and negative. Also in the module 2C of the present embodiment, a backflow prevention diode 26 is inserted into the terminal box wiring 27 on the positive electrode side in the same manner as in the above embodiment, to prevent a backflow current from flowing to the module 2C.

  In the connection portion 5 of the adjacent module 2B, the positive and negative integrated connectors 53 and 54 are inserted as shown in FIG. Since the connectors 53 and 54 have a structure in which pins are inserted into a socket, for example, they can be easily connected on site.

  In addition, it is preferable to change the color of the connector used for connection with the adjacent module or to display the sign of the sign in order to prevent incorrect insertion of the sign. Furthermore, it is preferable that incorrect insertion is impossible by changing the shape of the connector for the positive electrode and the shape of the connector for the negative electrode.

(Fourth embodiment)
Referring to FIG. 5, as a solar power generation system according to a fourth embodiment of the present invention, a 3 kW power generation system using a solar cell module having an effective power generation area of 20 cm × 100 cm, a power generation output of 15 W, and an operation voltage of 200 V is described. The case of construction will be described as an example.

  As the solar cell module 2C of the present embodiment, the high voltage solar cell module disclosed by the present inventors in the application specification and drawings of Japanese Patent Application No. 2000-293958 is used. The module 2C of the present embodiment is the same as that of the third embodiment described above, that is, one terminal box is provided in which a positive electrode and a negative electrode are branched into two by wiring using a copper foil or the like in the module, and two pairs of positive and negative terminals are led out. In addition, it shall have a parallel connection circuit.

  When such a module 2C is used for the roof surface 1 of a house, if the required number of 3kW systems 10C is 200 and the power conditioner input voltage is 200V, series connection is not required. A total of 200 solar cell modules 2C are connected in parallel by connecting the positive electrodes and the negative electrodes of adjacent modules. One pair of positive and negative terminals at one end connected in parallel are directly connected to the power conditioner 8 by extension cables 41 and 42 without passing through a connection box. The connector of the pair of terminals at the other end is covered with a waterproof insulating cap 59 and cured.

  According to the present embodiment, the total number of modules needs to be a multiple of 7 in the first embodiment, and the total number of modules needs to be an even number in the second embodiment. It can be set arbitrarily arbitrarily, further simplifying design and construction.

  Further, in the first embodiment, it is necessary to lay out seven pairs of positive and negative extension cables in a total of seventeen groups and a total of fourteen extension cables, and to connect seven pairs of positive and negative in series in a connection box. In the second embodiment, two groups are used. It was necessary to lay two pairs of positive and negative extension cables in total, and to connect two pairs of positive and negative series in a connection box. However, according to the present embodiment, the series connection is unnecessary and the connection box can be omitted. If all the modules are connected via the connector without worrying about the number, the connection of the modules is completed, so that the workability is remarkably improved.

  Further, a pair of positive and negative connectors attached to the tip of a pair of positive and negative output extraction cables led out of the terminal box for connection with a solar cell module arranged adjacent to each other are integrated while being insulated from each other. Since a pair of positive and negative two-core connectors is used, the number of connection steps can be reduced from two positive and negative times to one positive and negative times.

  In addition, since this embodiment also includes a portion where the solar cell modules are connected in parallel, it is preferable to incorporate a backflow prevention diode in a terminal box attached to the solar cell module or the like. In addition, it is preferable to change the color of the connector used for connection with the adjacent module or to display the sign of the sign in order to prevent incorrect insertion of the sign. Furthermore, it is preferable that incorrect insertion is impossible by changing the shape of the connector for the positive electrode and the shape of the connector for the negative electrode.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 6A, the solar cell module 2 of the present embodiment has pins 56c and 56d connected to one side of the positive connector 56a and the negative connector 56b in order to prevent incorrect connection between the positive electrode wiring and the negative electrode wiring. Are provided, and sockets 57c and 57d are provided on the other positive electrode connector 57a and negative electrode connector 57b, respectively. The positive electrode pin 56c is thicker and shorter than the negative electrode pin 56d, and the positive electrode socket 57c is shallower and larger in diameter than the negative electrode socket 57d. The positive electrode pin 56c has a shape that can be inserted and connected only to the positive electrode socket 57c, and has a shape that cannot be inserted into the negative electrode socket 57d. The negative electrode pin 56d has a shape that can be inserted and connected to only the negative electrode socket 57d, and cannot be inserted into the positive electrode socket 57c.

  Similarly, in the module having the positive / negative two-core cable 55, as shown in FIG. 6 (b), a pair of positive and negative pins 56c and 56d are provided on one connector 56A, and the other connector 57A is provided. Are provided with positive and negative sockets 57c and 57d, respectively. The positive electrode pin 56c is thicker and shorter than the negative electrode pin 56d, and the positive electrode socket 57c is shallower and larger in diameter than the negative electrode socket 57d. The positive electrode pin 56c has a shape that can be inserted and connected only to the positive electrode socket 57c, and has a shape that cannot be inserted into the negative electrode socket 57d. The negative electrode pin 56d has a shape that can be inserted and connected only to the negative electrode socket 57d, and has a shape that cannot be inserted into the positive electrode socket 57c.

  According to this embodiment, since the positive pin / socket and the negative pin / socket are completely different shapes, it is possible to completely prevent an erroneous insertion connection between the positive and negative electrodes.

(A) is a wiring diagram showing internal wiring (using a single-core cable) of the solar cell module according to the embodiment of the present invention, and (b) is an internal wiring (positive / negative two-core cable) of the solar cell module according to the embodiment of the present invention. FIG. 11 is a wiring diagram showing a modified example). FIG. 1 is a block plan view showing a photovoltaic power generation system according to an embodiment of the present invention. FIG. 1 is a block plan view showing a photovoltaic power generation system according to an embodiment of the present invention. FIG. 2 is a wiring diagram showing internal wiring (using a positive and negative two-core cable) of the solar cell module according to the embodiment of the present invention. FIG. 1 is a block plan view showing a photovoltaic power generation system according to an embodiment of the present invention. (A) is a diagram illustrating a connector portion (using a single-core cable) of the solar cell module according to the embodiment of the present invention, and (b) is a connector portion (positive / negative two-core cable) of the solar cell module according to the embodiment of the present invention. FIG. FIG. 9 is a wiring diagram showing internal wiring (using a single-core cable) of a conventional solar cell module. FIG. 4 is a block plan view showing a conventional photovoltaic power generation system (using 20 crystalline solar cell modules per group). FIG. 9 is a wiring diagram showing internal wiring (using a single-core cable) of a conventional solar cell module. FIG. 9 is a block plan view showing a conventional photovoltaic power generation system (using seven thin-film solar cell modules per group). (A) is a diagram (using a single-core cable) for explaining the connection and terminal processing of the modules of the solar cell module according to the embodiment of the present invention, and (b) is a diagram illustrating the modules of the solar cell module according to the embodiment of the present invention. For explaining connection and terminal processing (modification example using positive and negative two-core cables). The figure explaining connection between modules of the conventional solar cell module, and terminal processing.

Explanation of reference numerals

2, 2A, 2B, 2C ... solar cell module,
20 ... substrate,
21 ... Positive electrode,
22 ... negative electrode,
23, 24, 36 ... terminal box,
25, 29, 32, 37, 38, 32b, 29c, 32c ... wiring in the module,
26 ... Backflow prevention diode,
39 ... connection part 27, 28, 30, 31, 33, 28b, 30b, 31b, 33b ... wiring in the terminal box,
3a to 3g, G1 to G6, G1 to G29 ... battery group,
4, 4a-4g ... extension cable,
41, 42 ... output extraction cable (extension cable),
5 ... connection part,
51 ... Positive cable,
52 ... negative electrode cable,
53, 54, 56a, 56b, 56A, 57a, 57b, 57A ... connectors,
55 ... positive / negative two-core cable
56c, 56d ... pins,
57c, 57d ... socket,
59 ... insulating cap,
6 ... junction box,
7, 7a to 7n: connecting portion (connection portion),
8 ... Power conditioner,
9 ... Part where the effective use of the roof surface is restricted,
10A, 10B, 10C ... Photovoltaic power generation system.

Claims (9)

Based on the relationship between the voltage required as the power conditioner input voltage and the operating voltage of a single solar cell module, a plurality of solar cell modules constituting the photovoltaic power generation system are divided into groups, and solar cell modules belonging to the same group are separated from each other. A photovoltaic power generation system wherein the output voltage is the required voltage by connecting in parallel and connecting different groups in series. A rectangular substrate;
A positive electrode provided on a surface of the rectangular substrate along one side of the rectangular substrate;
A negative electrode provided on the surface of the rectangular substrate along a side opposite to one side of the rectangular substrate;
A positive electrode connection wiring that is connected to the positive electrode, branches into two, and one of the branches extends to one side of the rectangular substrate, and the other branch extends to the opposite side of the rectangular substrate;
A negative connection wire that is connected to the negative electrode, branches into two, one of the branches extends to one side of the rectangular substrate, and the other branches extends to the opposite side of the rectangular substrate. Characteristic solar cell module. A part of the connection wiring for the positive electrode from the positive electrode to the branch point is a wiring provided on the module side,
The solar cell module according to claim 2, wherein a portion of the connection wiring for the negative electrode from the negative electrode to a branch point is a wiring provided on a module side. A backflow prevention diode attached to the connection wire for the positive electrode between the positive electrode and the branch point or attached to the connection wire for the negative electrode between the negative electrode and the branch point. 2. The solar cell module according to 2. A two-core wire in which the positive connection wiring and the negative connection wiring extending to one side of the rectangular substrate are combined into one, and the positive connection wiring extending to the other side of the rectangular substrate, respectively. The solar cell module according to claim 2, further comprising a two-core wire obtained by integrating the negative electrode connection wiring into one. The solar cell module according to claim 5, further comprising a connector attached to a tip of the two-core wire, wherein the positive electrode side and the negative electrode side can be connected, but the positive electrode side and the negative electrode side cannot be connected. . 2. The solar power generation system according to claim 1, wherein the solar cell module takes out two terminals from the positive electrode and the negative electrode, respectively, and enables parallel connection. The positive electrode provided on the surface of the rectangular substrate along one side of the rectangular substrate,
A negative electrode provided on the surface of the rectangular substrate along a side opposite to one side of the rectangular substrate;
A positive electrode connection wiring that is connected to the positive electrode, branches into two, and one of the branches extends to one side of the rectangular substrate, and the other branch extends to the opposite side of the rectangular substrate;
A negative connection wire that is connected to the negative electrode, branches into two, one of the branches extends to one side of the rectangular substrate, and the other branches extends to the opposite side of the rectangular substrate. The photovoltaic power generation system according to claim 1, wherein: Based on the relationship between the voltage required as the power conditioner input voltage and the operating voltage of a single solar cell module, a plurality of solar cell modules constituting the photovoltaic power generation system are divided into groups, and solar cell modules belonging to the same group are separated from each other. A method for constructing a photovoltaic power generation system, comprising connecting in parallel and connecting different groups in series to output the required voltage.

Images