JP2002058152A - Junction box used for installation of solar power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wiring errors such as connection errors or unconnected convectors for branch cables from a junction box and power extracting cables from a plurality of solar battery modules. SOLUTION: The junction box 4 is provided with a man cable 5, including connectors 15 for wiring and connection with the other junction box to be connected with each other. A connector 15A, which is to be connected with the connector of the main cable 5 from the other junction box 4, is embedded at the opposite side surface, while a plurality of embedded connectors 14, connected with connectors 10 of power extracting cables 23 of solar battery modules integrated to a plurality of roofing materials, are formed integrally with the other side surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay box for electrically connecting a plurality of solar cell modules, and more particularly to a relay box used for wiring connection of a roofing material integrated with a solar cell module. is there.

[0002]

2. Description of the Related Art In recent years, the use of solar cells as an environmentally friendly energy source has been improved and the cost has been reduced. Photovoltaic power generation by mounting the solar cell module on the existing roof or rooftop, integrating the solar cell module with the roofing material, and replacing the integrated member with the existing roofing material or roofing it as a new roofing material The system is becoming widespread.

However, the size of the solar cell module integrated with the roofing material is limited as a roofing material in terms of transportation or construction, and the solar cell module alone is required as a solar power generation system. It is difficult to obtain an appropriate voltage and power. For this reason, usually, a plurality of solar cell modules are electrically connected in series to obtain a desired voltage and current, and a plurality of the solar cells are electrically connected in parallel to obtain desired power.

[0004] As a member for easily performing series / parallel wiring connection of a plurality of solar cell modules as described above,
A "relay box" described in JP-A-11-310997 is known. The relay box is provided with a plurality of branch cables for connecting to a plurality of solar cell modules, and further has two trunk cables for connecting to adjacent relay boxes. A connector for connection is provided at the end of each of the trunk line and the branch line cable, and each has a structure in which a power take-out line from a solar cell module is connected to a main line cable from an adjacent relay box. Further, the above-mentioned publication also discloses a mechanism for confirming connection by lighting a light-emitting diode for notifying that the serial wiring connection of the solar cell module has been completed at the time of construction.

Here, a case of laying and constructing a roofing material on which a solar cell module is integrated by using a conventional relay box on a roof surface will be described with reference to FIGS. FIG. 5 is a schematic view showing a state in which a roofing material in which a solar cell module is integrated using a conventionally known relay box is being laid on a roof surface, FIG. 6 is a partial longitudinal sectional view of FIG. 5, and FIG. FIG. 8 is a view showing another example of a conventionally known relay box, FIG. 8 is a view showing another example of a conventionally known relay box, and FIG. 9 is a diagram schematically showing a wiring configuration in the relay box of the relay box shown in FIG. It is a wiring diagram.

Conventionally, in order to lay a roofing material on a roof base material 7 on the roof surface 1, the roofing material is laid in a certain direction in a row on the eaves side, and sequentially from the row on the eaves side. It is laid toward the row on the ridge side. Also in laying the roofing material 2 in which the solar cell module is integrated in place of the conventional roofing material, the roofing work is performed by the same construction procedure as the conventional roofing material laying as shown in FIGS. ing.

[0007] The solar cell module M is integrally attached to the recessed portion provided on the upper surface of the roof tile base material 8 in the roofing material 2 in which the solar cell module is integrated, and the solar cell module is integrated. The roofing material 2 is constituted, and the solar cell module M of the roofing material 2 in which each of the solar cell modules is integrated is provided with one two-core power lead-out cable 23. The cable 6 is connected to the connector 10.

On the other hand, as shown in FIGS. 7 and 8, the relay box 41 is of a type in which four branch cables 6 are provided on one side, and two branch cables 6 are provided on both sides. And the roofing material 2 is used depending on the laying state of the roofing material 2. Relay box 4
1 are connected to the trunk cables 5 of the relay box 41 adjacent to each other by connectors 10 provided at the respective ends thereof, and an overcharge prevention circuit or the like in a building (not shown). , And connected to the storage battery.

Reference numeral 6 denotes a branch cable extending from a relay box 41 connected to the connector 10 and a power lead-out cable 23 from the roofing material 2 in which the solar cell modules laid on the roof surface 1 are integrated. is there. The branch cable 6 and the trunk cable 5 are connected in the relay box 41 as shown in FIG. That is, the connectors 10 of all the branch cables 6 have the roof surface 1
When the connector 10 of the power lead-out cable 23 from the roofing material 2 in which the solar cell modules laid down are integrated, the solar cell modules M integrated in all the roofing materials 2 are connected in series. Are connected as follows.

Reference numeral 11 denotes a light emitting diode, reference numeral 12 denotes a resistor for protecting the light emitting diode, and reference numeral 13 denotes a backflow prevention diode. In the example shown in FIG. 9, since the light emitting diodes 11 are provided between the connection lines located at both ends where the four solar cell modules M integrated with the roofing material 2 are connected in series, the relay is performed. It is lit only when the roofing material 2 in which the four solar cell modules are integrated is securely connected to the four branch cables 6 coming out of the box 41. Lighting of the light-emitting diodes 11 confirms that the roofing material 2 in which the four solar cell modules are integrated in one relay box 41 is connected correctly and reliably in series. ing.

The box constituting the main body of the relay box 41 is made of polyphenylene ether (PP) having excellent heat resistance.
E) is molded using a resin modified with polystyrene (PS) or the like, and each fixed portion of the trunk cable 5 and the branch cable 6, the connection line portion, the light emitting diode 11,
A resistor 12 and a backflow preventing diode 13 are housed therein.

The roofing material 2 in which the solar cell module is integrated on the roof base material 7 is laid by nails 9 in a row in the row on the eaves side in a certain direction, and sequentially from the row on the eaves side to the building side. It is laid toward the upper row. And the roofing material 2 which integrated the solar cell module in this same row,
As the predetermined number is laid, these are sequentially connected to the four branch cables 6 coming out of the relay box 41, and further, the relay box 41 to which the roofing material 2 is connected in the predetermined number as described above, It is mounted on the roof base material 7 by an appropriate mounting means. In order to obtain a desired power, the trunk cables 5 coming out of the respective relay boxes 41 are connected to each other by a connector 10 and are connected to a storage battery via an overcharge prevention circuit in a building (not shown).

[0013]

However, in the case of the laying connection operation using the above-mentioned relay box 41 of the prior art, the relay box 41 and a plurality of solar cell modules are integrated together with the laying work of each roofing material 2. Since a plurality of branch cables 6 for connection are protruded from the relay box 41, such as a series connection operation for each predetermined number of the roofing material 2 and a parallel connection operation, the branch cable 6 When connecting to the roofing material 2, the work is complicated and takes a long time.

Further, this connection work is performed in the relay box 41.
, Four branch cables 6 for connecting to the roofing material 2 in which four solar cell modules are integrated together with two trunk cables 5 for connecting to the relay box 41 of the preceding and next stages. Since the connection work is a connection between the connectors 10 and 10 provided at the ends of the trunk cable 5 and the branch cable 6 for connection, these cables are entangled with each other and the connection state is checked at a glance. It is impossible to perform wiring, and there is a risk that wiring connection errors such as erroneous connection of connectors or forgetting of connection may occur.

Further, as means for confirming that the four branch cables 6 of the relay box 41 and the four power extraction cables 23 from the respective roofing materials 2 are correctly connected in series, the relay box 41 A light-emitting diode 11 is provided, and when the four power take-out cables 23 from each of the roofing materials 2 are correctly connected in series to the four branch cables 6, the light-emitting diode 11 emits light and the connection state is established. To make sure. At this time, the light emitting diode 11 embedded in the relay box together with the light emitting diode 11 is connected to the resistor 1 for protection.
2 also has a problem in that the electric current always flows through the solar cell 2, so that the electric power generated by the solar cell is always consumed and heat is generated.

Accordingly, the present invention has been made in view of the above-mentioned problem, and is directed to a relay box used for construction of a solar power generation system in which a roofing material in which a plurality of solar cell modules are integrated is electrically connected. The object of the present invention is to provide a relay box used for construction of a photovoltaic power generation system in which a connector portion for connecting a power extraction cable from a roofing material integrated with a solar cell module is integrally molded with a relay box body. It is. Further, a fuse that is blown when the relay box and a roofing material integrating a plurality of solar cell modules are correctly connected in series is provided between the connection lines in the relay box where the roofing material is connected in series. It is an object of the present invention to provide a relay box used for construction of a photovoltaic power generation system.

[0017]

In order to achieve the above object, a relay box used for construction of a photovoltaic power generation system according to claim 1 of the present invention electrically connects a plurality of solar cell modules. A relay box used for construction of a solar cell system, wherein one side of the relay box is provided with a trunk cable having a relay connector for wiring connection with another relay box to be interconnected, On the side surface, there is provided a relay connector to which a connector of a main cable from yet another relay box connected to each other is connected, and on another side surface, power extraction of a plurality of solar cell modules is provided. A plurality of buried connectors to which cables are connected are integrally formed.

In a preferred specific embodiment of the relay box used in the construction of the photovoltaic power generation system according to the present invention, the relay connector is embedded on a side surface of the relay box opposite to the surface on which the trunk cable is provided. It is characterized by having. The relay connector is provided at an end of the trunk cable extending from the relay box. Further, a plurality of buried connectors are connected in series, and among the buried connectors, a connection wire connected to a positive wire of a trunk cable of the buried connector located at both ends and a connection wire connected to a minus wire of the trunk cable. A fuse is interposed therebetween.

According to the above configuration, since the electric wires such as the branch lines do not protrude from the relay box, the construction becomes easy,
The connection can be achieved by simply inserting the power extraction cable from the solar cell module into the buried connector, thereby improving workability and eliminating erroneous connection. By embedding the relay connector, the number of electric wires extending from the relay box can be reduced, and workability can be improved. When all the solar cell modules are connected in series, the fuse blows, so that it is easy to confirm that the wiring is reliable.
In addition, a light emitting diode, a resistor, and the like for confirmation are not required, so that power generated by the solar cell is not consumed, and problems such as heat generation can be solved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a relay box according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic view showing a relay box according to a first embodiment of the present invention, FIG. 2 is an exploded development view of FIG. 1, and FIG. 3 shows a relay box according to a second embodiment of the present invention. FIG. 4 is a schematic view showing another embodiment of the relay box of the present invention.

A relay box 4 according to the first embodiment of the present invention shown in FIG. 1 has a substantially rectangular parallelepiped shape, and one of two opposing sides has another relay box at its end. A trunk cable 5 having a female connector 15 for connection with the relay box 4 is embedded on the other side surface with a male connector 15A for connection with another relay box 4. Also, four solar cell modules are integrated on one surface side of the relay box 4 sandwiched between the side surfaces on which the main cable 5 having the female connector 15 for connection and the male connector 15A for connection are provided. The four buried connectors 14 to which the female connector 10 provided at one end of the power take-out cable 23 from the roofing material 2 is connected are integrally provided.

The half-boxes 16 and 17 constituting the main body of the relay box 4 are made of polyphenylene ether (PPE) having excellent heat resistance, similarly to the conventionally known relay box 41.
Is molded using a resin modified with polystyrene (PS), etc., and accommodates a fixed portion of the trunk cable, a wiring connection portion, a buried connector 14, and the like. Although FIGS. 1 and 2 illustrate a type in which four embedded connectors 14 are provided, the number of embedded connectors 14 to be embedded can be increased or decreased according to required power. .

Each of the four buried connectors 14 is a male connector. As shown in an exploded development view shown in FIG. When the roofing material 2 in which the solar cell module is integrated is connected to each of the buried connectors 14, the four solar cell modules M are connected to each other so that the connectors 14 are connected in series. At this time, the connection lines 19 and 20 at both ends connected in series are used to send the power generated by the solar cell modules of the four roofing materials 2 to an overcharge prevention circuit in a building (not shown) or a storage battery. , Respectively. In addition,
One connection line 19 of the connection lines 19 and 20 includes:
A backflow prevention diode 13 is provided.

Next, a relay box 4 according to a second embodiment of the present invention shown in FIG. 3 has a substantially rectangular parallelepiped shape, and has four solar cell modules integrated on one side thereof. The four buried connectors 14 to which the female connector 10 provided at one end of the power take-out cable 23 from the roofing material 2 is connected are integrally provided. In addition,
Each of the embedded connectors 14 is a male connector. Then, when the power extraction cable 23 from the roofing material 2 in which the solar cell modules are integrated is connected to each of the four male buried connectors 14, a roof in which the four solar cell modules are integrated The roofing materials 2 are connected to each other inside the relay box 4 so as to be connected in series. The half box bodies 16 and 17 constituting the main body of the relay box 4 are molded using a resin or the like having excellent heat resistance, similarly to the relay box 4 described above.
The fixed portion of the main cable, the wiring connection portion, the buried connector 14 and the like are accommodated.

On the other two surfaces sandwiching the surface on which the four buried connectors 14 are provided, two trunk cables 5, 5 are provided, respectively.
At the end of the connector 5, connectors 15 and 15A are provided to be connected to the relay boxes 4 in the preceding and subsequent stages. Note that FIG.
In the example, four embedded connectors 14 are provided,
It is possible to increase or decrease the number of embedded connectors 14 according to the required power. These two trunk cables 5,
One of the connectors 15 and 15A provided in the connector 5 is a male connector, and the other is a female connector. The connection state inside the relay box 4 according to the second embodiment of the present invention shown in FIG. 3 is the same as the exploded development view of FIG.

Next, a relay box 4 according to still another embodiment of the present invention will be described with reference to FIG.
A relay box 4 according to still another embodiment of the present invention also has a substantially rectangular parallelepiped shape as in the other embodiments, and has four solar cell modules integrated on one side thereof. Four male buried connectors 14 to which the connector 10 provided at one end of the power take-out cable 23 from the roofing material 2 is connected are integrally provided. Then, a power extraction cable 23 from the roofing material 2 in which the solar cell module is integrated is connected to each of the four male buried connectors 14, and the roofing material in which the four solar cell modules M are integrated. Are connected so that they are connected in series inside the relay box 4.

On the other two surfaces sandwiching the surface on which the four buried connectors 14 are provided, two trunk cables 5, 5 are provided, respectively.
At the end of the connector 5, connectors 15 and 15A are provided to be connected to the relay boxes 4 in the preceding and subsequent stages. FIG.
In the example, four embedded connectors 14 are provided,
It is possible to increase or decrease the number of buried connectors 14 to be buried according to the required power. One of the connectors 15, 15A provided on these two trunk cables 5, 5
One is a female connector and the other is a male connector.

Of the four buried connectors 14 connected in series, a backflow preventing diode 13 is provided on a connection wire 19 connected to the positive wire 18 of the trunk cable 5 from the buried connectors 14 located at both ends. On the other hand, the embedded connector 1 located on the side opposite to the embedded connector 14
4 and the electric wire 18 on the negative side of the trunk cable 5 are connected by a connection line 20. A connection line 19 connected to the plus side electric wire 18 of the trunk cable 5 and a connection line 20 connected to the minus side electric wire 18 of the trunk cable 5
A fuse 22 is interposed and connected by a connection line 21. The fuse 22 is located inside the confirmation window 4a of the relay box 4 and can be seen through from the outside.

A fuse 22 provided between the connection line 19 and the connection line 20 connects the solar cell module to each of the four buried connectors 14 integrally molded and attached to the relay box 4. When the integrated roofing material 2 is connected, since the four solar cell modules M are connected in series, the current generated and boosted by each solar cell module M is applied to the solar cell module M-connection line. 19-fuse 22-connection line 21-connection line 20;
The fuse 22 is set to be blown by the current generated at this time. For this reason, when all the power extraction cables 23 from the roofing material 2 with the integrated solar cell module are correctly connected to the four buried connectors 14 integrally molded and attached to the relay box 4, the relay box 4, the fuse 22 provided inside the fuselage 4 is blown.
Is correctly connected. Fuse 2
2 can be easily confirmed from the confirmation window 4a of the relay box 4.

For this reason, like the conventional relay box 41, when all the power extraction cables 23 from the roofing material 2 in which the solar cell module is integrated with the relay box 41 are correctly connected, light is emitted and displayed. Since the resistor 12 for protecting the diode 11 is not used, the current generated by the solar cell that has always flowed through the resistor 12 is not consumed and the heat is not generated. The roofing material 2 in which a plurality of solar cell modules are integrated with the buried connector 14 is correctly
In addition, it can be confirmed by the blowing of the fuse 22 that the series connection is surely performed.

Similarly to the above-described relay box, the half boxes 16 and 17 constituting the main body of the relay box 4 are molded using a resin or the like having excellent heat resistance, as in the above-described relay box 4. The fixed portion of the main cable, the wiring connection portion, the fuse 22, the buried connector 14, and the like are accommodated therein. The female type and the male type of the connectors 15 and 15A of the trunk cable 5 and the connectors 10 and 14 of the power extraction cable 23 can be appropriately set, and are not limited to the above-described embodiment.

[0032]

As described above, in the relay box of the present invention, instead of the branch cable connecting to the roofing material in which the solar cell module is integrated, a connector integrated with the relay box is buried, and the buried connector is buried. Fuse that connects the power take-out cable from the roofing material to the connected connector and that blows due to the current that flows only when all the roofing materials integrating a plurality of solar cell modules are connected to the relay box Are provided in the relay box, the following effects can be obtained.

1. Since a plurality of branch cables for connecting the solar cell module to the roofing material integrated with the solar cell module are not provided from the relay box of the present invention, there is no entanglement between the cables, and the relay box and the solar cell module can be connected at a glance. This makes it easier to check the connection state with the power take-out cable from the integrated roofing material, facilitates the connection work, and shortens the connection work time that was required for a long time.

2. Cables that connect a branch cable from a relay box and a power extraction cable from a roofing material that integrates a solar cell module, like a conventional connection between a relay box and a roofing material that integrates a solar cell module. Since there is no connection work, the cable does not get in the way at the time of construction, the connection work of the cable does not become complicated, and wiring mistakes such as forgetting to connect the cable and incorrect connection can be eliminated, and workability is improved. It will be improved and the construction will be reliable.

3. Unlike the conventional junction box, there is no need to use a resistor that consumes the current generated by the connected solar cell module and generates heat inside the junction box. By providing a fuse in the relay box that is blown by a current flowing only when connected, by checking the fusing of the fuse at the time of connection work, it is possible to easily check whether the connection work has been reliably performed. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing a relay box according to a first embodiment of the present invention;

FIG. 2 is an exploded development view of FIG. 1,

FIG. 3 is a schematic view showing another embodiment of the relay box of the present invention;

FIG. 4 is a schematic diagram showing another embodiment of the relay box of the present invention;

FIG. 5 is a schematic view showing a state in which a roofing material in which a solar cell module is integrated using a conventionally known relay box is being laid on a roof surface;

6 is a partial longitudinal sectional view of FIG. 5,

FIG. 7 is a diagram showing an example of a conventionally known relay box;

FIG. 8 is a view showing another example of a conventionally known relay box;

9 is a wiring diagram schematically showing a wiring configuration inside the relay box of the relay box shown in FIG. 7;

[Explanation of symbols]

1 roof surface, 2 roofing material with integrated solar cell module, 4 relay box, 41 relay box,
4a Confirmation window 5 Main cable, 6 Branch cable, 7 Roof base material, 8 Roof tile base material, 9 Nail, 10 Connector,
Reference Signs List 11 light emitting diode, 12 resistor, 13 reverse current prevention diode, 14 buried connector, 15, 15
A relay connector, 16, 17 half box, 18 electric wire, 19, 20, 21 connection wire, 22 fuse,
23 Power extraction cable, M solar cell module

Claims (4)

[Claims] 1. A relay box used for constructing a solar cell system for electrically connecting a plurality of solar cell modules, wherein one side of the relay box is connected to another interconnecting box connected to each other. A trunk cable having a relay connector for connection is provided, and on the other side, a relay connector to which a connector of a trunk cable from another relay box to be interconnected is connected is provided. A relay box used for construction of a photovoltaic power generation system, on the other side, wherein a plurality of buried connectors to which power extraction cables of a plurality of solar cell modules are connected are integrally formed. 2. The photovoltaic power generation system according to claim 1, wherein the relay connector is embedded in a side surface of the relay box opposite to a surface on which a trunk cable is provided. Relay box. 3. The relay box according to claim 1, wherein the relay connector is provided at an end of a trunk cable extending from the relay box. . 4. A connection line for connecting the plurality of buried connectors in series, wherein the connecting wire is connected to a plus-side electric wire of a trunk cable of the buried connector located at both ends of the buried connectors.
2. A fuse is interposed between a negative electric wire of the trunk cable and a connecting wire to be connected.
A relay box used for construction of the photovoltaic power generation system according to any one of claims 1 to 3.