JP7386040B2 - Vehicles and solar power generation systems - Google Patents

Description

The present invention relates to a vehicle and a solar power generation system.

In a vehicle equipped with a solar power generation system, a solar cell panel is provided on the surface of the vehicle body to generate power by converting light energy into electrical energy. The voltage of the electric power generated by the solar panel is converted by a power converter such as a DC/DC converter, and then the battery is charged.

In a solar power generation system, it is ideal for the entire surface of the solar panel to receive sunlight. However, since vehicles move through various environments, sunlight may be blocked by structures such as overpasses or pedestrian bridges, and unexpected shadows may appear on the solar panels.

For example, Patent Document 1 discloses an on-vehicle solar power generation system having a plurality of solar panels arranged in parallel in the direction of travel of a vehicle. In this solar power generation system, an operation setting that provides the maximum output point in the solar cell panel placed at the front in the direction of travel of the vehicle is used in the operation of the solar cell panel at the rear in the direction of travel of the vehicle. Thereby, the detection of the maximum output point is performed only for the solar battery panel placed at the front of the vehicle.

JP2015-229481A

When a shadow appears on the solar panel, the output power of the solar panel decreases. At this time, the output power of the solar panel may decrease, such as a decrease in the output power due to a decrease in the output voltage of the solar panel, or a decrease in the output power due to a decrease in the output current of the solar panel. There are differences in how.

Power converters that transfer power to batteries are designed to operate most efficiently when driven at a voltage at their maximum operating point. Here, the maximum operating point refers to an operating point at which the maximum output power can be obtained from the solar cell panel in a situation where no shadow is formed on the solar cell panel. Therefore, when the output voltage decreases due to the influence of shadows on the solar cell panel, there are disadvantages such as a decrease in power conversion efficiency and an inability to maintain stability of power control.

The present invention has been made in view of such problems, and an object thereof is to provide a vehicle and a solar cell panel that can suppress a decrease in power conversion efficiency and maintain stability of power control. .

A vehicle according to one aspect of the present invention includes a plurality of solar cell modules arranged on the surface of the vehicle body and arranged in a longitudinal direction of the vehicle. Each of the plurality of solar cell modules includes a plurality of solar cells electrically connected in series and arranged in a row in a direction orthogonal to the longitudinal direction of the vehicle, or a single solar cell. None of the solar cell modules among the plurality of solar cell modules is electrically connected in series with any other solar cell module.

According to the present invention, even in a situation where a shadow is formed on the solar cell panel, it is possible to reduce the drop in the output voltage of the solar cell panel. Thereby, it is possible to suppress a decrease in power conversion efficiency and maintain stability of power control.

FIG. 1 is a top view showing a vehicle according to a first embodiment. FIG. 2 is a block diagram showing the configuration of the solar power generation system. FIG. 3 is an explanatory diagram showing the relationship between the solar cell panel and a shadow that blocks the solar cell panel. FIG. 4 is an explanatory diagram illustrating changes in power generation characteristics due to shadows shown in FIG. 3. FIG. 5 is an explanatory diagram showing the relationship between the solar cell panel and a shadow that blocks the solar cell panel. FIG. 6 is an explanatory diagram illustrating changes in power generation characteristics due to shadows shown in FIG. 5. FIG. 7 is an explanatory diagram showing a modification of the solar cell panel. FIG. 8 is an explanatory diagram showing a modification of the solar cell panel. FIG. 9 is an explanatory diagram showing a modification of the solar cell panel. FIG. 10 is an explanatory diagram showing a modification of the solar cell panel. FIG. 11 is an explanatory diagram showing a modification of the solar cell panel. FIG. 12 is a top view showing a vehicle according to the second embodiment. FIG. 13 is an explanatory diagram showing a current path when a shadow occurs. FIG. 14 is a top view showing a vehicle according to the third embodiment. FIG. 15 is a block diagram showing the configuration of the solar power generation system. FIG. 16 is an explanatory diagram showing the transition of the shadow on the solar cell module. FIG. 17 is an explanatory diagram illustrating the concept of maximum operating point control.

Embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same parts are denoted by the same reference numerals and the description thereof will be omitted.

(First embodiment)
The configuration of a vehicle 200 according to this embodiment will be described with reference to FIGS. 1 and 2. This vehicle 200 is an electric vehicle driven only by an electric motor. However, vehicle 200 may be a hybrid vehicle that is driven by an engine and an electric motor, or an engine vehicle that is driven only by the engine.

In this specification, the vehicle longitudinal direction corresponds to the entire length direction of the vehicle 200, and corresponds to a direction along the forward direction or backward direction of the vehicle 200. The vehicle left-right direction corresponds to the width direction of the vehicle 200, and corresponds to a direction perpendicular to the vehicle longitudinal direction. The vehicle vertical direction corresponds to the vehicle height direction of the vehicle 200, and corresponds to a direction perpendicular to the vehicle longitudinal direction.

Vehicle 200 is equipped with a solar power generation system. A solar power generation system uses sunlight to generate electricity. The electric power generated by the solar power generation system is charged into the battery 4 mounted on the vehicle 200. The solar power generation system is mainly composed of a solar panel 1, a power converter 3, and a control device 5.

The solar panel 1 converts light energy into electrical energy and generates power. Details of the solar cell panel 1 will be described later.

Power converter 3 is connected between solar cell panel 1 and battery 4 , and transmits power between solar cell panel 1 and battery 4 . Power converter 3 converts the power generated by solar panel 1 and inputs it to battery 4 . Specifically, the power converter 3 is a DC/DC converter, and converts the output voltage of the solar cell panel 1 into the input voltage of the battery 4.

Control device 5 drives power converter 3 based on the output voltage and output current of solar panel 1 . The control device 5 controls the power converter 3 using an MPPT (Maximum Power Point Tracking) method so that the maximum output power can be obtained from the solar panel 1.

Specifically, control device 5 operates power converter 3 to change the output voltage of solar panel 1 . When the output voltage of the solar cell panel 1 is changed, the output power of the solar cell panel 1 is changed, so the control device 5 searches for the maximum operating point while changing the output voltage of the solar cell panel 1. Then, the control device 5 drives the power converter 3 to control the output voltage of the solar panel 1 so as to follow the maximum operating point.

An ammeter 6 that detects the output current of the solar panel 1 is connected to the control device 5 . Further, a voltmeter 7 that detects the output voltage of the solar cell panel 1 is connected to the control device 5 .

Next, details of the solar cell panel 1 will be explained. The solar cell panel 1 includes a plurality of solar cell modules 10. The plurality of solar cell modules 10 are arranged on the sunny surface of the roof 210 and are lined up in the longitudinal direction of the vehicle. That is, the plurality of solar cell modules 10 are arranged next to each other from the front to the rear of the vehicle 200. In the example shown in FIG. 1, four solar cell modules 10 are shown, but the number of solar cell modules 10 is not limited to four.

A power line 11 is connected to one terminal of the power converter 3, and a power line 12 is connected to the other terminal of the power converter 3. The plurality of solar cell modules 10 are electrically connected in parallel via a pair of power lines 11 and 12, respectively, and are electrically connected in parallel with the power converter 3. Specifically, one terminal of each solar cell module 10 is connected to a power line 11, and the other terminal of each solar cell module 10 is connected to a power line 12. In this way, the plurality of solar cell modules 10 constitute a parallel circuit, and any solar cell module 10 among the plurality of solar cell modules 10 is electrically connected in series with other solar cell modules 10. They have no relationship.

Each solar cell module 10 is composed of a plurality of solar cells 100. Each of the solar cells 100 is a power generation element with a function of converting light energy into electrical energy. In the example shown in FIG. 1, five solar cells 100 are shown, but the number of solar cells 100 is not limited to five.

The plurality of solar cells 100 that constitute the solar cell module 10 satisfy the following two requirements. Specifically, the plurality of solar cells 100 are electrically connected in series (first requirement). Further, the plurality of solar cells 100 are arranged in a line in the left-right direction of the vehicle (second requirement). That is, the plurality of solar cells 100 are arranged next to each other from the right side (or left side) to the left side (or right side) of vehicle 200.

Here, the direction in which the plurality of solar cells 100 are lined up includes not only a state that completely matches the left-right direction of the vehicle, but also a state that deviates from the left-right direction of the vehicle within a predetermined angular range that can be considered as the left-right direction of the vehicle. I can do it. Furthermore, the plurality of solar cells 100 arranged in the left-right direction of the vehicle do not need to be at the same position in the longitudinal direction of the vehicle, and adjacent solar cells 100 may be offset in position in the longitudinal direction of the vehicle.

Hereinafter, with reference to FIGS. 3 to 6, the relationship between the shadow generated on the solar cell panel and the power generation characteristics will be explained. The solar cell panel shown in FIGS. 3 and 5 is composed of a plurality of solar cells 300 arranged in a matrix in the horizontal and vertical directions of the paper. A plurality of solar cells 300 arranged in the left-right direction of the paper form a series circuit electrically connected in series. A plurality of series circuits made up of a plurality of solar cells 300 are lined up in the vertical direction of the paper, and these series circuits are electrically connected in parallel. That is, a solar cell panel is composed of a composite circuit in which a plurality of series circuits are connected in parallel.

In the example shown in FIG. 3, the shadow Rs is reproduced in a shape that is elongated in the vertical direction of the page, and is generated so as to cover a part of the solar cell panel. A shadow Rs occurs in each series circuit so as to break up the series connection of the solar cells 300. The solar cell 300 in which the shadow Rs exists is unable to generate electricity and has electrical resistance.

When the solar cell panel does not have a shadow Rs, the output characteristic of the composite circuit (solar cell panel), specifically, the current-voltage characteristic (IV curve) is shown by the line L1 in FIG. 4. The voltage corresponding to the maximum operating point defined on this line L1 is indicated by "V1". On the other hand, when the shadow Rs exists so as to break up the series connection of the solar cells 300, the IV curve of the composite circuit is shown by the line L2 in FIG. 4. As can be seen from FIG. 4, in the case of the shadow Rs that breaks the series connection of the solar cells 300, the output voltage decreases. Therefore, the voltage at the maximum operating point Pa also moves to the lower voltage side from "V1" to "V2".

On the other hand, in the example shown in FIG. 5, the shadow Rs is reproduced in a shape that is elongated in the left-right direction of the page, and is generated so as to cover a part of the solar cell panel. A shadow Rs is formed on the solar cell panel so as to break up the parallel connection between series circuits. The solar cell 300 in which the shadow Rs exists is unable to generate electricity and has electrical resistance.

When a shadow Rs exists to break up the parallel connection between series circuits, the IV curve of the composite circuit (solar panel) is shown by line L3 in FIG. 6. As can be seen from FIG. 6, in the case of shadow Rs that breaks the parallel connection between series circuits, the output current decreases. However, the output voltage does not change much. Therefore, the voltage at the maximum operating point Pa also remains approximately at "V1" and does not change much.

As shown in the above concept, according to the vehicle 200 and the solar power generation system according to the present embodiment, the solar cell panel 1 includes a plurality of solar cell modules arranged in the longitudinal direction of the vehicle. Each of the plurality of solar cell modules 10 includes a plurality of solar cells 100 that are electrically connected in series and lined up in a row in a direction orthogonal to the vehicle longitudinal direction. The plurality of solar cell modules 10 are electrically connected in parallel to a single power converter 3. That is, none of the solar cell modules 10 among the plurality of solar cell modules 10 is electrically connected in series with other solar cell modules 10.

The shadow of a structure such as an overpass or a pedestrian bridge is elongated in a direction orthogonal to the vehicle longitudinal direction, and moves on the solar cell panel 1 from the front to the rear of the vehicle 200 in the traveling direction. According to the configuration according to the present embodiment, none of the plurality of solar cell modules 10 lined up in the longitudinal direction of the vehicle is electrically connected in series with other solar cell modules 10. That is, the series-connected solar cells 100 are only lined up along the left-right direction of the vehicle, and are not lined up along the front-rear direction of the vehicle. Even in a situation where a shadow appears on the solar cell panel 1, the shadow on the solar cell panel 1 will break the parallel connection of the solar cell modules 10. That is, a situation in which some of the plurality of series-connected solar cells 100 are separated by shadows is suppressed.

The power converter 3 that converts the power from the solar panel 1 and inputs it to the battery 4 is designed to operate most efficiently at the voltage at the maximum operating point (operating point voltage) when the solar panel 1 is not in the shadow. has been done. Therefore, even if a shadow appears on the solar cell panel 1 and the output power decreases, it is desirable that the operating point voltage does not decrease. In this regard, according to the present embodiment, even in a situation where a shadow appears on the solar cell panel 1, there is no possibility that a part of the plurality of series-connected solar cells 100 will be separated by the shadow. suppressed. Thereby, it is possible to suppress a decrease in the output voltage, and therefore it is possible to suppress a decrease in the voltage at the maximum operating point.

In this way, the vehicle 200 and the solar cell system according to the present embodiment can suppress a decrease in the output voltage of the solar cell panel 1. As a result, it is possible to suppress a decrease in power conversion efficiency and maintain stability of power control.

Moreover, each of the solar cell modules 10 has a plurality of solar cells 100 arranged in a line in the left-right direction of the vehicle. Therefore, according to the vehicle 200 and the solar cell system according to the present embodiment, a high output voltage can be ensured in each solar cell module 10.

Note that a state in which none of the solar cell modules 10 among the plurality of solar cell modules 10 is electrically connected in series with other solar cell modules 10 typically means that the solar cell modules 10 are electrically connected to each other. Refers to the state in which the wires are not connected in series. However, the above state also includes a state in which the solar cells included in one solar cell module 10 and the solar cells included in the other solar cell module 10 are not electrically connected in series.

Hereinafter, modified examples of the solar cell panel 1 will be described with reference to FIGS. 7 to 11. In the embodiment described above, each solar cell module included in the solar cell panel 1 is composed of a plurality of solar cell modules 10. However, as shown in FIG. 7, each solar cell module included in the solar cell panel 1 may be composed of a solar cell module 10a including a single solar cell 100.

Further, in this embodiment, a plurality of solar cell modules 10 are electrically connected in parallel to a single power converter 3. However, as shown in FIG. 8, a power converter 3 may be provided for each of the plurality of solar cell modules 10, and the plurality of solar cell modules 10 may be individually connected to the plurality of power converters 3. According to this configuration, none of the solar cell modules 10 among the plurality of solar cell modules 10 is electrically connected in series with other solar cell modules 10. Therefore, even in a situation where a shadow appears on the solar cell panel 1, a situation in which a part of the plurality of series-connected solar cells 100 is separated by the shadow is suppressed. Thereby, it is possible to suppress a decrease in the output voltage, and therefore it is possible to suppress a decrease in the voltage at the maximum operating point. As a result, it is possible to suppress a decrease in power conversion efficiency and maintain stability of power control.

Moreover, according to this configuration, each of the plurality of solar cell modules 10 can be operated at the maximum operating point. Thereby, even if a shadow occurs, a decrease in output power can be further suppressed.

Moreover, the solar cell panel 1 shown in FIG. 1 includes only one module set consisting of a plurality of solar cell modules 10 arranged in the longitudinal direction of the vehicle. However, the solar cell panel 1 may include a plurality of module sets each including a plurality of solar cell 10 modules. In the example shown in FIG. 9, the solar cell panel 1 is configured such that two module sets are arranged side by side in the left-right direction of the vehicle.

Moreover, in this embodiment, the solar cell module 10 is arranged on the surface of the roof 210. However, the solar cell module 10 only needs to be provided on the surface of the vehicle body of the vehicle 200. As shown in FIG. 10, the solar cell module 10 may be provided on the surface of a hood 220. Further, as shown in FIG. 11, the solar cell module 10 may be provided on the surface of a side surface 230 of the vehicle body. In this case, each solar cell module 10 is composed of a plurality of solar cells 100 that are electrically connected in series and lined up in a row in the vertical direction of the vehicle.

In addition, the solar cell panel 1 shown in 1st Embodiment and its modification can also be applied in combination, respectively.

(Second embodiment)
A vehicle 200 according to the second embodiment will be described with reference to FIG. 12. Vehicle 200 according to the second embodiment differs from that of the first embodiment in the configuration of solar cell panel 1. Hereinafter, differences from the first embodiment will be mainly described.

A solar cell panel 1 according to the present embodiment includes a plurality of solar cell modules 10 arranged in a vehicle longitudinal direction. Each solar cell module 10 is composed of a plurality of solar cells 100 that are electrically connected in series and lined up in a row in the left-right direction of the vehicle.

Each of the solar cell modules 10 is divided by a dividing line 13 wired along the vehicle longitudinal direction so as to divide the plurality of solar cells 100 into two series circuits. In the example shown in FIG. 12, each solar cell module 10 is composed of six solar cells 100 connected in series. Each of the solar cell modules 10 is divided by a dividing line 13 into two series circuits 20 each having three solar cells 100 connected in series.

A pair of parallel circuits 25 are formed in the solar cell panel 1 from this dividing line 13 . One parallel circuit (first parallel circuit) 25 is a circuit in which each of the series circuits 20 located on the left side of the dividing line 13 is electrically connected in parallel. The other parallel circuit (second parallel circuit) 25 is a circuit in which the series circuits 20 located on the right side of the dividing line 13 are electrically connected in parallel.

The power converters 3 are electrically connected in parallel to each parallel circuit 25 . Furthermore, bypass diodes 15 are electrically connected in parallel to each parallel circuit 25 . That is, a plurality of series circuits 20 forming a parallel circuit 25 are connected in parallel to each of the power converter 3 and the bypass diode 15.

When a shadow Rs extending in the longitudinal direction of the vehicle occurs on the solar cell panel 1, the solar cell 100 located in the shadow Rs is unable to generate electricity. According to the solar cell panel 1 according to the present embodiment, current can be detoured to the bypass diode 15 side so that the solar cell 100 that is no longer able to generate electricity follows the electrical resistance. In FIG. 13, the current path is indicated by a thick line. Thereby, a decrease in the output current in the solar cell panel 1 can be suppressed. Further, in the solar cell panel 1 described in the first embodiment with reference to FIG. 9, the same effects as in this embodiment can be obtained. Note that each of the plurality of solar cell modules 10 may be divided into at least two divided circuits by one or more dividing lines. In this case, multiple parallel circuits are formed by electrically connecting each of the series circuits divided by the dividing line in parallel, and a bypass diode is electrically connected in parallel to each of the multiple parallel circuits. .

(Third embodiment)
A vehicle 200 according to a third embodiment will be described with reference to FIGS. 14 to 17. The vehicle 200 according to the third embodiment differs from that of the first embodiment in the control method of the control device 5. Hereinafter, differences from the first embodiment will be mainly described.

The solar cell panel 1 according to the present embodiment includes three solar cell modules 10 arranged at front, middle, and rear positions with respect to the forward direction of the vehicle 200. Each solar cell module 10 is composed of a plurality of solar cells 100 that are electrically connected in series and lined up in a row in a direction orthogonal to the longitudinal direction of the vehicle. Further, a power converter 3 is provided for each of the three solar cell modules 10, and the three solar cell modules 10 are individually connected to the three power converters 3. Note that the number of solar cell modules 10 and power converters 3 is not limited to three.

Normally, the control device 5 drives the power converter 3 for each of the plurality of power converters 3 and controls the output voltage of the solar cell panel 1 so as to follow the maximum operating point. That is, the control device 5 constantly searches for the maximum operating point of the solar cell module 10, which changes moment by moment while the vehicle is running. When the control device 5 searches for the maximum operating point, it takes a certain amount of time to transition from a certain operating point to the maximum operating point.

FIG. 16 shows the transition of the shadow Rs at time T1, time T2 after a certain period of time has elapsed from time T1, and time T3 after a certain period of time has elapsed from time T2. In this way, when the vehicle 200 travels, the shadow that comes from the front moves backward at a speed that corresponds to the vehicle speed. Therefore, in the present embodiment, when searching for the maximum operating point of the intermediate and rear solar cell modules 10, the control device 5 searches for the maximum operating point obtained in the front solar cell module 10 with a predetermined time delay. We will perform control to cause the transition to occur.

Specifically, a vehicle speed sensor 8 is connected to the control device 5, and the control device 5 can detect the vehicle speed of the vehicle 200 from the vehicle speed sensor 8. Furthermore, the control device 5 has position information of each solar cell module 10 on the roof 210. The control device 5 determines the distance from the front solar cell module 10 to the intermediate solar cell module 10 (intermediate module distance) and the distance from the front solar cell module 10 to the rear based on the position information of the front solar cell module 10. The distance to the solar cell module 10 (rear module distance) can be specified.

When the solar cell panel has no shadow Rs, the IV curve of the solar cell module 10 is shown by line L1 in FIG. 17. On the other hand, the IV curves of each solar cell module 10 corresponding to each time T1, T2, and T3 shown in FIG. 16 are shown by lines L11, L21, and L31 in FIG. 17, respectively.

The control device 5 constantly searches for the maximum operating point Pa1 of the solar cell module 10 in front of the solar cell module 10, and specifies the voltage at the maximum operating point Pa1.

On the other hand, for the intermediate solar cell module 10, the control device 5 determines the time required for the shadow Rs to reach the intermediate solar cell module 10 from the front solar cell module 10 based on the vehicle speed and the intermediate module distance. Calculate as delay time. Then, the control device 5 changes the voltage at the maximum operating point Pa2 of the intermediate solar cell module 10 to the voltage at the maximum operating point Pa1 with a time delay from the timing when the maximum operating point Pa1 is searched for in the front solar cell module 10. Transition based on. Similarly, for the rear solar cell module 10, the control device 5 changes the voltage at the maximum operating point Pa3 of the rear solar cell module 10 based on the voltage at the maximum operating point Pa1.

In this embodiment, the control device 5 controls the intermediate and rear solar cell modules based on the delay time and the maximum operating point Pa1 specified in the front solar cell module (first solar cell module) 10. (Second solar cell module) The power converter 3 connected to the solar cell module 10 is driven.

According to this configuration, each of the plurality of solar cell modules 10 can be operated at the maximum operating point. Thereby, even if a shadow occurs, a decrease in output power can be further suppressed.

Moreover, according to this configuration, in the intermediate and rear solar cell modules 10, by using the maximum operating point Pa1, there is no need to search for an operating point from scratch. Therefore, when the shadow approaches the intermediate and rear solar cell modules 10, the maximum operating points Pa2 and Pa3 can be quickly determined. Thereby, the middle and rear solar cell modules 10 can be operated at the maximum operating points Pa2 and Pa3 without time delay. As a result, power generation loss can be reduced.

As described above, embodiments of the present invention have been described, but the statements and drawings that form part of this disclosure should not be understood as limiting the present invention. Various alternative embodiments, implementations, and operational techniques will be apparent to those skilled in the art from this disclosure.

1 Solar panel 3 Power converter 4 Battery 5 Control device 6 Ammeter 7 Voltmeter 8 Vehicle speed sensor 10, 10a Solar cell modules 11, 12 Power line 13 Division line 15 Bypass diode 20 Series circuit 25 Parallel circuit 100 Solar cell 200 Vehicle

Claims (4)

A solar panel that converts light energy into electrical energy and generates electricity,
A battery that charges electricity,
a converter connected between the solar panel and the battery and converting voltage;
The solar panel includes:
It has a plurality of solar cell modules arranged on the surface of the vehicle body and lined up in the longitudinal direction of the vehicle,
Each of the plurality of solar cell modules includes:
It consists of a plurality of solar cells that are electrically connected in series and lined up in a line perpendicular to the longitudinal direction of the vehicle.
The plurality of solar cells are divided by a dividing line wired along the longitudinal direction of the vehicle so as to divide the plurality of solar cells into two series circuits,
The solar cell panel includes a first parallel circuit in which each of the series circuits located on the left side of the dividing line is electrically connected in parallel, and a first parallel circuit that electrically connects each of the series circuits located on the right side of the dividing line in parallel. A second parallel circuit connected in parallel is formed,
The converter and the bypass diode are electrically connected in parallel to each of the first and second parallel circuits,
A vehicle in which none of the plurality of solar cell modules is electrically connected in series with any other solar cell module. The vehicle according to claim 1 , further comprising a control device that drives, for each of the plurality of solar cell modules, the converter connected to the solar cell module based on the output voltage and output current of the solar cell module. The control device includes:
The converter connected to the first solar cell module, which is the solar cell module located furthest forward in the traveling direction of the vehicle, is driven at a first maximum operating point at which the output power of the first solar cell module is maximum. death,
Calculating the delay time based on the position of the second solar cell module, which is the solar cell module located behind the first solar cell module in the traveling direction of the vehicle, and the vehicle speed;
The vehicle according to claim 2 , wherein the converter connected to the second solar cell module is driven based on the delay time and the first maximum operating point. In solar power generation systems installed in vehicles equipped with batteries that charge electricity,
A solar panel that converts light energy into electrical energy and generates electricity,
a converter connected between the solar panel and the battery and converting voltage;
The solar panel includes:
It has a plurality of solar cell modules that are arranged in the longitudinal direction of the vehicle when placed on the surface of the vehicle,
Each of the plurality of solar cell modules includes:
It consists of a plurality of solar cells that are electrically connected in series and lined up in a line perpendicular to the longitudinal direction of the vehicle.
The plurality of solar cells are divided by a dividing line wired along the longitudinal direction of the vehicle so as to divide the plurality of solar cells into two series circuits,
The solar cell panel includes a first parallel circuit in which each of the series circuits located on the left side of the dividing line is electrically connected in parallel, and a first parallel circuit that electrically connects each of the series circuits located on the right side of the dividing line in parallel. A second parallel circuit connected in parallel is formed,
The converter and the bypass diode are electrically connected in parallel to each of the first and second parallel circuits,
A solar power generation system in which none of the plurality of solar cell modules is electrically connected in series with any other solar cell module.

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