Light guide synergistic photovoltaic power generation system and photovoltaic light guide device

Abstract

The invention provides a light guide synergistic photovoltaic power generation system and a photovoltaic light guide device. The light guide synergistic photovoltaic power generation system comprises a double-sided photovoltaic panel, and the light guide device is installed beside the double-sided photovoltaic panel; the light guide device is a light guide tube array formed by arranging and combining n light guide tubes, and is provided with a light inlet port, a light outlet port and a transparent end cover; sunlight enters the light guide pipe from the light inlet port, is reflected for multiple times, then is emitted from the light outlet port, and then reaches the back surface of the double-sided photovoltaic panel. The power generation efficiency is improved, and the cost per kilowatt-hour is reduced.

Description

Technical Field

[0001] The present application belongs to the field of new energy technologies such as photovoltaic power generation, and specifically relates to a light-guiding and efficiency-enhancing photovoltaic power generation system and a photovoltaic light-guiding device that can guide direct sunlight from the vicinity of a photovoltaic panel to the back of the photovoltaic panel through a photovoltaic light-guiding device to improve the efficiency of photovoltaic power generation. Background Art

[0002] Bifacial photovoltaic panels are specially designed photovoltaic modules with double-sided power generation capabilities. They can not only generate electricity by absorbing direct light on the front side, but also by absorbing reflected light / scattered light on the back side. There are several application solutions for using the back side of bifacial photovoltaic panels to receive reflected light / scattered light to improve power generation efficiency. First, ground reflection enhancement: set high-reflectivity ground materials such as white stones, reflective films or light-colored coatings under or around the bifacial photovoltaic panels; this design can significantly increase the amount of reflected light received on the back side, especially suitable for deserts, wastelands and areas with abundant light resources. Second, the lifting angle of the bifacial bracket: install the bifacial photovoltaic panel on a specially designed bifacial bracket, and reasonably set the inclination angle according to the geographical location and sunshine conditions, so that both the front and back sides of the photovoltaic panel can receive light more fully; for example, installing it on a bracket at a certain height can increase the receiving angle of the back side, especially suitable for areas with weak light. Third, floating installation on the water surface: floating bifacial photovoltaic panels are installed on the water surface of reservoirs, ponds, lakes, etc., and the light reflected from the water surface is used to illuminate the back side, further increasing the power generation; this method can also utilize the cooling effect of the water body to improve the working efficiency of the components and extend the service life of the photovoltaic panels. Fourth, the agricultural-photovoltaic complementary system: in agricultural areas, bifacial photovoltaic panels are hung above the farmland. The back side can not only utilize the light reflected from the surface, but also avoid the influence of shading on the growth of crops, achieving the dual-purpose effect of agriculture; this application scheme is suitable for agricultural planting and animal husbandry, especially in areas with sufficient sunlight. Fifth, building surface application: bifacial photovoltaic panels are installed on the curtain wall, roof or balcony of the building, so that the back side of the photovoltaic panel can generate electricity using the reflected light and scattered light of the building and its surrounding environment; this scheme is suitable for structures such as high-rise buildings and commercial complexes, especially in urban areas with limited space. Sixth, photovoltaic parking sheds, double-sided photovoltaic panels are installed above the parking lot, and the back side can use the light reflected by the ground and parked vehicles to increase the amount of light received on the back side; this type of solution can not only provide sunshade for the parking shed, but also charge electric vehicles or provide electricity to nearby buildings. It is a multifunctional and efficient way of utilization. Seventh, hillside and wasteland improvement design, double-sided photovoltaic panels are installed in mountainous areas or wastelands with irregular terrain. The inclination angle behind the panel is considered during the design to utilize the reflection effect of the terrain. This method can not only make full use of the land, but also make use of scattered light, which is particularly suitable for areas with strong light on slopes. These solutions improve the power generation efficiency of double-sided photovoltaic panels in different ways, making full use of reflected light and scattered light resources in the natural environment.

[0003] After investigation and testing, the applicant found that the power generation efficiency improved by the current application solutions such as the above-mentioned double-sided photovoltaic panels does not exceed 20% at most. Summary of the invention

[0004] One of the purposes of this application is to provide a light-guiding and efficient photovoltaic power generation system, which is used to guide nearby sunlight to the back of a double-sided photovoltaic panel to improve the efficiency of photovoltaic power generation and reduce the cost of electricity.

[0005] The second purpose of this application is to provide a photovoltaic light-guiding device for guiding nearby sunlight to the back of a double-sided photovoltaic panel to improve photovoltaic power generation efficiency and reduce the cost per kilowatt-hour.

[0006] In order to achieve one of the above-mentioned purposes of the invention, the present application provides a light-guiding efficiency-enhancing photovoltaic power generation system as follows.

[0007] The present application provides a light-guiding efficiency-enhancing photovoltaic power generation system, including a double-sided photovoltaic panel (as well as connecting wires, brackets, inverters, junction boxes, energy storage facilities and other components of a photovoltaic power generation system) that receives direct sunlight from the front side for power generation, characterized in that: a light-guiding device is installed next to the double-sided photovoltaic panel; the light-guiding device is composed of n light-guiding tubes arranged and combined to form a light-guiding tube array (module), having n light-inlet ports (light-guiding tubes) facing the sun and transparent end caps thereof, and having a light-outlet port (light-guiding tube) that turns toward the back of the double-sided photovoltaic panel; sunlight passes through the transparent end cap, enters the light-inlet port from the light-inlet port, and after multiple reflections and turns, is emitted from the light-outlet port (light-guiding tube), and then is emitted toward the back of the double-sided photovoltaic panel or reaches the back of the double-sided photovoltaic panel after reflection, and (ultimately) is absorbed by the back of the double-sided photovoltaic panel to generate electricity. In short, the light-guiding device is used to make the nearby sunlight go around to the back of the double-sided photovoltaic panel to increase the power generation.

[0008] Preferably, the light-guiding efficiency photovoltaic power generation system is characterized by: n≥1 or 3 or 9 or 27 or 54 or 128; and a reflective layer is attached to the inner wall of the light guide tube. The larger the n, the more uniform the light collected and output, the smaller the light loss, the less affected by different sunlight incident angles at different time periods such as morning, noon and evening, and the more conducive to efficient power generation of photovoltaic cells. n≥9 is better, and n≥27 is best.

[0009] Preferably, the light-guiding efficiency-enhancing photovoltaic power generation system is characterized in that a gradually rising reflective plate is provided in front of the light-emitting port and below the double-sided photovoltaic panel from left to right, for uniformly reflecting the (sunlight) light emitted from the light-emitting port to the back of the double-sided photovoltaic panel.

[0010] Preferably, the light-guiding efficiency-enhanced photovoltaic power generation system is characterized by: The reflector is a diffuse reflector, which is used to evenly reflect the light emitted from the light outlet port to the back of the double-sided photovoltaic panel; Alternatively, a diffuse transmission plate is provided in front of the light output port to evenly transmit the (sunlight) light emitted from the light output port to the back of the double-sided photovoltaic panel; Alternatively, the light outlet port is sealed and connected to the back of the double-sided photovoltaic panel to prevent dust from entering the light guide tube and causing a decrease in reflectivity; Alternatively, the light input port is hexagonal, and n light guides are arranged and combined into a honeycomb light guide array; Alternatively, the light input port is rectangular, and n light guides are arranged and combined into a rectangular light guide array; Alternatively, the transparent end cap of the light entrance port is connected to a bifacial photovoltaic panel; Alternatively, the light guide tube is an inflatable tube capsule, the tube wall of which has a coated reflective layer, and the light inlet port and the light outlet port have a transparent film layer; Alternatively, the diameter of the light guide tube ranges from 250 mm to 900 mm; Alternatively, the thickness of the light guide tube ranges from 10 mm to 100 mm; Alternatively, the light-guiding device and the double-sided photovoltaic panel are installed alternately.

[0011] In order to achieve the second objective of the invention, the present application provides a photovoltaic light-guiding device as follows.

[0012] The present application provides a photovoltaic light-guiding device for guiding sunlight to the back side of a double-sided photovoltaic panel, characterized in that: it is composed of n light-guiding tubes arranged and combined to form a light-guiding tube array (module), having n light-input ports (of light-guiding tubes) facing the sun and transparent end covers thereof, and having a light-output port (of light-guiding tubes) turning toward the back side of the double-sided photovoltaic panel; sunlight can pass through the transparent end cover, enter the light-guiding tube from the light-input port, and after multiple reflections and turns, be emitted from the light-output port (of light-guiding tube), and then be emitted toward the back side of the double-sided photovoltaic panel or reach the back side of the double-sided photovoltaic panel after reflection.

[0013] Preferably, the photovoltaic light guide device is characterized by: n≥1 or 3 or 9 or 27 or 54 or 128; and a reflective layer is attached to the inner wall of the light guide tube. The larger the n, the more uniform the light collected and output, the smaller the light loss, the less affected by different sunlight incident angles at different time periods such as morning, noon and evening, and the more conducive to efficient power generation of photovoltaic cells. n≥9 is better, and n≥27 is best.

[0014] Preferably, the photovoltaic light-guiding device is characterized in that a gradually rising reflective plate is provided in front of the light-emitting port and below the double-sided photovoltaic panel from left to right, for uniformly reflecting the (sunlight) light emitted from the light-emitting port to the back of the double-sided photovoltaic panel.

[0015] Preferably, the photovoltaic light guide device is characterized by: The reflector is a diffuse reflector, which is used to evenly reflect the light emitted from the light outlet port to the back of the double-sided photovoltaic panel; Alternatively, a diffuse transmission plate is provided in front of the light output port to evenly transmit the (sunlight) light emitted from the light output port to the back of the double-sided photovoltaic panel; Alternatively, the light outlet port is sealed and connected to the back of the double-sided photovoltaic panel to prevent dust from entering the light guide tube and causing a decrease in reflectivity; Alternatively, the light input port is hexagonal, and n light guides are arranged and combined into a honeycomb light guide array; Alternatively, the light input port is rectangular, and n light guides are arranged and combined into a rectangular light guide array; Alternatively, the transparent end cap of the light entrance port is connected to a bifacial photovoltaic panel; Alternatively, the light guide tube is an inflatable tube capsule, the tube wall of which has a coated reflective layer, and the light inlet port and the light outlet port have a transparent film layer; Alternatively, the diameter of the light guide tube ranges from 250 mm to 900 mm; Alternatively, the thickness of the light guide tube ranges from 10 mm to 100 mm; Alternatively, the light-guiding device and the double-sided photovoltaic panel are installed alternately.

[0016] The light guide described in this application is a commonly used optical device, which is mainly used in daylight lighting systems and can guide outdoor natural light to areas that need illumination. To ensure efficient light transmission, the inner wall of the light guide needs to be made of a material with high reflectivity. The light guide is a prior art product, and its specific technical details are not repeated here.

[0017] Compared with the prior art, the present application has the following beneficial technical effects.

[0018] First, the light-guiding device installed next to the double-sided photovoltaic panel can guide the nearby sunlight to the back of the double-sided photovoltaic panel, so as to collect and utilize the sunlight that would otherwise be wasted, thereby improving the power generation efficiency of the system. Tests have shown that the power generation efficiency of the system has been improved by 50-75%.

[0019] Second, the ratio of the 50-75% increase in electricity to the investment in the light-guiding device, that is, the investment cost of back-side power generation, is much lower than the investment cost of purchasing photovoltaic panels with the same investment for only front-side power generation, thus significantly reducing the cost of photovoltaic power generation per kilowatt-hour. For example, if you invest 200 yuan to purchase a new single-sided photovoltaic panel, you can purchase (add) 290 watts (that is, half a nominal 580-watt photovoltaic panel); while if you spend 50 yuan to purchase the inflatable tube-type light-guiding device in this application, which is used to guide nearby sunlight to the back of a nominal 580-watt double-sided photovoltaic panel, you can add 290 watts, which saves 75% of the investment cost.

[0020] Third, compared with the background technology "A high-efficiency solar cell (CN202434551U)" and other methods that use plane reflectors to increase efficiency, the light in this application is uniform, the light loss is very small, and it is not affected by different sunlight incident angles at different times such as morning, noon and evening. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the top view of the appearance effect of a (honeycomb type) photovoltaic light-guiding device used in conjunction with a double-sided photovoltaic panel in the present application (Example 1).

[0022] Figure 2 for Figure 1 Schematic diagram of the longitudinal section structure at the AB position.

[0023] Figure 3 for Figure 1 Schematic diagram of another longitudinal section structure at the AB position.

[0024] Figure 4 for Figure 1 Another schematic diagram of the longitudinal section structure at the AB position.

[0025] Figure 5 The light-guiding efficiency photovoltaic power generation system used in this application Figure 1 Schematic diagram of the effect of the photovoltaic light-guiding device and the double-sided photovoltaic panel array.

[0026] Figure 6 This is a schematic diagram of the top view of the appearance effect of a (rectangular) photovoltaic light-guiding device used in conjunction with a double-sided photovoltaic panel in the present application (Example 2).

[0027] Figure 7 for Figure 6 Schematic diagram of a longitudinal section structure at the CD position.

[0028] Figure 8 The light-guiding efficiency photovoltaic power generation system used in this application Figure 6 Schematic diagram of the effect of the photovoltaic light-guiding device and the double-sided photovoltaic panel array.

[0029] Fig. 9 The figure is a schematic diagram of the appearance effect of an inflatable light guide tube that can be combined and arranged into a photovoltaic light guide device.

[0030] Fig.10 The figure is a schematic diagram of the appearance effect of another type of inflatable light pipe that can be combined and arranged into a photovoltaic light guide device.

[0031] Fig.11 The figure is a schematic diagram of the appearance effect of another inflatable light pipe that can be combined and arranged into a photovoltaic light guide device.

[0032] Fig.12The figure is a schematic diagram of the appearance effect of another inflatable light guide tube that can be combined and arranged into a photovoltaic light guide device.

[0033] Fig.13 The light-guiding efficiency photovoltaic power generation system used in this application Figure 6 Schematic diagram of the effect of alternately installing photovoltaic light-guiding devices and double-sided photovoltaic panels.

[0034] Fig.14 for Fig.12 Schematic diagram of the effect of the light-guiding device composed of five inflatable tube balloons.

[0035] Fig.15 This is a cross-sectional schematic diagram of an upright photovoltaic light-guiding device used in conjunction with a double-sided photovoltaic panel in the present application (Example 3).

[0036] Explanation of the accompanying drawings: 1-light guide tube, 2-light guide device, 3-light input port, 4-light output port, 5-double-sided photovoltaic panel, 6-reflective plate, 7-transparent end cover, 8-inflatable tube bag, 9-diffuse transmission plate, 10-sunlight, 11-transparent film end cover. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0038] In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0039] It should be noted that the terms "installation", "connection", etc. should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Embodiment 1.

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a photovoltaic light guide device 2 is first made to guide sunlight 10 to the back of the double-sided photovoltaic panel 5. For example, n L-shaped hexagonal light guides 1 made of hard materials such as PVC, with an inner wall coating reflectivity greater than 95%, a diameter of 90 mm, can be arranged and combined into a light guide array (module), thereby making a photovoltaic light guide device 2 module. The photovoltaic light guide device 2 module needs to be provided with n light inlet ports 3 (of the light guide 1) facing the sun and transparent end caps 7 thereof (the transparent end caps 7 are used to prevent dust from entering the light guide 1 and reduce the reflectivity), and also needs to be provided with a light outlet port 4 (of the light guide 1) facing the back of the double-sided photovoltaic panel 5; so that the sunlight 10 can pass through the transparent end cap 7, enter the light guide 1 from the light inlet port 3, and after multiple reflections and turns, be emitted from the light outlet port 4 (of the light guide 1), and then be emitted to the back of the double-sided photovoltaic panel 5 or reach the back of the double-sided photovoltaic panel 5 after reflection, and (finally) be absorbed by the back of the double-sided photovoltaic panel 5 to generate electricity.

[0042] The number n of the light guide tubes 1 constituting the photovoltaic light guide device 2 is preferably ≥ 27 or 54 or 128; the inner wall of the light guide tube 1 is preferably attached with a reflective layer such as a low-cost metal coating with a reflectivity greater than 95%.

[0043] Preferably, a diffuse transmission plate 9 is provided in front of the light output port 4 to evenly distribute (i.e., evenly transmit) the sunlight 10 (light) emitted from the light output port 4 to the back of the double-sided photovoltaic panel 5. The diffuse transmission plate 9 is preferably (e.g., Figure 3 As shown) is sealed and connected to the back side of the double-sided photovoltaic panel 5 to prevent dust from contaminating the panel surface and causing its light transmittance to decrease, and to prevent dust from entering the light guide 1 and reducing the reflectivity and causing sunlight loss); or, the light input port 3 is hexagonal, and n light guides 1 are arranged and combined into a honeycomb light guide array; or, the diameter range of the light guide 1 is 250mm-900mm; or, the thickness range of the light guide 1 is 10mm-100mm.

[0044] Finally, if Figure 5 As shown, a number of photovoltaic light-guiding devices 2 and double-sided photovoltaic panels 5 are laid on the existing photovoltaic brackets, and equipped with the connecting wires, brackets, inverters, junction boxes, energy storage batteries and other components that the existing photovoltaic power generation system should have, so as to build a centralized ground photovoltaic power station.

[0045] Embodiment 2.

[0046] like Figure 6 , Figure 7 , Fig.11As shown, a photovoltaic light guide device 2 is first made to guide sunlight 10 to the back of the double-sided photovoltaic panel 5. For example, n L-shaped rectangular or wedge-shaped light guides 1 made of hard materials such as PVC, with an inner wall coating reflectivity greater than 95%, a thickness of 113.4 mm and a width of 2278 mm can be arranged and combined into a light guide array to make a photovoltaic light guide device 2 module. The photovoltaic light guide device 2 module needs to be provided with n light input ports 3 (of the light guide 1) facing the sun and transparent end caps 7 thereof, and also needs to be provided with a light output port 4 (of the light guide 1) facing the back of the double-sided photovoltaic panel 5; so that the sunlight 10 can pass through the transparent end cap 7, enter the light guide 1 from the light input port 3, and after multiple reflections and turns, be emitted from the light output port 4 (of the light guide 1), and then be emitted to the back of the double-sided photovoltaic panel 5 or reach the back of the double-sided photovoltaic panel 5 after reflection, and (finally) be absorbed by the back of the double-sided photovoltaic panel 5 to generate electricity.

[0047] The number n of the light guide tubes 1 constituting the photovoltaic light guide device 2 is preferably 10; the inner wall of the light guide tube 1 is preferably attached with a reflective layer such as a low-cost metal coating with a reflectivity greater than 95%.

[0048] Preferably, a gradually rising reflector 6 is provided in front of the light output port 3 and below the double-sided photovoltaic panel 5 from left to right, for uniformly distributing (i.e., uniformly reflecting) the sunlight 10 (light) emitted from the light output port 4 to the back side of the double-sided photovoltaic panel 5.

[0049] Preferably, the reflector 6 is a diffuse reflector.

[0050] Most preferably, Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.14 As shown, a vertically bent inflatable tube 8 is used as the light guide 1, the inner side of the tube wall of which has a coated reflective layer, and the light inlet port 3 and the light outlet port 4 have transparent film end caps 11. The photovoltaic light guide device 2 formed by combining the inflatable tube 8 type light guide 1 is light and durable, economical and affordable, and easy to transport and install. It can be transported without inflation, and can be re-inflated during installation and construction. It can be tied to the double-sided photovoltaic panel 5 with several thin ropes at several corners like fixing a balloon.

[0051] Finally, if Figure 8 As shown, by laying a large number of photovoltaic light guide devices 2 and double-sided photovoltaic panels 5 on the existing photovoltaic bracket, and configuring the connecting wires, inverters, junction boxes, energy storage facilities and other components that the current photovoltaic power generation system should have, a centralized ground photovoltaic power station can be built. Fig.13 As shown, the light guide device 2 and the double-sided photovoltaic panel 5 are installed alternately to reduce the usage of the double-sided photovoltaic panel 5 and reduce the system cost.

[0052] Embodiment three.

[0053] like Fig.15 As shown, referring to the above two examples, a relatively thin photovoltaic light guide device 2 is made and erected on the side of the double-sided photovoltaic panel 5 to guide the sunlight 10 on the side to the back of the double-sided photovoltaic panel 5. In this way, the sunlight 10 on the side can penetrate the transparent end cover 7 into the light guide 1, and after multiple reflections and turns, it can be emitted from the light outlet port 4 (of the light guide 1) to the back of the double-sided photovoltaic panel 5.

[0054] What is disclosed above is only a preferred embodiment of the present application. The drawings are merely schematic structural diagrams and are not drawn according to the actual size ratio. They cannot be used to limit the scope of rights of the present application. Equivalent changes made based on the claims of the present application still fall within the scope covered by the present application.

Claims

1. A light-guiding efficiency photovoltaic power generation system, comprising a double-sided photovoltaic panel for receiving direct sunlight for power generation, characterized in that: A light-guiding device is installed next to the double-sided photovoltaic panel; the light-guiding device is composed of n light-guiding tubes arranged and combined to form a light-guiding tube array, with n light-inlet ports facing the sun and transparent end covers thereof, and with a light-outlet port turned toward the back of the double-sided photovoltaic panel; sunlight passes through the transparent end cover, enters the light-guiding tube from the light-inlet port, is reflected and turned multiple times, and then is emitted from the light-outlet port, and then is emitted toward the back of the double-sided photovoltaic panel or reaches the back of the double-sided photovoltaic panel after reflection, and is absorbed by the back of the double-sided photovoltaic panel to generate electricity.

2. The light-guiding and efficient photovoltaic power generation system according to claim 1, characterized in that: n≥1 or 3 or 9 or 27 or 54 or 128; a reflective layer is provided on the inner wall of the light guide tube.

3. The light-guiding efficiency-enhanced photovoltaic power generation system according to claim 2, characterized in that: In front of the light output port, below the double-sided photovoltaic panel, and from left to right, there are gradually rising reflective plates for evenly reflecting the light emitted from the light output port to the back of the double-sided photovoltaic panel.

4. The light-guiding and efficient photovoltaic power generation system according to claim 3, characterized in that: The reflector is a diffuse reflector, which is used to evenly reflect the light emitted from the light outlet port to the back of the double-sided photovoltaic panel; Alternatively, a diffuse transmission plate is provided in front of the light output port to evenly transmit the light emitted from the light output port to the back of the double-sided photovoltaic panel; Alternatively, the light outlet port is sealed and connected to the back of the double-sided photovoltaic panel; Alternatively, the light input port is hexagonal, and n light guides are arranged and combined into a honeycomb light guide array; Alternatively, the light input port is rectangular, and n light guides are arranged and combined into a rectangular light guide array; Alternatively, the transparent end cap of the light entrance port is connected to a bifacial photovoltaic panel; Alternatively, the light guide tube is an inflatable tube capsule, the tube wall of which has a coated reflective layer, and the light inlet port and the light outlet port have a transparent film layer; Alternatively, the diameter of the light guide tube ranges from 250 mm to 900 mm; Alternatively, the thickness of the light guide tube ranges from 10 mm to 100 mm; Alternatively, the light-guiding device and the double-sided photovoltaic panel are installed alternately.

5. A photovoltaic light guide device for guiding sunlight to the back of a double-sided photovoltaic panel, characterized in that: It is composed of n light pipes arranged and combined to form a light pipe array, with n light input ports facing the sun and transparent end covers, and a light output port turned toward the back of the double-sided photovoltaic panel; sunlight can pass through the transparent end cover, enter the light pipe from the light input port, and after multiple reflections and turns, it is emitted from the light output port, and then emitted to the back of the double-sided photovoltaic panel or reaches the back of the double-sided photovoltaic panel after reflection.

6. The photovoltaic light guide device according to claim 5, characterized in that: n≥1 or 3 or 9 or 27 or 54 or 128; a reflective layer is provided on the inner wall of the light guide tube.

7. The photovoltaic light guide device according to claim 6, characterized in that: In front of the light output port, below the double-sided photovoltaic panel, and from left to right, there are gradually rising reflective plates, which are used to evenly reflect the light emitted from the light output port to the back of the double-sided photovoltaic panel.

8. The photovoltaic light guide device according to claim 7, characterized in that: The reflector is a diffuse reflector, which is used to evenly reflect the light emitted from the light outlet port to the back of the double-sided photovoltaic panel; Alternatively, a diffuse transmission plate is provided in front of the light output port to evenly transmit the light emitted from the light output port to the back of the double-sided photovoltaic panel; Alternatively, the light outlet port is sealed and connected to the back of the double-sided photovoltaic panel; Alternatively, the light input port is hexagonal, and n light guides are arranged and combined into a honeycomb light guide array; Alternatively, the light input port is rectangular, and n light guides are arranged and combined into a rectangular light guide array; Alternatively, the transparent end cap of the light entrance port is connected to a bifacial photovoltaic panel; Alternatively, the light guide tube is an inflatable tube capsule, the tube wall of which has a coated reflective layer, and the light inlet port and the light outlet port have a transparent film layer; Alternatively, the diameter of the light guide tube ranges from 250 mm to 900 mm; Alternatively, the thickness of the light guide tube ranges from 10 mm to 100 mm; Alternatively, the light-guiding device and the double-sided photovoltaic panel are installed alternately.

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