Photovoltaic power generation system and photovoltaic light guide device

Abstract

This application provides a photovoltaic power generation system and a photovoltaic light guide device for enhancing power generation efficiency. The system includes a bifacial photovoltaic panel with a light guide device installed next to it. The light guide device is an array of n light guide tubes arranged in a specific configuration, having an input port, an output port, and a transparent end cap. Sunlight enters the light guide tube through the input port, undergoes multiple reflections, and exits through the output port, eventually reaching the back of the bifacial photovoltaic panel. This application improves power generation efficiency and reduces the cost per kilowatt-hour.

Description

Technical Field

[0001] This application belongs to the field of new energy technology such as photovoltaic power generation, and specifically relates to a photovoltaic power generation system and photovoltaic light guide device that can guide direct sunlight from the periphery of a photovoltaic panel to the back of the photovoltaic panel through a photovoltaic light guide device to improve the efficiency of photovoltaic power generation. Background Technology

[0002] Bifacial photovoltaic (PV) panels are specially designed photovoltaic modules with bifacial power generation capabilities. They can generate electricity not only by absorbing direct sunlight on the front but also by absorbing reflected / scattered light on the back. Several application schemes utilize the back of bifacial PV panels to receive reflected / scattered light to improve power generation efficiency. Firstly, ground reflection enhancement involves placing high-reflectivity ground materials, such as white pebbles, reflective films, or light-colored coatings, below or around the bifacial PV panels. This design significantly increases the amount of reflected light received on the back, making it particularly suitable for deserts, wastelands, and areas with abundant sunlight. Secondly, increasing the angle of the bifacial support structure involves installing the bifacial PV panels on specially designed bifacial supports and adjusting the tilt angle according to geographical location and sunlight conditions. This allows both the front and back of the PV panels to receive more sunlight. For example, installing them on a support structure at a certain height increases the reception angle on the back, making it particularly suitable for areas with weak sunlight. Third, floating installation on water surfaces: Floating double-sided photovoltaic panels are installed on the surface of reservoirs, ponds, lakes, etc., utilizing the light reflected from the water to illuminate the back side, further increasing power generation. This method also utilizes the cooling effect of water to improve the efficiency of the modules and extend the lifespan of the photovoltaic panels. Fourth, agricultural-solar complementary systems: In agricultural areas, double-sided photovoltaic panels are suspended above farmland. The back side not only utilizes light reflected from the ground but also avoids the impact of shading on crop growth, achieving the dual purpose of agriculture and animal husbandry. This application is suitable for both agriculture and animal husbandry, especially in areas with abundant sunshine. Fifth, building surface applications: Double-sided photovoltaic panels are installed on building curtain walls, roofs, or balconies, allowing the back side of the photovoltaic panels to generate electricity using reflected and scattered light from the building and its surrounding environment. This solution is suitable for high-rise buildings, commercial complexes, and other structures, especially in urban areas with limited space. Sixth, photovoltaic parking sheds: Double-sided photovoltaic panels are installed above parking lots, utilizing reflected light from the ground and parked vehicles on the back to increase sunlight reception. This type of solution not only provides shade for the parking shed but also charges electric vehicles or provides power to nearby buildings, making it a multi-functional and efficient utilization method. Seventh, hillside and wasteland enhancement design: Double-sided photovoltaic panels are installed in mountainous or irregularly shaped wastelands, with the design considering the tilt angle behind the panels to utilize the terrain's reflective effect. This method not only makes full use of the land but also utilizes diffused light, making it particularly suitable for areas with strong sunlight on slopes. These solutions improve the power generation efficiency of double-sided photovoltaic panels in different ways, making full use of reflected and diffused light resources in the natural environment.

[0003] Through research and testing, the applicant found that the power generation efficiency improvement of existing application solutions such as the aforementioned bifacial 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 efficiency-enhancing photovoltaic power generation system that guides nearby sunlight to the back of a double-sided photovoltaic panel, thereby improving photovoltaic power generation efficiency and reducing the cost per kilowatt-hour.

[0005] The second objective of this application is to provide a photovoltaic light guide device for directing nearby sunlight to the back of a double-sided photovoltaic panel, thereby improving photovoltaic power generation efficiency and reducing the cost per kilowatt-hour.

[0006] To achieve one of the above-mentioned objectives, this application provides a light-guiding and efficiency-enhancing photovoltaic power generation system as follows.

[0007] This application provides a light-guiding photovoltaic power generation system, including a bifacial photovoltaic panel that receives direct sunlight on its front side (as well as connecting wires, brackets, inverters, combiner boxes, energy storage facilities, and other components required for a photovoltaic power generation system). The system is characterized by a light-guiding device installed next to the bifacial photovoltaic panel. This light-guiding device consists of n light guide tubes arranged in an array (module), having n sun-facing light-inlet ports and transparent end caps, and light-outlet ports that curve towards the back of the bifacial photovoltaic panel. Sunlight passes through the transparent end caps, enters the light guide tubes from the light-inlet ports, undergoes multiple reflections and bends, and exits from the light-outlet ports, then reaches or is reflected back to the back of the bifacial photovoltaic panel, where it is absorbed and generates electricity. In short, the light-guiding device directs nearby sunlight to the back of the bifacial photovoltaic panel, thereby increasing power generation.

[0008] Preferably, the light-guiding efficiency-enhancing photovoltaic power generation system is characterized by: n ≥ 1, 3, 9, 27, 54, or 128; and a reflective layer is attached to the inner wall of the light guide tube. The larger n is, the more uniform the collected and output light is, the less light loss there is, and the less it is affected by different sunlight incident angles at different times of day (morning, noon, evening), which is more conducive to the efficient power generation of photovoltaic cells. n ≥ 9 is preferable, and n ≥ 27 is the most desirable.

[0009] Preferably, the light-guiding and efficiency-enhancing photovoltaic power generation system is characterized in that: a reflector is provided in front of the light-emitting port, below the double-sided photovoltaic panel, and from left to right, which is used to uniformly reflect the (sunlight) light emitted from the light-emitting port to the back of the double-sided photovoltaic panel.

[0010] Preferably, the light-guiding and efficiency-enhancing photovoltaic power generation system is characterized by:

[0011] The reflector is a diffuse reflector, used to uniformly reflect the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel;

[0012] Alternatively, a diffuser plate is provided in front of the light-emitting port to evenly transmit the (sunlight) light emitted from the light-emitting port to the back of the double-sided photovoltaic panel.

[0013] Alternatively, the light-emitting port can be sealed to the back of the double-sided photovoltaic panel to prevent dust from entering the light guide tube and causing a decrease in reflectivity;

[0014] Alternatively, the light input port is hexagonal, and n light guides are arranged in a honeycomb light guide array;

[0015] Alternatively, the light input port is rectangular, and n light guides are arranged and combined to form a rectangular light guide array;

[0016] Alternatively, the transparent end cap of the light-inlet port can be connected to the double-sided photovoltaic panel;

[0017] Alternatively, the light guide tube is an inflatable tube with a reflective coating on its wall and a transparent film on its light inlet and light outlet ports.

[0018] Alternatively, the diameter of the light guide tube can range from 250mm to 900mm.

[0019] Alternatively, the thickness of the light guide tube can range from 10mm to 100mm.

[0020] Alternatively, light guide devices can be installed alternately with double-sided photovoltaic panels.

[0021] To achieve the second objective of the invention mentioned above, this application provides a photovoltaic light guide device as follows.

[0022] This application provides a photovoltaic light guide device for guiding sunlight to the back of a double-sided photovoltaic panel. Its features include: it is composed of n light guide tubes arranged in an array (module), having n light-inlet ports facing the sun and their transparent end caps, and light-outlet ports that curve toward the back of the double-sided photovoltaic panel; sunlight can pass through the transparent end caps, enter the light guide tube from the light-inlet ports, undergo multiple reflections and bends, and then exit from the light-outlet ports, subsequently reaching the back of the double-sided photovoltaic panel or arriving at the back of the double-sided photovoltaic panel after reflection.

[0023] Preferably, the photovoltaic light guide device is characterized by: n ≥ 1, 3, 9, 27, 54, or 128; a reflective layer is attached to the inner wall of the light guide tube. The larger n is, the more uniform the collected and output light is, the less light loss there is, and the less it is affected by different sunlight incident angles at different times of day (morning, noon, evening), which is more conducive to the efficient power generation of photovoltaic cells. n ≥ 9 is preferred, and n ≥ 27 is the most desirable.

[0024] Preferably, the photovoltaic light guide device is characterized in that: a reflector is provided in front of the light output port, below the double-sided photovoltaic panel, and from left to right, which is used to uniformly reflect the (sunlight) light emitted from the light output port to the back of the double-sided photovoltaic panel.

[0025] Preferably, the photovoltaic light guide device is characterized in that:

[0026] The reflector is a diffuse reflector, used to uniformly reflect the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel;

[0027] Alternatively, a diffuser plate is provided in front of the light-emitting port to evenly transmit the (sunlight) light emitted from the light-emitting port to the back of the double-sided photovoltaic panel.

[0028] Alternatively, the light-emitting port can be sealed to the back of the double-sided photovoltaic panel to prevent dust from entering the light guide tube and causing a decrease in reflectivity;

[0029] Alternatively, the light input port is hexagonal, and n light guides are arranged in a honeycomb light guide array;

[0030] Alternatively, the light input port is rectangular, and n light guides are arranged and combined to form a rectangular light guide array;

[0031] Alternatively, the transparent end cap of the light-inlet port can be connected to the double-sided photovoltaic panel;

[0032] Alternatively, the light guide tube is an inflatable tube with a reflective coating on its wall and a transparent film on its light inlet and light outlet ports.

[0033] Alternatively, the diameter of the light guide tube can range from 250mm to 900mm.

[0034] Alternatively, the thickness of the light guide tube can range from 10mm to 100mm.

[0035] Alternatively, light guide devices can be installed alternately with double-sided photovoltaic panels.

[0036] The light guide tube described in this application is a commonly used optical device, mainly used in daylighting systems, to guide outdoor natural light to the area requiring illumination. To ensure efficient light transmission, the inner wall of the light guide tube must be made of a high-reflectivity material. Light guide tubes are existing technology products, and their specific technical details will not be elaborated here.

[0037] Compared with the prior art, this application has the following beneficial technical effects.

[0038] Firstly, the light guide device installed next to the double-sided photovoltaic panel can guide the nearby sunlight to the back of the double-sided photovoltaic panel, which can collect and utilize the sunlight that would otherwise be wasted, thus improving the system's power generation efficiency. Tests show that the system's power generation efficiency has been improved by 50-75%.

[0039] Secondly, the ratio of the 50-75% increase in electricity output to the investment in the light guide device, i.e., the investment cost of back-side power generation, is far less than the investment cost of purchasing photovoltaic panels for front-side power generation with the same investment. Therefore, the cost per kilowatt-hour of photovoltaic power generation can be significantly reduced. For example, with the same investment of 200 RMB, if a new single-sided photovoltaic panel is purchased, 290 watts (i.e., half a nominal 580-watt photovoltaic panel) can be added; while spending 50 RMB to purchase the inflatable tube-type light guide device described in this application, which directs nearby sunlight to the back of a nominal 580-watt double-sided photovoltaic panel, can add 290 watts, saving 75% of the investment cost.

[0040] Thirdly, compared with the prior art "A high-efficiency solar cell (CN202434551U)" and other methods that use plane mirrors to enhance efficiency, this application provides uniform light, very little light loss, and is not affected by different sunlight incident angles at different times of day, such as morning, noon, and evening. Attached Figure Description

[0041] Figure 1 This is a top view schematic diagram of the combined application of a (honeycomb) photovoltaic light guide device and a double-sided photovoltaic panel according to Embodiment 1 of this application.

[0042] Figure 2 for Figure 1 A schematic diagram of the longitudinal section structure at position AB.

[0043] Figure 3 for Figure 1 A schematic diagram of another longitudinal section structure at position AB.

[0044] Figure 4 for Figure 1 A schematic diagram of another longitudinal section structure at position AB.

[0045] Figure 5 The photovoltaic power generation system with light-guiding efficiency enhancement adopted in this application Figure 1 The diagram shows the effect of the photovoltaic light guide device and the double-sided photovoltaic panel array.

[0046] Figure 6 This is a top view schematic diagram of the application of a (rectangular) photovoltaic light guide device in conjunction with a double-sided photovoltaic panel according to Embodiment 2 of this application.

[0047] Figure 7 for Figure 6 A schematic diagram of a longitudinal section structure at position CD.

[0048] Figure 8 The photovoltaic power generation system with light-guiding efficiency enhancement adopted in this application Figure 6 The diagram shows the effect of the photovoltaic light guide device and the double-sided photovoltaic panel array.

[0049] Figure 9 This is a schematic diagram showing the external shape of an inflatable light guide tube that can be combined and arranged into a photovoltaic light guide device.

[0050] Figure 10 This is a schematic diagram showing the external shape of another type of inflatable light guide tube that can be combined and arranged into a photovoltaic light guide device.

[0051] Figure 11 This is a schematic diagram showing the external shape of another type of inflatable light guide tube that can be combined and arranged into a photovoltaic light guide device.

[0052] Figure 12 This is a schematic diagram showing the external shape of another type of inflatable light guide tube that can be combined and arranged into a photovoltaic light guide device.

[0053] Figure 13 The photovoltaic power generation system with light-guiding efficiency enhancement adopted in this application Figure 6 The diagram shows the effect of alternating installation of photovoltaic light guide devices and double-sided photovoltaic panels.

[0054] Figure 14 for Figure 12 A schematic diagram of the light guide device formed by the arrangement of five inflatable tubes.

[0055] Figure 15 This is a cross-sectional schematic diagram of a vertical photovoltaic light guide device used in conjunction with a double-sided photovoltaic panel, according to Embodiment 3 of this application.

[0056] Explanation of the reference numerals: 1-Light guide tube, 2-Light guide device, 3-Light inlet port, 4-Light outlet port, 5-Double-sided photovoltaic panel, 6-Reflector, 7-Transparent end cap, 8-Inflatable tube, 9-Diffuse transmission plate, 10-Sunlight, 11-Transparent film end cap. Detailed Implementation

[0057] To make the technical means, creative features, objectives and effects of this application easier to understand, the following describes this application in conjunction with specific implementation methods.

[0058] In the description of this application, it should be noted that the terms "left", "right", "front", "rear", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0059] It should be noted that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] Example 1.

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a photovoltaic light guide device 2 is first fabricated to guide sunlight 10 to the back of the double-sided photovoltaic panel 5. For example, n hexagonal L-shaped light guide tubes 1, made of rigid materials such as PVC, with an inner wall coating reflectivity greater than 95%, and a diameter of 90mm, can be arranged and combined to form a light guide tube array (module), thereby fabricating a photovoltaic light guide device 2 module. This photovoltaic light guide device 2 module needs to have n sun-facing (light guide tube 1) light-inlet ports 3 and their transparent end caps 7 (the transparent end caps 7 are used to prevent dust from entering the light guide tube 1 and reducing reflectivity), and also needs to have light-outlet ports 4 facing the back of the double-sided photovoltaic panel 5; so that sunlight 10 can pass through the transparent end caps 7, enter the light guide tube 1 from the light-inlet ports 3, and after multiple reflections and bends, exit from the light-outlet ports 4, and then be directed towards 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.

[0062] The number n of the light guide tubes 1 constituting the photovoltaic light guide device 2 is preferably ≥27, 54 or 128; the inner wall of the light guide tube 1 is preferably covered with a reflective layer such as a low-cost metal coating with a reflectivity greater than 95%.

[0063] Preferably, a diffuser plate 9 is provided in front of the light-emitting port 4 to evenly distribute (i.e., evenly transmit) the sunlight 10 (light rays) emitted from the light-emitting port 4 to the back of the double-sided photovoltaic panel 5. The diffuser plate 9 is preferably (e.g., Figure 3 (As shown) It is sealed to the back of the double-sided photovoltaic panel 5 to prevent dust from contaminating the panel surface and causing a decrease in its light transmittance, and to prevent dust from entering the light guide tube 1 and reducing the reflectivity, thus causing sunlight loss); or, the light inlet port 3 is hexagonal, and n light guide tubes 1 are arranged in a honeycomb light guide tube array; or, the diameter of the light guide tube 1 is in the range of 250mm-900mm; or, the thickness of the light guide tube 1 is in the range of 10mm-100mm.

[0064] Finally, as Figure 5 As shown, by laying numerous photovoltaic light guide devices 2 and double-sided photovoltaic panels 5 onto the existing photovoltaic support structure, and configuring the existing photovoltaic power generation system with necessary components such as connecting lines, supports, inverters, combiner boxes, and energy storage batteries, a centralized ground-mounted photovoltaic power station can be constructed.

[0065] Example 2.

[0066] like Figure 6 , Figure 7 , Figure 11As shown, a photovoltaic light guide device 2 is first fabricated to guide sunlight 10 to the back of the double-sided photovoltaic panel 5. For example, n rectangular or wedge-shaped light guide tubes 1, made of rigid 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 into a light guide tube array to form a photovoltaic light guide device 2 module. This photovoltaic light guide device 2 module needs to have n sun-facing (light guide tube 1) light-in ports 3 and their transparent end caps 7, and also needs to have light-out ports 4 facing the back of the double-sided photovoltaic panel 5; so that sunlight 10 can pass through the transparent end caps 7, enter the light guide tube 1 from the light-in port 3, and after multiple reflections and bends, exit from the light-out port 4, and then reach 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.

[0067] 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 covered with a low-cost reflective layer such as a metal coating with a reflectivity greater than 95%.

[0068] Preferably, a reflector 6 is provided in front of the light-emitting port 3, below the double-sided photovoltaic panel 5, and from left to right, which is used to evenly distribute (i.e. evenly reflect) the sunlight 10 (light rays) emitted from the light-emitting port 4 to the back of the double-sided photovoltaic panel 5.

[0069] Preferably, the reflector 6 is a diffuse reflector.

[0070] The most preferred option is, such as Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 14 As shown, a vertically bent inflatable tube 8 is used as the light guide tube 1. The inner side of the tube wall has a coated reflective layer, and the light input port 3 and the light output port 4 have transparent film end caps 11. The photovoltaic light guide device 2 composed of this inflatable tube 8 type light guide tube 1 is lightweight, durable, economical, and easy to transport and install. It can be transported without inflation and can be inflated again during installation. It can be tied to the double-sided photovoltaic panel 5 with a few thin ropes, just like fixing a balloon.

[0071] Finally, as Figure 8 As shown, by laying numerous photovoltaic light guide devices 2 and bifacial photovoltaic panels 5 onto the existing photovoltaic support structure, and configuring components such as connection lines, inverters, combiner boxes, and energy storage facilities that are required in an existing photovoltaic power generation system, a centralized ground-mounted photovoltaic power station can be constructed. Ideally, as shown... Figure 13 As shown, the light guide device 2 and the double-sided photovoltaic panel 5 are installed alternately to reduce the amount of double-sided photovoltaic panel 5 used and reduce system cost.

[0072] Example 3.

[0073] like Figure 15 As shown, referring to the previous two examples, a thin photovoltaic light guide device 2 is fabricated and erected on the side of the double-sided photovoltaic panel 5 to guide sunlight 10 from the side to the back of the double-sided photovoltaic panel 5. In this way, sunlight 10 from the side can pass through the transparent end cap 7 into the light guide tube 1, and after multiple reflections and bends, it can be directed from the light outlet 4 (of the light guide tube 1) to the back of the double-sided photovoltaic panel 5.

[0074] The above-disclosed embodiments are merely preferred embodiments of this application. The accompanying drawings are only schematic diagrams and are not drawn to scale. They cannot be used to limit the scope of this application. Equivalent variations made based on the claims of this application still fall within the scope of this application.

Claims

1. A light-guiding and efficiency-enhancing photovoltaic power generation system, comprising a double-sided photovoltaic panel that receives direct sunlight on its front side to generate electricity, characterized in that: A light guide device is installed next to the double-sided photovoltaic panel. The light guide device is composed of n light guide tubes arranged in combination to form a light guide tube array. It has n light-inlet ports facing the sun and their transparent end caps, and light-outlet ports that turn towards the back of the double-sided photovoltaic panel. Sunlight passes through the transparent end caps, enters the light guide tubes from the light-inlet ports, and after multiple reflections and bends, it is emitted from the light-outlet ports. It then shines towards 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. Among them, n≥9. The transparent end caps of the light-inlet ports are connected together with the double-sided photovoltaic panel to form a flat plate that receives sunlight from the front and generates electricity.

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

3. The light-guiding and efficiency-enhancing photovoltaic power generation system according to claim 2, characterized in that: A reflector is provided in front of the light-emitting port, below the double-sided photovoltaic panel, and from left to right, which is used to uniformly reflect the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel.

4. The light-guiding and efficiency-enhancing photovoltaic power generation system according to claim 3, characterized in that: The reflector is a diffuse reflector, used to uniformly reflect the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel; Alternatively, a diffuser plate is provided in front of the light-emitting port to uniformly transmit the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel. Alternatively, the light-emitting port can be sealed to the back of the double-sided photovoltaic panel; Alternatively, the light input port is hexagonal, and n light guides are arranged in a honeycomb light guide array; Alternatively, the light input port is rectangular, and n light guides are arranged and combined to form a rectangular light guide array; Alternatively, the light guide tube is an inflatable tube with a reflective coating on its wall and a transparent film on its light inlet and light outlet ports. Alternatively, the diameter of the light guide tube can range from 250mm to 900mm. Alternatively, the thickness of the light guide tube can range from 10mm to 100mm. Alternatively, light guide devices can be installed alternately with double-sided photovoltaic panels.

5. A photovoltaic light guide device for directing sunlight to the back of a double-sided photovoltaic panel, characterized in that: It consists of n light guide tubes arranged in combination to form a light guide tube array, with n light-inlet ports facing the sun and their transparent end caps, and light-outlet ports that turn towards the back of the double-sided photovoltaic panel; sunlight can pass through the transparent end caps, enter the light guide tubes from the light-inlet ports, and after multiple reflections and bends, it is emitted from the light-outlet ports, and then shines towards the back of the double-sided photovoltaic panel or reaches the back of the double-sided photovoltaic panel after reflection; where n≥9, the transparent end caps of the light-inlet ports are connected together with the double-sided photovoltaic panel to form a flat plate that receives sunlight from the front and generates electricity.

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

7. The photovoltaic light guide device according to claim 6, characterized in that: A reflector is provided in front of the light-emitting port, below the double-sided photovoltaic panel, and from left to right, which is used to uniformly reflect the light emitted from the light-emitting 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, used to uniformly reflect the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel; Alternatively, a diffuser plate is provided in front of the light-emitting port to uniformly transmit the light emitted from the light-emitting port to the back of the double-sided photovoltaic panel. Alternatively, the light-emitting port can be sealed to the back of the double-sided photovoltaic panel; Alternatively, the light input port is hexagonal, and n light guides are arranged in a honeycomb light guide array; Alternatively, the light input port is rectangular, and n light guides are arranged and combined to form a rectangular light guide array; Alternatively, the light guide tube is an inflatable tube with a reflective coating on its wall and a transparent film on its light inlet and light outlet ports. Alternatively, the diameter of the light guide tube can range from 250mm to 900mm. Alternatively, the thickness of the light guide tube can range from 10mm to 100mm. Alternatively, light guide devices can be installed alternately with double-sided photovoltaic panels.

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