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The composition of polycrystalline silicon solar panels and the functions of their accessories

1) The function of tempered glass is to protect the power generation body (such as battery cells), and there are requirements for the selection of light transmittance: 1. The light transmittance must be high (generally above 91%); 2. Ultra-white tempered treatment

2) EVA is used to bond and fix tempered glass and power generation bodies (such as battery cells). The quality of transparent EVA material directly affects the life of the component. EVA exposed to the air is prone to aging and yellowing, which affects the light transmittance of the component and thus the quality of the power generation component. In addition to the quality problems of EVA itself, it also has a great impact on the lamination process of the component manufacturer. For example, if the adhesion of EVA is not up to standard, and the bonding strength between EVA and tempered glass and backplane is not enough, it will cause early aging of EVA and affect the life of the component.

3) The main function of the battery is to generate electricity. Currently, the mainstream of the power generation market is crystalline silicon.Solar Cells, thin-film solar cells, both have their own advantages and disadvantages, crystalline silicon solar cells, equipment costs are relatively low, but the consumption and battery costs are very high, but the photoelectric conversion efficiency is also high, outdoor sunlight power generation is more suitable for thin-film solar cells, equipment costs are relatively high, but the consumption and battery costs are very low, but the photoelectric conversion efficiency is relatively low. The photoelectric conversion efficiency of crystalline silicon cells is relatively more than half higher, but the weak light effect is very good, and it can also generate electricity under ordinary light, such as the solar cells on the calculator.

4) The role of EVA is the same as above, mainly bonding and encapsulating the generator and the backplane

5) The function of the back panel is sealing, insulation, and waterproofing (usually made of TPT, TPE and other materials, must be resistant to aging. Most component manufacturers have a 25-year warranty period. Tempered glass and aluminum alloy generally have no problems. The key is whether the back panel and silicone can meet the requirements.

6) Aluminum alloy protective layer plate plays a certain role in sealing and supporting

7) The junction box protects the entire power generation system and acts as a current conversion station. If a component is short-circuited, the junction box automatically disconnects the short-circuited battery string to prevent the entire system from burning. The key in the junction box is the selection of diodes. Depending on the type of battery in the component, the corresponding diodes are also different.

8) The sealing function of silicone is used to seal components and aluminum alloy frames. Some companies use double-sided tape and foam to replace silicone at the connection between components and junction boxes. Silicone is widely used in my country. The process is simple, convenient, easy to operate, and the cost is very low.