Structure and composition:
1) Tempered glass is used to protect the main body of power generation (such as batteries), and the selection of light transmission is required.
The transmittance must be high (generally more than 91%);
Ultra-white tempering treatment
2) EVA is used to bond and fix the tempered glass and the main body of power generation (such as battery), the quality of the transparent EVA material directly affects the life of the module, and the EVA exposed to the air is easy to age and turn yellow, thus affecting the light transmittance of the module In addition to the quality of the EVA itself, the lamination process of the module manufacturer is also very influential. For example, the EVA adhesiveness is not up to standard, and the bonding strength between EVA and tempered glass and backplane is not enough, which will cause EVA to prematurely. Aging affects component life.
3) The main function of the cell is to generate electricity. The mainstream in the power generation market is the crystalline silicon solar cell and the thin-film solar cell, both of which have their own advantages and disadvantages. Crystalline silicon solar cells, the equipment cost is relatively low, but the consumption and cell cost are high, but the photoelectric conversion efficiency is also high, and thin-film solar cells are more suitable for power generation in outdoor sunlight. The relative equipment cost is high, but the consumption and battery cost Very low, but the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, but the low-light effect is very good, and it can also generate electricity under ordinary light, such as solar cells on calculators.
4) The role of EVA is as above, mainly bonding and encapsulating the main body of power generation and the backplane solar panel
5) The function of the backplane, sealing, insulation and waterproofing (generally TPT, TPE and other materials must be resistant to aging, most component manufacturers have a 25-year warranty, tempered glass and aluminum alloy are generally no problem, the key lies in the combination with the backplane and the Whether the silicone can meet the requirements.)
6) Aluminum alloy protective laminates play a certain role in sealing and supporting
7) The junction box protects the entire power generation system and acts as a current transfer station. If the module is short-circuited, the junction box automatically disconnects the short-circuit battery string to prevent the entire system from being burned. The most critical thing in the junction box is the selection of diodes, according to the battery in the module. The types of the diodes are different, and the corresponding diodes are also different.
8) Silicone sealing function, used to seal the junction of components and aluminum alloy frames, components and junction boxes. Some companies use double-sided tape and foam to replace silicone. Silicone is commonly used in China. The process is simple, convenient, easy to operate, and cost-effective very low.