Solar panel structure components: tempered glass Its role is to protect the main body of power generation (such as cells), light transmission its selection is required:
1. The light transmission rate must be high (generally 91% or more)
EVA is used to bond and fix the tempered glass and the main body of the power generation (such as cells), the quality of the transparent EVA material directly affects the life of the component, exposed to the air EVA is easy to age and yellow, thus affecting the light transmission of the component, thus affecting the quality of power generation components in addition to the quality of EVA itself, the lamination process of the component manufacturers is also very significant, such as EVA adhesive degree Not up to standard, EVA and tempered glass, backsheet bonding strength is not enough, will cause early aging of EVA, affecting the life of the module. The main role of the cell is to generate electricity, the main body of power generation market is the mainstream of crystalline silicon solar cells, thin film solar cells, both have advantages and disadvantages.
Crystalline silicon solar cells, equipment costs are relatively low, but consumption and cell costs are very high, but the photoelectric conversion efficiency is also high, more suitable for power generation in outdoor sunlight; thin-film solar cells, relatively high equipment costs, but consumption and cell costs are very low, but the photoelectric conversion efficiency is relatively crystalline silicon cells more than half, but the low light effect is very good, in ordinary light can also generate electricity, such as the calculator on the solar cell. EVA role as above, the main bonding package power generation body and backplane backplane role, sealing, insulation, waterproof (generally used TPT, TPE and other materials must be resistant to aging, most component manufacturers have a warranty of 25 years, tempered glass, aluminum alloy are generally no problem, the key is in the backplane and silicone whether it can meet the requirements.) (The key is whether the backsheet and silicone can meet the requirements).
Aluminum alloy protection laminate, play a certain sealing, support role. Junction box Protect the entire power generation system, play the role of current transfer station, if the component short circuit junction box automatically disconnects the short-circuit battery string, to prevent burning the entire system. The most critical thing in the junction box is the choice of diodes, according to the different types of cells in the module, the corresponding diodes are different. Silicone sealing role, used to seal the components and aluminum alloy frame, components and junction box junction. Some companies use double-sided tape, foam to replace silicone, the domestic common use of silicone, the process is simple, convenient, easy to operate, and the cost is very low.
