Structural Composition Of Solar Panel

1) Tempered glass
Its function is to protect the main body of power generation (such as battery chips), and the selection of light transmittance is required. 1. The light transmittance must be high (generally above 91%); 2. Ultra white steel treatment
2） EVA
Used to bond and fix tempered glass and power generation bodies (such as battery cells), the quality of transparent EVA materials 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, thereby affecting the power generation quality of the component. In addition to the quality of the EVA itself, the lamination process of the component manufacturer also has a significant impact, such as substandard EVA adhesive strength, and insufficient adhesion strength between EVA and tempered glass and backplane, Can cause premature aging of EVA, affecting component life.
3) Battery chip
The main role is to generate electricity. The mainstream in the power generation market is crystalline silicon solar cells and thin film solar cells, both of which have advantages and disadvantages. Crystalline silicon solar cells have relatively low equipment costs, but high consumption and cell costs, but also high photoelectric conversion efficiency, making them suitable for outdoor solar power generation; Thin film solar cells have relatively high equipment costs, but their consumption and battery costs are very low. However, their photoelectric conversion efficiency is more than half that of crystalline silicon cells, but their weak light effect is very good. They can also generate electricity under ordinary lighting, such as solar cells on calculators.
4）EVA
Solar panels
The function is as follows: mainly bonding and encapsulating the power generation main body and back plate
5) Back plate
Function, sealing, insulation, and waterproofing (Generally, materials such as TPT and TPE must be resistant to aging, and most component manufacturers have a 25-year warranty. Tempered glass and aluminum alloys generally have no problems. The key is whether the backplane and silicone can meet the requirements.)
6) Aluminum alloy
Protect the laminated parts and play a certain sealing and supporting role
7) Junction box
Protects the entire power generation system and acts as a current transfer station. If the component is short-circuited, the junction box automatically disconnects the short circuit battery string to prevent burning the entire system. The most critical issue in the junction box is the selection of diodes, which vary depending on the type of battery cells in the module
8) Silicone
The sealing function is used to seal the junction between the assembly and the aluminum alloy frame, and between the assembly and the junction box. Some companies use double-sided adhesive strips and foam to replace silica gel, which is widely used in China. The process is simple, convenient, easy to operate, and the cost is very low.