EVA, or ethylene vinyl acetate, is a material with good radiation permeability and low degradation to sunlight. This is a thermoplastic polymer that is used as a packaging agent in solar modules because by applying heat to the solar panel, it forms a sealing and insulating film around the solar panel. It can prevent the entry of air and the formation of water, allowing solar energy to pass through, while resisting the degradation of sunlight over time.
EVA is solid before lamination, and after high-temperature lamination, it changes from solid to liquid, which adheres the solar cell panel and the surface and back materials together, and then changes to solid after temperature reduction. Vinyl acetate sheets play an important role in preventing moisture and dirt from seeping into the solar cell panel. In addition, with the help of EVA, solar cells “float” between the glass and the backplane, helping to reduce shock and vibration, thereby protecting the solar cells and their circuits.
Why choose EVA as the packaging agent for HuanQI solar panels?
Durability: High quality EVA is known for its excellent durability, and has good performance even in harsh weather conditions, such as high temperatures and high humidity.
Adhesion: When appropriate, EVA has excellent adhesion to solar glass (not standard glass, but tempered glass specifically used for solar panels), and the adhesion between EVA and the backplane is also very good.
Light transmittance: EVA is famous for its excellent transparency. This means that it can receive more sunlight without blocking too much sunlight trying to reach the solar cells.
What happens if the EVA quality is poor?
Solar cells are made of silicon, a chemical element that tends to react with other molecules; Its favorite is oxygen. If the EVA quality is poor or the lamination process is incorrect, the silicon wafer may come into contact with water or air (both rich in oxygen), and the solar panel will begin to oxidize, turning yellow or brown, depending on the situation.
How to avoid this problem?
Select high-quality EVA and pass through sufficient high temperature for a long time when laminating solar panels. The time should not be too long or too short, and the temperature should not be too high or too low, otherwise it is easy to delaminate.
If you want to know more about solar panels, please contact us, the solar panel manufacturer – Huanqi Technology (Shenzhen) Co., Ltd.