UV Resistance Coatings — Surface treatments preventing degradation from prolonged sun exposure.

UV resistance coatings are a key part of the protective system for solar panels, designed to combat the damaging effects of ultraviolet radiation from sunlight. UV radiation can cause the degradation of polymeric materials used in the module's encapsulation and backsheet, leading to a loss of transparency, discoloration (yellowing), cracking, and delamination. These issues can severely impact the performance and lifespan of a solar panel.

Coatings and additives are incorporated into various parts of the solar module to provide this resistance. The most common approach is to include UV absorbers and stabilizers directly into the encapsulation material, such as EVA. These additives absorb or neutralize the harmful UV photons, preventing them from damaging the polymer chains.

Similarly, the backsheet and other external polymeric components are often designed with a high degree of UV resistance. The development of new materials with inherent UV stability, such as polyolefin elastomers (POEs), is a significant trend in the industry. The effectiveness of these coatings and materials is directly related to the long-term durability and reliability of the solar module, especially in regions with high solar insolation.