Why EVA Turns Yellow in Solar Modules: Causes and Prevention
EVA encapsulant is designed to remain transparent so sunlight can pass through to the solar cells. But after long-term outdoor exposure, some modules develop yellow or brown areas inside the encapsulation layer. This change is not always just visual. When EVA loses transparency, it can reduce the amount of light reaching the cells and may indicate that the encapsulant has started to degrade. Understanding why EVA turns yellow in solar modules can help manufacturers identify the factors that influence encapsulant colour stability and maintain long-term module performance. Raynex Solar manufactures EVA, POE and EPE solar encapsulant sheets for PV module production. In EVA-based modules, yellowing is usually linked to a combination of UV exposure, heat, material formulation and processing conditions rather than one single cause. What Is EVA Yellowing in a Solar Module? EVA yellowing in solar modules is a gradual change in the encapsulant from clear to yellow. In more severe cases, the ...