The most common reason for yellow solar panels is because of a chemical reaction causing acetic acid to form. Solar panel discoloration is typically the result of long-term exposure to the elements, such as sunlight, rain, and dust. However, severe discoloration could. "Yellowing" of PV modules is defined as the optical degradation of the ethyl vinyl acetate (EVA) where the clear encapsulant becomes visibly yellow or even brown. When some chemicals are used to clean the panels' glass or if there are traces of this chemical in the air, acetic acid can develop, and low-quality panels' ethylene. Solar panel discoloration can occur due to various factors, including degradation, hot spots, EVA degradation, and backsheet deterioration, impacting the panel's performance and efficiency.
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