Flashlight

Photovoltaic panels have white spots when illuminated by a flashlight at night

The most common cause of white spots is moisture seeping into the module laminate. A solar module is built like a sandwich, with the solar cells and encapsulant sealed between glass and a backsheet. The edge seal is the first line of defense against the elements. They might seem like a minor cosmetic issue, but these „white spots“ are often the first visible signs of a deeper problem that can compromise a module's performance. . If you've noticed mysterious white spots on your photovoltaic (PV) panels, you're not alone. Here are a few common solar panel problems and solutions- 1. As a result, the panel gets heated and overloaded, which leads to a short-circuit that lowers output efficiency overall while hastening material deterioration.