Why the Back Sheet Solar Panel is More Than Just a Layer If you’ve ever pulled a solar panel apart—well, I hope not—it would quickly become clear that the backsheet is no mere afterthought. It’s that unsung hero, protecting the delicate photovoltaic cells from the brutal realities of weather, UV degradation, and even some pretty nasty mechanical abuse. I remember working alongside engineers who’d swear by the choice of backsheet material as the single most critical factor in panel longevity. Oddly enough, a lot of folks don’t realize how much that little layer influences overall system health …