What Makes the Backsheet of Solar Panels So Crucial? If you’ve ever lugged a solar panel on the field, you probably gave some thought to what’s on the underside. The backsheet might not get the glory that the glass surface or the cells do, but, frankly, it’s the unsung hero of the entire panel assembly. In the simplest terms, the backsheet serves as the last line of defense against everything Mother Nature throws at it: moisture, UV rays, mechanical stress, and temperature swings. It’s the quiet guardian that keeps the cells safe and electrically insulated. I remember once handling panels at a…