Thin silicon wafers offer high performance and efficiency but are brittle and prone to damage in response to mild impacts. Microcracks in solar cells are not visible unless they spread across the whole cell. However, a microcrack does not affect it until it progresses to block electric current through the cell.
Common causes of front glass damage include heavy rainfall, hailstorm, improper handling, and leaning over panels. While the front glass protects the upper surface, white or black back sheets protect the rear side of cells from water, scuffs, and humidity. Heating and air in Chico, CA, advise not to use substandard material or poor quality control, as they degrade the back sheet.
Microcracks on older panels collectively appear as snail trails and reduce the output faster. Solar panel installation in Oroville, CA, advise you not to buy a new solar panel but instead opt for a repair to revive the performance.