These localized areas of extreme heat occur when one or more cells in a panel become overheated, often due to shading, soiling, or internal defects. Hot spots on solar panels are a serious issue that can significantly impact the performance and lifespan of your solar energy system. As a result, the panel gets heated and overloaded, which leads to a short-circuit that lowers output efficiency overall while hastening material deterioration. Learn how Back Contact technology and proper maintenance can prevent costly failures and extend system life. This happens because blocked cells resist current flow, forcing electricity. The hotspot effect is a phenomenon that occurs in everyday usage of solar panels. It is a typical degradation mode in PV modules.