Universidad de Valladolid, a Spanish research university, has joined hands with Cobra Instalaciones y Servicios and Universidad de Burgos to initiate a new daylight electroluminescence (dEL) technique for PV module testing. Conventional electroluminescence imaging was not viable due to the need for darkness and outside power, increasing expenses and limiting mass maintenance operations in solar farms. The new self-powered method has used current from neighboring PV strings while applying a controlled switching process to filter daylight during field inspections. Field tests were conducted under different irradiance conditions, and researchers confirmed image quality was comparable to conventional darkroom electroluminescence techniques. This technique, as stated in the research, has allowed the entire PV strings to be inspected without module dismounting or bidirectional inverters. Researchers stated the method has minimized operational complexity, decreased inspection time, and cost savings, making photovoltaic module maintenance more feasible for large installations.