LONGi BC modules outperform TOPCon in Qinghai rooftop test

LONGi, a Chinese PV module manufacturer, has performed a rooftop field test in April this year in Qinghai Province, China. The test location was at 2,327 meters above sea level and offered around 2,500 sunshine hours annually. The test compared 11.7 kW of HPBC 2.0 Back Contact modules and 49.8 kW of TOPCon modules, both installed on fixed-tilt 10° arrays with identical dimensions. According to LONGi, the HPBC 2.0 modules generated 288.21 kWh/kW, exceeding TOPCon’s 279.95 kWh/kW by 2.95%. On cloudy days, LONGi reported a 3.16% gain due to improved weak-light response and faster activation. The company said that the advantage on sunny days was 2.82%. LONGi attributed the higher output to TaiRay silicon wafers, dual-polar composite passivation, and a front surface free of metal grid lines.