Recent operational data from a rooftop demonstration PV plant at a residential complex in Qinghai, China, reveals that BC (Back Contact) modules delivered 3.16% higher power generation than TOPCon modules, further validating BC technology's superior performance.
Located in Xining, Qinghai Province (2,327m altitude, 2,500 annual sunshine hours, continental plateau semi-arid climate), the fixed-tilt (10° inclination) test site compared LONGi's HPBC 2.0 Hi-MO 9 BC modules (11.7kW capacity, 650W power, 2382x1134mm dimensions) against TOPCon modules (49.8kW capacity, 610W power, same dimensions).
1. Monthly Generation Comparison
A string-level comparison normalized to per-kilowatt output showed BC modules generated 288.21 kWh/kW in April, outperforming TOPCon's 279.95 kWh/kW by 2.95%.
2. Weather-Specific PerformanceOvercast Conditions (April 14): BC modules achieved 3.16% higher per-kilowatt output than TOPCon, with data analysis (5-minute interval monitoring) demonstrating BC's superior weak-light response. BC systems initiated power generation earlier and maintained higher output during low-irradiance morning hours.
Sunny Conditions (April 12): BC maintained a 2.82% generation advantage under full sunlight, again exhibiting earlier morning startup than TOPCon.
LONGi's HPBC 2.0 technology integrates proprietary TaiRay silicon wafers with advanced dual-polar composite passivation technology. Its front grid line-free design enables breakthrough improvements in light absorption and power generation efficiency, delivering distinct performance advantages over TOPCon.
About LONGi
Founded in 2000, LONGi is committed to being the world’s leading solar technology company, focusing on customer-driven value creation for full scenario energy transformation.
Under its mission of 'making the best of solar energy to build a green world', LONGi has dedicated itself to technology innovation and established five business sectors, covering mono silicon wafers cells and modules, commercial & industrial distributed solar solutions, green energy solutions and hydrogen equipment. The company has honed its capabilities to provide green energy and has more recently, also embraced green hydrogen products and solutions to support global zero carbon development. www.longi.com/