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.
The fixed-tilt (10° inclination) solar test site in Xining, Qinghai Province — situated at 2,327m altitude with 2,500 annual sunshine hours in a semi-arid plateau climate — conducted a comparative study between LONGi’s HPBC 2.0 Hi-MO 9 modules (650W power, 11.7kW system capacity, 2382×1134mm) and TOPCon modules (610W power, 49.8kW system capacity, identical dimensions), revealing critical insights into high-altitude photovoltaic performance.
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%.
BC TOPCon
2. Weather-Specific Performance
Overcast 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.
BC TOPCon
Sunny Conditions (April 12): BC maintained a 2.82% generation advantage under full sunlight, again exhibiting earlier morning startup than TOPCon.
BC 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 aims to be the world’s most valuable solar technology company, driving comprehensive energy transition through customer-centric innovation.
As a global industry leader, LONGi invested CNY 5.014 billion in R&D in 2024, representing 6.07% of annual revenue, maintaining technological leadership with dual world efficiency records in monocrystalline silicon single-junction cells and perovskite-silicon tandem cells. LONGi leads in ESG performance with its 2024 MSCI rating upgraded to BBB, achieving the highest ESG scores among A+H-listed semiconductor companies and ranking first in the photovoltaic sector. As China’s first PV enterprise to join RE100, EP100, EV100 and SBTi initiatives, LONGi remains committed to advancing green development and building a carbon-neutral future.
www.longi.com
