China General Certification Center (CGC) has released results from a comparative test of LONGi’s Hi-MO 9 back contact (BC) modules and mainstream TOPCon products. The study was conducted at CGC’s Sanmen mudflat PV base in Zhejiang Province between February and April 2025 under coastal environmental conditions. LONGi’s Hi-MO 9 BC modules achieved 1.93% higher cumulative power generation per kilowatt than TOPCon, demonstrating superior adaptability in humid and saline environments. The modules also recorded an average backsheet temperature 1.26°C lower than TOPCon, with the maximum difference reaching 4.13°C. Testing was carried out under challenges such as salt mist, muddy foundations, tidal influences, and high humidity levels affecting module performance. CGC has concluded that LONGi’s HPBC 2.0 technology demonstrated stronger power output, improved stability, and higher reliability. This verification was the first independent comparison of BC versus TOPCon modules conducted under mudflat and coastal solar project conditions in China. Prior to this, LONGi’s Hi-MO 9 BC modules were compared with TOPCon in IPVF’s France and Denmark tests, where they demonstrated higher yields and lower LCOE in large-scale PV projects.

LONGi Hi-MO 9 BC modules have delivered 1.93% higher energy output than mainstream TOPCon under mudflat field testing.
LONGi Hi-MO 9 BC modules have delivered 1.93% higher energy output than mainstream TOPCon under mudflat field testing. Image Source: LONGi