LONGi announced that its upgraded Hi-MO 9 solar panel with back-contact “HPBC 2.0” technology has reached 24.8% efficiency with a maximum power output of 670 W.
By integrating zero busbars with half-cell architecture, LONGi was able to boost the modules power output by 10 W. The optimized rear-side grid design elevates the panel’s bifaciality to over 80%, the company claims. The back-contact Hi-MO 9 delivers 1.5% more better efficiency than TOPCon brands.
Additionally, LONGi announced it has reached 27.81% efficiency for its self-developed heterojunction interdigitated back contact (HIBC) solar cells, as certified by Germany’s ISFH (Institute for Solar Energy Research Hamelin).
To further amplify the market potential of high-efficiency BC technology, LONGi partnered with TÜV Rheinland to launch the “Global Optimal BC Solar Power Plant Design Challenge.” The competition, open to consultancies, EPC firms and renewable energy investors worldwide, invites innovative designs for ground-mounted power plant projects exceeding 50 MW across diverse application scenarios. Submissions will be accepted from April 11 to November 30, 2025. TÜV Rheinland will lead an expert panel in rigorously evaluating entries based on BC technology integration, PVsyst simulation results and design innovation. The total prize purse amounts to approximately $280,000.
Dennis She, Vice President of LONGi, emphasized: “BC technology represents the ultimate advancement in crystalline silicon solar cells. With a mature global ecosystem, high-efficiency BC modules are rapidly being deployed across diverse applications. The upgraded Hi-MO 9, powered by HPBC 2.0, will deliver unparalleled value to customers worldwide. We are committed to sharing BC innovations with global partners to build a sustainable future.”
News item from LONGi
