LONGi's Back Contact Technology Sets New Standards in PV Performance and Reliability

On December 2, 2025, LONGi made headlines by announcing ambitious results from its global field performance tests of the Back Contact (BC) technology platform and its latest Hi-MO9 solar module. This initiative, developed in cooperation with international clients and respected third-party entities, demonstrates significant advancements in solar energy efficiency and stability.

The data gathered from extensive global field testing reveal that the Hi-MO9 module delivers consistent power generation achievements, significantly surpassing initial expectations in various real-world scenarios. This comprehensive testing program began soon after the technology's launch and was instrumental in evaluating its operational capabilities on a global scale.

Exceeding Expectations in Power Generation

A series of reports from authoritative technical service organizations highlights that LONGi’s BC modules have exhibited stable growth in electricity output, achieving watt-for-watt performance that outperforms mainstream TOPCon modules. The reported efficiency improvements range from 1.21% to 3.92% worldwide, with certain conditions yielding even better outcomes.

For instance, a study conducted by Enertis Applus+, a well-known technical service provider in Europe, assessed a 47MW single-axis solar tracker PV project located in Seville, Spain. The results revealed that during its first operational year, the Hi-MO9 achieved 2,209 equivalent full-load hours, generating power that was 2.4% to 3.4% higher than comparable TOPCon modules. The overall levelized cost of electricity (LCOE) for the Hi-MO9 was also reported to be 3.92% to 4.47% lower, demonstrating remarkable economic advantages.

Additional validation came from the Institute of Photovoltaic Energy (IPVF) which evaluated two 50MW ground-mounted PV plants in France and Denmark. The findings indicated an average power generation performance of 1.84% greater than that of TOPCon modules in the same settings, alongside LCOE reductions of 3.32% and 2.43% respectively.

Enhanced Safety through HPBC 2.0 Technology

Beyond the impressive power generation capabilities, the Hi-MO9 leverages HPBC 2.0 technology designed to minimize safety risks associated with hot spot effects. Data collected under normal partial shading conditions highlight that the Hi-MO9 remarkably suppresses hot spot temperatures, thus reducing potential issues related to material aging and the risk of localized overheating, which could lead to fires. This innovation strengthens the long-term reliability of solar plants, ensuring efficient operation for over 25 years.

A New Paradigm in Solar Technology Assessment

LONGi's extensive testing regime for the Hi-MO9 signifies a transformative approach toward evaluating solar technology. Instead of relying solely on theoretical predictions or limited trials, these results are grounded in real-world performance over an extended period. This new methodology showcases the Hi-MO9's comprehensive advantages in energy production efficiency, LCOE control, and adaptability to various environmental conditions, marking it as a game-changer in the solar industry.

In conclusion, the recent findings from LONGi not only reaffirm the efficacy of its Back Contact technology but also provide vital insights for global photovoltaic (PV) customers. These results serve as a robust foundation for informed decision-making regarding future technology pathways and applications, ensuring significant strides towards enhanced solar energy solutions.