China Central Certification, a leading domestic third-party certification body, recently published a report on the Hi-MO 9 module Hainan demonstration project. Findings show that the Hi-MO 9 module, which adopts second-generation BC technology, significantly outperforms TOPCon modules in three critical areas: standard outdoor power generation, partial shading power generation, and post-shading power generation. The cumulative per-kilowatt power generation advantages reached 0.75%, 32.62%, and 11.34%, respectively, highlighting its outstanding overall performance.
The LONGi Hainan demonstration project is situated in Hongdao Team, Yazhou District, Sanya City. This region, positioned in a low-latitude tropical zone, benefits from year-round abundant sunlight and a tropical maritime monsoon climate. The site includes four module arrays (20 Hi-MO 9 and 20 TOPCon modules each), with two arrays partially shaded and the other two unshaded.
Spanning just over two months (October to December 2024) and monitored by the Certification Center, the project provided a thorough evaluation of power generation performance. It compared cumulative per-watt output and generation across various time intervals, demonstrating the Hi-MO 9 module’s advantages over mainstream TOPCon modules in real-world engineering applications.
Leading in Three Mainstream Scenarios: BC Shows Superiority
Scenario One: Unobstructed Full Sunlight
Under ideal outdoor conditions without any shading, the Hi-MO 9 modules, wielding the highly efficient second-generation BC technology, shine. During the certification period from October 26 to December 30, 2024, tracked and established by the Certification Center, Hi-MO 9 modules demonstrated a cumulative per-kilowatt power generation gain of 0.75% and an area-specific power generation gain of 5.22% over TOPCon modules. With temperature control, the Hi-MO 9 also performed admirably, with an average module back sheet working temperature 0.69℃ lower than that of TOPCon modules and a peak temperature differential of 3.5°C, showcasing high efficiency and stable power generation capacity.
Scenario Two: Simulated Foreign Object Shading Like Bird Droppings
In utility power plants operating outdoors, issues like bird droppings, leaves, and dust causing partial shading of modules are common. During the demonstration period from November 27 to December 4, 2024, with individual module shading of three cells (equivalent to 5% of the area) set up, the Certification Center’s monitoring found a “cliff-like” superiority in Hi-MO 9’s power generation data.
Compared to mainstream TOPCon modules, Hi-MO 9 had a cumulative per-kilowatt power generation gain of 32.62% and an area-specific power generation gain of 37.34%, demonstrating distinct advantages in varying irradiation and weather conditions. Furthermore, Hi-MO 9 achieved a breakthrough in thermal management; under partial shading conditions, Hi-MO 9’s back sheet average temperature was approximately 7.43℃ lower than TOPCon modules, ensuring a cooler working temperature and effectively preventing the safety risks of power plant fires due to partial shading.
Scenario Three: Simulated Co-located Wind and Solar Shadow Shading
Persistent shadow shading is another important factor affecting outdoor power generation at centralized power stations. The project installed individual 5-meter-tall posts, continuously shading the modules for 18 days, and Hi-MO 9’s performance was remarkable.
Monitored and confirmed by the Certification Center, Hi-MO 9 had a cumulative per-kilowatt power generation gain of 11.34% and an area-specific gain of 16.27%, with the Hi-MO 9 module backsheet average temperature still 0.83℃ lower than TOPCon modules, proving its exceptional power generation efficiency.
Time is the best tester. The Hainan demonstration project has comprehensively exhibited LONGi’s Hi-MO 9 modules’ outstanding power generation capabilities in complex outdoor scenarios, which is a testament to LONGi’s continued focus on customer value and pioneering spirit of constant innovation. In the future, the more valuable second-generation BC technology and products will continue to bring increased benefits and surprises to customers worldwide.
