China’s Central Certification Centre has released a report on a demonstration project involving LONGi Hi-MO 9 modules in Hainan, data indicating that the module, utilizing second generation BC technology, significantly outperforms TOPCon equivalents in the three key aspects of normal outdoor, partial shading and post shading power generation. The cumulative per-kilowatt power generation gains were 0.75%, 32.62% and 11.34% respectively.
The Hainan demonstration project is located in Sanya City, an area with a tropical maritime monsoon climate. The demonstration site was equipped with four module arrays (20 Hi-MO 9 and 20 TOPCon modules each), with two arrays with shaded modules and two unshaded.
Scenario One: Unobstructed Full Sunlight
During the certification period from October 26 to December 30, 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 equivalents. With temperature control, Hi-MO 9 also performed well, with an average module backsheet working temperature 0.69℃ lower than that of TOPCon modules and a peak temperature differential of 3.5℃, showcasing high-efficiency and stable power generation capacity.
Scenario Two: Simulated Foreign Object Shading
In utility power plants operating outdoors, issues like bird droppings, leaves and dust causing partial shading of modules are common. During the demonstration period between November 27 and December 4, with individual module shading of three cells (equivalent to 5% of the area) set up, the Certification Center’s monitoring found a significant superiority in Hi-MO 9’s power generation data, its cumulative per-kilowatt gain of 32.62% and an area-specific gain of 37.34%, demonstrating distinct advantages in varying irradiation and weather conditions.
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, with Hi-MO 9 displaying outstanding performance with a cumulative per-kilowatt power generation gain of 11.34% and an area-specific gain of 16.27%, with a module backsheet average temperature still 0.83℃ lower than TOPCon modules.
