The test installed 20 modules—10 Jinko TOPCon modules and 10 N-type BC modules—all mounted on fixed racks at a 20-degree tilt angle on a concrete rooftop, with a 0.5-meter clearance from the ground. The results show that Jinko’s N-type TOPCon module (model: JKM575N-72HL4-BDV) delivered significantly higher comprehensive power generation performance compared to the tested N-type BC modules from another manufacturer, achieving an average power gain of 5.09%.
Analysis reveals that this notable performance advantage stems from two core strengths of Jinko’s N-type TOPCon technology:
Superior Low-Light Performance: TOPCon modules excel in low-light conditions, particularly during early mornings and evenings (irradiance <500 W/m²). This is attributed to the TOPCon cell structure, which incorporates a tunneling oxide layer to minimize leakage pathways. In contrast, competing technologies with dense backside electrode grids face exacerbated leakage issues under low irradiance. Additionally, TOPCon’s higher shunt resistance (Rsh) reduces current loss in low-light environments, maintaining robust power output.
High Bifaciality Advantage: In rooftop PV applications with limited installation space and low mounting heights, TOPCon bifacial modules leverage their industry-leading 85% bifaciality to efficiently capture scattered and reflected light, significantly boosting energy yield. TOPCon’s dual-sided contact structure (with grids/electrodes on both sides) and thinner poly-Si layer minimize parasitic absorption while enhancing rear-side current. This design maximizes power generation and economic returns for end users.
Under China’s post-531 policy electricity pricing mechanisms, Jinko’s N-type TOPCon modules optimize revenue by harnessing morning/evening sunlight and ground-reflected light during peak tariff periods.
