Abstract: In practical engineering applications, different shadow occlusion may occur in photovoltaic modules caused by foreign bodies, resulting in weakened output performance of module. In this paper, the influence of multi-mode occlusion effect on the output electrical performance of modules based on polysilicon is investigated by experimental method. Results show that 1) the output voltage, current and power of module are greatly affected by different shielding ratio of a single battery, and the larger the shielding area, the greater the power decrease percentage of module; 2) the number of battery occluding pieces shows more significant influence on the output voltage, current and power of module: when the number of occluding pieces is 3, the power decrease percentage of module exceeds 80% under the three time segments; 3) different shielding modes have greater influence on the output current and out power than voltage of module, and the power decrease percentage can exceed 95% when double-row transverse occlusion is used; and 4) different occlusion positions affect the output power mainly by affecting the output current of module. When diagonal occlusion is used, the power decrease percentage of module exceeds 80%, especially in the noon period when the percentage can reach 90%. The influence of different tilt angles on the output power of module with the same occlusion position is relatively weak, while that of occlusion on the output power of module is huge. The results of this study provide data support for the application of polysilicon photovoltaic module system.

Key words: occlusion effect, multi-mode, polysilicon module, output performance