Abstract: As photovoltaic power generation technology advances, it becomes crucial to investigate the key factors affecting the output performance of bifacial photovoltaic modules and their performance strengthening strategies. Based on monocrystalline silicon module, a bifacial photovoltaic module power generation and testing system was designed and built in this study. The influence of different reflective spacing （e.g. 0 cm, 5 cm, 10 cm, 15 cm） on the output voltage, current, power and power gain of the system was studied at angles of 0°, 15°, 25°, 30°, 45° and 60°. The optimization effect of reflection enhancement strategy on the output performance of the system was comparatively studied. The results showed that with the increase of inclination angle, the output power of module first increased and then decreased. The highest output power of 164.1 W was achieved at an inclination angle of 30°. The use of reflective devices to enhance the solar radiation on the back of bifacial modules can effectively improve the overall system output power and maintaining proper spacing between reflective devices and modules can effectively increase the system power gain. When the inclination angle was maintained at 30° and the reflective spacing at 5 cm, the best system output power of 176.9 W could be obtained with a power gain of 7.8%. However, as reflective spacing increases further, the system output power displayed a slow decline. The results obtained in this study can provide guidance and reference for the optimization and improvement of the output performance of bifacial photovoltaic modules.

Key words: solar energy, bifacial photovoltaic module, inclination angle, reflective spacing, output performance