The formula for cell conversion efficiency: efficiency = peak power/power of incident light
Wp=Wpeak, which represents the peak power of the solar cell. As the solar irradiation varies every day, the output power of the solar cell also varies, Wp represents the maximum output power. Peak solar power Wp is the output power of the solar cell under standard conditions: radiation intensity 1000 W/m2, air quality AM1.5 and battery temperature 25°C. (These conditions are about the same as our usual sunshine conditions around noon on a sunny day.) According to the lighting conditions in Guangdong, the standard lighting duration is about 3.3 to 3.5 hours. On rainy days, solar cells can also produce a certain amount of power, and their power is about 5-15% of the rated power.
The power iIncident refers to the effective power ultimately absorbed by the solar panel and the reflected power that is not absorbed.