Wp = Wpeak Represents the peak power of the solar cell Daily with different angles of solar radiation, the power output is not the same. Wp of the maximum output power. Wp = Wpeak, indicates the peak power of the solar cell. Solar peak power Wp is under standard conditions: radiation intensity 1000W/m2, the atmospheric quality AM1.5, under the condition of a battery temperature 25 ° C, the solar cell output power. (This condition is about and we usually sunny day around noon sunlight conditions almost) according to the lighting conditions in the Guangdong area, converted into standard exposure time of about 3.3 to 3.5 hours. On rainy days, the solar cell can produce a certain amount of energy, its power is about 5-15% of the rated power.