1. First, calculate the number of watt hours consumed each day (including the loss of the inverter): If the conversion efficiency of the inverter is 90%, then when the output power is 100W, the actual output power required should be 100W/90%=111W.
If used 6 hours a day, the power consumption is 111 W*6 hours = 666 Wh.
2. Calculate the solar panel: Based on the effective daily sunshine duration of 6 hours and considering the charging efficiency and loss during the charging process, the output power of the solar panel should be 666Wh/6h/70%=158.7W.
Of which 70% corresponds to the actual power used by the solar panel during the charging process.