Solar AC power generation system is composed of solar panel, charge controller, inverter and battery. Solar DC power generation system does not include inverters. In order to make the solar power generation system can provide enough power for the load, it is necessary to choose the components reasonably according to the power of the electrical appliances. Take 100W output power for 6 hours a day as an example to introduce the calculation method:

1. First, we should calculate the watt-hours consumed per day (including the loss of the inverter) :

If the conversion efficiency of the inverter is 90%, when the output power is 100W, the actual output power should be 100W/90%=111W; If it is used for 5 hours a day, the power consumption is 111W*5 hours =555Wh.

2. Calculate solar panels:

The output power of the solar panel should be 555Wh/6h/70%=130W, based on the effective sunshine time of 6 hours per day, and considering the charging efficiency and the loss during charging. Of this, 70% is the actual power used by the solar panel during the charging process.