The grid-connected solar power generation system converts solar energy into electric energy without storing energy into the battery, and directly sends the electric energy to the grid through the grid-tied inverter. The characteristics of electricity consumption in these places are mainly: large electricity consumption, long daily electricity consuming time, high voltage (mainly three-phase voltage), and high annual electricity bills. Through the solar grid-connected power generation system, most of the city power use can be saved every year, and the electricity bill is greatly reduced.