Photovoltaic modules can also generate electricity under certain weak light, but due to continuous rain or haze weather, the solar radiation illuminance is low, and if the operating voltage of the photovoltaic system cannot reach the starting voltage of the inverter, the system will not The grid-connected power generation system and the power distribution network operate in parallel. When the photovoltaic system cannot meet the load demand and does not work, the electricity from the grid will be automatically supplemented, and there is no problem of insufficient power and power outages.