Simply put, an off-grid photovoltaic power station stores solar power in a battery and then converts it into a household 220V voltage (or the voltage available for refrigerators and air conditioners) through an inverter.

A grid-connected power station refers to a power station connected to the mains. A grid-connected photovoltaic power station does not have an energy storage device. It directly converts the voltage required by the national grid through an inverter and gives priority to household use. The unused electricity can be sold to the state. Grid connection depends on the policies of your country.