Solar power generation system is divided into off-grid power generation system, grid-connected power generation system and distributed power generation system:

1. off-grid power generation system mainly consists of solar modules, controllers, batteries, such as the output power supply for the AC 220V or 110V, but also need to configure the inverter.

2. grid-connected power generation system is the solar module generated by the DC power through the grid inverter converted to meet the requirements of the utility grid AC power directly into the public power grid. Grid-connected power generation system has a centralised large-scale grid-connected power station is generally a national power station, the main feature is that the power generated by the direct transmission of energy to the grid, the grid unified deployment of power supply to the user. But this kind of power station investment, construction period is long, covers a large area, has not been too much development. And decentralised small-scale grid-connected power generation system, especially photovoltaic building integrated power generation system, due to the advantages of small investment, fast construction, small footprint, policy support, etc., is the mainstream of grid-connected power generation.