Solar power system is divided into Off-grid power generation system, on-grid power generation system and distributed generation system:
1, off-grid power generation system is mainly composed of solar module components, controllers, batteries, such as output power for AC 220V or 110V, but also need to configure inverter.
2, the grid-connected power generation system is the solar module generated by DC power through the grid-connected inverter converted to meet the requirements of the electricity grid AC power after direct access to the public grid. Grid-connected power generation system has centralized large-scale grid-connected power stations are generally state-level power stations, the main feature is the power generation can be directly transported to the grid, from the power grid unified deployment to the user power. But this kind of power station invests big, the construction cycle is long, occupies the area big, still not too big development. and decentralized small-scale grid-connected power generation system, especially photovoltaic building integrated power generation system, due to small investment, fast construction, small footprint, large-scale policy support and other advantages, is the mainstream of grid-connected power generation.
3, distributed power generation system, also known as decentralized power generation or distributed energy supply, refers to the user on-site or near the use of small-scale photovoltaic power supply system to meet the needs of specific users, to support the existing distribution network economic operation, or meet both requirements.
The basic equipments of the distributed photovoltaic system include PV module, PV array bracket, DC confluence box, DC power distribution cabinet, grid-connected inverter, AC distribution cabinet and other equipments, as well as power supply monitoring device and environmental monitoring device. The mode of operation is in the condition of solar radiation, photovoltaic power system solar module array will convert the solar energy output, through the DC confluence box into the DC power distribution cabinet, from the grid-connected inverter into an alternating current supply building itself load, surplus or insufficient power through the connection grid to adjust.