A mono solar system consists of a solar cell group, a solar controller, and a battery (group). Mono solar system is divided into off-grid power generation system and grid-connected power generation system: 1. Off-grid power generation system: It is mainly composed of solar cell components, controllers, and batteries. If the output power is AC 220V or 110V, an inverter is also required. 2. The grid-connected power generation system is that the direct current generated by the solar module is converted into alternating current that meets the requirements of the mains grid through the grid-connected inverter, and then directly connected to the public grid. The grid-connected power generation system has centralized large-scale grid-connected power stations, which are generally national-level power stations. However, this kind of power station has not developed much due to its large investment, long construction period and large area. The decentralized small grid-connected power generation system, especially the photovoltaic building-integrated power generation system, is the mainstream of grid-connected power generation due to its advantages of small investment, fast construction, small footprint, and strong policy support.