Off-grid solar power generation system includes a solar controller (wind and solar PV controller and the controller) to be issued by the power regulation and control, on the one hand the adjustment of energy sent to the DC load or AC load, on the other hand sent the extra battery energy storage, electricity can not be issued when the load required to meet the solar energy battery controller again sent to the load. Battery is fully charged, the controller to control the battery is not overcharging. When the energy stored in the battery discharge end, the solar controller to control the battery is not over discharge, protect the battery. Poor performance of the controller when a great impact on battery life, and ultimately affect system reliability. 2, the task of solar batteries for energy storage, so at night or on rainy days to ensure the load of electricity. 3, solar inverter is responsible for the direct current into alternating current for the exchange of load to use. Photovoltaic solar inverter is a core component of the wind power generation system. The use of relatively backward regions, remote and difficult to maintain, solar wind power system to improve the overall performance and ensure long-term stable operation of power stations, the reliability of the inverter high demands. In addition, as the high cost of new energy power generation, solar power and efficient operation of the inverter is also very important.