Off grid photovoltaic power generation system is suitable for areas without grid connection or unstable grid connected power. Off grid photovoltaic system usually consists of solar panel, solar controller, Off grid hybrid inverter, battery pack and support system. They generate DC power which can be directly stored in the battery during the day or in the battery pack, which is used to provide power at night or on cloudy or rainy days. Most inverters can also support the municipal power input as supplementary energy to supply power to the load.