The inverter uses transistor oscillation circuit to convert low-voltage DC into alternating current, and then rises to 220V through transformer. When choosing an inverter, you should choose it reasonably according to the capacity of electrical appliances and batteries. In order to make the inverter work normally, the power of the inverter should be about 1.5 times that of the electrical appliance. At the same time, we should pay attention to the selection of battery capacity, so that the current of the battery does not exceed 1 times of the battery capacity when the inverter works at full load. Otherwise the battery life will be short.