The system has three operation modes, namely pure electric mode and pure oil mode. The pure electricity mode refers to the battery driven motor. The pure oil mode refers to the direct drive motor of the generator, the generator is controlled by the controller. When the voltage is lower than a specified set value, the controller can directly control the generator starting and drive the motor by the generator. This can effectively protect the over discharge of the battery. You can also set up manual start, and you can switch the pure oil and pure electricity mode freely.