Its principle is simple. It uses solar energy to drive the wheels of the windmill to generate electricity. The principle of this device is that solar energy will be captured by solar panels and then converted into electrical energy. There are many small solar cells on the solar panel, which will convert solar energy into direct current energy. Then, this kind of electric energy will be received by the controller and modulated into AC electric energy by the controller. Finally, alternating current will be sent to the motor, which will drive the wheels of the windmill to rotate, thus generating electricity.