1) For Auto or Manual switching the input between Solar Panel and AC Power(grid or power generator)
2) For AC electric pump applications to add water level monitoring for the well and/or cistern.
If you are currently using a Tuhorse 4THSG series 750W to 2200W solar pump on solar panel, and you wish to use a AC 120V/240V power as back up during a raining day or to run the pump at night. Connect both power sources to this Auto Switch as shown in the photo. In a sunny day, the solar panel will supply the power to the pump's control box and the pump. When sun energy goes low, the power source will be switched over to the AC grid power automatically.
This device also add water level control to Tuhorse 4THSG series solar pump.