Step 10: Automatic Switching Circuit Design
When the device is inactive, your appliance will be connected to the wall outlet and powered by the grid as it normally would be. The only difference is that it is going through the relay. But when the device is activated, the inverter turns on and sends power to the normally open contacts and the coil. This switches the relay. The appliance is disconnected from the wall outlet and connected to the inverter. This is how the switching circuit will automatically switch to your renewable power source whenever it is available.