How run fridge or water pump on samal sollar system{ups or inverter} without overload the system

in this video i made a circuit to run the refrigrator or water pump on small solar system or inverter smothely without dsistrubing the inverter overload . This circuit srart the load on main supply and after 10 second shift to solar without tripping and any missing of supply. Be care full about relay should be heavy duty and polarity should in sequence

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