Switch between Grid power and Solar power AND use grid backup
I have a 240V 40A circuit (pool heater on during the winter with large kWh draw + lower kWh draw circulator). The pool heater is only on in the winter and runs on the home power system. Originally this circuit was on the solar powered off-grid system but I changed the power source to the house due to the huge power draw 82 kWh a day.