Yes, you can use a battery to firewall off your solar from the utility and still have grid power as needed. First arrange your breakers so that all load comes

Yes, you can use a battery to firewall off your solar from the utility and still have grid power as needed. First arrange your breakers so that all load comes from your battery powered inverter. Second, charge the batteries with your solar. Third, charge the batteries with a grid connected charger at off peak times or as needed. You will lose a few percent in the power conversions. Also affordability is left as an exercise to the reader.