The general concept exists, except the batteries used are huge. See Tesla solar and PowerWall.
Ford has a different but novel idea as well with the upcoming F-150 Lightning. While the truck is plugged in it can act as power source for your house in a power outage.
A small battery may not get you through the night if you're considering power independence, meaning not connecting to public utility electricity. You may also have excess energy that you'll need/want to shunt somewhere if the solar is producing more than what the house and batteries use...
Ford has a different but novel idea as well with the upcoming F-150 Lightning. While the truck is plugged in it can act as power source for your house in a power outage.
A small battery may not get you through the night if you're considering power independence, meaning not connecting to public utility electricity. You may also have excess energy that you'll need/want to shunt somewhere if the solar is producing more than what the house and batteries use...