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I’m sure 100 watts wouldn’t be anywhere near enough power to charge an ED battery, but it was awesome for trickle charging the 12v battery and running low wattage accessories without deprecating the battery.
It is if you are not in a hurry. The battery pack is 17.5 kilowatt hours so it would take about 100 hours to charge back up from a 40 percent SOC.
 

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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...
If you kept the power draw to only a refrigerator the air handler of a gas furnace, and minimal (LED) lighting, say an average of 400 watts, the Smart would keep them going for about 40 hours.
 
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