I have to ask, what is the purpose of a Powerwall if it doesn't work during a power outage? Up here in the mountains we are prone to power outages from a few hours to possibly days after a heavy snow fall, so we have a propane powered generator that automatically kicks in and supplies the house. I always wondered how efficient it would be and would it run out of propane if we were seriously snowed in, well last year we had 2.5 days of no power and the generator only used 10 gallons of gas which was very comforting. My neighbors who have Solar and batteries ran out of power at the start of day two as the panels were covered in frozen snow and he didn't want to climb on the high roof to clear them.
