I wrote:
> They would install a gas powered backup generator that turns on > automatically. This costs about $3000 for a small 11 kW unit (2.5 years of > $100 payments to the power company). > Note that in this scenario they have a Tesla Powerwall, so they do not need a generator capable of peak demand. A generator large enough for average demand will do, with the Powerwall for load leveling. I assume the Powerwall will have sophisticated diagnostics and warnings, so if storage and generation are low it will warn you not to run the washing machine. - Jed
