Elon Musk is producing a whole home battery, the Powerwall. It will be produced in the 7 kWh and 10 kWh sizes. The 10 kWh size will retail for $3500 + some installation extras. Not bad. His vision is that it would be combined with solar panels to charge the battery. I think these would be good additions to homes with or without solar panels. If connected into the power grid to stay charged it could be used in place of a generator in times of power failure. It could also be charged during off-peak hours and used to supplement during peak hours.
Update 8/23/20 (5years later): Must have been a good idea because Generac is marketing their PWRcell for this purpose.
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