The Powerwall home battery will be able to charge itself up by either collecting solar energy or bringing it from the power grid at less expensive time. It will then be able to give that back to houses when they need it, including if the power goes out.
The company makes two versions of the battery, a 7kWh one intended for people using solar power and a 10kWh one that is intended to be a substitute for the electric grid if power goes down. The smaller one costs $3000 (£1950) before installation costs, and they will become available in late summer.
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