Tesla is offering a consumer battery, called the Powerwall, priced starting at $3,500, and derived from the batteries the car company uses in its Model S vehicles.
So when it is nighttime, or cloudy, your solar panels are not doing anything. When becalmed, your wind powered generator is idle. With a battery to store the energy produced during peak times, your home will be free of the grid more often. The device, which Tesla will start producing later this year, will be installed by licensed technicians
Read more... TreeHugger
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