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Mercedes Offers Home Battery

Mercedes-Benz has unveiled a personal energy cell that, like Tesla's Powerwall, uses giant batteries to store surplus power from your home's solar panels and keep you off the conventional energy grid. Each pack only holds 2.5kWh of electricity, but you can combine up to eight of them to hold 20kWh, or twice as much as a Powerwall. http://goo.gl/fyxNHf #tech

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