Someday we could all have a home battery

Amidst the grid-climbing robots, smart thermostats, and electric cars at the smart grid conference DistribuTECH in San Antonio, Texas this week, battery makers were touting their low-cost batteries as energy storage for the grid, for buildings, and some day, homes. It's not so unfeasible that in the future many homes could have their very own battery, likely to be combined with a rooftop solar panel. In Panasonic's booth - the company bought controlling interest in Sanyo back in 2009 - a battery box was featured. The box strings together hundreds of small format lithium-ion laptop batteries in much the way Tesla for its electric car battery. (Note: Tesla also uses Panasonic laptop batteries.) A couple of battery stacks would be enough for a single family home, combined with an inverter already retailing in Germany (one of the largest rooftop solar markets) for less than $5,000. A few years ago there were reports this battery could store a week's worth of electricity.

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