Before grid-tied solar, many people bought a battery along with a solar system to keep the lights on during cloudy days. Once solar connected to the grid, that expensive component went by the wayside, but now it could be returning.
Both SolarCity and Panasonic are developing small batteries for homes or small businesses to guard against power outages, either from intermittency issues, as in Germany, or to protect against natural disasters in the US.
via SolarCity, Panasonic Both Working on Home Energy Storage Solutions – Solar Feeds News.
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