Sonnenbatterie has rolled out its plug-and-play home battery system in the U.S. ahead of Christmas, beating Tesla to the punch in what is expected to be a competitive market in 2016. Sonnenbatterie manufacturers its storage devices in San Jose, California, and has secured supply contracts with 30 dealers across the U.S. Demand for the battery is already strong, with a Sonnenbatterie spokesperson telling PV Magazine’s German-language website that around 1,000 products have already been ordered.