Sonnen’s energy storage systems and solar panels will be fitted at a new high-efficiency housing development in Arizona – built with Mandalay Homes, consisting of 2,900 houses, and becoming one of the largest planned Virtual Power Plants (VPP) in the world. It’s a big win for Sonnen, which is looking to expand in the US, from its German roots. A deployment on this scale is significant given the size of the residential battery market in the US. The project should also demonstrate the popularity of the battery storage with consumers, and enable those homeowners to generate revenue by selling their spare battery capacity back to the utility – although a deal with a utility is not currently in place, and…