The Solarwatt Battery Flex system can be scaled between 4.8kWh and 240kWh. Image: Solarwatt German PV manufacturer Solarwatt has today (9 June) unveiled a new battery storage product developed in collaboration with BMW. The Solarwatt Battery Flex is a modular storage device, with the system able to expanded from 4.8KWh to 240kWh through the stacking of up to eight battery packs and creation of up to 10 clusters. It differs from previous Solarwatt storage offerings in that it is much smaller and easier to install, with CEO Detlef Neuhaus claiming in a press conference announcing the product that “no mistake can be made in installing this storage unit” because the device indicates if it’s correctly installed and there is therefore no chance to incorrectly install it.