Germany headquartered “intelligent battery storage” and energy services provider Sonnen has just obtained US$85 million in its fourth financing round, from a range of investors. The company said the funds would be used both home and abroad, with Sonnen operating in markets including Italy, Australia, the US and the UK. Andy Colthorpe spoke with the company’s CEO Christoph Ostermann to learn more.

Trina Best, the energy storage company begun as part of Trina Solar but now a separate entity in its own right, wants to go public by 2020 and has not ruled out building its own battery cell production facilities in future.