This is a fascinating insight into the fundamental differences in business model and approach to energy storage from these two behind the meter heavyweights. Philipp Schroder of Sonnen gained many headlines from the quote "we don't want to sell fancy boxes to rich dentists." This focus though, great quote that it was, detracts from a short video that highlights the fundamentally different approaches to two very successful companies, operating in the same, or very similar markets. 

Perhaps it also gives an insight into the different thinking of an American and a European market approach. Though both are having successes in both markets. It's more the longer term approaches that I refer to. I'd really recommend taking the 36 minutes to hear what is said.