A shot in the dark...but SMA Solar might become an interesting company to watch.

Recent news release indicating they may be competing with Powerwall?

http://www.reuters.com/article/sma-solar-tesla-batteries-idUSFWN152016

SMA Solar is based out of Germany but I cannot find their battery supplier...Could Litarion have some relationship with them?

Have many US distributors so could one of them be the $16M customer?

http://www.sma-america.com/company/about-sma.html

http://www.sma-america.com/where-to-buy.html