The web site stinks and has about nothing. If you look up the firm it appears to also be about nothing - at best a vechicle to partner up with to gain other partners. It appears that Powersav is ZBB's partner in a venture with AnHui XinLong Electrical Company (WinLong Electrical) and WuHu Huarui Power Transmission & Transformation Engineering COmpany (WuHu Huarui).
If you Google "PowerSav Inc. Invests in Joint Venture Company to Enter China's Energy Storage Market" you might find a good article from August 11, 2011.
Now is about the time I again wish the guy with a cloud over his head dd not chase away the guy who had experience running a electrical business in China. What a dope. Blew off an expert.