Flow Batteries in Miniature

I am looking into possible applications for flow batteries as a reserve power source on a reduced scale, say 20w peak at28-30 volts sustainable for approx. 100 hrs. I can find little information on characteristics such as sizing, current , plate densities and yada, yada. Does anyone have this data handy or know where it can be located? To date I find plenty of references but no actual specs. I also need to determine things such as output curves for such things like flow rates,static and dynamic.