The flow battery concept is interesting. The company rep mentions in the video that each zcell has 10kWh of stored energy. I found a diagram on their website that has indicates a discharge rate of 100A @ 48v, or 4.8kW, can be drawn for 30 mins.
For a 25kW DCQC EV solution, for which you wanted to bump up the charging rate to 50kW and sustain that for a 1/2 hour EV charge cycle, one would need 6 ZCells. That would take up quite a bit of space and you'd only be able to charge one EV at a time. Seems better suited to micro-grid applications.
It will be interesting to see what happens with flywheel technology, as perhaps materials like graphene will make power densities for flywheels more compelling. Based on the research I did, it seems like the power density isn't quite there yet to make them very useful for DCQC applications. The awesome thing with flywheels is that they are ideal for delivering high energy output over short periods of time, which is what got me thinking about their use with DCQC applications in the first place.
It's fun batting this stuff around, learned a bunch of new info!
Canadian with a US 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Big grin, enjoying my first BEV