Flow batteries + local (home battery) storage? Flow batteries get you a big bang for your buck; and many EV owners either already have or plan to acquire Tesla Powerwall-type battery backup units. I have an EV (VW e-Golf) and will get a Powerwall with my next EV (Model 3). That way, if the grid electricity goes out, I'm covered for house and car, at least for a while. Tesla is marketing solutions that comprise EV, home battery storage, and rooftop solar to charge them: trees loom over my home, so I have to purchase electrons from the NJ ACUA wind farm instead.