I used to have shares in an Italian company called ACTA, they produced self-charging fuel cell solutions, which used an electrolyser to produce the hydrogen. Was mainly aiming as a solution for recharging small-vehicle fuel cells (mopeds etc), but also very handy for mobile cell towers in...
Really interesting thread. I don't drive an EV but a friend has the Tesla, amazing piece of kit. It already meets his needs for real-world use 95% of the time, it's just longer journeys that he has to think about his route a bit. But given that every morning he gets in it there is a full tank...