A friend of a friend who is a very clever engineer is working with Siemens apparently developing a hydrogen system to charge vehicle batteries without electric cars having to charge from the national grid
I’ve been told it’s quite developed
That would be a fuel cell -
https://en.wikipedia.org/wiki/Fuel_cell - I expect...
Basically they are used in "hydrogen cars" today. But you could put them anywhere you have a source of hydrogen (think a local solar power station that converts excess electric into hydrogen instead of expensive batteries, or a service station that needs short bursts of high power to charge cars...). No idea what the economics of fuel cells are though...
