Zach its here, check out the UPS solutions at https://www.plugpower.com/

There are also lots of practical hardware on alibaba.

The reason it doesn't seem very well known, is the usual, profit driven business does not seem to know how to deal with it, the implications on capitalism are huge, understanding it helps us understand the current inflation of money, and where it will lead.

The capitalists think it will be somewhere very bad, because the advantage of capital is ending, but it is the beginning of something much better; Energyism!