[Tagbert]

Yes, I do understand the electrolysis process. I also understand that it is a very inefficient process that takes significantly more energy as input than is produced in the hydrogen output. That is also something that must not be ignored.

[_hypx]

I don't think you do. The theoretical efficiency limit is 100% efficiency, same as charging a lithium ion battery. Reality is closer to this than what is in your head I suspect.