I do think about how expensive and unbuildable on scale fuel-cells are, not counting it's slow ability to change output power that demand batteries in the middl

I do think about how expensive and unbuildable on scale fuel-cells are, not counting it's slow ability to change output power that demand batteries in the middle for most usages. Beside that we need way too much energy for hydrolysis. Yes you can make something that work, like you can in most part of inhabited world build autonomous homes with giant batteries and p.v., but it's so expensive and can't be done for all at a point we can call it a myth. I have a domestic p.v. + small storage + a limited V2L ability from my BEV to power the main battery inverter just to have a really expensive UPS that last enough to pay back a bit, and well... That's just enough for emergency (car usage, limited to 3kW maximum) or sunny day-to-sunny day autonomy without heating when there is no sunshine. I feel the costs and the limits on the most mature and available tech without to dream monsters like Toyota Mirai. An old discussion: https://www.reddit.com/r/AskEngineers/comments/wrv59o/comment/ikvc3gm/?utm_source=share&utm_medium=web2x&context=3 https://www.reddit.com/r/AskEngineers/comments/wrv59o/commen...