H2 is a terrible substance; it destroys whatever you use to store it, it leaks like crazy, you need to compress and chill it to get any kind of density, you need to store it at crazy low temperatures.
For instance, the toyota Mirai's tank has a finite lifetime of 15 years from when it was made before it has to be replaced.
A good setup might be a nuke plant with a couple huge batteries along side, mixed with some grid PV and wind, and per-home battery, smart hot water heaters, and local PV.
H2 is just a silly fuel and a silly battery. Except on rockets where it's still silly but not quite as silly.
That's why you'd usually want to only use the H2 as an intermediate step on the way to some other e-fuel. Which can be as simple as iron powder to be oxidized at the application site. But the first step, in all e-fuel processes, is always the hydrolyser. Coupled with with local H2 storage so that at least the downstream processes can operate closer to 24/7 than the hydrolyser. Batteries don't scale to seasonal, fuels created downstream of a hydrolyser do. The trick is to build the hydrolysers (and downstream processors) at sites where that H2 buffer is easily created. Salt caverns are the usual candidate.
(yes, this is a little off topic under an article about an H2 excavator. But if they solve all those problems, I'll applaude them, because at one point we'll either have green H2 available or we'll cease to be an industrial society, of they don't, well it's their problem they tried, not mine)
For instance, the toyota Mirai's tank has a finite lifetime of 15 years from when it was made before it has to be replaced.
A good setup might be a nuke plant with a couple huge batteries along side, mixed with some grid PV and wind, and per-home battery, smart hot water heaters, and local PV.
H2 is just a silly fuel and a silly battery. Except on rockets where it's still silly but not quite as silly.