A home converted electric car

[MN C Van]

Oh, LoL - it doesn't work like that

Hydrogen is usually considered an energy carrier, like electricity, as it must be produced from a primary energy source such as solar energy, biomass, electricity (e.g. in the form of solar PV or via wind turbines), or hydrocarbons such as natural gas or coal.[2] Conventional hydrogen production using natural gas induces significant environmental impacts; as with the use of any hydrocarbon, carbon dioxide is emitted.[3]

That quote is out of context.  Try reading this, it is much more on point.

https://en.wikipedia.org/wiki/Hydrogen_vehicle

Says the same thing? Near exact

As of 2014, 95% of hydrogen is made from natural gas. It can be produced using renewable sources, but that is an expensive process.[3]
...
The drawbacks of hydrogen use are high carbon emissions intensity when produced from natural gas, capital cost burden, low energy content per unit volume, production and compression of hydrogen, and the large investment in infrastructure that would be required to fuel vehicles.[5][6][7]

Hydrogen does not come as a pre-existing source of energy like fossil fuels but is first produced and then stored as a carrier,[66] much like a battery.

And a sampling of  more discouraging details

Hydrogen fuel cells are relatively expensive to produce, as their designs require rare substances such as platinum as a catalyst,[56] In 2014, Toyota said it would introduce its Toyota Mirai in Japan for less than $70,000 in 2015.[12][57] Former European Parliament President Pat Cox estimates that Toyota will initially lose about $100,000 on each Mirai sold.[13][url=https://en.wikipedia.org/wiki/Hydrogen_vehicle#cite_note-Cost2014-13][/url]

Not to be contrarian, there's nothing in the link that shows this to be a practical fuel for widespread use at anytime in the future