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Electrolysis of water produces hydrogen and oxygen gases at different electrodes.
2H2O(l) --> 2H2(g) + O2(g)
Hydrogen is collected at the cathode.
Oxygen is collected at the anode.
Hydrogen has 134,500 Btu/kg.
It takes about 50 kWh of electricity to manufacture one kilogram of hydrogen. One kWh is equal to 3,412 BTUs, so it takes 170,600 Btu of electricity to make 134,500 Btu of hydrogen.
Or you get back about 78% of the energy back.
I suppose the 2 ordeals are capturing, compressing and storing the hydrogen gas. And then, adapting a vehicle to be able to run it.
But estimating this side of things is where I need help.
For compressing the fuel I'm guessing the right air compressor pump could be outfitted with wind blade power??