You're right BBS, but if the original source energy is solar, than, other than the panela the source is 'free'. So even if only 80% of the solar energy is converted, it is still a winning equation.
However, I suppose the issue comes down to an electric motor vs a hydrogen engine. Per 'unit' of solar generation, is it better to store this as power in a battery and then run motors, or is it better to convert to hydrogen and then use that in a hydrogen engine. A lot of factors in those equations.
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