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Originally Posted by scott_gunn
Efficiency matters because you can store *more* free energy in a traditional battery than you can store as hydrogen. It wouldn't matter if we were making more than enough free energy to do everything we wanted, but we're not even close to that point, so efficiency does matter.
Hypothetical example: Would you want a solar powered electrolysis plant, that costs $1,000,000 per year to operate, to provide enough hydrogen for 10,000 cars/year, or the same solar powered plant charging enough batteries for 20,000 cars/year?
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I'm thinking about the example given in the article by Honda:
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We have recently produced a solar powered hydrogen refining unit without a compressor that’s 25 per cent more efficient than previous units. Ideal for home use, so you won't need to buy hydrogen elsewhere.
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So think about it on that level. when you consider this possibility, no, efficiency doesn't enter into the picture, the only question you should ask yourself: can you generate energy at the same rate, or quicker than you can use it?