Using the electricity to break down the water could, in theory, generate more power than simple solar. With solar you are dependent upon batteries to store the electricity generated, with breaking down the water to it's basic components then using the hydrogen as the fuel source you can reduce the required number of batteries, thereby increasing the efficiency since the load the vehicle is carrying is not as heavy.Take that solar power example. Just drive the electric motors directly from the solar cells rather than break down water to use that energy instead as one will get less energy this way due to that extra step.
Imagine a small, super safe fusion reactor in every car (even in accidents) that only needs refueling every year or more. It would be a dream come true. We can but dream, sigh.Ideally... fusion power.
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