I can tell you this project is doomed from the start. You've already chosen to make it extremely over complicated. In addition to the fuel cell you will also need a compact high-power lithium battery pack anyway, as a fuel cell can't put out the amperage to drive a car like that. And the high power charging equipment for fuel cell -> battery. Plus for the cost of a 5KW fuel cell sans tanks or any other hardware, you could literally buy 100 KWh of lithium batteries. And if you're generating the hydrogen at home, why would you use 50% efficient hydrogen generation and then 50% efficient hydrogen usage in the cell to replace a plain BEV that would literally triple the efficiency you're going to get from that round trip? Or buy hydrogen at a commercial refueling station for $16 per gallon gasoline equivalent?
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