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The point is if you have electricity then converting to hydrogen, compressing transporting and turning back into electricity in a fuel cell is much less efficie
by SigmundA 5y ago
The point is if you have electricity then converting to hydrogen, compressing transporting and turning back into electricity in a fuel cell is much less efficient than just charging a battery.
Why would you do that? You could argue energy density, but looking at current fuel cell vehicles like the Mirai shows the have only a slim advantage in range dues to the weight of the fuel cells, high pressure tanks and tractions batteries and extra structure to protect the tanks.
- xorcist 5y agoEnergy density is indeed it. Not much to argue about, it carries several times more energy per weight than any battery, and is several times cheaper too. The Mirai is a proof of concept, not a typical use case.
- SigmundA 5y agoWhen counting storage tanks, fuel cells, buffer batteries and protective structures no hydrogen doesn't really seem to have density advantage. The electrons in the battery are very light and energy dense but the battery to hold them and return them as useful current is not, same for hydrogen. What hydrogen fuel cell car is not a proof of concept?