Re:Hydrogen vs. Battery Buses: A European Transit Reality Ch...
by marcosdumay on Saturday April 19, 2025 @12:04PM
(#43737303)
I don't think any hydrogen vehicle in actual use has a fuel cell (and if there's any, it's an incredibly rare exception). They are all internal combustion engines.
Proton exchange membranes are very unreliable and expensive. They are also not power-dense, one that powers a bus will be very large.
Re:Hydrogen vs. Battery Buses: A European Transit Reality Ch...
by ch_sm on Saturday April 19, 2025 @02:17PM
(#43738278)
It‘s actually the opposite: some hydrogen cars that use combustion exist, but they are really, really rare. Almost all hydrogen cars that are road legal use a fuel cell in combination with BEV parts to smooth out/extend power delivery.
Re:Hydrogen vs. Battery Buses: A European Transit Reality Ch...
by pipodeclown on Saturday April 19, 2025 @03:45PM
(#43738925)
That is completely incorrect, it is the opposite.
Re:Hydrogen vs. Battery Buses: A European Transit Reality Ch...
by fluidcruft on Saturday April 19, 2025 @09:24AM
(#43736224)
BEVs aren't 100% efficient though so it's closer to 2x rather than 3x.
Re:Hydrogen vs. Battery Buses: A European Transit Reality Ch...
by philjohn on Saturday April 19, 2025 @10:19AM
(#43736601)
I’ve also gone for the max efficiency figures for the Hydrogen car.
And that’s before we get to the fuel costs - £90 to go 400 miles in a Mirai, versus £5.50 to go 300 in an EV6.
I believe all Hydrogen vehicles are using proton exchange membranes still, which have roughly 40-50% efficiency.
And that's before you take into account that even the most cutting edge hydrogen refining processes are around 70% efficient.
So 1kWh of energy input (electricity) will net you 3X the motive power when used directly in a BEV than first being coverted to hydrogen, and then converted back into electricity.[1]
[1] 0.5*0.7 = 0.35.