>However, one disadvantage of producing hydrogen is the losses during electrolysis. The overall efficiency in the “power to vehicle drive” energy chain is there

>However, one disadvantage of producing hydrogen is the losses during electrolysis. The overall efficiency in the “power to vehicle drive” energy chain is therefore only half the level of a BEV That seems to be more optimistic that what I've heard in the past. What's the efficiency of electrolysis+compression (or whatever step is necessary from bubbles to fuel in a tank)? Isn't that already well below 50%? How efficient are fuel cells in converting Hydrogen back to electricity? I thought I remembered that this too was a bit worse than batteries.