Just be be fair, there is an update on these fuel cell trucks. According to the former Electrical engineer at a All Fuel Cell site, the original demo fuel cells worked quite well. All cells in reach, order picker, stand up counter-balanced and double walkies lasted over 8 hrs on a half charge. There was not enough pressure to fill tanks to capacity on test trucks as they were not set up for higher pressures.
The Company buying these cells were impressed, and agreed to proceed with a large purchase. But, they asked the manufacturer to increase the size of the Hydrogen tank, or there would be no deal. They thought " if the truck goes 8 hrs on half a charge, imagine how long it would last with a double tank"
Without testing it, the cells were re-configured with larger tanks. But, with only so much real-estate to produce a hydrogen cell, the "STACK" or heart of the system had to be smaller to accommodate the bigger tank. Turns out this cripples the system and eats gas even more to satisfy the extra load on the smaller Stack.
It's like putting a small V6 in a pick up truck, then making it work hard. Unable to keep up, the engine revs and strains, consuming more fuel.
It's a case of the customer imposing their will on the manufacturer without proper testing.
Fuel cells that were not modified with smaller stacks are performing as first tested, going 8 or more hours per charge.
Thought I should share info on why there were failures at this site....