Lakesdigger
Member
I'm not gonna argue about efficiencies of hydrogen vs battery etc as such. But you mention getting hydrogen from electricity through to driving wheels not being anywhere near as efficient as using a battery. Don't forget you need the electric to charge the battery to begin with and thats where long term i see the issue with batteries. Where is all the leccy going to come from? This is why a clean break from fossil fuels is so difficult to achieve, let's be honest with all the technological advances over the last 100+ years we still can't quite do it and it's because of the flexibility and ease of use.Larger wheels take less power to drive, more torque, just select a better diff ratio. The rolling resistance of a small diameter tyre is greater than a large diameter.
Running on hydrogen, either fuel cell or combustion, is not difficult. Making green hydrogen, compressing it, storing it and holding it on a tank on the tractor is the problem. The CNH methane tractor can only store 4 hours worth of fuel, that is with tanks on the front linkage. Hydrogen is less dense, much more prone to leakage, and a real issue to keep in a tank at a high enough pressure to store a decent quantity of energy. Looking at hydrogen fuel cell cars, they fit hydrogen tanks everywhere they can find a hole.
Getting green hydrogen from electricity through to driving the wheels is about a third efficient as using a battery, so you need three times as much energy. Hydrogen might be a good stop gap, but new battery technologies being worked on at present (solid state for one) will make it obsolete in 10 - 15 years time.