I think you misunderstand the economic choice that smaller farms are making. When you can get a 50 year old workhorse tractor for 20k that you can actually maintain yourself, it makes far more sense than any 200k+ tractor whether diesel or electric. Additionally folks are used to diesel, they’ve already got a big tank on the property that they refill every few months, and they might not have sufficient electrical connection to get several of the giant swapable battery packs for their tractors and keep one on the charge while they work.

If farmers were starting from scratch, sure it might make sense to go all solar and all electric, but these are folks who are constantly squeezed for cash, constantly relying on crop insurance and well-timed loans and subsidies to stay afloat living on 200 year old farms that have been in the family since the land was stolen from the native Americans, and probably still using the equipment dad bought in the 60s and 70s because that’s the most financially viable option.