I keep a log of one of our tractors in the power range of a John Deere 6R and found there were only 20 days this year when it exceeded 4 hours per day. That means the electric concept Deere would have been available 80% of its working days. That doesn't make it marketable because on those 20 days I would have needed something to do the job but still there is merit. Our tractor used for feeding cattle through the winter spends much of its time with the block heater plugged in so plugged in to charge battery or plug in to warm the engine. There are very few, if any, days that tractor gets used more than 4 hours. So on a -20 degree morning would there no problem unplugging and driving away? Our JD6320 is not that reliable in the cold. Is the 4 hour day based on 100% power or at a certain load factor? Of course the significant factor is what will it cost? Others - battery technology conventional zinc-acid, nickel-metal hydride, or Lithium-ion? If the high power density of lithium-ion, are they built to handle the rough use of a tractor (are have a thin separator of a Galaxy Note 7 that can fail to do its job when handled a bit rough and burn). When I was in my teens International Harvester made the farm show rounds with their gas turbine tractor (last one I saw was in the Smithsonian) and Allis-Chalmers did the same with their quiet power fuel cell concept. Sixty years later we still are diesel powered.
