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Very rough estimate based on forums...
The max rate I read was 19 gallons per hour. Many reported around 5 gallons per hour.
19 gallons x 7 lbs per gallong is 133 lbs per hour.
Given a reference to 0.5 lbs of fuel per horsepower hour, that works out to 266 horsepower.
That works out to roughly 200 kW (266 horsepower x 746 watts).
So a 400 kWh battery would give a combine in worst case useage 2hrs of runtime. Swap the pack out with the one that has been charging and you're good to go again.
Heck, you might even be able to get down to 200 kWh or so for about an hour of hard use. That's not too shabby. The only downtime would be the amount of time needed to swap packs.
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