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By the time combines go electric, they will have been full auto well before that. You'd have a controller in charge of 10 combines remotely monitoring operations, with the harvesters operating at 99% autonomous.
It matters less how long to recharge if the harvesters otherwise don't take breaks and work 24/7 around the clock. Then again, simply refueling and moving on to the next field makes it much more appealing to large operations.
Perhaps tractors are the correct operation to utilize quick swap batteries. Use one while the other charges.
Maybe then the battery would only need to be ~400 kWh, or large enough to handle whatever the continuous load is without being damaged.
What is the typical HP demands of a combine?
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