There is; the dump controller can put extra charge into anything; a plain old resistive block heater would work as a dump load, even if it's set up for 120V.
Will it warm up the motor? Not even close to significantly, but every bit helps I guess.
I'm going to try to dump the extra juice in the summer to the car's fan; it will be interesting to see if it can start the fan without a capacitor and some extra circuitry.
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