You would get a more powerful set up with a golf car rear end if I'm not mistaken, that motor looks just slightly bigger then an Etek, and 300 amp controller is not that big for 72 volts, I would want to go with at least 600 amps as I see my 48 volt motor spike at over 600 amps to get the same power out of that 72 volt motor you would be drawing 400 amps and at times I wish that my EV had more power.
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