10KW is just a guess.
I have 800 lbs worth of [poor] batteries. Reducing this weight by half or even a third will not make much of a noticeable difference in energy required to move me along. Remember that energy required to move a car is mostly altered by rolling resistance and aerodynamics changes and less so by weight (if driven properly). And going with a controller that can do regen braking would make weight saving even less beneficial.
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