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Old 12-22-2011, 03:39 PM
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The controller in those pictures was only a 400 amp rated for 1 minute. Unlike gas and diesel engines, electric motors are capable of a huge peak output for 5 seconds. The Etek PMDC motor I'm using is only rated at 5 hp continuous, 15 hp for 1 minute, and for 5 seconds, what ever your controller and battery can muster. Since the AGM batteries can crank at 680 amps for 10 seconds, it was time to upgrade to a 700 amp controller. I'm still at 48 volts, but could push to 72 volts. At 48 volts X 700 amps = 33,600 watts / 746 = 45 hp for 5 seconds. You have to remember that on an electric motor, all torque is available at zero rpm, that is why even with a thorough pre-flight, everyone that tried to ride it lost control. At 72 volts (if I upgrade) it would be 72 X 700 = 50,400 watts / 746 = 67.5 hp on a scooter that weighs 113 lbs.
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