The numbers show for instance that 300 watts is about what many people use for cycling...on flat ground, no wind, no load.
Then note that hills make a big difference. I know a guy with a 24 volt system that is stopped on hills way before I am.
Bottom line, a flat city situation with low-moderate winds and a 24 volt pack with a 22 amp controller should push you along fine assuming a 500 Watt motor. If you need acceleration up the controller to 30 amps and a 750 Watt motor.
In the mountains, go 36 Volt minimum. I'm using a 22 Amp / 36 Volt combo and on a 20% grade need a bit more.
finally, check the manufacturers spec for the recommended weight the motor can move.
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