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10 gauge should be fine, pedal assist will reduce the current draw in any case. Current is proportional to torque for a motor
If you increase the voltage to the motor, it will not decrease the current. It will go up by approximately in proportion. The power rating is a nominal type rating. IF it is producing 320W at 12v (12x26 amps) it will produce around 720w (18X40amps) at 18 volts. THis is for the full throttle condition as Im sure there is some sort of throttle voltage control. 720W is of course over the power rating of the motor which is why it could release its magic smoke if ran at full load continuously
It is common to reduce current by increasing voltage but this requires a different motor or a lower gear to reduce torque load.
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84 930
18 Cayman GTS
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