Please let me know if you have any further questions.
Since the length of the wire significantly affects its power rating we now have an online Wire Gauge Calculator which can calculate a wire's power rating using the following parameters: Acceptable Power Loss, DC Volts, Amps, and Length of Wire
I'm not sure how to chose what gauge of wire I need. I'm wiring two 12 V batteries in series with a 24 V 450 W motor, and a controller, and a throttle. So if I'm looking at having 450 W at 24 V that would be 18.75 A of current so that means I need 9 gauge wire since it has a max power transmission of 19 A, or should i go up to 8 to be safe? Do I need the same gauge wire for connecting the controller to the throttle and the brake lever and what not? can someone explain how I should decide this?