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Old Sep 05, 2001, 05:50 AM
rcastab is offline
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What AWG is typically use for 40 amp max?

What size gauge is use for high current application, 40 amps max?
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Old Sep 05, 2001, 06:37 PM
bhchan is offline
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Electric Airplane Junkie
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For 40 amp, you can use 14-16 ga.

Old Sep 05, 2001, 08:36 PM
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I just use 12 gauge for everything, it fits nicely(just!) in sermos connectors, its probably a bit of overkill for my use 0-20A but it isn't expensive.
Old Sep 06, 2001, 01:42 AM
Ed Lyerly is offline
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12 or 13. I think the 13 fits the Sermos connectors best.
Old Sep 06, 2001, 11:37 AM
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16 gauge wire is too small for 40 amps! I'd go with 12 gauge but 14 gauge would be okay. Here's the resistances in milliohms per foot:

12ga - 1.6
13ga - 2.0
14ga - 2.5
15ga - 3.2
16ga - 4.0

If you have a three inch lead from the battery to the ESC and three inches from the ESC to the motor you have a total of a foot of wire. A foot of 16ga will drop .16 volts at 40 amps but more importantly will dissipate 6.4 watts, that's enough to heat the wiring.

12ga would be .064V and 2.6W, 14ga would be .1V and 4W. The 12ga would weigh .32oz and the 16ga, .12oz.

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