[DonRotolo]

We generally go one size up (meaning #10 instead of #12) for all the recommendations, always for higher-current applications but sometimes for small stuff too.

#12 has a resistance of 0.00187 Ohms per foot. If I am using a total of six feet of it between the PDB and the motor (with a Jaguar in-between) - 3' of each color - I have 0.01122 Ohms.

We remember that V=I*R according to Ohm's Law.

If I am running 40 A to my motor, I am losing 40*0.01122 = 0.45 volts just from the wire.

Using #10 wire (0.00118 Ohms/foot) I lose .28 Volts, almost half.