[Exeric]

Here is the calculations for 10 and 14 AWG:

10awg resistance = 120' x .001 ohm/foot = .12 ohms
current = .9 x 14 x 1.25 = 15.75 amps
Voltage drop = I x R = 15.75 amps x .12 ohms = 1.89 Volts < 2.4V

14awg resistance = 120' x .0025 ohm/foot = .3 ohms
current = .9 x 14 x 1.25 = 15.75 amps
Voltage drop = I x R = 15.75 amps x .3 ohms = 4.75V > 2.4V

Also, I could max out to 17 microconverters at a later date on that line and still be under 1 % voltage drop ,i.e. 2.4 volts. It looks like I need 20A double ganged circuit breakers.