The Critic
Thread starter
10 AWG:Your compressor, like any appliance designed for nominal 120V, will operate correctly down to at least 110V.
12 AWG is fine:
Voltage drop: 2.38
Voltage drop percentage: 1.99%
Voltage at the end: 117.62
Even 14 AWG would be OK:
Voltage drop: 3.79
Voltage drop percentage: 3.16%
Voltage at the end: 116.21
I used the calculator here with the "estimated resistance" tab and used 15A as the load current, and 50 feet as the distance.
https://www.calculator.net/voltage-drop-calculator.html
Voltage drop: 1.50
Voltage drop percentage: 1.25%
Voltage at the end: 118.5
Looks like a minimal improvement.