#2 AWG: 1.54 ohms/1000 ft → R = 0.46 ohms → VD = 9.2V (7.7%) – getting close.
: 120V single-phase, 20A load, 150 ft one-way, copper, target VD <3% (3.6V). electrical cable size
[ R = \rho \fracLA ]
#1/0 AWG: 0.98 ohms/1000 ft → R = 0.29 ohms → VD = 5.8V (4.8%) – acceptable. #2 AWG: 1