Table A.2: Voltage Drop Chart (12V Systems)

Maximum recommended wire lengths (feet) for <3% voltage drop (0.36V)

Current	18 AWG	16 AWG	14 AWG	12 AWG	10 AWG	8 AWG	4 AWG	2 AWG	0 AWG
5A	56 ft	89 ft	142 ft	226 ft	360 ft	571 ft	-	-	-
10A	28 ft	45 ft	71 ft	113 ft	180 ft	286 ft	457 ft	725 ft	-
20A	14 ft	22 ft	36 ft	57 ft	90 ft	143 ft	229 ft	363 ft	571 ft
30A	9 ft	15 ft	24 ft	38 ft	60 ft	95 ft	152 ft	242 ft	381 ft
50A	-	9 ft	14 ft	23 ft	36 ft	57 ft	91 ft	145 ft	229 ft
75A	-	-	9 ft	15 ft	24 ft	38 ft	61 ft	97 ft	152 ft
100A	-	-	-	11 ft	18 ft	29 ft	46 ft	73 ft	114 ft
150A	-	-	-	-	12 ft	19 ft	30 ft	48 ft	76 ft
200A	-	-	-	-	9 ft	14 ft	23 ft	36 ft	57 ft

Note: Values are round-trip distance (positive + negative wires). For one-way length, divide by 2.