Big Frog Mountain- Voltage Drop & Max Ampacity Charts- Solar Power

Voltage Drop & Max Ampacity Charts

Maximum distance in feet of various guage two conductor copper wire from power source to load for 2% voltage drop in a 12 volt system. Do not exceed the 2% drop for wire between PV modules and batteries. A 4 to 5% loss is acceptable between batteries and lighting circuits in most cases. All wiring should only be performed by a quaulified electrician or NABCEP certified installer and abide by the National Electrical Code.

2% Voltage Drop Chart
Amps	#14	#12	#10	#8	#6	#4	#2	#1/0	#2/0	#4/0
1	45	70	115	180	290	456	720	.	.	.
2	22.5	35	57.5	90	145	228	360	580	720	1060
4	10	17.5	27.5	45	72.5	114	180	290	360	580
6	7.5	12	17.5	30	47.5	75	120	193	243	380
8	5.5	8.5	11.5	22.5	35.5	57	90	145	180	290
10	4.5	7	11.5	18	28.5	45.5	72.5	115	145	230
15	3	4.5	7	12	19	30	48	76.5	96	150
20	2	3.5	5.5	9	14.5	22.5	36	57.5	72.5	116
25	1.8	2.8	4.5	7	11.5	18	29	46	58	92
30	1.5	2.4	3.5	6	9.5	15	24	38.5	48.5	77
40	.	.	2.8	4.5	7	11.5	18	29	36	56
50	.	.	2.3	3.6	5.5	9	14.5	23	29	46
100	.	.	.	.	2.9	4.6	7.2	11.5	14.5	23
150	.	.	.	.	.	.	4.8	7.7	9.7	15
200	.	.	.	.	.	.	3.6	5.8	7.3	11

Maximum Ampacity for Copper and Aluminum Wire
Wire Size	Copper	Aluminum
14	25	.
12	30	25
10	40	35
8	55	45
6	75	60
4	95	75
2	130	100
1	150	115
1/0	170	135
2/0	265	150
4/0	360	205

NEC allows rounding up cable ampacity to next standard fuse or breaker. Other factors will need consideration for proper conductor sizing including local codes and conditions.
Always consult with and use a qualified electrician for any electrical work.

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