Wire sizing chart for 12 and 24 volt solar & wind systems

How the chart works:

1. On the left, locate the current ( array or load current ).
2. Move across to locate distance to be travelled.
3. Move up to locate the size of wire to be used.

Wire Sizing Chart 12 volt System

Maximum one way distance (feet) for 5% voltage loss in 12 volt systems.

Wire Size mm

Amps	2.5 mm	4 mm	6 mm	8 mm	16 mm	25 mm	35 mm	50 mm	60 mm	70 mm	85 mm	110
1	106	169	269	427	679	1080	1717	2166	2730	3444	4342	5475
2	53	85	134	214	340	540	859	1083	1365	1722	2171	2738
4	27	42	67	107	170	270	429	542	682	861	1086	1369
6	18	28	45	71	113	180	286	361	455	574	724	913
8	13	21	34	53	85	135	215	271	341	430	543	684
10	11	17	27	43	68	108	172	217	273	344	434	548
15	7	11	18	28	45	72	114	144	182	260	289	365
20	-	8	13	21	34	54	86	108	136	172	217	274
25	-	-	11	17	27	43	69	87	109	138	174	219
30	-	-	9	14	23	36	57	72	91	115	145	183
35	-	-	-	12	19	31	49	62	78	98	124	156
40	-	-	-	-	17	27	43	54	68	86	109	137
45	-	-	-	-	15	24	38	48	61	77	96	122
50	-	-	-	-	14	22	34	43	55	69	87	110

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Wire Sizing Chart 24 volt System

Maximum one way distance (feet) for 5% voltage loss in 24 volt systems.

Wire Size mm

Amps	2.5mm	4mm	6 mm	8 mm	16 mm	25 mm	35 mm	50 mm	60mm	70 mm	85 mm	110 mm
1	213	338	537	584	1359	2160	3434	4332	5460	6887	8684	10951
2	106	169	269	427	679	1080	1717	2166	2730	3444	4342	5475
4	53	85	134	214	340	540	859	1083	1365	1722	2171	2738
6	35	56	90	142	226	360	572	722	910	1148	1447	1825
8	27	42	67	107	170	270	429	542	682	861	1086	1369
10	21	34	54	85	136	216	343	433	546	689	868	1095
15	14	23	36	57	91

2.5 mm

4 mm

6 mm

8 mm

16 mm

25 mm

35 mm

50 mm

60 mm

70 mm

85 mm

110

2.5mm

4mm