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(562) 423-4879
101 Wire Loss Chart
Please use this wiring loss chart as a guide to determine
the wire or cable size your system will need.



 The following Wire Loss Tables are courtesy of AEE Solar.

Wire Loss Tables - 12 volt and 24 volt d.c.

Use these tables to determine the maximum distance one-way in feet of various gauges of two-conductor copper wire
from power source to load for a 2% drop in 12 volt and 24 volt system wiring.
You can go twice the distance where a 4% loss is acceptable. Do not exceed the 2% drop for wire between PV modules
and batteries. A 4% to 5% loss is usually acceptable between batteries and lighting circuits in most cases.
Note that if you change an array from 12 volts to 24 volts and the wattage remains the same, then the current is cut
in half. This allows you to go 2 times as far with the same wire gauge with the 24 volt array as you could with the
12 volt array.  

                                                                              12 volt system - 2% voltage drop

Amps
14 ga.
12 ga.
10 ga.
8 ga.
6 ga.
4 ga.
2 ga.
1/0 ga.
2/0 ga.
4/0 ga.
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
15
22.5
35.5
57
90
145
180
290
10
4.5
7
12
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
3.6
5.5
9
14.5
23
29
46
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



                                                                            24 volt system - 2% voltage drop


Amps
14 ga.
12 ga.
10 ga.
8 ga.
6 ga.
4 ga.
2 ga.
1/0 ga.
2/0 ga.
4/0 ga.
1
90
140
230
360
580
912
1440
2
45
70
115
180
290
456
720
1160
1440
2120
4
20
35
55
90
145
228
360
580
720
1160
6
15
24
35
60
95
150
240
386
486
760
8
11
17
30
45
71
114
180
290
360
580
10
9
14
24
36
57
91
145
230
290
460
15
6
9
14
24
38
60
96
153
192
300
20
4
7
11
18
29
45
72
115
145
232
25
3.6
5.6
9
14
23
36
58
92
116
184
30
3
4.8
7
12
19
30
48
77
97
154
40
5.6
9
14
23
36
58
72
112
50
4.6
7.2
11
18
29
46
58
92
100
5.8
9.2
14.4
23
29
46
150
9.6
15.4
19.4
30
200
7.2
11.6
14.6
22



Wire Loss Tables - 48 volt and 120 volt d.c.

Use these tables to determine the maximum distance one-way in feet of various gauges of two-conductor copper wire
from power source to load for a 2% drop in 48 volt and 120 volt system wiring.
You can go twice the distance where a 4% loss is acceptable. Do not exceed the 2% drop for wire between PV modules
and batteries. A 4% to 5% loss is usually acceptable between batteries and lighting circuits in most cases.


                                                                            48 volt system - 2% voltage drop

Amps
14 ga.
12 ga.
10 ga.
8 ga.
6 ga.
4 ga.
2 ga.
1/0 ga.
2/0 ga.
4/0 ga.
1
180
280
460
720
1160
1824
2880
2
90
140
230
360
580
912
1440
2320
2880
4240
4
40
70
110
180
290
456
720
1160
1440
2320
6
30
48
70
120
190
300
480
772
972
1520
8
22
34
60
90
142
228
360
580
720
1160
10
18
28
48
72
114
182
290
460
580
920
15
12
18
28
48
76
120
192
306
384
600
20
8
14
22
36
58
90
144
230
290
464
25
7.2
11.2
18
28
46
72
116
184
232
368
30
6
9.6
14
24
38
60
96
154
194
308
40
11.2
18
28
46
72
116
144
224
50
9.2
14.4
22
36
58
92
116
184
100
11.6
18.4
28.8
46
58
92
150
19.2
30.8
38.8
60
200
14.4
23.2
29.2
44



                                                      120 volt system - 2% voltage drop

Amps
14 ga.
12 ga.
10 ga.
8 ga.
6 ga.
4 ga.
2 ga.
1/0 ga.
2/0 ga.
4/0 ga.
1
450
700
1150
1800
2900
4560
7200
2
225
350
575
900
1450
2280
3600
5800
7200
10600
4
100
175
275
450
725
1140
1800
2900
3600
5800
6
75
120
175
300
475
750
1200
1930
2430
3800
8
55
85
150
225
355
570
900
1450
1800
2900
10
45
70
120
180
285
455
725
1150
1450
2300
15
30
45
70
120
190
300
480
765
960
1500
20
20
35
55
90
145
225
360
575
725
1160
25
18
28
45
70
115
180
290
460
580
920
30
15
24
35
60
95
150
240
385
485
770
40
28
45
70
115
180
290
360
560
50
23
36
55
90
145
230
290
460
100
18
29
46
72
115
145
230
150
48
77
97
150
200
36
58
73
110