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Wire Sizing Calculator
Solar Systems Wire Sizing Calculator
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Cable wire size needed in mm2/cross sectional area/
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The cable should withstand maxumum current in A
Always choose cable type that satisfied both conditions: calculated wire diameter in inches (or cable wire size in mm2) and rated maximum ampers for power transmission if cables are wired in a bundle or maximum amps for chassis wiring if each wire is routed separately and exposed directly to air as per table below or manufacturers data. If calculated wire diameter has lower ampers current rating choose cable with higher wire diameter which covers corresponding amp rating.
Failure to do so may lead to fire hazard and cable's evaporating under system's current!
AWG gauge
Conductor
diameter Inches
Conductor
diameter
mm
Ohms per 1000 ft.
Ohms per km
Maximum amps for chassis wiring
Maximum
amps for power transmission
AWG to Metric cross-sectional area in mm2
OOOO
0.46
11.684
0.049
0.16072
380
302
OOO
0.4096
10.40384
0.0618
0.202704
328
239
OO
0.3648
9.26592
0.0779
0.255512
283
190
0
0.3249
8.25246
0.0983
0.322424
245
150
1
0.2893
7.34822
0.1239
0.406392
211
119
2
0.2576
6.54304
0.1563
0.512664
181
94
3
0.2294
5.82676
0.197
0.64616
158
75
4
0.2043
5.18922
0.2485
0.81508
135
60
5
0.1819
4.62026
0.3133
1.027624
118
47
6
0.162
4.1148
0.3951
1.295928
101
37
7
0.1443
3.66522
0.4982
1.634096
89
30
8
0.1285
3.2639
0.6282
2.060496
73
24
9
0.1144
2.90576
0.7921
2.598088
64
19
10
0.1019
2.58826
0.9989
3.276392
55
15
11
0.0907
2.30378
1.26
4.1328
47
12
12
0.0808
2.05232
1.588
5.20864
41
9.3
13
0.072
1.8288
2.003
6.56984
35
7.4
14
0.0641
1.62814
2.525
8.282
32
5.9
15
0.0571
1.45034
3.184
10.44352
28
4.7
16
0.0508
1.29032
4.016
13.17248
22
3.7
17
0.0453
1.15062
5.064
16.60992
19
2.9
18
0.0403
1.02362
6.385
20.9428
16
2.3
19
0.0359
0.91186
8.051
26.40728
14
1.8
20
0.032
0.8128
10.15
33.292
11
1.5
21
0.0285
0.7239
12.8
41.984
9
1.2
22
0.0254
0.64516
16.14
52.9392
7
0.92
23
0.0226
0.57404
20.36
66.7808
4.7
0.729
24
0.0201
0.51054
25.67
84.1976
3.5
0.577
25
0.0179
0.45466
32.37
106.1736
2.7
0.457
26
0.0159
0.40386
40.81
133.8568
2.2
0.361
27
0.0142
0.36068
51.47
168.8216
1.7
0.288
28
0.0126
0.32004
64.9
212.872
1.4
0.226
29
0.0113
0.28702
81.83
268.4024
1.2
0.182
30
0.01
0.254
103.2
338.496
0.86
0.142
31
0.0089
0.22606
130.1
426.728
0.7
0.113
32
0.008
0.2032
164.1
538.248
0.53
0.091
Metric 2.0
0.00787
0.2
169.39
555.61
0.51
0.088
33
0.0071
0.18034
206.9
678.632
0.43
0.072
Metric 1.8
0.00709
0.18
207.5
680.55
0.43
0.072
34
0.0063
0.16002
260.9
855.752
0.33
0.056
Metric 1.6
0.0063
0.16002
260.9
855.752
0.33
0.056
35
0.0056
0.14224
329
1079.12
0.27
0.044
Metric 1.4
0.00551
0.14
339
1114
0.26
0.043
36
0.005
0.127
414.8
1360
0.21
0.035
Metric 1.25
0.00492
0.125
428.2
1404
0.2
0.034
37
0.0045
0.1143
523.1
1715
0.17
0.0289
Metric 1.12
0.00441
0.112
533.8
1750
0.163
0.0277
38
0.004
0.1016
659.6
2163
0.13
0.0228
Metric 1
0.00394
0.1
670.2
2198
0.126
0.0225
39
0.0035
0.0889
831.8
2728
0.11
0.0175
40
0.0031
0.07874
1049
3440
0.09
0.0137
Table Source: The Handbook of Electronic Tables and Formulas for American Wire Gauge
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