Wire Sizing Calculator

                 
       
  Solar Systems Wire Sizing Calculator  
       
       
  Enter solar system working voltage in V  
  Enter expected working peak power in W
 
  Enter cable's working temperature
 
  Enter desired voltage drop in  % %  
  Enter supposed cable length
 
  Cable wire size needed in mm2/cross sectional area/  
  Wire diameter  in inches  
  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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