Use this calculator to determine the voltage drop of the wiring harness used on your salt spreader. For the most accurate information please check the wire gauge and length of each segment in your system, calculate them individually then add the losses together: From the battery to the controller, controller to the bumper and the bumper to the spreader motor(s). This calculator can be used with American Wire Gauge from 4/0 AWG to 30 AWG, aluminum or copper wire. (Note: It just calculates the voltage drop, there are other system efficiency losses that help make up the overall system voltage losses.)

Select Copper or Aluminum

Select American Wire Gauge (AWG) Size

Select Voltage

Enter 1-way circuit
length in feet

Enter Load
in amps


Voltage drop

Voltage at load end of circuit

Per Cent voltage drop

Wire cross section in circular mils