Welcome to Hurricane! Award winning technical support and system design
(866) 434-9765  Remember (866) 4-DIYSOLAR or sales@hurricanewindpower.com  

Wire Size Calculator

Voltage drop formula

The formula for voltage drop depends on the type of the current.

  • For DC or 1-phase AC, V = 2 * I * L * R / A / n
  • For 3-phase AC, V = √3 * I * L * R / A / n


  • V is the voltage drop, measured in volts [V];
  • I is the load current, measured in amperes [A];
  • L is the one-way length of the wire, measured in meters [m];
  • R is the resistivity of the wire, measured in ohm-meters [Ωm];
  • A is the cross-sectional area of the wire, measured in square millimeters [mm²];
  • n is the number of conductors
Voltage Drop Calculator