Calculator
Wire Voltage Drop Calculator
Accuracy note: The arithmetic on this page is deterministic from your inputs. Solar production, code, utility, incentive, and savings outputs are estimates unless you supply exact equipment specs, tariffs, shade data, and local requirements.
Inputs
Result
How this is calculated
DC/single-phase: voltage drop = 2 × current × resistance per foot × one-way length. Three-phase: voltage drop = √3 × current × resistance per foot × one-way length. Percent = drop ÷ source voltage × 100.