DC Wire Sizing Calculator
Free Tool
DC Wire Sizing Calculator
Calculate the correct wire gauge for your Victron, marine, RV, or off-grid DC system based on current, run length, and acceptable voltage drop.
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Actual Voltage Drop
Voltage Lost
Max Ampacity
Circular Mils
Voltage Drop Gauge
0%3% target10%
Nearby Wire Sizes Compared
| AWG | Ampacity | Volt Drop | Drop % |
|---|
Important Notes: This calculator uses the NEC/ABYC copper wire standard (K=12.9) and 60C ampacity ratings for marine and RV applications. Always size your fuse or breaker to protect the wire. For bundled wires or high-temperature environments, derate ampacity per NEC Table 310.15(B)(3). When in doubt, go one size up.
Need a professional installation?JonssonTech designs and installs Victron systems across the Houston area.
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