Voltage Drop Calculator
Voltage Drop Calculator
Find the right PV wire gauge for your solar installation — NEC 3% guideline built in.
Results
Voltage loss
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All gauge options — same conditions
| Gauge | V Drop (V) | Loss (%) | Delivered (V) | Status |
|---|
Calculation uses the round-trip formula: Vdrop = 2 × L × I × R. Resistance values per NEC Table 9 (75°C copper, conduit). For engineering decisions, consult a licensed electrician.