The wire warms from green to red as the voltage drop grows — longer runs and thinner gauges lose more.
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Options
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Presets
Long thin run
Upsize the wire
Aluminium instead
12 V DC (solar / RV)
System
DC — 2 conductors
Single-phase AC — 2 conductors
Three-phase AC — line-to-line
Source voltage
12 V
24 V
48 V
120 V
230 V
240 V
400 V
480 V
Load current
16 A
Run length (one-way)
30 m
Conductor
Copper — ρ = 1.72×10⁻⁸ Ω·m
Aluminium — ρ = 2.82×10⁻⁸ Ω·m
Wire gauge (AWG)
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG
4 AWG
2 AWG
1 AWG
1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG
Conductor resistance (one-way)
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Voltage drop
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Drop percentage
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Voltage at load
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Power lost in wiring
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Verdict
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Voltage Drop Calculator · Made with LK Forge ↗
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