DC Cable Voltage Drop Calculator
DC Cable Voltage Drop Calculator
Estimate resistive DC drop in a two conductor circuit from an entered conductor area.
DC voltage drop depends on conductor resistance across the full outgoing and return path.
Enter current, conductor area and one way distance. Compare the estimated drop and loss before seeking the separate cable and protection checks.
How to use DC Cable Voltage Drop Calculator
- Enter DC source voltage, current and one way cable length.
- Enter conductor cross section and resistivity at entered condition.
- Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why choose this tool?
The loop length basis helps avoid calculating resistance for only half of a two conductor circuit.
Before you use the result
Loop length is twice the one way distance. This is resistance arithmetic only, not cable ampacity, breaker selection or an installation recommendation. Connections and circuit topology can add losses.
Questions about DC Cable Voltage Drop Calculator
Does this choose a safe cable size?
No. Ampacity, installation conditions, connections and protection requirements need separate assessment.
What should I check before using DC Cable Voltage Drop Calculator?
Check DC source voltage, Current, One way cable length and Conductor cross section. Use the exact units shown beside the controls and replace any example values with your own inputs.
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