⚡ ABYC E-11 Dedicated Estimator

12V Marine Wire Size & Voltage Drop Calculator

In 12-Volt electrical systems, low voltage makes circuits extremely vulnerable to voltage drop over distance. Calculate the exact AWG wire size required for your trolling motor, bilge pump, or marine inverter.

⚡ ABYC E-11 Standard

DC Wire Size (AWG) & Voltage Drop Calculator

Marine Grade Tinned Copper (BC-5W2)

1. System Voltage

2. Current Draw (Amps)50 Amps

5A30A50A (Standard)100A150A

3. Total Circuit Length (Round-Trip in Feet)15 Feet

💡 Crucial: Measure distance from battery to appliance and BACK (Positive wire + Negative wire).

4. Allowable Voltage Drop

3% Critical DropTrolling motors, electronics, navigation

10% Non-Critical DropCabin lights, bilge pump, fans

Recommended Cable Size (AWG)

--Tinned Copper

Actual Voltage Drop:-- V (--%)

Voltage at Motor:-- V

Power Wasted (Heat):-- Watts

Min. Circular Mils:-- CM

⚓ ABYC Standards Quick Check

Calculating electrical specs...

Frequently Asked Questions

What size wire do I need for a 12V 50A circuit 15 feet away?

For a 15-foot distance (30 feet round-trip) carrying 50 Amps at 12V with a 3% voltage drop limit, you need 4 AWG marine tinned copper wire.