Travel Trailer Dual Battery Setup: Parallel and Series Wiring Schematics
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1. Wiring Dual 12V Batteries in Parallel
Connecting two 12V batteries in parallel doubles your amp-hour capacity while keeping the voltage at 12V. Cabling must connect diagonally to ensure balanced charging.
2. Wiring Dual 6V Batteries in Series
Series wiring connects the positive terminal of one 6V battery to the negative of another, yielding a high-durability 12V bank with thicker lead plates.
3. Implementing Battery Fuses
Every multi-battery bank must be fitted with an overcurrent protection device (such as an MRBF or ANL fuse) within 7 inches of the positive terminal post.
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Marcus Sterling
Senior Off-Grid Systems Engineer
RV solar installer and electrical engineer with 15+ years of experience designing mobile off-grid power grids.