How Do You Connect 2 RV Batteries?

To connect two RV batteries, use parallel wiring for increased capacity (Ah) or series for higher voltage (V). For parallel, link both positives and negatives to maintain 12V but double Ah. In series, connect one battery’s positive to the other’s negative, creating 24V. Always match battery type, age, and capacity to prevent imbalance.

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What’s the difference between parallel and series connections?

Parallel connections combine battery capacity while maintaining voltage. Series connections increase voltage but keep capacity unchanged. Choose based on whether your RV needs more runtime (parallel) or higher voltage (series).

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Parallel wiring doubles amp-hour (Ah) capacity at 12V by connecting all positives and negatives together. For example, two 100Ah batteries in parallel provide 200Ah while staying 12V—ideal for extended boondocking. Series connections stack voltages: two 12V batteries become 24V, useful for high-power inverters. Pro Tip: Never mix old and new batteries—capacity mismatch causes premature failure.

How do I safely parallel two 12V RV batteries?

Parallel connections require matching cable lengths and thickness. Connect positive terminals first, then negatives, using 4AWG or thicker cables to minimize resistance and heat buildup.

Start by securing batteries within 18″ of each other to reduce voltage drop. Use marine-grade lugs and anti-corrosion spray on terminals. For instance, two Group 31 batteries should be linked with 36″ cables maximum. Practically speaking, unequal cable lengths create imbalance—a 12″ positive and 24″ negative cable causes uneven current distribution. Pro Tip: Install a bus bar if connecting more than two batteries.

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What are the steps for series connection?

Series wiring demands precision: battery A’s positive connects to battery B’s negative, leaving A’s negative and B’s positive as system terminals. This creates 24V from two 12V batteries.

First, verify both batteries are at 12.6V (±0.2V) before connecting. Use a battery balancer if maintaining individual charge levels—critical for lithium setups. For example, Battle Born batteries in series require a dedicated balancer to prevent cell drift. Beyond voltage considerations, ensure your RV’s converter/charger supports 24V input. Pro Tip: Series-connected batteries discharge simultaneously—replace both if one fails.

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