Series vs Parallel - Building 12.8V or 25.6V Lithium Systems

Intro
Most caravans use 12.8V LiFePO4, but some benefit from 25.6V. Here is when to use series or parallel - and what to watch for.

Parallel - More Capacity at the Same Voltage

• Use case - extend runtime at 12.8V by paralleling two or more identical batteries.
• Best practice - same brand, model and age, charge each battery fully before paralleling.
• Cabling - balance the take-off and return so current shares evenly.

Series - Step Up to 25.6V

• Use case - reduce current for higher-power inverters or long cable runs.
• Compatibility - all chargers, MPPT and loads must support 24/25.6V.
• BMS considerations - ensure your batteries are designed for series use per the manufacturer.

Common Mistakes

• Mixing battery sizes or ages in the same bank.
• Skipping pre-charge balancing before paralleling.
• Using chargers that do not support your chosen system voltage.

Bottom line
Choose parallel to increase capacity at 12.8V, series to step to 25.6V - but only with batteries and chargers approved for that configuration.

Shop matching lithium batteries for parallel or series use