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LFPO4 — Power That Never Quits — LiFePO4 Deep Cycle Batteries

Wiring Guide

Series vs Parallel Wiring

How you connect multiple LiFePO4 batteries decides your system voltage and capacity. Get it wrong and you can damage the pack — get it right and you build exactly the system you need. Here is the plain-English version.

Diagram comparing series, parallel, and series-parallel battery wiring

Series

Voltage adds up. Capacity stays the same.

Connect positive of one battery to negative of the next (+ to −). Two 12V 100Ah batteries in series become a 24V 100Ah bank. Use this to reach 24V, 36V, or 48V systems for golf carts, trolling motors, and inverters that need higher voltage.

Example: 2 × 12V 100Ah = 24V · 100Ah

Parallel

Capacity adds up. Voltage stays the same.

Connect all positives together and all negatives together (+ to +, − to −). Two 12V 100Ah batteries in parallel become a 12V 200Ah bank — more runtime at the same voltage. Ideal for RV house banks and off-grid storage.

Example: 2 × 12V 100Ah = 12V · 200Ah

Series-Parallel

Raise voltage AND capacity.

Wire pairs in series, then join those strings in parallel. Four 12V 100Ah batteries become a 24V 200Ah bank — the foundation of larger off-grid and marine systems that need both higher voltage and long runtime.

Example: 4 × 12V 100Ah = 24V · 200Ah

Quick reference

Goal Wiring Result
More voltage (24V / 36V / 48V) Series (+ to −) Voltage adds, capacity unchanged
More runtime (same voltage) Parallel (+ to +, − to −) Capacity adds, voltage unchanged
Both Series-parallel Voltage and capacity both increase

Before you wire — 4 safety rules

  • Only combine identical batteries — same brand, voltage, capacity, and age. Mixing damages the weaker pack.
  • Charge each battery to the same voltage before connecting them in parallel for the first time.
  • Use a correctly sized fuse or breaker on every battery bank, and cable rated for your full current.
  • Confirm your charger and inverter match the final bank voltage (a 12V charger cannot charge a 24V series bank).

Not sure what to wire?

Answer a few questions and we will recommend the exact battery setup for your voltage, runtime, and use case — wiring included.

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