Quick Start Guide: Parallel Configuration of Gen2 & Gen3 Lithium Batteries

Enerdrive-Dometic Compatibility Statement

Enerdrive-Dometic confirms there are no issues connecting Gen2 and Gen3 Lithium batteries in parallel, provided the following Best Practice steps are followed before configuring and powering on the system.
Following these steps ensures safe operation, optimal performance, and long-term reliability.

Top 5 Critical Steps

1. Use the Same Battery Type & Voltage

• All batteries must be LiFePO₄ and 12V nominal voltage.
• Mixing different chemistries or voltages can cause charging errors, damage, or safety hazards.

2. Match Capacity & Age

• Batteries should have the same capacity (e.g., 200Ah) and be of similar age.
• Mismatched batteries will charge/discharge unevenly, stressing smaller or older units.

3. Match State of Charge (SOC) Before Connecting

• Ensure all batteries are at the same voltage level before connecting.
• Best method: Fully charge each battery individually using the same charger.
• Why? Different voltages can cause large inrush currents, damaging batteries and wiring.

4. Battery Management System (BMS)

• Each battery must have a built-in BMS.
• If using an external BMS, confirm it supports parallel configurations.
• A BMS prevents overcharge, over-discharge, and keeps cells balanced.

5. Fusing & Protection

• Install a fuse or circuit breaker on the positive cable of each battery.
• This protects against short circuits, reducing fire and damage risk.