Parallel Connections of LiFePO₄ Batteries: How They Influence Capacity and Reliability?

Keywords：LiFePO4 parallel connection, battery capacity expansion, lithium battery energy storage

Parallel connections increase capacity (Ah) without changing system voltage. Understanding how this affects performance helps ensure safe and reliable systems.

1. Capacity Expansion and Longer Runtime

Parallel wiring directly increases usable energy:

Two 100Ah batteries in parallel = 200Ah total

This is ideal for large off-grid systems and long-duration energy storage demands.

2. Current Sharing Requirements

Parallel-connected batteries must share current evenly. If not:

One pack may overwork
Uneven heating occurs
Capacity loss accelerates

Batteries must be voltage-matched before paralleling.

3. BMS Compatibility

When each battery has its own BMS, they must be:

Identical models
Same firmware
Same capacity and aging condition

Mismatched BMS behaviors can cause charging conflicts.

4. Safety Considerations

Without equalization:

Inrush current may occur
Cables may overheat
Protection may trigger unpredictably

Install a parallel connection breaker for each battery.

5. Applications

Residential backup systems
Modular commercial ESS
RV / marine large-capacity batteries