DALY BMS: How to Analyze Different Currents in Parallel LiFePO4 Batteries

DALY BMS Offers Guidance on Analyzing Current Variations in Parallel LiFePO4 Battery Systems

DALY BMS, a provider of battery management systems, has published insights into understanding discrepancies in current flow among parallel-connected LiFePO4 battery packs. The guidance addresses common observations where individual battery units within a parallel configuration may not share the load equally.

The core advice from DALY BMS is to avoid diagnosing issues based on single data points. While the average current per pack (total current divided by the number of packs) serves as a reference, it does not dictate that each pack must consistently carry an identical current. The critical factor is to identify if the same pack repeatedly shows a significantly higher or lower current under comparable operating conditions.

To diagnose effectively, users are advised to follow a diagnostic path starting with current, then moving to voltage, State of Charge (SOC), and the BMS status. Crucially, comparisons should be made when all packs are under the same charge or discharge condition, with similar system loads, and using the same monitoring method. Repeating these observations is key to identifying a pattern.

If a specific pack consistently deviates in current, further investigation into its voltage, SOC, and BMS status is recommended. If these parameters also show consistent differences, the affected pack may require closer inspection. Should the pack's data appear normal but its current draw remains an outlier, DALY BMS suggests examining the physical connection path, including cables, connectors, and busbars, for any irregularities that could impede equal current sharing.

DALY's 4th Gen Home Energy Storage BMS supports multi-pack configurations of up to 16 batteries, offering individual pack monitoring. This feature aids in identifying outlier packs. The company also offers project-specific verification services for complex setups, requesting detailed data on battery configuration, BMS model, synchronized pack data, and connection architecture.