Why the percentage on the screen drifts, and how to monitor a pack properly.
How SOC is estimated and why it drifts
LFP’s flat voltage curve makes voltage-based gauges unreliable; a shunt or coulomb counter is the honest method.
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Monitoring hardware and what to watch
Watch cell balance under load and the internal resistance trend — both move before capacity does.
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Questions
Short answers to the ones that come up most.
Why does my gauge show the wrong percentage?
Because it is estimating from voltage on a flat curve. Fit a shunt-based monitor.
What should I monitor?
Cell balance under load, temperature and delivered capacity over time.
Do I need a smart BMS?
Not always, but Bluetooth or CAN access turns every fault into a five-minute check.
