// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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sci.battery-state-of-charge-coulomb Calculator
Calculates battery state of charge (SOC) by Coulomb counting: SOC(t) = SOC₀ − ∫(I/Q_rated)dt, accounting for coulombic efficiency. Coulomb counting accumulates error over time — BMS systems combine it with voltage-based OCV estimation (Kalman filter) to prevent drift.
Inputs
Soc Init Pct
Reference formula or conversion factor shown for context.
Q Ah
Maximum throughput or storage. Operating near 100% capacity typically increases failures and wait times.
I A
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
T H
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Eta Coulomb
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
state of charge SOC (t)
The value at the specified point or condition.
remaining capacity (Ah)
Sample size or count used in the calculation.
ΔSOC over period
Reference formula or conversion factor shown for context.
time to empty at current rate
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
SOC = SOC₀ − η·I·t/Q
Reference formula or conversion factor shown for context.
health check
Overall health score or status — a composite measure of how well the system, asset, or metric is performing.