State of Charge (SOC) Algorithm
The AES battery cabinet system uses a multi-method SOC algorithm to ensure high accuracy and reliability in determining the State of Charge (SOC).
SOC Calculation Methods
Coulomb Counting (Method #1)
Active when the battery is charging or discharging (current ≠ 0).
Tracks the charge in and out of the battery in real-time to calculate SOC.
Voltage-Based Lookup Table (Method #2)
Activated when the battery has been idle (0 A current) for more than 2 hours.
Estimates SOC based on resting voltage using a predefined lookup table.
SOC adjustments using this method are limited to decreases only to prevent inaccuracies.
SOC Maintenance & Calibration
To maintain SOC accuracy, the battery must complete a full charge or discharge cycle every two weeks.
This process prevents SOC drift and ensures proper calibration of the algorithm.
Voltage-Based SOC Reference Points
100% SOC = 3.55 V per cell (average)
0% SOC = 2.8 V per cell (average)
This multi-method approach ensures precise SOC monitoring under various operating conditions, improving system performance and reliability.