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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

  1. 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.

  2. 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.

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