naturally. If the SOH calculation conditions are not met, the SOH value may
be inaccurate. In this case, force SOH calibration is required to accurately
calculate the SOH value.
● Natural SOH calibration: When batteries are fully charged during normal
operation and discharge to about 5% to 10% SOC and the batteries are not
charged during the discharge, the SOH value is calculated during this process,
which is equivalent to a natural calibration.
● Force SOH calibration: In normal operation, force SOH calibration is
performed one year after the last SOH calibration (natural or force
calibration). It is also performed one month after the last SOH calibration
(natural or force calibration) near the end of the battery service life.
Impact of SOH Calibration
● Natural SOH calibration: Natural calibration occurs when batteries are
running properly and does not
aect the operating status of the ESS.
● Force SOH calibration: During force SOH calibration, the batteries are charged
to 100% SOC, and then immediately discharge until the SOC reaches 0%.
Charging is not allowed during discharging. To ensure accurate calculation,
the discharging process needs to be completed within 24 hours. In this case,
you can increase the load power to shorten the calibration time. If the
discharge time limit is exceeded, the calibration will fail. After the failure, the
calibration will be started again 48 hours later. Force SOH calibration is
performed on a single battery pack. Only one battery pack can be calibrated
at a time in single-system scenarios. Multiple battery packs can be calibrated
at the same time in parallel-system scenarios. During force SOH calibration,
the working mode of the ESS will be changed.
In the PV+ESS scenario, the ESS may stop working after the lithium battery calibration
is complete. The PV system charges the ESS until the value of Available SOC for
Lithium Batteries(%) is reached, and then the ESS works again.
iSitePower-M (MAP05A1, MAB05B1)
User Manual 12 System Maintenance
Issue 06 (2023-04-24) Copyright © Huawei Digital Power Technologies Co., Ltd. 197
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