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LUNA2000-(5-30)-NHS0
User Manual
8.6 Battery SOH Check
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Impact of SOH Calibration
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Issue 11 (2023-04-15)
To ensure safe and reliable operation of the ESS, the system checks and
calibrates the state of health (SOH) of batteries. If the SOH is low, safety risks
may exist. In this case, the ESS stops working and generates an alarm. During
battery operation, if the SOH calculation conditions are met, the SOH is
calibrated 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% state of charge (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.
For example, when the ESS works in the maximum self-consumption mode, if
the PV power is greater than the load power, the surplus PV power fully
charges the battery to 100% SOC. If the PV power is insufficient, the batteries
discharge to 5% SOC. This process is equivalent to a natural calibration during
battery operation.
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.
SOH natural calibration: Natural calibration occurs when batteries are running
properly and does not affect the operating status of the ESS.
When batteries are in the force SOH calibration state, check that SOH
Calibration Status is Calibrating... in the ESS information by referring to
section
6.3.3 Querying the Battery
Force SOH calibration: During force SOH calibration, the batteries are charged
to 100% SOC, and then immediately discharge to 0% SOC. Charging is not
allowed during the discharging process. 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 under a single
inverter at a time. Battery packs under multiple inverters can be calibrated at
the same time. During force SOH calibration, the working mode of the ESS
will be changed. For details, see the following table.
Copyright © Huawei Technologies Co., Ltd.
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