Battery Health Check - Huawei LUNA2000-7-S1 User Manual

LUNA2000-(7, 14, 21)-S1
User Manual

7.6 Battery Health Check

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Impact of Battery Health Check
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Issue 01 (2024-03-27)
To ensure safe and reliable operation of the ESS, the system checks the state
of health (SOH) of batteries. If the SOH decreases to the minimum threshold,
the ESS stops working and reports an alarm to avoid safety risks. During
battery operation, if the SOH calculation conditions are met, the SOH is
checked naturally. If the SOH calculation conditions are not met, the forced
check is required.
Natural check: During normal operation, when batteries are fully charged and
then discharge to about 5% to 10% state of charge (SOC) and the batteries
are not charged during the discharge, the SOH is checked during this process
naturally.
For example, in the maximum self-consumption mode, when the PV power is
greater than the load power, the batteries are fully charged to 100% SOC by
the surplus PV power. When the PV power is insufficient, the batteries
discharge to 5% SOC. The SOH is checked during this process naturally.
Forced check: The forced check is performed one year after the last SOH
check during normal operation or one month after the last SOH check near
the end of the battery service life.
Natural check: Natural checks are performed during normal operation and do
not affect the operating status of the ESS.
In different phases of Battery Health Check, the status is displayed as
Detection Request (Requesting calibration), Detecting... (Calibrating...),
Pending (Idle) or Detection ends (Calibration completed). For details, see
6.4.3 Querying the ESS
Forced check: During the forced check, 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 discharging time. If the
discharging process exceeds the time limit, the check will fail and then restart
48 hours later. The forced check is performed on an individual battery pack.
Only one battery pack can be checked under an inverter at a time. Battery
packs under multiple inverters can be checked at the same time. During the
forced check, the working mode of the ESS may be changed. For details, see
the following table.
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