Natural Check

Trigger condition: During normal operation, after a complete battery charge and discharge session, the SOH check will be performed once. The check does not require manual operations and is triggered when conditions are met.

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 and the batteries discharge to less than 5% SOC, the SOH is checked once.

Impact during the battery SOH check: A natural check is performed during the normal operation of batteries and therefore does not affect the operating status of the ESS.

Automatic Check

Trigger conditions: During normal operation, if the conditions for a natural check are not met, automatic check will be performed one year after the last SOH check. It is also performed three months after the last SOH check near the end of the battery service life (the SOH is between 55% and 65%).

Impacts during the battery health check:

• Only one battery under each inverter can be checked at a time. If there are multiple batteries under an inverter, they will be checked in sequence.
• During an automatic check, a complete charge and discharge session shall be performed on the batteries. During this period, the system running status may not be as expected. During the discharge, the batteries under check cannot be charged. During the charge, all batteries cannot discharge. During the check, the end-of-charge SOC, end-of-discharge SOC, and backup power SOC may exceed the preset values. The battery SOC may decrease to 0%, and the power backup capability and grid peak shaving capability of the system may decrease. During this process, if the power grid fails, power supply to loads may be interrupted. During the check, the SOC values of batteries may fluctuate greatly. After the check is complete, the SOC values will gradually restore to the normal state.
• To ensure accurate calculation, the charging session must be completed within 24 hours. If the charging session exceeds the time limit, the check will fail and an automatic check will be performed 48 hours later. To improve the check success rate and reduce the check duration, you are advised to enable the grid charging function.

• During the automatic check, the working mode of the ESS may be changed. For details, see the following table.
  Table 7-5 Impact of the automatic check (ESS working mode of TOU)

  Current Charging/Discharging Status	Impact of Automatic Check on Charging	Impact of Automatic Check on Discharging
  Charging	The ESS working mode is not affected. Batteries are charged at the maximum power. * In the SmartLogger networking and in the Smart Dongle networking with parallel inverters, the battery under check is charged based on the power of the single battery.	The ESS working mode is not affected. Only the batteries under check cannot be charged.
  Discharging; non-charging and non-discharging	Battery discharging stops. The battery under check is charged based on the power of the single battery.

  Table 7-6 Impact of the automatic check (ESS working mode of maximum self-consumption)

  Current Charging/Discharging Status	Impact of Automatic Check on Charging	Impact of Automatic Check on Discharging
  The PV power is greater than the load power and battery charge power, and the surplus PV power is fed to the grid.	The ESS working mode is not affected. Batteries are charged at the maximum power. * In the SmartLogger networking and in the Smart Dongle networking with parallel inverters, all PV power is used to charge the ESS. If the PV power is insufficient, the ESS may be charged from the grid.	The ESS working mode is not affected. Only the batteries under check cannot be charged.
  The PV power is greater than the load power, and batteries are charged.	The battery under check is charged based on the power of the single battery. The load may need to purchase power from the power grid. * In the SmartLogger networking and in the Smart Dongle networking with parallel inverters, all PV power is used to charge the ESS. If the PV power is insufficient, the ESS may be charged from the grid.
  The PV power is less than the load power, and batteries discharge.	Battery discharging stops. The battery under check is charged based on the power of the single battery. The load consumes more power from the power grid. * In the SmartLogger networking and in the Smart Dongle networking with parallel inverters, all PV power is used to charge the ESS. If the PV power is insufficient, the ESS may be charged from the grid.

  Table 7-7 Impact of the automatic check (ESS working mode of fully fed to the grid)

  Current Charging/Discharging Status	Impact of Automatic Check on Charging	Impact of Automatic Check on Discharging
  The PV power is greater than the power limit at the grid connection point, and batteries are charged.	The battery under check is charged based on the power of the single battery. The feed-in power decreases.	The ESS working mode is not affected. Only the batteries under check cannot be charged.
  The PV power is less than the power limit at the grid connection point, and batteries discharge.	Battery discharging stops. The battery under check is charged based on the power of the single battery. The feed-in power decreases.

  Table 7-8 Impact of the automatic check (inverters in the off-grid scenario)

  Current Charging/Discharging Status	Impact of Automatic Check on Charging	Impact of Automatic Check on Discharging
  /	The batteries under check cannot be charged. When the load power exceeds the PV power and the discharge capability of other batteries, the power supply to the load is affected.	The ESS working mode is not affected. Only the batteries under check cannot be charged.

• In different phases, Battery Health Check is displayed as Pending or In auto detection.

• On the ESS Details screen of the FusionSolar SmartPVMS, the Battery Health Check status of a single battery pack in different phases is displayed as Pending, Request..., Detecting, and Completed.
• When the grid power fails, automatic check exits during off-grid switching. If the SOC is lower than the backup power SOC during switching, backup power may be insufficient.
• During the automatic check, the EMMA (including the load shedding function), peak shaving, and third-party ESS scheduling functions are affected.
• During the automatic check, if the load power is low, the irradiance is weak, or the temperature is too low for a long time, the check may fail. If the check fails, the system does not save the check process data. The check restarts after the conditions are met.
• During the automatic battery health check, the system does not respond to third-party ESS scheduling.

Manual Check

• To prevent detection failure, start Manual Check when the battery SOC is ≥ 5%. For the LUNA2000-S1 ESSs, start Manual Check when the battery SOC is ≥ 10%.

• You can tap Manual Check or Stop test to start or stop the manual check only when the ESS is running properly in an on-grid scenario.
• When Battery Health Check is displayed as Completed or Detection failed., Battery Health Check is automatically restored to Pending if the device is powered off or restarted.
• You are advised to start Manual Check when the energy consumption is high. Otherwise, the check may fail.
• In the charging check phase, the ESS cannot discharge. If there is no PV power, the inverter cannot switch to the off-grid mode when the power grid fails.
• Do not perform update, I-V curve scanning, optimizer search, disconnection detection, or log download during the check.
• For EMMA networking, the EMMA version must be updated to SmartHEMS V100R024C00SPC101 or later.