Low battery DC input bus voltage 3000-2 LUNA2000-(5-30)-S0

According to the manual

ID	Name	Severity	Cause	Solution
3000	Low battery DC input bus voltage	Major	1. The DC bus voltage of the battery is low. 2. The battery DC switch is OFF. 3. The battery cables are not correctly connected.	1. Turn off the inverter AC output switch, inverter DC input switch, and battery DC switch, and wait for 5 minutes. 2. Check the cable connections to the [Battery-1/2] power control module by referring to the quick installation guide. 3. After checking that the battery power cables are correctly connected, turn on the battery DC switch, AC output switch, and inverter DC input switch in sequence. 4. If the alarm persists, contact your dealer or Huawei technical support.

 

Problem Description

One LUNA2000-(5-30)-S0 energy storage system and one SUN2000-10KTL-M1 inverter are deployed onsite. The LUNA2000 battery is dead due to long-term storage. After the battery is replaced, the alarm 3000-2 DC input bus voltage is low.

Handling Method

The 3000-2 alarm is caused by the abnormal connection of the power cable between the LUNA2000 and the inverter. Therefore, the possible causes are as follows:

1. The energy storage fuse is faulty or the energy storage switch is not closed.
2. The PV end of the self-made cable between the LUNA2000 and the inverter is not properly crimped. As a result, the power cord is not connected properly.
3. The power control module of the LUNA2000 is faulty.

Handling Procedure

1. Rectify the fuse fault on site and confirm that the switch is closed on site. Therefore, both cases were excluded.
2. Check the self-made cable between the LUNA2000 and the inverter. Found a loose cable.
3. After the power cable is reconfigured onsite, the 3000-2 alarm is cleared, but the alarm indicating that the communication of the battery expansion module is abnormal is generated.
4. Confirm with the onsite personnel that the LUNA2000 battery has been replaced due to long-term storage. However, the failed device is not deleted. Remove redundant batteries on-site. Then, the fault is rectified.

Summary

Do not store batteries for a long time. They should be used immediately after on-site deployment. The battery shall be disposed of as follows.

NOTE:

• Dispose of deformed, damaged, or leaking batteries directly, regardless of how long they have been stored.
• The storage time is calculated from the last charging time marked on the battery pack. If the battery is qualified after charging, update the latest charging time and next charging time on the label. (Next charging time = latest charging time + charging interval).
• The maximum storage period of lithium batteries is three years. A lithium battery can be recharged up to 3 times in three years. For example, it can be changed every 8 months or every 12 months. If the maximum allowable storage period and the number of recharge times are exceeded, it is recommended that the battery be discarded.
• If lithium batteries are stored for a long time, capacity loss may occur. After the lithium battery is stored at the recommended storage temperature for 12 months, the irreversible capacity loss rate is 3% to 10%. If the discharge test is performed according to the specifications, the battery may fail the test if the storage capacity is not 100% of the rated capacity.

After replacing the battery, delete the redundant battery on the device attached page to prevent the power control module from mistakenly determining that the battery is disconnected and causing alarms.