11
Undervoltage
A LVL in which one of the 16 cells has a voltage of <1.5 V is in undervoltage (check with BCP (section 2.5) / BC if
possible).
- LVL with >45 V should be fine and you can continue to check other points according to this service guideline.
- If the LVL voltage is <45V but the single cell voltage is >1.5V, the battery needs to be charged quickly while
avoiding any further discharge. Therefore shutdown the system and search the problem according to the
guideline, while the battery is completely off. Also check on the inverter side why the force charge doesn’t work.
Do not turn on the battery before making sure the inverter should be able to charge the battery.
- If only one LVL is in undervoltage: remove that one and try commissioning without it. Otherwise, make sure to
avoid further overdischarge. (Turn off the system completely)
- If one, or all LVL are in undervoltage: Contact the service as stated below and make sure to avoid any further
discharge of the battery (Turn off the system completely)
When contacting the service, make sure to fill the service checklist completely and add the following
information:
-
Serial Numbers (of the BMU and all (affected) LVL)
-
Individual LVL voltages of all LVL (related to Serialnumber)
-
Logs from the battery using BCP (section 2.5) and Screenshots showing the cell voltages, or manual
cell voltage measurements
-
Initial Firmware (FW) Version of the Battery when the UV happened (BMU and BMS)
-
Detailed description how and why the system reached Undervoltage if known. Information when the
system was installed and commissioned and in which circumstance and when the undervoltage
happened. If the battery was never running before: Why did it never work before, and what was the
Batteries status when the battery was left (on / off / LED).
-
Inverter Model, Serial Number and Inverter Logs
-
Access to Inverter portal (add
and tell us the name of the system in the portal)
