Undervoltage
A Module in which one of the 16 cells has a voltage of <1.5 V is in undervoltage (check with BCP (
section 2.9
) / BC if possible).
- LVS Modules with >45 V should be fine and you can go on to check other points according to this service guideline.
- If the module voltage is <40V but the single cell voltage is >1.5V, the battery needs to be charged quickly while avoiding any
further discharge. Therefore, shut down the system and search for the problem according to the guideline, while the battery is
completely switched 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 is able to charge the battery.
- If only one module is in undervoltage: remove that module and try commissioning without it (if the remaining modules still
comply with the Compatible Inverter List). Otherwise, make sure to avoid further overdischarge. (Turn off the system
completely)
- If one, or all modules 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 modules)
-
Individual module voltages of all modules (related to Serialnumber)
-
If possible: Logs from the battery using BCP (
section 2.9
) and Screenshots showing the cell voltages
-
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 battery 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)
2.11 Module Exclusion Method (Identifying a faulty module)
-
Normally a faulty module can be identified with the Be Connect Plus Program or by the LED Code in the
Battery Module. In this case, remove the Module with the Event Code from the system, and commission
the remaining system (if it still complies with the minimum configuration list) and check if it runs
properly. If the problem remains, please also check the module above the one with the Event Code.
-
Otherwise, try the LVS Modules one by one, or by adding Modules one by one into the tower and always
check if the system can work properly to identify a possibly faulty module.
Important: The module quantity must be adjusted in the app whenever the number of modules has
been changed! Don’t forget to perform a proper restart after a new configuration!
1. Switch off the battery (Press button on BMU for 5 seconds until all batteries switch off. Note:
if the modules do not turn off then, something is wrong in the PDU<>BMU connection. Replace
comm cable and try again.)
2. Turn on the Battery (button on topmost battery)
12
