Measure the voltage at the below marked “BAT+” and “BAT-”.
Measurement shown here:
Undervoltage
A Module in which one of the 16 cells has a voltage of <1.5 V is in undervoltage (check with BCP (section 2.5) / BC if possible).
- LVS Modules with >45 V should be fine and you can continue 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 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 module is in undervoltage: remove that one 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 2.5) 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 Batteries status when the battery was left (on /
off / LED).
- Inverter Model, Serial Number and Inverter Logs
-
Access to Inverter portal (add
[email protected] and tell us the name of the system in the portal)
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