Technical FAQs

Ask a Question

BMS AP9921X-AP9922; alarms “Battery Low User Defined Voltage”

 
 
 
Issue:
BMS AP9921X-AP9922; alarms “Battery Low User Defined Voltage”

 
Product line:
Battery Management System (BMS) AP9921X & AP9922

 
Environment:
All models, all serial numbers

 
Cause:
The voltage of a battery is below the configured threshold.

 
Resolution:
Identify the listed batteries immediately so that system backup time is not reduced. Check for exterior causes of this alarm, such as a loose connection or corrosion on a battery post. If the battery has no external problems, perform a follow-up reading with a battery tester. If a specific battery causes repeated alarms (especially if the alarms have increasing deviation percentages), the battery is failing. Replace the battery.
 
 
Was this helpful?
What can we do to improve the information ?