BMS AP9921X-AP9922; alarms “Battery Low User Defined Voltage”
Battery Management System (BMS) AP9921X & AP9922
All models, all serial numbers
The voltage of a battery is below the configured threshold.
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.