What it means
Cell voltage accumulation undervoltage alarm in battery cluster (level 1)
Cause: Vsum < 2.50V × N (N = number of battery strings).
How to fix it
- Send faults externally.
- Recovers when Vsum > 2.60V × N.
Source: FLS-ES232LC-S.pdf
Felicity ESS error 0x10B1
Cell voltage accumulation undervoltage alarm in battery cluster (level 1)
Warning — a protection warning — the ESS unit keeps running, but deal with the cause before it escalates.
Frequently asked questions
- What does error 0x10B1 mean on a Felicity ESS?
- 0x10B1 means: Cell voltage accumulation undervoltage alarm in battery cluster (level 1). Vsum < 2.50V × N (N = number of battery strings).
- Is error 0x10B1 a fault or a warning?
- 0x10B1 is a warning: the unit keeps running. Fix the underlying condition before it escalates.
- How do I clear or fix error 0x10B1?
- Send faults externally. Recovers when Vsum > 2.60V × N.
Related error codes
Other codes on the FLS-ES232LC-S
- 0x10A1WarningCell voltage accumulation overvoltage alarm in battery cluster (level 1).
- 0x10A2FaultCell voltage accumulation overvoltage alarm in battery cluster (level 2).
- 0x10A3CriticalCell voltage accumulation overvoltage alarm in battery cluster (level 3).
- 0x10B2FaultCell voltage accumulation undervoltage alarm in battery cluster (level 2).
- 0x10B3CriticalCell voltage accumulation undervoltage alarm in battery cluster (level 3).
- 0x10C1WarningLow insulation fault (level 1).
Prefer the full written guide? Read the complete Felicity inverter error-code guide
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.