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Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)

Alarm 2051Abnormal Residual Current

Name in the manufacturer's documentation (fault list): Abnormal Residual Current[1]

In plain words (editorial)

The inverter detected abnormal residual (leakage) current – the insulation resistance of the input to ground dropped during operation. The inverter shuts down. Occasional alarms may be a temporary external issue and clear automatically.

When to call a service technician: If the alarm is frequent or persists, have an installer check the DC-to-ground resistance.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 50 official manufacturer document quote verified 2051 Abnormal Residual Major
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 50 official manufacturer document quote verified The input-to-ground insulation resistance decreases during device
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 50 official manufacturer document quote verified The device will automatically recover after the fault is rectified.
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 50 official manufacturer document quote verified check whether the DC-to-ground resistance is too low.
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 50 official manufacturer document quote verified The device is shut down.