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

Alarm 2013String Power Abnormal

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

In plain words (editorial)

One PV string delivers abnormally low power – the manual names long-term shading or abnormal ageing of the string. It says to compare the string current with other strings, check for shading, and if the string is clean and unshaded, check for a faulty module.

When to call a service technician: Remove shading if possible; otherwise have your installer check the modules.

✎ 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. 33 official manufacturer document quote verified 2013 String Power Abnormal
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 33 official manufacturer document quote verified the pv string is shaded for a long time
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 33 official manufacturer document quote verified the pv string has aged abnormally
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 33 official manufacturer document quote verified check whether the pv string current is obviously lower than the currents of other pv strings
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 33 official manufacturer document quote verified if yes, check whether the pv string is shaded
  6. [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 33 official manufacturer document quote verified if the pv string is clean and not shaded, check whether any pv module is faulty