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

Alarm 2012String Current Backfeed

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

In plain words (editorial)

Current is flowing backwards into a PV string. The manual names a string with only a few PV modules in series, or reverse polarity in the string; shading and the string's open-circuit voltage are also checked.

When to call a service technician: Have your installer check the string configuration and polarity.

✎ 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. 32 official manufacturer document quote verified 2012 String Current Backfeed
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 32 official manufacturer document quote verified only a few pv modules are connected in series in the pv string
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 32 official manufacturer document quote verified reverse polarity occurs in the string
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 32 official manufacturer document quote verified check whether the number of pv modules connected in series to this pv string is less than
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 32 official manufacturer document quote verified check whether the pv string is shaded
  6. [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 32 official manufacturer document quote verified check whether the open-circuit voltage of the pv string is normal
  7. [7] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 32 official manufacturer document quote verified check whether pv modules in the pv string are connected in reverse polarity