Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 2015PV String Loss
Name in the manufacturer's documentation (fault list): PV String Loss
[1]
In plain words (editorial)
PV string loss – the manual names abnormal string cable insulation or a short-circuited cable. The manual warns not to operate the DC switch or PV connectors while there is sunlight – this is work for an installer.
When to call a service technician: Have an installer check the string cables. If the fault persists after the string is repaired, contact Huawei technical support.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- The string cable insulation is abnormal or the cable is short-circuited.[2]
Steps given by the manufacturer (source text)
- Do not operate the dc switch or pv connectors of the inverter when solar irradiance is available. when solar irradiance is unavailable and the pv string current decreases to below 0.01 a, turn off the ac and dc switches. check whether the insulation between the cables of the faulty pv string or between the cables and the ground is abnormal. if yes, rectify the fault. note that the preceding operations must be performed on the same day.[3]
- If the device fault persists after the pv string fault is rectified, contact your vendor or technical support.[4]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
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] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 35 official manufacturer document quote verified
2015 PV String Loss
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 36 official manufacturer document quote verified
the string cable insulation is abnormal or the cable is short- circuited.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 36 official manufacturer document quote verified
do not operate the dc switch or pv connectors of the inverter when solar irradiance is available. when solar irradiance is unavailable and the pv string current decreases to below 0.01 a, turn off the ac and dc switches.…
- [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 36 official manufacturer document quote verified
if the device fault persists after the pv string fault is rectified, contact your vendor or technical support.