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

What the LEDs on a Huawei SUN2000-M1 inverter mean

Summary (editorial)

The LED colours and blinking patterns show PV, grid connection, communication and alarm states, as described in the manual.

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

From the manufacturer's documentation (English source wording, with page)

  1. LED1 and LED2 steady green: the SUN2000 is operating in grid-tied mode[1]
  2. LED1 blinking green at long intervals, LED2 off: the DC is on and the AC is off[2]
  3. LED1 and LED2 blinking green at long intervals: the DC is on, the AC is on, and the SUN2000 is not exporting power to the power grid[3]
  4. LED1 off, LED2 blinking green at long intervals: the DC is off and the AC is on[4]
  5. LED1 and LED2 off: both the DC and AC are off[5]
  6. LED1 blinking red at short intervals: DC environmental alarm, e.g. High String Input Voltage, String Reverse Connection, or Low Insulation Resistance[6]
  7. LED2 blinking red at short intervals: AC environmental alarm, e.g. Grid Undervoltage, Grid Overvoltage, Grid Overfrequency or Grid Underfrequency[7]
  8. LED1 and LED2 steady red: Fault[8]
  9. LED1, LED2 and LED3 steady red: the SUN2000 hardware is faulty and needs to be replaced[9]
  10. LED3 blinking green at short intervals: communication is in progress; off: there is no communication[10]
  11. Steady orange (LED1 and LED2): the SUN2000 is operating in the off-grid mode[11]
  12. If the off-grid load is overloaded, LED1 and LED2 blink orange slowly. Reduce the off-grid load power and manually clear the alarm or wait until the inverter is recovered; the inverter attempts to restart at an interval of 5 minutes[12]
  13. Wait for about 1 minute and observe the LED indicators on the SUN2000 to check its running status[13]

⚠ 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. [1] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified the sun2000 is operating in grid- tied mode.
  2. [2] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified the dc is on and the ac is off.
  3. [3] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified is not exporting power to the power grid.
  4. [4] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified the dc is off and the ac is on.
  5. [5] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified both the dc and ac are off.
  6. [6] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified there is a dc environmental alarm,
  7. [7] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified there is an ac environmental alarm,
  8. [8] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified steady red steady red fault
  9. [9] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 89 official manufacturer document quote verified the sun2000 hardware is faulty.
  10. [10] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 89 official manufacturer document quote verified there is no communication.
  11. [11] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified operating in the off-grid mode.
  12. [12] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 89 official manufacturer document quote verified reduce the off-grid load power and manually clear the alarm or until the inverter is
  13. [13] SUN2000-(3KTL-10KTL)-M1 User Manual (Issue 28, 2026-03-30) (EDOC1100163578 Issue 28) , p. 88 official manufacturer document quote verified wait for about 1 minute and observe the led indicators on the sun2000 to check its running status.