Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8SUN-7K-G02P1-EU-AM2SUN-7.5K-G02P1-EU-AM2SUN-8K-G02P1-EU-AM2+3
What it means
AC firmware over current — Firmware-level AC over-current protection tripped.
Cause: The AC output current exceeded the firmware limit; the internal AC sensor, its detection circuit on the control board, or a connection wire may be loose.
How to fix it
- 1Check the internal AC sensor, its detection circuit on the control board and the connection wiring
- 2Restart the inverter; if the error still exists, contact your installer or Deye service.
Source: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.61 · 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.51 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.51
Also applies to:SUN-60K-G03SUN-70K-G03SUN-75K-G03SUN-80K-G03SUN-90K-G03SUN-100K-G03SUN-110K-G03SUN-60K-G01P3-EU-AM8-LV+7
What it means
AC firmware over current — Firmware-level AC over-current protection tripped.
Cause: The AC output current exceeded the firmware limit; the internal AC sensor, its detection circuit on the control board, or a connection wire may be loose.
How to fix it
- 1Check the internal AC sensor, its detection circuit on the control board and the connection wiring
- 2Restart the inverter; if the error still exists, contact your installer.
Source: 033_BManual_SUN-70_75_80_90_100_110K-G03_20260702_en_a9db1e1b.pdf, p.60 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.60 · 060_BManual_SUN-60_70_75K-G01P3-EU-AM8-LV_20260701_en_f559aeec.pdf, p.60 · +1 more official manuals
Also applies to:SUN-6K-G06-LV-P1SUN-8K-G06-LV-P1SUN-6K-G06P3-EU-BM2-LV-P1SUN-8K-G06P3-EU-BM2-LV-P1SUN-10K-G05-LVSUN-12K-G05-LVSUN-15K-G05-LVSUN-15K-G06P3-EU-BM2-P1+71
What it means
AC firmware over current — AC current exceeded the firmware (software) over-current limit.
Cause: The internal AC sensor or detection circuit on the control board, or its connection wire, may be loose and giving an over-current reading, or the AC current genuinely exceeded the software limit.
How to fix it
Restart the inverter; if the error still exists, contact your installer or Deye service.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.56 · 031_BManual_SUN-1_1.5_2_2.2_2.5_2.7_3_3.3_3.6_4K-G04P1-EU-AM1_20260624_en_15adc00c.pdf, p.53 · 036_BManual_SUN-3_4_5_6_7_8_9_10_12_15K-G06P3-EU-BM2_20250506_en_0eb78440.pdf, p.56
Also applies to:SUN-5K-SG01HP3-EU-AM2SUN-6K-SG01HP3-EU-AM2SUN-8K-SG01HP3-EU-AM2SUN-10K-SG01HP3-EU-AM2SUN-12K-SG01HP3-EU-AM2SUN-15K-SG01HP3-EU-AM2SUN-20K-SG01HP3-EU-AM2SUN-25K-SG01HP3-EU-AM2+9
What it means
AC Overcurrent (Software) — AC_OverCurr_SW_Failure - AC side overcurrent fault detected by software.
Cause: The AC-side current exceeded the software protection limit, typically because the backup load power and common load power are beyond the allowed range.
How to fix it
- 1Check whether the backup load power and common load power are within the range
- 2Restart and check whether it is normal.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.49 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.50 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.50
Also applies to:SUN-5K-SG04LP3-EUSUN-6K-SG04LP3-EUSUN-8K-SG04LP3-EUSUN-10K-SG04LP3-EUSUN-12K-SG04LP3-EUSUN-3K-SG05LP3-EU-SM2SUN-4K-SG05LP3-EU-SM2SUN-5K-SG05LP3-EU-SM2+9
What it means
AC Overcurrent (Software) — AC over current fault of software - AC side overcurrent fault detected by software.
Cause: The AC-side current exceeded the software protection limit, typically because the backup load power and common load power are beyond the allowed range.
How to fix it
- 1Check whether the backup load power and common load power are within the range
- 2Restart and check whether it is normal
- 3Seek help from us if it cannot go back to the normal state.
Source: 038_BManual_SUN-5_6_8_10_12K-SG04LP3-EU_20260319_en_081932c1.pdf, p.46 · 040_BManual_SUN-3_4_5_6_8_10_12K-SG05LP3-EU-SM2_20260319_en_b0183b7d.pdf, p.46 · 044_BManual_SUN-14_15_16_18_20K-SG05LP3-EU-SM2_20260319_en_ac7cdbd1.pdf, p.46
Energy storage systemFault Also applies to:AI-W5.1-5P3-EU-B-ESSAI-W5.1-6P3-EU-B-ESSAI-W5.1-8P3-EU-B-ESSAI-W5.1-10P3-EU-B-ESSAI-W5.1-12P3-EU-B-ESS
What it means
AC over current fault of software — AC side over-current fault (software detection).
Cause: The combined backup-load and common-load power exceeded the inverter's AC output range.
How to fix it
- 1Check that the backup load power and common load power are within range, restart, and check whether operation is normal.
- 2Seek help from Deye if it does not recover.
Source: 002_Download_4e90fe7a.pdf, p.46
Energy storage systemFault Also applies to:GB-SL5K-EUGB-SL6K-EUGB-SL8K-EUGB-SL10K-EUGB-SL12K-EUGB-SL15K-EUGB-SL20K-EUGB-SL Pro 5K-EU+6
What it means
AC_OverCurr_SW_Failure — AC side over-current fault (software detection).
Cause: The combined backup-load and common-load power exceeded the inverter's AC output range.
How to fix it
- 1Check that the backup load power and common load power are within range, restart, and check whether operation is normal.
- 2Seek help from Deye if it does not recover.
Source: 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.49 · 010_Download_cc05df18.pdf, p.44
Also applies to:GB-A
What it means
ALARM_ID_DSG_OVER_CUR_LEV_2 — Discharge current fault.
Cause: Discharge current exceeded the level-2 limit - the load or PCS demand is above the battery's rated discharge current.
How to fix it
- 1Reduce the load or the PCS discharge-current limit, then restart.
- 2Contact Deye support if it recurs within rating.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.13