Fault codes › SMA › Sunny Tripower CORE1-US (STP 33/50/62-US-41)

SMA CORE1-US 3501

Code: 3501
Shown as: Insulation failure > Check generator
Page: 48
ID: fc:sma-stp-core1-us-3501
IRI: https://solarlattice.org/kb/fc/sma-stp-core1-us-3501
Status: active
Also known as: 3501, SMA 3501, Insulation failure > Check generator
Category: Inverters

Class fault verified · fact

Production stops drafted · lead

Clears not stated

Decoded

Reports ground fault alarm or trip, low insulation resistance; may indicate loss of electrical insulation; look at PV array, DC cable, DC connector; confirm with insulation resistance testing, open-circuit voltage measurement, DC voltage measurement, visual inspection, infrared thermography; do: DC wiring check.

What can be behind Ground fault alarm or trip

Failure modes that present as the reported condition, and the tests that tell them apart.

Backsheet Cracking drafted · lead
Cable Defect verified · fact
Connector Defect drafted · lead
Glass Breakage drafted · lead
Grounding fuse failure verified · fact
Loss of electrical insulation drafted · lead

What can be behind Low insulation resistance

Failure modes that present as the reported condition, and the tests that tell them apart.

Defined in

STP33-62-US-41-BA-en-13 — SMA Solar Technology · 13 drafted · lead
- sec=h260 h=18e63b06a6a6
- sec=h261 h=280ff65da917
STP33-62-US-41 ops manual — SMA Solar Technology drafted · lead
- sec=h177 h=18e63b06a6a6
- sec=h178 h=280ff65da917
STP33-62-US-41-BA-en-14 — SMA drafted · lead
- sec=h262 h=18e63b06a6a6
- sec=h263 h=280ff65da917

The manufacturer's own cause and corrective text is not reproduced here.

Same condition on other equipment

ABB / FIMER: ABB / FIMER PVS-166-175-TL E018, ABB / FIMER PVS-166-175-TL E025, ABB / FIMER PVS-166-175-TL E037, ABB / FIMER PVS-60-TL E018, ABB / FIMER PVS-60-TL E025, ABB / FIMER PVS-60-TL E037, ABB / FIMER TRIO-20.0-27.6-TL E018, ABB / FIMER TRIO-20.0-27.6-TL E025, ABB / FIMER TRIO-20.0-27.6-TL E037, ABB / FIMER UNO-DM-3.3-5.0-PLUS E018, ABB / FIMER UNO-DM-3.3-5.0-PLUS E025, ABB / FIMER UNO-DM-6.0-PLUS E018, ABB / FIMER UNO-DM-6.0-PLUS E025
CPS: CPS SCA25KTL-208 IsolationErr, CPS SCA25KTL-480 IsolationErr, CPS SCA36KTL IsolationErr, CPS SCA50-100K-T PFault0040, CPS SCA50-100K-T Protect0190, CPS SCA50-100K-T Protect0200, CPS SCA50-60KTL IsolationErr, CPS SCH100-125KTL IsolationErr, CPS SCH125KTL-AIO IsolationErr, CPS SCH200-250K-T IsolationErr, CPS SCH275KTL IsolationErr, CPS SCH350KTL IsolationErr
Canadian Solar: Canadian Solar 125K-T600GL02 PV ISO-PRO 01/02, Canadian Solar 125K-T600GL02 PV-MID-ISO, Canadian Solar 185-255K PV ISO-PRO 01/02, Canadian Solar 23-28KTL-CT IsolationErr, Canadian Solar 25-40K-T480GL01 PV ISO-PRO 01/02, Canadian Solar 50-66K-T480GL01 PV ISO-PRO 01/02, Canadian Solar 75-100K-T480GL02 PV ISO-PRO 01/02
Enphase: Enphase IQ7 DC Resistance Low - Power Off, Enphase IQ8 DC Resistance Low - Power Off, Enphase IQ9N DC Resistance Low - Power Off, Enphase M215-M250 DC Resistance Low - Power Off, Enphase M215-M250 GFI Tripped
Fronius: Fronius Galvo 475, Fronius Galvo 502, Fronius Primo 447, Fronius Primo 475, Fronius Primo 502, Fronius Symo 447, Fronius Symo 475, Fronius Symo 502
Huawei: Huawei SUN2000-100KTL-USH0 2031, Huawei SUN2000-100KTL-USH0 2062, Huawei SUN2000-25-30KTL-US 313, Huawei SUN2000-45KTL-US-HV-D0 313
KACO new energy: KACO new energy blueplanet TL3 181, KACO new energy blueplanet TL3 182, KACO new energy blueplanet TL3 183
SMA: SMA SB-US-40 3501, SMA SB-US-40 3601, SMA SB-US-40 3701, SMA SB-US-41 3501, SMA SB-US-41 3601, SMA SB-US-41 3701, SMA SBSE-US-50 3501, SMA SBSE-US-50 3601, SMA SBSE-US-50 3701, SMA PEAK3-US 3501, SMA PEAK3-US 3601, SMA PEAK3-US 3701, SMA CORE1-US 3701, SMA STP-TL-US 3501, SMA STP-TL-US 3601, SMA STP-TL-US 3701, SMA STP-X-US 3501, SMA STP-X-US 3601, SMA STP-X-US 3701, SMA SC-CP-XT 3501, SMA SC-CP-XT 3502, SMA SC-CP-XT 3504, SMA SC-CP-XT 3507, SMA SC-CP-XT 3510, SMA SC-CP-XT 3511, SMA SC-CP-XT 3512, SMA SC-CP-XT 3515, SMA SC-CP-XT 3601, SMA SC-CP-XT 6487
Schneider Electric: Schneider Electric CL125 033, Schneider Electric CL125 039, Schneider Electric CL125 055
Solis: Solis 1P-4G-US PV ISO-PRO 01/02, Solis 3P-5G-US PV ISO-PRO 01/02, Solis RHI-1P-HV PV ISO-PRO 01/02, Solis S5-GC PV ISO-PRO 01/02, Solis S6-EH1P PV ISO-PRO 01/02, Solis S6-EH2P PV ISO-PRO01, Solis S6-EH2P PV ISO-PRO02, Solis S6-EH3P30-60K PV ISO-PRO01, Solis S6-EH3P30-60K PV ISO-PRO02, Solis S6-EH3P75-150K PV ISO-PRO01, Solis S6-EH3P75-150K PV ISO-PRO02, Solis S6-GC PV ISO-PRO 01/02, Solis S6-GU PV ISO-PRO 01/02
Sungrow: Sungrow SG-CX-US 039, Sungrow SG200HX 1600-1615, Sungrow SG200HX 1632-1655, Sungrow SG200HX 039, Sungrow SG250HX 1600-1615, Sungrow SG250HX 1632-1655, Sungrow SG250HX 39, Sungrow SG350HX 1600-1615, Sungrow SG350HX 1632-1655, Sungrow SG350HX 039
Yaskawa Solectria: Yaskawa Solectria PVI-25TL-R IsolationErr, Yaskawa Solectria PVI-TL IsolationErr, Yaskawa Solectria SGI-XTM DC GND Fault, Yaskawa Solectria SGI-XTM RCM Fault, Yaskawa Solectria XGI-1500-1MW CRIT-7, Yaskawa Solectria XGI-1500 CRIT-7, Yaskawa Solectria XGI-1500-DCG CRIT-7

Same code in other families

Claims

`defined_in`

c1 drafted · lead STP33-62-US-41-BA-en-13

STP33-62-US-41-BA-en-13 sec=h260 h=18e63b06a6a6
STP33-62-US-41-BA-en-13 sec=h261 h=280ff65da917

c2 drafted · lead STP33-62-US-41 ops manual

STP33-62-US-41 ops manual sec=h177 h=18e63b06a6a6
STP33-62-US-41 ops manual sec=h178 h=280ff65da917

c3 drafted · lead STP33-62-US-41-BA-en-14

STP33-62-US-41-BA-en-14 sec=h262 h=18e63b06a6a6
STP33-62-US-41-BA-en-14 sec=h263 h=280ff65da917

`reports`

c4 drafted · lead Ground fault alarm or trip

SBxx-US-1XP-40-BA-en-13 sec=h204 h=90a2ed93d28f
STPTL-US-10-IA-xx-22 tbl=15.r3 h=37b0c92512b9
SBxx-US-1XP-41-BA-en-12 sec=h277 h=aa84d8588c73
SBSExx-US-50-BE-en-11 sec=h559 h=b4a70384c4fe
SHPxxx-US-21-BE-en-11 sec=h320 h=aa84d8588c73

c5 drafted · lead Low insulation resistance

SCCPXT-E7-WA-en-37 tbl=35.r1 h=82dbfd767650
STPxx-US-50-BE-en-14 sec=h453 h=ff98adfd21c5

`indicates`

c6 drafted · lead Loss of electrical insulation

Defective insulation or faulty plug connections are named as the frequent cause.

STPxx-US-50-BE-en-14 sec=h453 h=ff98adfd21c5

`affects`

c7 drafted · lead PV array

SBxx-US-1XP-40-BA-en-13 sec=h204 h=90a2ed93d28f
STPTL-US-10-IA-xx-22 tbl=15.r3 h=37b0c92512b9
SCCPXT-E7-WA-en-37 tbl=35.r1 h=82dbfd767650

c8 drafted · lead DC cable

SBSExx-US-50-BE-en-11 sec=h560 h=8ca40d7d772c
STPxx-US-50-BE-en-14 sec=h453 h=ff98adfd21c5

c9 drafted · lead DC connector

STPxx-US-50-BE-en-14 sec=h453 h=ff98adfd21c5
STPxx-US-50-BE-en-14 sec=h454 h=736fbc74e526

`detected_by`

c10 drafted · lead Insulation resistance testing

STPxx-US-50-BE-en-14 sec=h454 h=736fbc74e526

c11 drafted · lead Open-circuit voltage measurement

STPxx-US-50-BE-en-14 sec=h454 h=736fbc74e526

review note: support check: partial - Open-circuit voltage measurement is listed as a verification step, but not explicitly as detection of this fault.

c12 drafted · lead DC voltage measurement

String pole-to-ground voltage measurement.

STPxx-US-50-BE-en-14 sec=h454 h=736fbc74e526

c13 drafted · lead Visual inspection

SBSExx-US-50-BE-en-11 sec=h560 h=8ca40d7d772c
STPxx-US-50-BE-en-14 sec=h454 h=736fbc74e526

c14 drafted · lead Infrared thermography

STPxx-US-50-BE-en-14 sec=h454 h=736fbc74e526

review note: support check: partial - IR camera is only a tip for support, not a stated detection method.

`mitigated_by`

c15 drafted · lead DC wiring check

STP33-62-US-41-BA-en-13 sec=h262 h=e4a2a2e70403
STP33-62-US-41 ops manual sec=h179 h=e4a2a2e70403
SBxx-US-1XP-40-BA-en-13 sec=h205 h=7f7d30d371d5
SBxx-US-1XP-41-BA-en-12 sec=h278 h=3450f514b95f
SBSExx-US-50-BE-en-11 sec=h560 h=8ca40d7d772c
SHPxxx-US-21-BE-en-11 sec=h321 h=3450f514b95f

`has_event_class`

c16 verified · fact Fault (device stops or needs intervention)

STPxx-US-50-BE-en-14 sec=h453 h=ff98adfd21c5
Event 3501 with Sunny Boy Smart Energy SBSE-US-50 sec=h1 h=05d7bba15124

verified by: review-workflowverified on: 2026-10-23review note: support check: partial - Inverter disconnects/does not operate, but 'Fault' classification isn't explicitly stated.

`has_production_effect`

c17 drafted · lead Trip (production stops)

Inverter disconnects from grid or fails to connect during self-test.

STPxx-US-50-BE-en-14 sec=h453 h=ff98adfd21c5
Event 3501 with Sunny Boy Smart Energy SBSE-US-50 sec=h1 h=05d7bba15124

`applies_to`

c18 drafted · lead Sunny Tripower CORE1-US

STP33-62-US-41-BA-en-13 sec=h260 h=18e63b06a6a6
STP33-62-US-41-BA-en-13 sec=h261 h=280ff65da917
STP33-62-US-41 ops manual sec=h177 h=18e63b06a6a6
STP33-62-US-41 ops manual sec=h178 h=280ff65da917
STP33-62-US-41-BA-en-14 sec=h262 h=18e63b06a6a6
STP33-62-US-41-BA-en-14 sec=h263 h=280ff65da917

SMA CORE1-US 3501

Decoded

What can be behind Ground fault alarm or trip

What can be behind Low insulation resistance

Defined in

Same condition on other equipment

Same code in other families

Claims

defined_in

reports

indicates

affects

detected_by

mitigated_by

has_event_class

has_production_effect

applies_to

Data