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Fault codes › SMA › Sunny Tripower X 13-30-US (STP xx-US-50)

SMA STP-X-US 3701

Code: 3701
Shown as: Residual current too high > Check generator
Page: 85
ID: fc:sma-stp-x-us-50-3701
IRI: https://solarlattice.org/kb/fc/sma-stp-x-us-50-3701
Status: active
Also known as: 3701, SMA 3701, Residual current too high > Check generator
Category: Inverters

Class fault drafted · lead

Production stops verified · fact

Clears by itself drafted · lead

Decoded

Reports ground fault alarm or trip; look at PV array; confirm with insulation resistance testing, open-circuit voltage measurement, grid voltage measurement, visual inspection, infrared thermography; do: grounding conductor check, 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

Defined in

STPxx-US-50-BE-en-14 — SMA · page 85 drafted · lead
- sec=11.1.20 h=1fc05755d2d4
- sec=h465 h=073e91a4217c

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-60-TL E018, ABB / FIMER TRIO-20.0-27.6-TL E018, ABB / FIMER UNO-DM-3.3-5.0-PLUS E018, ABB / FIMER UNO-DM-6.0-PLUS E018
CPS: CPS SCA50-100K-T PFault0040, CPS SCA50-100K-T Protect0200
Enphase: Enphase M215-M250 GFI Tripped
Fronius: Fronius Galvo 475, Fronius Primo 475, Fronius Symo 475
Huawei: Huawei SUN2000-100KTL-USH0 2031
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 3501, 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 SC-CP-XT 3501, SMA SC-CP-XT 3502, SMA SC-CP-XT 3507, 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
Solis: 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
Sungrow: Sungrow SG200HX 1600-1615, Sungrow SG200HX 1632-1655, Sungrow SG250HX 1600-1615, Sungrow SG250HX 1632-1655, Sungrow SG350HX 1600-1615, Sungrow SG350HX 1632-1655
Yaskawa Solectria: 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 STPxx-US-50-BE-en-14

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h465 h=073e91a4217c

`reports`

c2 drafted · lead Ground fault alarm or trip

STP33-62-US-41-BA-en-13 tbl=18.r1 h=a1fc2477c9ae
STP33-62-US-41 ops manual tbl=7.r1 h=a1fc2477c9ae
STP33-62-US-41-BA-en-14 tbl=19.r1 h=3287c94f0288
SBxx-US-1XP-40-BA-en-13 sec=h210 h=dba4882bde4c
SBxx-US-1XP-41-BA-en-12 sec=h285 h=9e1658bb50c5

`affects`

c3 drafted · lead PV array

STP33-62-US-41-BA-en-13 tbl=18.r1 h=a1fc2477c9ae
STP33-62-US-41 ops manual tbl=7.r1 h=a1fc2477c9ae
STP33-62-US-41-BA-en-14 tbl=19.r1 h=3287c94f0288
SBxx-US-1XP-40-BA-en-13 sec=h210 h=dba4882bde4c

`detected_by`

c4 drafted · lead Insulation resistance testing

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h467 h=10a07fe57d31

c5 drafted · lead Open-circuit voltage measurement

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h467 h=10a07fe57d31

c6 drafted · lead Grid voltage measurement

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h467 h=10a07fe57d31

c7 drafted · lead Visual inspection

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h467 h=10a07fe57d31

c8 drafted · lead Infrared thermography

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h467 h=10a07fe57d31

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

`mitigated_by`

c9 drafted · lead Grounding conductor check

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h467 h=10a07fe57d31

c10 drafted · lead DC wiring check

STP33-62-US-41-BA-en-14 tbl=19.r1 h=3287c94f0288
SBxx-US-1XP-41-BA-en-12 sec=h286 h=3450f514b95f
SBSExx-US-50-BE-en-11 sec=h573 h=0818fdbe4234

`has_event_class`

c11 drafted · lead Fault (device stops or needs intervention)

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h466 h=ceee8640eb7c

review note: support check: partial - Describes an insulation error with auto reconnect; fault class is only loosely implied, not stated.

`has_production_effect`

c12 verified · fact Trip (production stops)

Momentary insulation error; inverter disconnects and reconnects.

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h466 h=ceee8640eb7c

verified by: review-workflowverified on: 2026-10-23review note: support check: partial - The inverter reconnects implying it disconnected, but disconnecting is not explicitly stated.

`has_recovery`

c13 drafted · lead Auto-reset (clears by itself)

Reconnects once values return to permissible range.

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h466 h=ceee8640eb7c

`applies_to`

c14 drafted · lead Sunny Tripower X US-50

STPxx-US-50-BE-en-14 sec=11.1.20 h=1fc05755d2d4
STPxx-US-50-BE-en-14 sec=h465 h=073e91a4217c

Data