Cali-Graf in Southern California

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String inverterSolis (Ginlong Technologies)

Solis (Ginlong Technologies) S6-GU350K-EHV-US-M12

String inverter. 2 models, 250 kW–350 kW AC at 600 V / 800 V.

UL 1741 SBCEC listed · Feb 3, 2025

Model

Rated AC power350 kW
CEC weighted efficiency98.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 2 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
S6-GU250K-EHV-US-M12	250 kW	600 V	248.8 kW	248.8 kW	98.5%	860–1,300 V	Jul 21, 2025	SB
S6-GU350K-EHV-US-M12	350 kW	800 V	348.2 kW	348.2 kW	98.5%	860–1,300 V	Feb 3, 2025	SB

DC input (PV side)

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library

CEC test DC voltages (min / nom / max)860 / 1,080 / 1,300 V
DC input at rated output (CEC test)353.6 kW

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library

CEC weighted efficiency98.5%
Night-time standby (tare)15.36 W
Power to start converting1,088.9 W

CEC weighted efficiency is measured by an accredited lab at six power levels and three DC voltages — the number to compare between inverters.

Grid & smart-inverter certification

CEC Grid Support Inverter List (Oct 7, 2026)

UL 1741 SB (3rd ed.)Yes — CSA Group, certificate Aug 19, 2024
UL 1741 SA (SA8–SA13)1 of 2 models — CSA Group
Firmware tested (SA)A3
Volt-VAr with reactive power priority (SA13)1 of 2 models
Freq-Watt / Volt-Watt (SA14–15)1 of 2 models
Disable permit service / limit active power (SA17–18)1 of 2 models
CSIP (IEEE 2030.5) conformanceVia gateway during testing (Y*)
Monitor key data & scheduling (Rule 21 Phase 3)Yes (attested Jul 21, 2025)
CEC listedFeb 3, 2025

UL 1741 SB is required for new interconnections in California (Rule 21) since 2026.

Panel compatibility & string sizing

NLR SAM inverter library · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

S6-GU350K-EHV-US-M12: max DC 1,300 V · MPPT 860–1,300 V (CEC test window)

Most-permitted panels in Southern California

Panel	Power	Voc cold	Vmp hot	Panels per string	Installed together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410	410 W	48.1 V	30.6 V	no fit	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	no fit	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	no fit	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	no fit	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	no fit	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	31–31	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	31–31	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	31–31	—
REC Group REC460AA Pure-RX	460 W	68.8 V	47.1 V	no fit	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 V	25.3 V	no fit	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	31–31	—
Tesla TSP-420	420 W	43.4 V	27.7 V	no fit	—

Voltage check only, from CEC panel data and NLR weather for the city. Final design must follow the inverter manual and NEC 690.7.

About Solis (Ginlong Technologies)

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerSolis (Ginlong Technologies)
Listed in CEC asGinlong Technologies Co., Ltd.
Websitesolisinverters.com
Models on CEC lists145

Other series

Solis-xxK-5G-US · 3 permitsS5-GC60K-LV-USS6-GC30K-LV-USS6-GUxxxK-EHV-US-M16S5-GCxxK-USS6-GCxxK-USSolis-xxxK-EHV-5G-US-PLUSSolis-xxxK-EHV-5G-USSolis-xxK-US-F-LSWSolis-xxK-US-LSWSolis-xxxK1-EHV-5G

Questions & answers

How efficient is the Solis (Ginlong Technologies) S6-GUxxxK-EHV-US-M12?

The California Energy Commission lists a weighted efficiency of 98.5% for Solis (Ginlong Technologies) S6-GUxxxK-EHV-US-M12 models, measured at six power levels and three DC voltages.

What sizes does the Solis (Ginlong Technologies) S6-GUxxxK-EHV-US-M12 come in?

The CEC list includes 2 models from 250 kW to 350 kW AC: S6-GU250K-EHV-US-M12, S6-GU350K-EHV-US-M12.

Is the Solis (Ginlong Technologies) S6-GUxxxK-EHV-US-M12 certified to UL 1741 SB?

Yes — the CEC Grid Support Inverter List shows UL 1741 SB for all models.

What is the S6-GU350K-EHV-US-M12’s DC input voltage range?

CEC tested it at 860–1,300 V DC.

Sources

California Energy Commission — Grid Support Inverter List (solar and battery inverters), data as of Oct 7, 2026. Manufacturer-reported, confirmed by CEC against certificates and test reports.
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
California Energy Commission — PV Module List (module electrical data for the compatibility check).
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).