Cali-Graf in Southern California

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String inverterCPS (Chint Power Systems)

CPS (Chint Power Systems) CPS SCH320KTL-DO/US-800

String inverter. 3 models, 275 kW–350 kW AC at 800 V.

UL 1741 SBCEC listed · Feb 1, 2022

Model

Rated AC power320 kW
CEC weighted efficiency98.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 3 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
CPS SCH275KTL-DO/US-800	275 kW	800 V	275 kW	275 kW	98.5%	900–1,300 V	Feb 1, 2022	SB
CPS SCH320KTL-DO/US-800	320 kW	800 V	320 kW	320 kW	98.5%	880–1,300 V	Nov 1, 2023	SB
CPS SCH350KTL-DO/US-800	350 kW	800 V	350 kW	350 kW	98.5%	880–1,300 V	Nov 1, 2023	SB

DC input (PV side)

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

CEC test DC voltages (min / nom / max)880 / 1,190 / 1,300 V
DC input at rated output (CEC test)325.5 kW

Efficiency

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

CEC weighted efficiency98.5%
Night-time standby (tare)15 W
Power to start converting572.4 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 May 6, 2024
UL 1741 SA (SA8–SA13)Yes — CSA Group
Firmware tested (SA)01.00, 1.01.00
Volt-VAr with reactive power priority (SA13)Yes
Freq-Watt / Volt-Watt (SA14–15)Yes
Disable permit service / limit active power (SA17–18)Yes
CSIP (IEEE 2030.5) conformanceVia gateway during testing (Y*)
Monitor key data & scheduling (Rule 21 Phase 3)Yes (attested Jul 1, 2024)
CEC listedFeb 1, 2022
Last CEC updateJul 1, 2024

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

CPS SCH320KTL-DO/US-800: max DC 1,300 V · MPPT 880–1,300 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	no fit	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	no fit	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	no fit	—
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	no fit	—
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 CPS (Chint Power Systems)

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerCPS (Chint Power Systems)
Listed in CEC asChint Power Systems America
Websitechintpower.com
Models on CEC lists175

Other series

CPS SCAxxKTL-DO/US-480 · 3 permitsCPS SCAxxKTL-DO-R/US-480 · 1 permitsCPS SCAxxKTL-DO/US-208 · 1 permitsSCAxxK-T-US-208SCAxxxK-T-US-480SCHxxxK-T-US-480SCHxxxK-T-US-600CPS SCHxxxKTL-DO/US-480

Questions & answers

How efficient is the CPS (Chint Power Systems) CPS SCHxxxKTL-DO/US-800?

The California Energy Commission lists a weighted efficiency of 98.5% for CPS (Chint Power Systems) CPS SCHxxxKTL-DO/US-800 models, measured at six power levels and three DC voltages.

What sizes does the CPS (Chint Power Systems) CPS SCHxxxKTL-DO/US-800 come in?

The CEC list includes 3 models from 275 kW to 350 kW AC: CPS SCH275KTL-DO/US-800, CPS SCH320KTL-DO/US-800, CPS SCH350KTL-DO/US-800.

Is the CPS (Chint Power Systems) CPS SCHxxxKTL-DO/US-800 certified to UL 1741 SB?

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

What is the CPS SCH320KTL-DO/US-800’s DC input voltage range?

CEC tested it at 880–1,300 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).