Illustration

String inverterCanadian Solar

Canadian Solar CSI-40K-T480GL01-UB

Name: Canadian Solar CSI-40K-T480GL01-UB
Brand: Canadian Solar

String inverter. 7 models, 25 kW–66 kW AC at 480 V.

CEC listed · Nov 23, 2020

Model

Rated AC power40 kW
CEC weighted efficiency98.5%

Models & power ratings

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

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
CSI-25K-T480GL01-UB	25 kW	480 V	25 kW	25 kW	98.5%	347–800 V	Nov 23, 2020	—
CSI-30K-T480GL01-UB	30 kW	480 V	29.9 kW	29.9 kW	98.5%	417–800 V	Nov 23, 2020	—
CSI-36K-T480GL01-UB	36 kW	480 V	35.9 kW	35.9 kW	98.5%	500–800 V	Nov 23, 2020	—
CSI-40K-T480GL01-UB	40 kW	480 V	39.9 kW	39.9 kW	98.5%	556–800 V	Nov 23, 2020	—
CSI-50K-T480GL01-UB	50 kW	480 V	49.9 kW	49.9 kW	98.5%	568–850 V	Nov 23, 2020	—
CSI-60K-T480GL01-UB	60 kW	480 V	59.9 kW	59.9 kW	98.5%	526–850 V	Nov 23, 2020	—
CSI-66K-T480GL01-UB	66 kW	480 V	65.9 kW	65.9 kW	98.5%	579–850 V	Nov 23, 2020	—

DC input (PV side)

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

CEC test DC voltages (min / nom / max)556 / 700 / 800 V
DC input at rated output (CEC test)40.6 kW

Efficiency

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

CEC weighted efficiency98.5%
Night-time standby (tare)1 W
Power to start converting58.4 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.)No
UL 1741 SA (SA8–SA13)Yes — Intertek
Firmware tested (SA)1D
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 Nov 23, 2020)
CEC listedNov 23, 2020
Last CEC updateDec 1, 2021

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

CSI-40K-T480GL01-UB: max DC 800 V · MPPT 556–800 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.

Compare with similar 40 kW inverters

CEC Grid Support Inverter List (Oct 7, 2026) · building permits

Inverter	Power	CEC weighted eff.	DC test window	UL 1741 SB	Latest CEC	SoCal permits
Canadian Solar CSI-xxK-T480GL01-UB	25 kW–66 kW	98.5%	556–800 V	—	2020	0
SolarEdge SExKUS	9 kW–330 kW	99.0%	100–1,400 V	16 of 19	2025	14
CPS (Chint Power Systems) CPS SCAxxKTL-DO/US-480	36 kW–60 kW	98.5%	400–850 V	Yes	2023	3
SMA STP xx-US-80	27.5 kW–70 kW	97.5%	300–850 V	Yes	2026	—
Yaskawa Solectria Solar PVI xxTL-480	36 kW–100 kW	98.5%	340–850 V	3 of 4	2025	—

Same type and grid voltage, power range covering this model; same fields from the same sources.

About Canadian Solar

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerCanadian Solar
Listed in CEC asCSI Solar Co., Ltd.
Websitecanadiansolar.com
Models on CEC lists592

Other series

CSI-xxK-T208GL03-UCSI-xxK-T480GL03-UCSI-xxxK-T600GL03-UCSI-xxxK-T800GL03-UCSI-xxxK-T600GL02-UCSI-xxxK-T800GL02-UCSI-xxK-T480GL02-U

Documents

manufacturer documents

PDF
CSI-125-255K-T600-800
Datasheet · Canadian Solar (CSI Solar) · Mar 2023
PDF
KuBank 2.0
Datasheet · Canadian Solar (CSI Solar) · Jul 2025
PDF
String Inverters, Three Phase, 1500 V 350KW
Datasheet · Canadian Solar (CSI Solar) · Apr 2025
PDF
CSI-10K-T4002A-E
Datasheet · Canadian Solar (CSI Solar) · Apr 2025
PDF
CSI-15K-T400| CSI-17K-T400| CSI-20K-T400| CSI-23K-T400| CSI-25K-T400
Datasheet · Canadian Solar (CSI Solar) · Feb 2024
PDF
CSI-40K-T400| CSI-50K-T400| CSI-60K-T400
Datasheet · Canadian Solar (CSI Solar) · Apr 2025
PDF
CSI-75K-T40001-E| CSI-100K-T4001A-E|CSI-100K-T4001B-E| CSI-110K-T4001A-E|CSI-110K-T4001B-E|CSI-120K-T4001A-E|CSI-120K-T4001B-E
Datasheet · Canadian Solar (CSI Solar) · Apr 2025
PDF
CSI-75K-T400| CSI-100K-T400| CSI-110K-T400| CSI-120K-T400
Datasheet · Canadian Solar (CSI Solar) · Feb 2024

Questions & answers

How efficient is the Canadian Solar CSI-xxK-T480GL01-UB?

The California Energy Commission lists a weighted efficiency of 98.5% for Canadian Solar CSI-xxK-T480GL01-UB models, measured at six power levels and three DC voltages.

What sizes does the Canadian Solar CSI-xxK-T480GL01-UB come in?

The CEC list includes 7 models from 25 kW to 66 kW AC: CSI-25K-T480GL01-UB, CSI-30K-T480GL01-UB, CSI-36K-T480GL01-UB, CSI-40K-T480GL01-UB, CSI-50K-T480GL01-UB, CSI-60K-T480GL01-UB, CSI-66K-T480GL01-UB.

Is the Canadian Solar CSI-xxK-T480GL01-UB certified to UL 1741 SB?

The CEC list does not show UL 1741 SB certification for these models.

What is the CSI-40K-T480GL01-UB’s DC input voltage range?

CEC tested it at 556–800 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.
Canadian Solar — document library on the manufacturer’s website (links above).
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).
Building permits — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).