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String inverterCanadian Solar

Canadian Solar CSI-50K-T480GL03-U

String inverter. 11 models, 25 kW–100 kW AC at 480 V.

UL 1741 SBCEC listed · May 1, 2023
Model
  • Rated AC power50 kW
  • CEC weighted efficiency98.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 11 models
ModelNominal ACGrid voltageCEC continuousRated AC (SAM)CEC weighted eff.DC test windowCEC listedUL 1741 SB
CSI-25K-T480GL03-U25 kW480 V24.9 kW24.9 kW98.5%580–850 VJan 11, 2024SB
CSI-30K-T480GL03-U30 kW480 V29.9 kW29.9 kW98.5%580–850 VJan 11, 2024SB
CSI-33K-T480GL03-U33 kW480 V32.9 kW32.9 kW98.5%580–850 VJan 11, 2024SB
CSI-36K-T480GL03-U36 kW480 V35.9 kW35.9 kW98.5%580–850 VJan 11, 2024SB
CSI-40K-T480GL03-U40 kW480 V39.8 kW39.8 kW98.5%580–850 VJan 11, 2024SB
CSI-50K-T480GL03-U50 kW480 V49.8 kW49.8 kW98.5%580–850 VJan 11, 2024SB
CSI-60K-T480GL03-U60 kW480 V59.9 kW59.9 kW98.5%580–850 VJan 11, 2024SB
CSI-75K-T480GL03-U75 kW480 V74.6 kW74.6 kW98.5%550–850 VMay 1, 2023SB
CSI-80K-T480GL03-U85 kW480 V79.4 kW79.4 kW98.5%550–850 VMay 1, 2023SB
CSI-90K-T480GL03-U90 kW480 V89.4 kW89.4 kW98.0%550–850 VMay 1, 2023SB
CSI-100K-T480GL03-U100 kW480 V99.4 kW99.4 kW98.0%550–850 VMay 1, 2023SB

DC input (PV side)

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

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library
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 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
CSI-50K-T480GL03-U: max DC 850 V · MPPT 580–850 V (CEC test window)

Most-permitted panels in Southern California

PanelPowerVoc coldVmp hotPanels per stringInstalled together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410410 W48.1 V30.6 Vno fit—
Qcells Q.PEAK DUO BLK ML-G10+ 410410 W48.1 V30.6 Vno fit—
LONGi LR5-54HABB-400M400 W39.3 V25.3 Vno fit—
JA Solar JAM54S31-405/MR405 W39.4 V25.5 Vno fit—
Hyundai Solutions HiN-T440NF(BK)440 W40.9 V27 Vno fit—
Silfab Solar SIL-440QD440 W41.1 V28 Vno fit—
Qcells Q.TRON BLK M-G2+ 430430 W41.3 V28 Vno fit—
Qcells Q.TRON BLK M-G2.H+ 430430 W41.3 V28 Vno fit—
REC Group REC460AA Pure-RX460 W68.8 V47.1 Vno fit—
Elin (Sirius PV) ELNSM54M-HC-410410 W39.3 V25.3 Vno fit—
Qcells Q.TRON BLK M-G2.C+ 430430 W41.3 V28 Vno fit—
Tesla TSP-420420 W43.4 V27.7 Vno 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 50 kW inverters

CEC Grid Support Inverter List (Oct 7, 2026) · building permits
InverterPowerCEC weighted eff.DC test windowUL 1741 SBLatest CECSoCal permits
Canadian Solar CSI-xxK-T480GL03-U25 kW–100 kW98.5%580–850 VYes20240
SolarEdge SExKUS9 kW–330 kW99.0%100–1,400 V16 of 19202514
CPS (Chint Power Systems) CPS SCAxxKTL-DO/US-48036 kW–60 kW98.5%400–850 VYes20233
SMA STP xx-US-8027.5 kW–70 kW97.5%300–850 VYes2026—
Yaskawa Solectria Solar PVI xxTL-48036 kW–100 kW98.5%340–850 V3 of 42025—
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)

Other series

CSI-xxK-T208GL03-UCSI-xxxK-T600GL03-UCSI-xxxK-T800GL03-UCSI-xxxK-T600GL02-UCSI-xxxK-T800GL02-UCSI-xxK-T480GL01-UBCSI-xxK-T480GL02-U

Documents

manufacturer documents

Questions & answers

How efficient is the Canadian Solar CSI-xxK-T480GL03-U?

The California Energy Commission lists a weighted efficiency of 98.0–98.5% for Canadian Solar CSI-xxK-T480GL03-U models, measured at six power levels and three DC voltages.

What sizes does the Canadian Solar CSI-xxK-T480GL03-U come in?

The CEC list includes 11 models from 25 kW to 100 kW AC: CSI-25K-T480GL03-U, CSI-30K-T480GL03-U, CSI-33K-T480GL03-U, CSI-36K-T480GL03-U, CSI-40K-T480GL03-U, CSI-50K-T480GL03-U, CSI-60K-T480GL03-U, CSI-75K-T480GL03-U….

Is the Canadian Solar CSI-xxK-T480GL03-U certified to UL 1741 SB?

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

What is the CSI-50K-T480GL03-U’s DC input voltage range?

CEC tested it at 580–850 V DC.

Sources

  1. 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.
  2. Canadian Solar — document library on the manufacturer’s website (links above).
  3. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  4. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
  5. California Energy Commission — PV Module List (module electrical data for the compatibility check).
  6. Building permits — Southern California permit portals. Equipment matched from permit descriptions.
  7. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).