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String inverterCanadian Solar

Canadian Solar CSI-30K-T208GL03-U

String inverter. 1 model, 30 kW AC at 208 V.

UL 1741 SBCEC listed · Jan 11, 2024
  • Rated AC power30 kW
  • CEC weighted efficiency97.0%

DC input (PV side)

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

AC output (grid side)

CEC Grid Support Inverter List (Oct 7, 2026)

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-30K-T208GL03-U: max DC 680 V · MPPT 340–680 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 V12–14—
Qcells Q.PEAK DUO BLK ML-G10+ 410410 W48.1 V30.6 V12–14—
LONGi LR5-54HABB-400M400 W39.3 V25.3 V14–17—
JA Solar JAM54S31-405/MR405 W39.4 V25.5 V14–17—
Hyundai Solutions HiN-T440NF(BK)440 W40.9 V27 V13–16—
Silfab Solar SIL-440QD440 W41.1 V28 V13–16—
Qcells Q.TRON BLK M-G2+ 430430 W41.3 V28 V13–16—
Qcells Q.TRON BLK M-G2.H+ 430430 W41.3 V28 V13–16—
REC Group REC460AA Pure-RX460 W68.8 V47.1 V8–9—
Elin (Sirius PV) ELNSM54M-HC-410410 W39.3 V25.3 V14–17—
Qcells Q.TRON BLK M-G2.C+ 430430 W41.3 V28 V13–16—
Tesla TSP-420420 W43.4 V27.7 V13–15—
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 30 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-T208GL03-U30 kW–30 kW97.0%340–680 VYes20240
SolarEdge SExKUS9 kW–330 kW99.0%100–1,400 V16 of 19202514
CPS (Chint Power Systems) CPS SCAxxKTL-DO/US-20825 kW–25 kW96.5%480–850 VYes20201
SMA STP xx-US-8027.5 kW–70 kW97.5%300–850 VYes2026—
Yaskawa Solectria Solar PVI-xxTL-20825 kW–50 kW96.5%200–850 VYes2025—
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-T480GL03-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-T208GL03-U?

The California Energy Commission lists a weighted efficiency of 97.0% for Canadian Solar CSI-xxK-T208GL03-U models, measured at six power levels and three DC voltages.

Is the Canadian Solar CSI-xxK-T208GL03-U certified to UL 1741 SB?

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

What is the CSI-30K-T208GL03-U’s DC input voltage range?

CEC tested it at 340–680 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).