CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ
−0.296 %/°C
Voc coefficient β
−0.231 %/°C
Isc coefficient α
+0.057 %/°C
Operating cell temperature
NOCT 45.8 °C
Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.
Away from lab conditions — CEC listing test points
Class
Pmax at NOCT
Vmp × Imp at NOCT
Pmax at 200 W/m²
Low-light efficiency vs STC
465 W
349.4 W
33.75 V × 10.35 A
88.9 W
96%
470 W
353 W
33.84 V × 10.43 A
89.8 W
96%
475 W
356.7 W
33.94 V × 10.51 A
90.8 W
96%
480 W
360.4 W
34.03 V × 10.59 A
91.7 W
96%
485 W
364.1 W
34.12 V × 10.67 A
92.7 W
96%
490 W
367.9 W
34.22 V × 10.75 A
93.6 W
96%
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).
Certifications
CEC PV Module List (Oct 7, 2026)
UL 61730IEC 61215
UL 61730CEC listing
IEC 61215design qualification on file with CEC · Dec 30, 2020
Independent reliability testing
Kiwa PVEL Scorecard · RETC PV Module Index
2022
PVEL Top Performer
this series
5
Tests passed as Top Performer
DH, LID+LETID, MSS, PID, TC
12
PVEL Scorecards
Trina Solar named Top Performer, 2014–2026
2023, 2024, 2025, 2026
RETC Overall Highest Achiever
Trina Solar, manufacturer level
PVEL Top Performer tests
Year
Product
Tests
2022
TSM-xxxDEG15VC.20(II)
DHLID+LETIDMSSPIDTC
Tested bill of materials
Cell technology (tested BOM)p-type PERC
Module design (tested BOM)Bifacial - glass//glass
Power class range tested455-500W
Details describe the tested sample, not every module of the series.
RETC PV Module Index — Trina Solar
Year
Recognition
2023
Overall Highest Achiever; High Achievement in Performance (Ptc-to-stc ratio, Module efficiency, LeTID RESISTANCE); High Achievement in Quality (Hail durability test); High Achievement in Reliability (Thermal cycle test, SDML, Pid resistance, Damp heat test)
2024
Overall Highest Achiever
2025
Overall Highest Achiever
2026
Overall Highest Achiever; High achievement in performance; High achievement in reliability; Performance discipline high achiever (Temperature coefficient, Iam, Letid, PAN file); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Damp heat, Pid, Sdml, Tc)
Inverter compatibility & string sizing
CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)
45.4 V
Voc when cold
per panel
29.7 V
Vmp when hot
per panel
13
Max panels / string
max DC 600 V
3
Min panels / string
MPPT from 60 V
Defaults come from NLR TMY weather (coldest hour, hottest modeled cell). Code calculations (NEC 690.7) use the ASHRAE extreme annual minimum, which is usually colder — enter it above. β is the CEC-measured coefficient; NEC 690.7 calculations use the datasheet value.
String inverters most named in SoCal permits
Inverter
Max DC input
MPPT
Window source
Panels per string
Tesla 1538000-xx-y
600 V
60–480 V
datasheet
3–13
Solis (Ginlong) S6-EH1P10K-H-US
600 V
80–520 V
datasheet
3–13
Solis (Ginlong) Solis-1P7.6K-4G-US
600 V
100–500 V
datasheet
4–13
Qcells Q.VOLT H7.6SX
498 V
234–498 V
CEC test window
8–10
Microinverters (one per panel)
Microinverter
Recommended module power
Max DC input
MPPT
Voc cold / Vmp hot
Check
DC/AC
Enphase IQ8X-80-M-US
320–540 W
79.5 V
43–60 V
45.4 / 29.7 V
✗ Not a match: module voltage below MPPT range
1.24
APsystems (Alt Power System) DS3-L
265–570 W
60 V
28–45 V
45.4 / 29.7 V
✓ Within range
0.6
Enphase IQ8A-72-2-US
295–500 W
60 V
32–45 V
45.4 / 29.7 V
⚠ Works; below MPPT at peak heat
1.35
Voltage check against the microinverter datasheets — confirm the pairing on the manufacturer’s module compatibility list. Rows appear only when the panel’s power is inside the microinverter’s recommended module power range.
SolarEdge and other optimizer-based systems size strings by the optimizer rules — use the manufacturer’s designer. Reference inverters: most named in SoCal permits since Oct 2024.
Expected production in Southern California
NLR PVWatts v8 · Cali-Graf calculation
City
kWh / kW / yr
kWh / panel / yr
kWh / system / yr
Sun, kWh/m²/day
Los Angeles
1,676
788
11,816
6.08
Palmdale
1,835
862
12,937
6.69
Chula Vista
1,696
797
11,957
6.11
Huntington Beach
1,643
772
11,583
5.89
Riverside
1,696
797
11,957
6.21
Santa Clarita
1,724
810
12,154
6.28
Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.
Compare with similar 470 W panels
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · datasheets · building permits
Panel
Pmax
Efficiency
γ Pmax (CEC)
Voc, V
Isc, A
PVEL (product / brand)
SoCal permits (series)
Trina Solar TSM-470DEG15VC.20(II)
470 W
≈20.2%
−0.296
43.1
13.68
product 2022
—
REC Group REC470AA Pure-RX
470 W
≈23.3%
−0.248
65.7
8.95
brand 9× (2016–2025)
33
Aptos Solar DNA-120-MF10-465W
465 W
≈21.5%
−0.363
41.9
14.07
—
22
Canadian Solar CS6.1-54TM-465H
465 W
≥22.8%
−0.308
39.5
14.77
product 2024, 2025
9
Same fields from the same sources for every row; ≈ efficiency is calculated from the listed area. Comparable series: other brands, same product group, power range covering this class.
About Trina Solar
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · RETC PV Module Index · building permits
How efficient is the Trina Solar TSM-470DEG15VC.20(II)?
Calculated from the panel area (2.33 m²): about 20.2% for the 470 W class. 470 W over 2.33 m² equals about 202 W per square meter.
How much energy does one panel produce in Los Angeles or Palmdale?
PVWatts v8 with typical-year weather gives about 788 kWh per year per 470 W panel in Los Angeles and about 862 kWh in Palmdale (20° roof, facing south, 14% system losses).
How much power does it lose on a hot roof?
With γ = −0.296 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.3% below the STC rating.
How many panels fit on one string?
With the Tesla 1538000-xx-y (max DC 600 V, MPPT from 60 V, datasheet) in Los Angeles the calculator gives 3–13 panels per string (Voc at 2 °C = 45.4 V, Vmp at 74 °C cell = 29.7 V). Final design must follow the inverter manual and NEC 690.7.
Does it work with APsystems (Alt Power System) DS3-L microinverters?
Voltage check against the APsystems (Alt Power System) datasheet: Voc when cold 45.4 V vs max input 60 V; Vmp when hot 29.7 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.
Has this panel been reliability-tested?
TSM-xxxDEG15VC.20(II) was a PVEL Top Performer in 2022 (DH, LID+LETID, MSS, PID, TC).
Sources
California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
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, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
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).
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