CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ
−0.360 %/°C
Voc coefficient β
−0.260 %/°C
Isc coefficient α
+0.035 %/°C
Operating cell temperature
NOCT 46.1 °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
570 W
415.2 W
40.75 V × 10.19 A
—
—
575 W
418.9 W
40.95 V × 10.23 A
—
—
580 W
422.6 W
41.15 V × 10.27 A
—
—
585 W
426.3 W
41.35 V × 10.31 A
—
—
590 W
429.6 W
41.55 V × 10.34 A
—
—
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).
Independent reliability testing
Kiwa PVEL Scorecard · RETC PV Module Index
2023
PVEL Top Performer
closely related product name
4
Tests passed as Top Performer
DH, LID+LETID, MSS, TC
11
PVEL Scorecards
Qcells named Top Performer, 2016–2026
2023, 2026
RETC Overall Highest Achiever
Qcells, manufacturer level
PVEL Top Performer tests
Year
Product
Tests
2023
Q.PEAK DUO XL-G11.3/BFG (closely related product name)
DHLID+LETIDMSSTC
Tested bill of materials
PVEL-tested factorySouth Korea
Cell technology (tested BOM)p-type PERC
Module design (tested BOM)bifacial - glass//glass
Power class range tested580-625W
Details describe the tested sample, not every module of the series.
RETC PV Module Index — Qcells
Year
Recognition
2023
Overall Highest Achiever; High Achievement in Performance (Module efficiency, Pan file performance); High Achievement in Reliability (Damp heat test, Pid resistance, Thermal cycle test)
2024
High Achievement in Performance
2025
Performance High Achiever
2026
Overall Highest Achiever; High achievement in performance; High achievement in reliability; Performance discipline high achiever (Conversion efficiency, Iam, Letid, Lid, PTC-to-STC, Temperature coefficient); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Sdml, Tc, Uvid, Budt, Damp heat, Hdt, Pid)
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)
56.8 V
Voc when cold
per panel
36.2 V
Vmp when hot
per panel
10
Max panels / string
max DC 600 V
2
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
2–10
Solis (Ginlong) S6-EH1P10K-H-US
600 V
80–520 V
datasheet
3–10
Solis (Ginlong) Solis-1P7.6K-4G-US
600 V
100–500 V
datasheet
3–10
Qcells Q.VOLT H7.6SX
498 V
234–498 V
CEC test window
7–8
Microinverters (one per panel)
No microinverter in the reference set lists this power class in its recommended module power range.
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
972
11,665
6.08
Palmdale
1,835
1,064
12,772
6.69
Chula Vista
1,696
984
11,804
6.11
Huntington Beach
1,643
953
11,435
5.89
Riverside
1,696
984
11,804
6.21
Santa Clarita
1,724
1,000
11,999
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 580 W panels
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · building permits
Panel
Pmax
Efficiency
γ Pmax (CEC)
Voc, V
Isc, A
PVEL (product / brand)
SoCal permits (series)
Qcells Q.PEAK DUO XL-G11.3 580
580 W
≈23%
−0.360
53.64
13.54
brand 11×
—
ZNShine Solar ZXM7-UHLDD144-580/N
580 W
≈22.7%
−0.281
51.5
14.35
product 2024, 2025, 2026
1
VSUN (Vietnam Sunergy) VSUN580N-144MH
580 W
≈22.5%
−0.309
52.02
13.83
brand 6× (2021–2026)
1
Phono Solar PS580M8GFH-24/TNH
580 W
≈22.7%
−0.293
52.7
13.66
product 2024, 2025
1
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 Qcells
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · RETC PV Module Index · building permits
ManufacturerQcells
Listed in CEC asHanwha Qcells (Qidong) Co. Ltd., Qcells North America
How efficient is the Qcells Q.PEAK DUO XL-G11.3 580?
Calculated from the panel area (2.52 m²): about 23% for the 580 W class. 580 W over 2.52 m² equals about 230 W per square meter.
How much energy does one panel produce in Los Angeles or Palmdale?
PVWatts v8 with typical-year weather gives about 972 kWh per year per 580 W panel in Los Angeles and about 1,064 kWh in Palmdale (20° roof, facing south, 14% system losses).
How much power does it lose on a hot roof?
With γ = −0.360 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.7% 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 2–10 panels per string (Voc at 2 °C = 56.8 V, Vmp at 74 °C cell = 36.2 V). Final design must follow the inverter manual and NEC 690.7.
Has this panel been reliability-tested?
Q.PEAK DUO XL-G11.3/BFG was a PVEL Top Performer in 2023 (DH, LID+LETID, MSS, TC) — a closely related product name.
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 — 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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