CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ
−0.234 %/°C
Voc coefficient β
−0.235 %/°C
Isc coefficient α
+0.037 %/°C
Operating cell temperature
NOCT 43.4 °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
400 W
307.9 W
39.49 V × 7.8 A
76.3 W
95%
410 W
315.5 W
39.97 V × 7.89 A
78.2 W
95%
420 W
323.3 W
40.54 V × 7.97 A
80.1 W
95%
430 W
330.8 W
41.12 V × 8.05 A
82 W
95%
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
9
PVEL Scorecards
REC Group named Top Performer, 2016–2025
3
RETC PV Module Index
REC Group recognized 2023–2025
This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.
RETC PV Module Index — REC Group
Year
Recognition
2023
High Achievement in Performance (Ptc-to-stc ratio, Module efficiency)
2024
High Achievement in Performance
2025
Test Category High Achiever
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)
51.4 V
Voc when cold
per panel
36.6 V
Vmp when hot
per panel
11
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
2–11
Solis (Ginlong) S6-EH1P10K-H-US
600 V
80–520 V
datasheet
3–11
Solis (Ginlong) Solis-1P7.6K-4G-US
600 V
100–500 V
datasheet
3–11
Qcells Q.VOLT H7.6SX
498 V
234–498 V
CEC test window
7–9
Microinverters (one per panel)
Microinverter
Recommended module power
Max DC input
MPPT
Voc cold / Vmp hot
Check
DC/AC
Enphase IQ8PLUS-72-2-US
235–440 W
60 V
29–45 V
51.4 / 36.6 V
✓ Within range
1.45
Enphase IQ8X-80-M-US
320–540 W
79.5 V
43–60 V
51.4 / 36.6 V
✗ Not a match: module voltage below MPPT range
1.11
APsystems (Alt Power System) DS3-L
265–570 W
60 V
28–45 V
51.4 / 36.6 V
✓ Within range
0.54
Enphase IQ8M-72-2-US
260–460 W
60 V
30–45 V
51.4 / 36.6 V
✓ Within range
1.29
Enphase IQ8A-72-2-US
295–500 W
60 V
32–45 V
51.4 / 36.6 V
✓ Within range
1.2
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
704
11,967
6.08
Palmdale
1,835
771
13,102
6.69
Chula Vista
1,696
712
12,109
6.11
Huntington Beach
1,643
690
11,731
5.89
Riverside
1,696
712
12,109
6.21
Santa Clarita
1,724
724
12,309
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.
Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.
Installed together with
building permits
Microinverters
Enphase IQ8M
2
Batteries
Enphase IQ Battery 5P
2
Number of permits naming both this panel series and the product; 3 of 6 permits list other equipment.
Compare with similar 420 W panels
CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard · building permits
Panel
Pmax
Efficiency
γ Pmax (CEC)
Voc, V
Isc, A
PVEL (product / brand)
SoCal permits (series)
REC Group REC420AA Pure 2
420 W
≈22.3%
−0.234
48.8
10.74
brand 9×
6
Qcells Q.PEAK DUO BLK ML-G10+ 415
415 W
≈21.1%
−0.337
45.41
11.23
product 2022, 2023
221
LONGi LR5-54HABB-415M
415 W
≈21.8%
−0.342
37.77
13.94
brand 9× (2017–2026)
64
Canadian Solar CS3N-420MS
420 W
≥20.7%
−0.332
45.3
11.74
product 2023
46
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 REC Group
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · RETC PV Module Index · building permits
ManufacturerREC Group
Listed in CEC asREC Group
PVEL Top Performer (manufacturer)9 Scorecards (2016–2025)
RETC PV Module Index2023, 2024, 2025
Current panel series in CEC list26
Other series by SoCal permits
RECxxxAA Pure · 66RECxxxAA Pure-RX · 33RECxxxAA · 30RECxxxAA Black · 8RECxxxNP3 Black · 7RECxxxNP · 4
Questions & answers
How efficient is the REC Group REC420AA Pure 2?
Calculated from the panel area (1.88 m²): about 22.3% for the 420 W class. 420 W over 1.88 m² equals about 223 W per square meter.
How much energy does one panel produce in Los Angeles or Palmdale?
PVWatts v8 with typical-year weather gives about 704 kWh per year per 420 W panel in Los Angeles and about 771 kWh in Palmdale (20° roof, facing south, 14% system losses).
How much power does it lose on a hot roof?
With γ = −0.234 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 12.1% 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 2–11 panels per string (Voc at 2 °C = 51.4 V, Vmp at 74 °C cell = 36.6 V). Final design must follow the inverter manual and NEC 690.7.
Does it work with Enphase IQ8PLUS-72-2-US microinverters?
Voltage check against the Enphase datasheet: Voc when cold 51.4 V vs max input 60 V; Vmp when hot 36.6 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.
Has this panel been reliability-tested?
This exact series is not in published PVEL Top Performer tables; REC Group was named a Top Performer in 9 Scorecards (2016–2025).
Who installs it in Southern California?
Building permits name this series 6 times (Aug 2023 – Aug 2025). The most active licensed installers are G C Electric Solar.
Sources
California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Aug 2023 – Jul 2025); City of Huntington Beach (Aug 2025). Equipment matched from permit descriptions by model number.
Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
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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