CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ
−0.363 %/°C
Voc coefficient β
−0.270 %/°C
Isc coefficient α
+0.039 %/°C
Operating cell temperature
NOCT 44.5 °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
360 W
269.9 W
37.08 V × 7.28 A
69.9 W
97%
365 W
273.6 W
37.27 V × 7.34 A
70.9 W
97%
370 W
277.4 W
37.46 V × 7.4 A
71.8 W
97%
375 W
281.1 W
37.65 V × 7.47 A
72.8 W
97%
380 W
281.8 W
36.93 V × 7.63 A
73.9 W
97%
385 W
285.3 W
37.12 V × 7.69 A
74.9 W
97%
390 W
289.1 W
37.3 V × 7.75 A
75.9 W
97%
395 W
292.9 W
37.49 V × 7.81 A
76.9 W
97%
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
2021
PVEL Top Performer
closely related product name
1
Tests passed as Top Performer
DH
6
PVEL Scorecards
VSUN (Vietnam Sunergy) named Top Performer, 2021–2026
2025, 2026
RETC Overall Highest Achiever
VSUN (Vietnam Sunergy), manufacturer level
PVEL Top Performer tests
Year
Product
Tests
2021
VSUNxxx-72MH (closely related product name)
DH
RETC PV Module Index — VSUN (Vietnam Sunergy)
Year
Recognition
2024
Test Category High Achiever
2025
Overall Highest Achiever
2026
Overall Highest Achiever; High achievement in performance; High achievement in reliability; Performance discipline high achiever (Lid, PAN file, Temperature coefficient, Iam, Letid); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Damp heat, Pid, Sdml, Tc, Uvid)
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)
51.3 V
Voc when cold
per panel
32 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
4–11
Qcells Q.VOLT H7.6SX
498 V
234–498 V
CEC test window
8–9
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
51.3 / 32 V
✓ Within range
1.29
Enphase IQ8X-80-M-US
320–540 W
79.5 V
43–60 V
51.3 / 32 V
✗ Not a match: module voltage below MPPT range
0.99
APsystems (Alt Power System) DS3-L
265–570 W
60 V
28–45 V
51.3 / 32 V
✓ Within range
0.48
Enphase IQ8M-72-2-US
260–460 W
60 V
30–45 V
51.3 / 32 V
✓ Within range
1.15
Enphase IQ8A-72-2-US
295–500 W
60 V
32–45 V
51.3 / 32 V
⚠ Works; below MPPT at peak heat
1.07
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
628
11,942
6.08
Palmdale
1,835
688
13,074
6.69
Chula Vista
1,696
636
12,084
6.11
Huntington Beach
1,643
616
11,706
5.89
Riverside
1,696
636
12,084
6.21
Santa Clarita
1,724
646
12,284
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 375 W panels
CEC PV Module List (Oct 7, 2026) · Qcells datasheet · Kiwa PVEL Scorecard · building permits
Panel
Pmax
Efficiency
γ Pmax (CEC)
Voc, V
Isc, A
PVEL (product / brand)
SoCal permits (series)
VSUN (Vietnam Sunergy) VSUN375-72M
375 W
≈19.5%
−0.363
48.3
9.92
brand 6×
—
Qcells Q.PEAK DUO BLK ML-G10+ 380
380 W
≈19.4%
−0.362
45.16
11.01
product 2022, 2023
221
LONGi LR4-60HPB-370M
370 W
≈20.9%
−0.339
41.2
11.5
product 2021, 2022
193
REC Group REC380AA Pure
380 W
≈21.2%
−0.256
48.4
10.17
brand 9× (2016–2025)
66
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 VSUN (Vietnam Sunergy)
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · RETC PV Module Index · building permits
ManufacturerVSUN (Vietnam Sunergy)
Listed in CEC asVietnam Sunergy Joint Stock Company
How efficient is the VSUN (Vietnam Sunergy) VSUN375-72M?
Calculated from the panel area (1.94 m²): about 19.5% for the 375 W class. 375 W over 1.94 m² equals about 193 W per square meter.
How much energy does one panel produce in Los Angeles or Palmdale?
PVWatts v8 with typical-year weather gives about 628 kWh per year per 375 W panel in Los Angeles and about 688 kWh in Palmdale (20° roof, facing south, 14% system losses).
How much power does it lose on a hot roof?
With γ = −0.363 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.8% 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 = 51.3 V, Vmp at 74 °C cell = 32 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 51.3 V vs max input 60 V; Vmp when hot 32 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?
VSUNxxx-72MH was a PVEL Top Performer in 2021 (DH) — a closely related product name.
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”.
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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