Illustration · 132 half-cut cells

Solar panelQcells

Qcells Q.PEAK DUO ML-G9+ 390

Name: Qcells Q.PEAK DUO ML-G9+ 390
Brand: Qcells

132 half-cut cells. Power classes 355–400 W in the CEC list.

CEC listed · Oct 12, 2020UL 61730Seen in 1 SoCal permit

Power class

Power (STC)390 WCEC nameplate
Efficiency≈21.4%calculated from area
%/°C Pmax−0.373CEC listing test
PTC / STC92.5%PTC 361 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 10 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
Q.PEAK DUO ML-G9+ 355	355 W	44.81	10.49	36.03	9.85	≈19.5%	328 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 360	360 W	44.85	10.52	36.32	9.91	≈19.8%	332 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 365	365 W	44.89	10.55	36.61	9.97	≈20.1%	337 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 370	370 W	44.92	10.58	36.90	10.03	≈20.3%	342 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 375	375 W	44.96	10.62	37.18	10.09	≈20.6%	346 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 380	380 W	44.99	10.65	37.46	10.14	≈20.9%	351 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 385	385 W	45.03	10.68	37.74	10.20	≈21.2%	356 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 390	390 W	45.06	10.71	38.01	10.26	≈21.4%	361 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 395	395 W	45.10	10.74	38.29	10.32	≈21.7%	366 W	Oct 12, 2020
Q.PEAK DUO ML-G9+ 400	400 W	45.14	10.77	38.55	10.38	≈22.0%	370 W	Oct 12, 2020

≈ efficiency = Pmax ÷ CEC-listed area 1.82 m².

CEC note: Formerly listed under Hanwha Q CELLS

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.82 m² (19.6 ft²)CEC-listed area
Cells132 half-cut cells
Back coverWhite backsheet

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation

	CEC listing test
Pmax coefficient γ	−0.373 %/°C
Voc coefficient β	−0.311 %/°C
Isc coefficient α	+0.081 %/°C
Operating cell temperature	NOCT 46.3 °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
355 W	256.7 W	32.83 V × 7.82 A	69.7 W	98%
360 W	260.3 W	33.09 V × 7.87 A	70.7 W	98%
365 W	264 W	33.36 V × 7.92 A	71.7 W	98%
370 W	267.7 W	33.62 V × 7.96 A	72.7 W	98%
375 W	271.3 W	33.87 V × 8.01 A	73.7 W	98%
380 W	276.1 W	34.13 V × 8.09 A	74.6 W	98%
385 W	278.4 W	34.39 V × 8.1 A	75.6 W	98%
390 W	282.1 W	34.63 V × 8.15 A	76.6 W	98%
395 W	285.8 W	34.89 V × 8.19 A	77.6 W	98%
400 W	289.4 W	35.12 V × 8.24 A	78.6 W	98%

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

PVEL Scorecards

Qcells named Top Performer, 2016–2026

2023, 2026

RETC Overall Highest Achiever

Qcells, manufacturer level

This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

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)

CityColdest air, °CHottest cell, °CString inverter

48.3 V

Voc when cold

per panel

29.6 V

Vmp when hot

per panel

Max panels / string

max DC 600 V

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	3–12
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–12
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–12
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 IQ8PLUS-72-2-US	235–440 W	60 V	29–45 V	48.3 / 29.6 V	✓ Within range	1.34
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	48.3 / 29.6 V	✗ Not a match: module voltage below MPPT range	1.03
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	48.3 / 29.6 V	✓ Within range	0.5
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	48.3 / 29.6 V	⚠ Works; below MPPT at peak heat	1.2
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	48.3 / 29.6 V	⚠ Works; below MPPT at peak heat	1.12

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

PanelsCity for chartSystem size

City	kWh / kW / yr	kWh / panel / yr	kWh / system / yr	Sun, kWh/m²/day
Los Angeles	1,676	654	11,766	6.08
Palmdale	1,835	716	12,882	6.69
Chula Vista	1,696	661	11,906	6.11
Huntington Beach	1,643	641	11,534	5.89
Riverside	1,696	661	11,906	6.21
Santa Clarita	1,724	672	12,102	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 390 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 ML-G9+ 390	390 W	≈21.4%	−0.373	45.06	10.71	brand 11×	1
JA Solar JAM54S31-390/MR	390 W	≈20.5%	−0.329	36.85	13.61	product 2023, 2024	152
REC Group REC390AA Pure	390 W	≈21.8%	−0.256	48.6	10.19	brand 9× (2016–2025)	66
LONGi LR5-54HABB-395M	395 W	≈20.8%	−0.342	36.81	13.65	brand 9× (2017–2026)	64

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
Parent companyHanwha
Websiteq-cells.com
PVEL Top Performer (manufacturer)11 Scorecards (2016–2026)
RETC PV Module Index2023, 2024, 2025, 2026
Current panel series in CEC list81

Other series by SoCal permits

Q.PEAK DUO BLK ML-G10+ · 221Q.PEAK DUO BLK ML-G10.C+ · 124Q.TRON BLK M-G2+ · 40Q.TRON BLK M-G2.H+ · 33Q.TRON BLK M-G2.C+ · 24Q.TRON M-G2+ · 20

Questions & answers

How efficient is the Qcells Q.PEAK DUO ML-G9+ 390?

Calculated from the panel area (1.82 m²): about 21.4% for the 390 W class. 390 W over 1.82 m² equals about 214 W per square meter.

How much energy does one panel produce in Los Angeles or Palmdale?

PVWatts v8 with typical-year weather gives about 654 kWh per year per 390 W panel in Los Angeles and about 716 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.373 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.3% 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 3–12 panels per string (Voc at 2 °C = 48.3 V, Vmp at 74 °C cell = 29.6 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 48.3 V vs max input 60 V; Vmp when hot 29.6 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; Qcells was named a Top Performer in 11 Scorecards (2016–2026). RETC named Qcells Overall Highest Achiever in 2023, 2026.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2016–2026.
RETC — PV Module Index reports 2023–2026.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Jan 2022). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).