40.6″ · 1,030 mm wide · 1.26″ (32 mm) frame · 43.9 lb (19.9 kg)

Solar panelQcells

Qcells Q.PEAK DUO-G6 340

Name: Qcells Q.PEAK DUO-G6 340
Brand: Qcells

120 half-cut cells (6 × 20). Power classes 330–360 W in the CEC list; datasheet covers 340–355 W.

CEC listed · Jun 17, 2019UL 6173012-yr product + 25-yr performance warrantyPVEL Top Performer 2022Installed in 8 SoCal permits

Power class

Power (STC)340 WCEC nameplate
Efficiency≥19.0%datasheet minimum
%/°C Pmax−0.36CEC test: −0.364
Degradation / yr0.54%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Qcells datasheet · 6 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
Q.PEAK DUO-G6 330	330 W	39.74	10.57	32.81	10.06	≈18.4%	306 W	Jun 17, 2019
Q.PEAK DUO-G6 340	340 W	40.24	10.68	33.45	10.16	≥19.0%	315 W	Jun 17, 2019
Q.PEAK DUO-G6 345	345 W	40.49	10.73	33.76	10.22	≥19.3%	321 W	Jun 17, 2019
Q.PEAK DUO-G6 350	350 W	40.73	10.79	34.07	10.27	≥19.5%	326 W	Aug 23, 2021
Q.PEAK DUO-G6 355	355 W	40.98	10.84	34.38	10.33	≥19.8%	330 W	Aug 23, 2021
Q.PEAK DUO-G6 360	360 W	41.23	10.90	34.69	10.38	≈20.1%	335 W	Aug 23, 2021

≈ efficiency = Pmax ÷ panel area 1.792 m² (datasheet size) for classes outside the datasheet.

CEC note: Formerly listed under Hanwha Q CELLS

Build & dimensions

Qcells datasheet · Cali-Graf calculation

Dimensions68.5 × 40.6 × 1.26 in1,740 × 1,030 × 32 mm
Module area1.79 m² (19.3 ft²)length × width
Weight43.9 lb (19.9 kg)
Cells120 half-cut cells (6 × 20)
Front glass3.2 mm thermally pre-stressed glass with
Back coverComposite film
FrameBlack anodised aluminium
Junction box53–101 mm × 32–60 mm × 15–18 mm
Cable / connector4 mm² Solar cable; (+) ≥ 1150 mm, (-) ≥ 1150 mm · Stäubli MC4, Hanwha Q CELLS HQC4, Amphenol UTX

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.36 %/°C	−0.364 %/°C
Voc coefficient β	−0.27 %/°C	−0.273 %/°C
Isc coefficient α	+0.04 %/°C	+0.042 %/°C
Vmp coefficient	≈ −0.40 %/°C	—
Operating cell temperature	NMOT 43 ± 3 °C	NOCT 45.7 °C

Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

At normal operating conditions (NMOT, 800 W/m²) — datasheet

Class	Pmax, W	Voc, V	Isc, A	Vmp, V	Imp, A
340 W	254.5	37.94	8.60	31.81	8.00
345 W	258.2	38.17	8.65	32.10	8.04
350 W	261.9	38.41	8.69	32.40	8.09
355 W	265.7	38.65	8.74	32.69	8.13

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
330 W	243.5 W	30.63 V × 7.95 A	63.7 W	97%
340 W	250.7 W	31.23 V × 8.03 A	65.6 W	97%
345 W	247 W	30.63 V × 8.06 A	63.6 W	92%
350 W	250.5 W	30.91 V × 8.1 A	64.5 W	92%
355 W	254.3 W	31.19 V × 8.15 A	65.5 W	92%
360 W	257.8 W	31.47 V × 8.19 A	66.4 W	92%

Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Electrical & strength ratings

Qcells datasheet

Max system voltage1,000 V (UL)
Max reverse current20 A
Fire rating (UL 61730)Type 2
Protection classClass II
Design load push / pull75 psf3,600 Pa

Packaging: 32 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · Qcells datasheet

UL 61730UL 1703IEC 61215IEC 61730Fire rating Type 2 (UL 61730)

UL 61730CEC listing
UL 1703datasheet
IEC 61215datasheet
IEC 61730datasheet
Fire rating Type 2 (UL 61730)datasheet

Warranty & degradation

Qcells datasheet

Straight line from 100% to the end-of-warranty value — linear, per datasheet.

Product warranty12 years
Performance warranty25 years, linear
Then≤ 0.54% / year
Year 25≥ 85%

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2022

PVEL Top Performer

this series

Tests passed as Top Performer

MSS

PVEL Scorecards

Qcells named Top Performer, 2016–2026

2023, 2026

RETC Overall Highest Achiever

Qcells, manufacturer level

PVEL Top Performer tests

Year	Product	Tests
2022	Q.PEAK DUO G6+	MSS

Tested bill of materials

Cell technology (tested BOM)p-type PERC
Module design (tested BOM)Monofacial - glass//backsheet
Power class range tested355-400W

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

Qcells datasheet · Cali-Graf calculation · NLR PVWatts v8 · CEC PV Module List (Oct 7, 2026) · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

42.7 V

Voc when cold

per panel

26.9 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.

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	3–14
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–14
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–14
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–11

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	42.7 / 26.9 V	⚠ Works; below MPPT at peak heat	1.17
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	42.7 / 26.9 V	✗ Not a match: module voltage below MPPT range	0.89
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	42.7 / 26.9 V	⚠ Works; below MPPT at peak heat	0.44
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	42.7 / 26.9 V	⚠ Works; below MPPT at peak heat	1.05
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	42.7 / 26.9 V	⚠ Works; below MPPT at peak heat	0.97

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	570	11,967	6.08
Palmdale	1,835	624	13,102	6.69
Chula Vista	1,696	577	12,109	6.11
Huntington Beach	1,643	559	11,731	5.89
Riverside	1,696	577	12,109	6.21
Santa Clarita	1,724	586	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.

Who installs Q.PEAK DUO-G6 panels in SoCal

building permits

Permits naming this series

Aug 2020 – Sep 2021

Jurisdictions so far

LA County (unincorp.) (8)

Permits over time

Power class named in permit

340 W

350 W

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

Inverters

SolarEdge SE…H (HD-Wave)

Optimizers

SolarEdge Power Optimizer

Number of permits naming both this panel series and the product; 6 of 8 permits list other equipment.

Compare with similar 340 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · JinkoSolar datasheets · building permits

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
Qcells Q.PEAK DUO-G6 340	340 W	≥19%	−0.364	40.24	10.68	product 2022	8
LONGi LR4-60HPB-340M	340 W	≈18.8%	−0.337	40.1	10.84	product 2021, 2022	193
JinkoSolar JKM340M-60HBL	340 W	≈20.1%	−0.406	41	10.82	brand 12× (2014–2026)	45
REC Group REC340AA	340 W	≈20.2%	−0.279	43.1	10.09	brand 9× (2016–2025)	30

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-G6 340?

The Qcells datasheet guarantees at least 19% module efficiency for the 340 W class (up to 19.8% for 355 W). 340 W over 1.79 m² equals about 190 W per square meter.

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

PVWatts v8 with typical-year weather gives about 570 kWh per year per 340 W panel in Los Angeles and about 624 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.36 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.6% 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 3–14 panels per string (Voc at 2 °C = 42.7 V, Vmp at 74 °C cell = 26.9 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

12 years on the product and 25 years linear on performance: at least 85% after 25 years (manufacturer datasheet).

How big and heavy is it?

68.5 × 40.6 × 1.26 in (1,740 × 1,030 × 32 mm), 43.9 lb (19.9 kg).

Has this panel been reliability-tested?

Q.PEAK DUO G6+ was a PVEL Top Performer in 2022 (MSS).

What fire rating does it have?

UL 61730 fire rating Type 2 per datasheet.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.PEAK DUO-G6 ENDURING HIGH PERFORMANCE”.
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
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) (Aug 2020 – Sep 2021). 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).

Qcells Q.PEAK DUO-G6 340

Power classes

Build & dimensions

Heat & cold behaviour

At normal operating conditions (NMOT, 800 W/m²) — datasheet

Away from lab conditions — CEC listing test points

Electrical & strength ratings

Certifications

Warranty & degradation

Independent reliability testing

PVEL Top Performer tests

Tested bill of materials

RETC PV Module Index — Qcells

Inverter compatibility & string sizing

String inverters most named in SoCal permits

Microinverters (one per panel)

Expected production in Southern California

Who installs Q.PEAK DUO-G6 panels in SoCal

Permits over time

Power class named in permit

Installed together with

Inverters

Optimizers

Other versions of this panel

Compare with similar 340 W panels

About Qcells

Other series by SoCal permits

Questions & answers

Sources