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Illustration · 120 half-cut cells
Solar panelQcells

Qcells Q.PEAK DUO BLK-G6+/SC 340

120 half-cut cells. Power classes 330–350 W in the CEC list.

CEC listed · Jan 13, 2020UL 61730PVEL Top Performer 2021Seen in 1 SoCal permit
Power class
  • Power (STC)340 WCEC nameplate
  • Efficiency≈19.7%calculated from area
  • %/°C Pmax−0.343CEC listing test
  • PTC / STC93.6%PTC 318 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 5 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
Q.PEAK DUO BLK-G6+/SC 330330 W40.1510.4133.299.91≈19.1%308 WJan 13, 2020
Q.PEAK DUO BLK-G6+/SC 335335 W40.4110.4733.629.97≈19.4%313 WJan 13, 2020
Q.PEAK DUO BLK-G6+/SC 340340 W40.6610.5233.9410.02≈19.7%318 WJan 13, 2020
Q.PEAK DUO BLK-G6+/SC 345345 W40.9210.5834.2510.07≈19.9%323 WJan 13, 2020
Q.PEAK DUO BLK-G6+/SC 350350 W41.1710.6334.5610.13≈20.2%328 WApr 12, 2021
≈ efficiency = Pmax ÷ CEC-listed area 1.73 m².
CEC note: Formerly listed under Hanwha Q CELLS

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ−0.343 %/°C
Voc coefficient β−0.269 %/°C
Isc coefficient α+0.044 %/°C
Operating cell temperatureNOCT 44.4 °C
Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
330 W242 W31.09 V × 7.78 A61.6 W93%
335 W245.9 W31.4 V × 7.83 A62.6 W93%
340 W249.4 W31.7 V × 7.87 A63.5 W93%
345 W253 W31.99 V × 7.91 A64.4 W93%
350 W256.8 W32.28 V × 7.96 A65.4 W93%
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, 2022
PVEL Top Performer
this series
5
Tests passed as Top Performer
DH, LID+LETID, MSS, PID, TC
11
PVEL Scorecards
Qcells named Top Performer, 2016–2026
2023, 2026
RETC Overall Highest Achiever
Qcells, manufacturer level

PVEL Top Performer tests

YearProductTests
2021Q.PEAK DUO BLK-G6+/SCDHPIDTC
2022Q.PEAK DUO BLK-G6+ (closely related product name)LID+LETIDMSSPIDTC
2021Q.PEAK DUO BLK‐G6+ (closely related product name)PID
2021Q. PEAK DUO BLK‐G6+ (closely related product name)LID+LETID

Tested bill of materials

Details describe the tested sample, not every module of the series.

RETC PV Module Index — Qcells

YearRecognition
2023Overall Highest Achiever; High Achievement in Performance (Module efficiency, Pan file performance); High Achievement in Reliability (Damp heat test, Pid resistance, Thermal cycle test)
2024High Achievement in Performance
2025Performance High Achiever
2026Overall 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)
43.2 V
Voc when cold
per panel
27.5 V
Vmp when hot
per panel
13
Max panels / string
max DC 600 V
3
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

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet3–13
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–13
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet4–13
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window9–11

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V43.2 / 27.5 V⚠ Works; below MPPT at peak heat1.17
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V43.2 / 27.5 V✗ Not a match: module voltage below MPPT range0.89
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V43.2 / 27.5 V⚠ Works; below MPPT at peak heat0.44
Enphase IQ8M-72-2-US260–460 W60 V30–45 V43.2 / 27.5 V⚠ Works; below MPPT at peak heat1.05
Enphase IQ8A-72-2-US295–500 W60 V32–45 V43.2 / 27.5 V⚠ Works; below MPPT at peak heat0.97
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
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,67657011,9676.08
Palmdale1,83562413,1026.69
Chula Vista1,69657712,1096.11
Huntington Beach1,64355911,7315.89
Riverside1,69657712,1096.21
Santa Clarita1,72458612,3096.28
781Jan782Feb1,003Mar1,108Apr1,095May1,163Jun1,225Jul1,240Aug1,084Sep956Oct822Nov711DeckWh per month · Los Angeles
Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Other versions of this panel

CEC PV Module List (Oct 7, 2026)
Qcells Q.PEAK DUO-G6+/SC
Color version · 340–355 W · listed 2020

Compare with similar 340 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · JinkoSolar datasheets · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)SoCal permits (series)
Qcells Q.PEAK DUO BLK-G6+/SC 340340 W≈19.7%−0.34340.6610.52product 20211
LONGi LR4-60HPB-340M340 W≈18.8%−0.33740.110.84product 2021, 2022193
JinkoSolar JKM340M-60HBL340 W≈20.1%−0.4064110.82brand 12× (2014–2026)45
REC Group REC340AA340 W≈20.2%−0.27943.110.09brand 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

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 BLK-G6+/SC 340?

Calculated from the panel area (1.73 m²): about 19.7% for the 340 W class. 340 W over 1.73 m² equals about 197 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 = −0.343 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.8% 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 3–13 panels per string (Voc at 2 °C = 43.2 V, Vmp at 74 °C cell = 27.5 V). Final design must follow the inverter manual and NEC 690.7.

Has this panel been reliability-tested?

Q.PEAK DUO BLK-G6+/SC was a PVEL Top Performer in 2021 (DH, PID, TC).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
  3. JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
  4. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2016–2026.
  5. RETC — PV Module Index reports 2023–2026.
  6. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  7. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  8. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  9. Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Jul 2020). Equipment matched from permit descriptions by model number.
  10. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).