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68.5″ · 1,740 mm
40.6″ · 1,030 mm wide · 1.26″ (32 mm) frame · 43.9 lb (19.9 kg)
Solar panelQcells

Qcells Q.PEAK DUO-G8+ 350

110 half-cut cells. Power classes 330–360 W in the CEC list; datasheet covers 345–360 W.

CEC listed · Aug 21, 2020UL 6173025-yr product + 25-yr performance warrantyPVEL Top Performer 2022Installed in 20 SoCal permits
Power class
  • Power (STC)350 WCEC nameplate
  • Efficiency≥19.5%datasheet minimum
  • %/°C Pmax−0.35CEC test: −0.343
  • Degradation / yr0.54%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Qcells datasheet · 7 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
Q.PEAK DUO-G8+ 330330 W39.7110.5232.9710.01≈18.4%308 WAug 21, 2020
Q.PEAK DUO-G8+ 335335 W39.9610.5733.2910.06≈18.7%313 WAug 21, 2020
Q.PEAK DUO-G8+ 340340 W40.2010.6333.6110.12≈19.0%318 WAug 21, 2020
Q.PEAK DUO-G8+ 345345 W40.4510.6833.9210.17≥19.3%323 WAug 21, 2020
Q.PEAK DUO-G8+ 350350 W40.7010.7434.2410.22≥19.5%328 WAug 21, 2020
Q.PEAK DUO-G8+ 355355 W40.9510.7934.5510.28≥19.8%332 WAug 21, 2020
Q.PEAK DUO-G8+ 360360 W41.1910.8434.8510.33≥20.1%337 WAug 21, 2020
≈ 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

Heat & cold behaviour

Qcells datasheet · CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
DatasheetCEC listing test
Pmax coefficient γ−0.35 %/°C−0.343 %/°C
Voc coefficient β−0.27 %/°C−0.270 %/°C
Isc coefficient α+0.04 %/°C+0.043 %/°C
Vmp coefficient≈ −0.39 %/°C—
Operating cell temperatureNMOT 43 ± 3 °CNOCT 44.4 °C
Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

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

ClassPmax, WVoc, VIsc, AVmp, VImp, A
345 W258.438.148.6132.288.00
350 W262.138.388.6532.578.05
355 W265.938.618.6932.878.09
360 W269.638.858.7433.168.13

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
330 W243.2 W30.68 V × 7.93 A63.1 W96%
335 W246.8 W30.98 V × 7.97 A64 W96%
340 W250.6 W31.27 V × 8.01 A65 W96%
345 W254.2 W31.56 V × 8.05 A65.9 W96%
350 W257.9 W31.86 V × 8.09 A66.9 W96%
355 W261.7 W32.15 V × 8.14 A67.9 W96%
360 W265.3 W32.43 V × 8.18 A68.8 W96%
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Electrical & strength ratings

Certifications

CEC PV Module List (Oct 7, 2026) · Qcells datasheet
UL 61730IEC 61215IEC 61730Fire rating Type 2 (UL 61730)

Warranty & degradation

Qcells datasheet · Cali-Graf calculation
80%85%90%95%100%051015202598% yr 193.14% yr 1085.04% yr 25years
  • Product warranty25 years
  • Performance warranty25 years, linear
  • Year 1≥ 98%
  • Then≤ 0.54% / year
  • Year 10≥ 93.14%calculated from warranty terms
  • Year 25≥ 85%

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index
2022
PVEL Top Performer
this series
4
Tests passed as Top Performer
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
2022Q.PEAK DUO G8+LID+LETIDMSSPIDTC

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

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)
43.2 V
Voc when cold
per panel
27.7 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.

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 / 27.7 V⚠ Works; below MPPT at peak heat1.21
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V43.2 / 27.7 V✗ Not a match: module voltage below MPPT range0.92
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V43.2 / 27.7 V⚠ Works; below MPPT at peak heat0.45
Enphase IQ8M-72-2-US260–460 W60 V30–45 V43.2 / 27.7 V⚠ Works; below MPPT at peak heat1.08
Enphase IQ8A-72-2-US295–500 W60 V32–45 V43.2 / 27.7 V⚠ Works; below MPPT at peak heat1
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 Angeles1,67658711,7326.08
Palmdale1,83564212,8456.69
Chula Vista1,69659411,8726.11
Huntington Beach1,64357511,5015.89
Riverside1,69659411,8726.21
Santa Clarita1,72460312,0686.28
766Jan766Feb984Mar1,086Apr1,073May1,140Jun1,201Jul1,215Aug1,063Sep937Oct806Nov697DeckWh 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.

Who installs Q.PEAK DUO-G8+ panels in SoCal

building permits
20
Permits naming this series
Aug 2021 – Mar 2022
1
Jurisdictions so far
LA County (unincorp.) (20)

Permits over time

2Aug ’214Sep1Oct7Nov3Dec1Jan ’221Feb1Marpermits per month

Top ZIP codes

  • ZIP 910014
  • ZIP 910064
  • ZIP 917223
  • ZIP 912142
  • ZIP 917752
  • Other ZIP codes5

Typical system

median 7.3 kW, 21 panels (n = 16)

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)
20
Number of permits naming both this panel series and the product; 20 of 20 permits list other equipment.

Other versions of this panel

CEC PV Module List (Oct 7, 2026) · building permits
Qcells Q.PEAK DUO BLK-G8
Color version · 330–360 W · listed 2021 · 1 SoCal permits
Qcells Q.PEAK DUO BLK-G8+
Color version · 330–360 W · listed 2021 · 5 SoCal permits
Qcells Q.PEAK DUO-G8
Same product line · 330–360 W · listed 2020 · 1 SoCal permits

Compare with similar 350 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-G8+ 350350 W≥19.5%−0.34340.710.74product 202220
LONGi LR4-60HPB-350M350 W≈19.8%−0.33940.411.16product 2021, 2022193
JinkoSolar JKM345M-60HBL345 W≈20.4%−0.40641.210.91brand 12× (2014–2026)45
REC Group REC350AA350 W≈20.8%−0.27943.810.16brand 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-G8+ 350?

The Qcells datasheet guarantees at least 19.5% module efficiency for the 350 W class (up to 20.1% for 360 W). 350 W over 1.79 m² equals about 195 W per square meter.

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

PVWatts v8 with typical-year weather gives about 587 kWh per year per 350 W panel in Los Angeles and about 642 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.35 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.1% 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 3–13 panels per string (Voc at 2 °C = 43.2 V, Vmp at 74 °C cell = 27.7 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

25 years on the product and 25 years linear on performance: at least 98% of rated power in year 1, then no more than 0.54% per year — 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 G8+ was a PVEL Top Performer in 2022 (LID+LETID, MSS, PID, TC).

What fire rating does it have?

UL 61730 fire rating Type 2 per datasheet.

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. Qcells — manufacturer datasheet “Q.PEAK DUO-G8+ 345-360 EN ENDURING HIGH”.
  3. JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
  4. JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
  5. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2016–2026.
  6. RETC — PV Module Index reports 2023–2026.
  7. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  8. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  9. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  10. Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Aug 2021 – Mar 2022). Equipment matched from permit descriptions by model number.
  11. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).