Illustration · 156 half-cut cells

Solar panelQcells

Qcells Q.PEAK DUO XL-G11S.L3/BFG 585

Name: Qcells Q.PEAK DUO XL-G11S.L3/BFG 585
Brand: Qcells

156 half-cut cells, bifacial, glass (dual-glass module). Power classes 575–600 W in the CEC list.

CEC listed · Jul 1, 2026UL 61730Bifacial

Power class

Power (STC)585 WCEC nameplate
Efficiency≈21.5%calculated from area
%/°C Pmax−0.348CEC listing test
PTC / STC93.3%PTC 546 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
Q.PEAK DUO XL-G11S.L3/BFG 575	575 W	53.50	13.67	44.30	12.98	≈21.1%	536 W	Jul 1, 2026
Q.PEAK DUO XL-G11S.L3/BFG 580	580 W	53.60	13.69	44.50	13.03	≈21.3%	541 W	Jul 1, 2026
Q.PEAK DUO XL-G11S.L3/BFG 585	585 W	53.60	13.72	44.80	13.07	≈21.5%	546 W	Jul 1, 2026
Q.PEAK DUO XL-G11S.L3/BFG 590	590 W	53.60	13.74	45.00	13.12	≈21.7%	551 W	Jul 1, 2026
Q.PEAK DUO XL-G11S.L3/BFG 595	595 W	53.60	13.77	45.20	13.17	≈21.9%	555 W	Jul 1, 2026
Q.PEAK DUO XL-G11S.L3/BFG 600	600 W	53.70	13.80	45.30	13.25	≈22.1%	560 W	Jul 1, 2026

≈ efficiency = Pmax ÷ CEC-listed area 2.72 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.72 m² (29.3 ft²)CEC-listed area
Cells156 half-cut cells
Back coverGlass (dual-glass module)

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.348 %/°C
Voc coefficient β	−0.261 %/°C
Isc coefficient α	+0.034 %/°C
Operating cell temperature	NOCT 45.5 °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
575 W	426.4 W	41.8 V × 10.2 A	109.9 W	96%
580 W	431.1 W	42.1 V × 10.24 A	110.9 W	96%
585 W	434.4 W	42.3 V × 10.27 A	111.9 W	96%
590 W	438.2 W	42.5 V × 10.31 A	112.9 W	96%
595 W	441.9 W	42.7 V × 10.35 A	113.9 W	96%
600 W	445.5 W	42.8 V × 10.41 A	115.1 W	96%

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

56.8 V

Voc when cold

per panel

36.4 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	2–10
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–10
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	3–10
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	7–8

Microinverters (one per panel)

No microinverter in the reference set lists this power class in its recommended module power range.

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	980	11,766	6.08
Palmdale	1,835	1,073	12,882	6.69
Chula Vista	1,696	992	11,906	6.11
Huntington Beach	1,643	961	11,534	5.89
Riverside	1,696	992	11,906	6.21
Santa Clarita	1,724	1,009	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 585 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 XL-G11S.L3/BFG 585	585 W	≈21.5%	−0.348	53.6	13.72	brand 11×	—
VSUN (Vietnam Sunergy) VSUN585N-144MH	585 W	≈22.7%	−0.309	52.25	13.88	brand 6× (2021–2026)	1
Phono Solar PS585M8GFH-24/TNH	585 W	≈22.9%	−0.293	52.9	13.72	product 2024, 2025	1
ZNShine Solar ZXM7-UHLDD144-585/N	585 W	≈22.9%	−0.281	51.7	14.41	product 2024, 2025, 2026	1

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 XL-G11S.L3/BFG 585?

Calculated from the panel area (2.72 m²): about 21.5% for the 585 W class. 585 W over 2.72 m² equals about 215 W per square meter.

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

PVWatts v8 with typical-year weather gives about 980 kWh per year per 585 W panel in Los Angeles and about 1,073 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.348 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18% 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 2–10 panels per string (Voc at 2 °C = 56.8 V, Vmp at 74 °C cell = 36.4 V). Final design must follow the inverter manual and NEC 690.7.

Is it bifacial?

Yes. Rear gain depends on mounting height and ground reflectance.

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 — 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).