Illustration · 156 half-cut cells

Solar panelQcells

Qcells Q.TRON XL-G2.3/BFG 625

Name: Qcells Q.TRON XL-G2.3/BFG 625
Brand: Qcells

156 half-cut cells, bifacial, glass (dual-glass module). Power classes 610–645 W in the CEC list.

CEC listed · Mar 1, 2024UL 61730BifacialPVEL Top Performer 2025, 2026

Power class

Power (STC)625 WCEC nameplate
Efficiency≈23.1%calculated from area
%/°C Pmax−0.288CEC listing test
PTC / STC94.1%PTC 588 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 8 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
Q.TRON XL-G2.3/BFG 610	610 W	56.11	13.65	47.10	12.95	≈22.5%	574 W	Mar 1, 2024
Q.TRON XL-G2.3/BFG 615	615 W	56.39	13.71	47.30	13.00	≈22.7%	579 W	Mar 1, 2024
Q.TRON XL-G2.3/BFG 620	620 W	56.67	13.76	47.50	13.05	≈22.9%	583 W	Mar 1, 2024
Q.TRON XL-G2.3/BFG 625	625 W	56.95	13.82	47.70	13.10	≈23.1%	588 W	Mar 1, 2024
Q.TRON XL-G2.3/BFG 630	630 W	57.23	13.88	47.89	13.15	≈23.2%	593 W	Mar 1, 2024
Q.TRON XL-G2.3/BFG 635	635 W	57.51	13.93	48.09	13.21	≈23.4%	598 W	Mar 1, 2024
Q.TRON XL-G2.3/BFG 640	640 W	57.59	13.99	48.28	13.26	≈23.6%	603 W	Dec 2, 2024
Q.TRON XL-G2.3/BFG 645	645 W	58.07	14.05	48.47	13.31	≈23.8%	608 W	Sep 2, 2025

≈ efficiency = Pmax ÷ CEC-listed area 2.71 m².

CEC note: Formerly listed under Hanwha Q CELLS

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.71 m² (29.2 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	−0.288 %/°C
Voc coefficient β	−0.232 %/°C
Isc coefficient α	+0.042 %/°C
Operating cell temperature	NOCT 47.3 °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
610 W	454.5 W	44.76 V × 10.15 A	115.1 W	94%
615 W	458.2 W	44.95 V × 10.19 A	116 W	94%
620 W	461.9 W	45.14 V × 10.23 A	116.9 W	94%
625 W	465.6 W	45.33 V × 10.27 A	117.9 W	94%
630 W	469.3 W	45.51 V × 10.31 A	118.8 W	94%
635 W	473.4 W	45.7 V × 10.36 A	119.8 W	94%
640 W	477 W	45.89 V × 10.4 A	120.8 W	94%
645 W	477 W	45.89 V × 10.4 A	120.8 W	94%

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

Certifications

CEC PV Module List (Oct 7, 2026)

UL 61730IEC 61215

UL 61730CEC listing
IEC 61215design qualification on file with CEC · Jan 8, 2024

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2025, 2026

PVEL Top Performer

this series

Tests passed as Top Performer

DH, HSS, LID+LETID, MSS, PAN, PID, TC, UVID

PVEL Scorecards

Qcells named Top Performer, 2016–2026

2023, 2026

RETC Overall Highest Achiever

Qcells, manufacturer level

PVEL Top Performer tests

Year	Product	Tests
2026	Q.TRON XL-G2.3/BFG	HSSLID+LETIDMSSPANUVID
2025	Q.TRON XL G2.3/BFG	DHHSSLID+LETIDMSSPIDTC

Tested bill of materials

PVEL-tested factoryGermany, USA
Cell technology (tested BOM)n-type TOPCon
Module design (tested BOM)bifacial - 2.0 glass//2.0 glass
Power class range tested630-675W
Hail test ice ball40 mm

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

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

60 V

Voc when cold

per panel

40 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	6–8

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	1,048	11,522	6.08
Palmdale	1,835	1,147	12,616	6.69
Chula Vista	1,696	1,060	11,660	6.11
Huntington Beach	1,643	1,027	11,296	5.89
Riverside	1,696	1,060	11,660	6.21
Santa Clarita	1,724	1,078	11,852	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 625 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)
Qcells Q.TRON XL-G2.3/BFG 625	625 W	≈23.1%	−0.288	56.95	13.82	product 2025, 2026
Canadian Solar CS7N-630MB-AG	630 W	≈20.5%	−0.390	44.2	18.23	product 2024
Hyundai Energy Solutions HiS-T625NJ	625 W	≈22.6%	−0.294	57.15	13.82	brand 5× (2017–2025)
JinkoSolar JKM625N-66HL4M-BDV	625 W	≈23.1%	−0.299	49.28	16.14	product 2025

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.TRON XL-G2.3/BFG 625?

Calculated from the panel area (2.71 m²): about 23.1% for the 625 W class. 625 W over 2.71 m² equals about 231 W per square meter.

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

PVWatts v8 with typical-year weather gives about 1,048 kWh per year per 625 W panel in Los Angeles and about 1,147 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.288 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 14.9% 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 = 60 V, Vmp at 74 °C cell = 40 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?

Q.TRON XL-G2.3/BFG was a PVEL Top Performer in 2026 (HSS, LID+LETID, MSS, PAN, UVID).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Hyundai Energy Solutions — datasheet [US] NJ(HiS) Series (N TOPCon Bifacial) 635~645W.
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR PRODUCT.
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 module and inverter libraries (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).