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PEAK DUO ML-G12S.3 / BFG 665 vs TRON XL-G2.3 / BFG 640 4 of 18 identical Swap Change panels

Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 vs Q-Cells Q.TRON XL-G2.3 / BFG 640

Q.PEAK DUO ML-G12S.3 / BFG 665
665 Wp 21.40 % Bifacial
Open panel page Datasheet PDF
VS
Q-Cells Q.TRON XL-G2.3 / BFG 640
Q.TRON XL-G2.3 / BFG 640
640 Wp 22.90 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

TRON XL-G2.3 / BFG 640 leads on the differences that matter

The largest is module efficiency: 1.50 pp more efficient. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 14 differences
How alike are they
4 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 18 parameters
Parameter PEAK DUO ML-G12S.3 / BFG 665 TRON XL-G2.3 / BFG 640 Difference
Module efficiency 21.40 % 22.90 % 1.50 pp more efficient
Temperature coefficient -0.340 %/°C -0.290 %/°C 0.050 %/°C better in heat
Power density 214.1 Wp/m² 229.2 Wp/m² 15.2 Wp/m² higher
Rated power 665 Wp 640 Wp 25 W more power
Annual degradation 0.45 %/yr 0.33 %/yr 0.12 %/yr slower
Weight 38.2 kg 35.4 kg 2.8 kg lighter
Open-circuit voltage 45.70 V 57.79 V 12.09 V apart
Short-circuit current 18.39 A 13.99 A 4.40 A apart
Module area 3.106 m² 2.792 m² 0.314 m² apart
Voltage at max power 38.11 V 48.28 V 10.17 V apart
Current at max power 17.45 A 13.26 A 4.19 A apart
Cell count 132 156 24 cells apart
Weight per kWp 57.4 kg/kWp 55.3 kg/kWp 2.1 kg/kWp lighter
Dimensions 2384x1303x35 mm 2462x1134x35 mm 2384x1303x35 mm vs 2462x1134x35 mm
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
PEAK DUO ML-G12S.3 / BFG 665
21,899 kWh
TRON XL-G2.3 / BFG 640
21,592 kWh
Lifetime gap
307 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario PEAK DUO ML-G12S.3 / BFG 665 TRON XL-G2.3 / BFG 640
Standard test conditions 25 °C 100.0% of rated power 665 W 640 W
Cool, bright day 40 °C 94.9% of rated power 631 W 612 W
Typical summer roof 55 °C 89.8% of rated power 597 W 584 W
Hot roof 70 °C 84.7% of rated power 563 W 556 W
03

Full specification

Parameter PEAK DUO ML-G12S.3 / BFG 665 TRON XL-G2.3 / BFG 640 Difference
Power and efficiency
Rated power 665 Wp 640 Wp +25 W for PEAK DUO ML-G12S.3 / BFG 665
Module efficiency 21.40 % 22.90 % +1.50 pp for TRON XL-G2.3 / BFG 640
Power density 214.1 Wp/m² 229.2 Wp/m² +15.2 Wp/m² for TRON XL-G2.3 / BFG 640
Open-circuit voltage 45.70 V 57.79 V 12.09 V apart
Voltage at max power 38.11 V 48.28 V 10.17 V apart
Short-circuit current 18.39 A 13.99 A 4.40 A apart
Current at max power 17.45 A 13.26 A 4.19 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.290 %/°C +0.050 %/°C for TRON XL-G2.3 / BFG 640
Mechanical
Dimensions 2384x1303x35 mm 2462x1134x35 mm 2384x1303x35 mm vs 2462x1134x35 mm
Module area 3.106 m² 2.792 m² 0.314 m² apart
Weight 38.2 kg 35.4 kg -2.8 kg for TRON XL-G2.3 / BFG 640
Weight per kWp 57.4 kg/kWp 55.3 kg/kWp -2.1 kg/kWp for TRON XL-G2.3 / BFG 640
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.33 %/yr -0.12 %/yr for TRON XL-G2.3 / BFG 640
Technology
Cell technology - N-type Not published by Q-Cells
Cell type Monocrystalline Monocrystalline Same
Cell count 132 156 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#8,323 vs #2,359
TRON XL-G2.3 / BFG 640 leads by 5,964 places
Power density
#8,250 vs #2,368
TRON XL-G2.3 / BFG 640 leads by 5,882 places
Heat behaviour
#8,778 vs #2,165
TRON XL-G2.3 / BFG 640 leads by 6,613 places
Weight
#11,217 vs #9,773
TRON XL-G2.3 / BFG 640 leads by 1,444 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,833 vs #2,116
TRON XL-G2.3 / BFG 640 leads by 717 places
05

More useful comparisons

Open the full database
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670
One difference: module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660
One difference: module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 655
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 650
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.TRON XL-G2.3 / BFG 640 vs Q-Cells Q.TRON XL-G2.3 / BFG 645
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 or Q-Cells Q.TRON XL-G2.3 / BFG 640?
According to our database: Q-Cells Q.TRON XL-G2.3 / BFG 640 has higher module efficiency (22.90% vs 21.40%); Q-Cells Q.TRON XL-G2.3 / BFG 640 tolerates heat better (temp coeff -0.290%/°C vs -0.340%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 and Q-Cells Q.TRON XL-G2.3 / BFG 640?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 has a module efficiency of 21.40%, while Q-Cells Q.TRON XL-G2.3 / BFG 640 is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 use vs Q-Cells Q.TRON XL-G2.3 / BFG 640?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 uses Monocrystalline cells; Q-Cells Q.TRON XL-G2.3 / BFG 640 uses N-type. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 and Q-Cells Q.TRON XL-G2.3 / BFG 640?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 has a 30 years power warranty; Q-Cells Q.TRON XL-G2.3 / BFG 640 has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 and Q-Cells Q.TRON XL-G2.3 / BFG 640 bifacial panels?
Both Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665 and Q-Cells Q.TRON XL-G2.3 / BFG 640 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.