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Q.PEAK DUO ML-G12S.3 / BFG 675 vs FS-7550A-TR1 2 of 17 identical Swap Change panels

Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 vs First Solar FS-7550A-TR1

Q.PEAK DUO ML-G12S.3 / BFG 675
675 Wp 21.70 % Bifacial
Open panel page Datasheet PDF
VS
First Solar FS-7550A-TR1
First Solar
FS-7550A-TR1
550 Wp 19.70 % CdTe
Open panel page Datasheet PDF
The verdict

Q.PEAK DUO ML-G12S.3 / BFG 675 leads on the differences that matter

The largest is module efficiency: 2.00 pp more efficient. 2 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.

See all 15 differences
How alike are they
2 of 17 comparable
parameters are identical
identical differs not published
01

What actually differs

15 of 17 parameters
Parameter Q.PEAK DUO ML-G12S.3 / BFG 675 FS-7550A-TR1 Difference
Module efficiency 21.70 % 19.70 % 2.00 pp more efficient
Rated power 675 Wp 550 Wp 125 W more power
Power density 217.3 Wp/m² 196.7 Wp/m² 20.6 Wp/m² higher
Annual degradation 0.45 %/yr 0.30 %/yr 0.15 %/yr slower
Weight per kWp 56.6 kg/kWp 72.2 kg/kWp 15.6 kg/kWp lighter
Temperature coefficient -0.340 %/°C -0.320 %/°C 0.020 %/°C better in heat
Open-circuit voltage 45.74 V 228.80 V 183.06 V apart
Short-circuit current 18.45 A 3.08 A 15.37 A apart
Module area 3.106 m² 2.797 m² 0.310 m² apart
Weight 38.2 kg 39.7 kg 1.5 kg lighter
Voltage at max power 38.43 V 190.40 V 151.97 V apart
Current at max power 17.56 A 2.89 A 14.67 A apart
Bifacial Yes No Yes vs No
Dimensions 2384x1303x35 mm 2300x1216x49 mm 2384x1303x35 mm vs 2300x1216x49 mm
Cell type Monocrystalline Thin film Monocrystalline vs Thin film
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
Q.PEAK DUO ML-G12S.3 / BFG 675
22,228 kWh
FS-7550A-TR1
18,543 kWh
Lifetime gap
3,685 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario Q.PEAK DUO ML-G12S.3 / BFG 675 FS-7550A-TR1
Standard test conditions 25 °C 100.0% of rated power 675 W 550 W
Cool, bright day 40 °C 94.9% of rated power 641 W 524 W
Typical summer roof 55 °C 89.8% of rated power 606 W 497 W
Hot roof 70 °C 84.7% of rated power 572 W 471 W
03

Full specification

Parameter Q.PEAK DUO ML-G12S.3 / BFG 675 FS-7550A-TR1 Difference
Power and efficiency
Rated power 675 Wp 550 Wp +125 W for Q.PEAK DUO ML-G12S.3 / BFG 675
Module efficiency 21.70 % 19.70 % +2.00 pp for Q.PEAK DUO ML-G12S.3 / BFG 675
Power density 217.3 Wp/m² 196.7 Wp/m² +20.6 Wp/m² for Q.PEAK DUO ML-G12S.3 / BFG 675
Open-circuit voltage 45.74 V 228.80 V 183.06 V apart
Voltage at max power 38.43 V 190.40 V 151.97 V apart
Short-circuit current 18.45 A 3.08 A 15.37 A apart
Current at max power 17.56 A 2.89 A 14.67 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.320 %/°C +0.020 %/°C for FS-7550A-TR1
Mechanical
Dimensions 2384x1303x35 mm 2300x1216x49 mm 2384x1303x35 mm vs 2300x1216x49 mm
Module area 3.106 m² 2.797 m² 0.310 m² apart
Weight 38.2 kg 39.7 kg -1.5 kg for Q.PEAK DUO ML-G12S.3 / BFG 675
Weight per kWp 56.6 kg/kWp 72.2 kg/kWp -15.6 kg/kWp for Q.PEAK DUO ML-G12S.3 / BFG 675
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.30 %/yr -0.15 %/yr for FS-7550A-TR1
Technology
Cell technology - CdTe Not published by Q-Cells
Cell type Monocrystalline Thin film Monocrystalline vs Thin film
Cell count 132 - Not published by First Solar
Bifacial Yes No Yes vs No
04

Against the whole database

14,129 panels
Efficiency
#7,485 vs #12,596
Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 5,111 places
Power density
#7,413 vs #12,632
Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 5,219 places
Heat behaviour
#8,846 vs #8,376
FS-7550A-TR1 leads by 470 places
Weight
#10,824 vs #13,625
Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 2,801 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,226 vs #9,153
Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 6,927 places
05

More useful comparisons

Open the full database
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670
The same specification on paper
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660
3 differences, the largest is module efficiency
Same series, other bin
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 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 675 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 650
4 differences, the largest is module efficiency
Same series, other bin
First Solar
First Solar FS-7550A-TR1 vs First Solar FS-7545A-TR1
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 675 or First Solar FS-7550A-TR1?
According to our database: Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 has higher module efficiency (21.70% vs 19.70%); First Solar FS-7550A-TR1 tolerates heat better (temp coeff -0.320%/°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 675 and First Solar FS-7550A-TR1?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 has a module efficiency of 21.70%, while First Solar FS-7550A-TR1 is 19.70%. 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 675 use vs First Solar FS-7550A-TR1?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 uses Monocrystalline cells; First Solar FS-7550A-TR1 uses CdTe. 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 675 and First Solar FS-7550A-TR1?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 has a 30 years power warranty; First Solar FS-7550A-TR1 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 675 and First Solar FS-7550A-TR1 bifacial panels?
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 is bifacial (captures light from both faces); First Solar FS-7550A-TR1 is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Compare Q-Cells and First Solar as manufacturers Portfolio, efficiency, cell technologies and warranty terms

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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.