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

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

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

Full specification

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

Against the whole database

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

More useful comparisons

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6 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: First Solar FS-7550A-TR1 or Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675?
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 First Solar FS-7550A-TR1 and Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675?
First Solar FS-7550A-TR1 has a module efficiency of 19.70%, while Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 is 21.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does First Solar FS-7550A-TR1 use vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675?
First Solar FS-7550A-TR1 uses CdTe cells; Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 uses Monocrystalline. 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 First Solar FS-7550A-TR1 and Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675?
First Solar FS-7550A-TR1 has a 30 years power warranty; Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 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 First Solar FS-7550A-TR1 and Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 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 First Solar and Q-Cells 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.