--- title: "First Solar FS-7550A-TR1 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 - Solar Panel Comparison | ComparePV" description: "Compare First Solar FS-7550A-TR1 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/first-solar-fs-7550a-tr1/q-cells-q-peak-duo-ml-g12s-3-bfg-675" image: "https://comparepv.com/og/compare/panels/first-solar-fs-7550a-tr1/q-cells-q-peak-duo-ml-g12s-3-bfg-675.png" updated: 2026-09-11 --- # First Solar FS-7550A-TR1 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 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. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [First Solar FS-7550A-TR1](https://comparepv.com/panel/first-solar-fs-7550a-tr1) | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-675) | | Manufacturer | First Solar | Q-Cells | | Power | 550 Wp | 675 Wp | | Efficiency | 19.70 % | 21.70 % | | Technology | CdTe | | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | FS-7550A-TR1 | Q.PEAK DUO ML-G12S.3 / BFG 675 | Difference | | --- | --- | --- | --- | | Module efficiency | 19.70 % | 21.70 % | +2.00 pp for Q.PEAK DUO ML-G12S.3 / BFG 675 | | Rated power | 550 Wp | 675 Wp | +125 W 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 | | Annual degradation | 0.30 %/yr | 0.45 %/yr | -0.15 %/yr for FS-7550A-TR1 | | Weight per kWp | 72.2 kg/kWp | 56.6 kg/kWp | -15.6 kg/kWp for Q.PEAK DUO ML-G12S.3 / BFG 675 | | Temperature coefficient | -0.320 %/°C | -0.340 %/°C | +0.020 %/°C for FS-7550A-TR1 | | 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 for Q.PEAK DUO ML-G12S.3 / BFG 675 | | 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 | ## Every compared parameter | Parameter | FS-7550A-TR1 | Q.PEAK DUO ML-G12S.3 / BFG 675 | | --- | --- | --- | | Rated power | 550 Wp | 675 Wp | | Module efficiency | 19.70 % | 21.70 % | | Power density | 196.7 Wp/m² | 217.3 Wp/m² | | Open-circuit voltage | 228.80 V | 45.74 V | | Voltage at max power | 190.40 V | 38.43 V | | Short-circuit current | 3.08 A | 18.45 A | | Current at max power | 2.89 A | 17.56 A | | Temperature coefficient | -0.320 %/°C | -0.340 %/°C | | Dimensions | 2300x1216x49 mm | 2384x1303x35 mm | | Module area | 2.797 m² | 3.106 m² | | Weight | 39.7 kg | 38.2 kg | | Weight per kWp | 72.2 kg/kWp | 56.6 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.30 %/yr | 0.45 %/yr | | Cell technology | CdTe | - | | Cell type | Thin film | Monocrystalline | | Cell count | - | 132 | | Bifacial | No | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, FS-7550A-TR1:** 18,543 kWh - **Cumulative output, Q.PEAK DUO ML-G12S.3 / BFG 675:** 22,228 kWh - **Gap:** 3,685 kWh ## Output when hot | Condition | Cell temperature | FS-7550A-TR1 | Q.PEAK DUO ML-G12S.3 / BFG 675 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 550 W | 675 W | 100.0% of rated power | | Cool, bright day | 40 °C | 524 W | 641 W | 94.9% of rated power | | Typical summer roof | 55 °C | 497 W | 606 W | 89.8% of rated power | | Hot roof | 70 °C | 471 W | 572 W | 84.7% of rated power | ## Against the whole database | Measure | FS-7550A-TR1 | Q.PEAK DUO ML-G12S.3 / BFG 675 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #12,596 | #7,485 | 14,129 | Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 5,111 places | | Power density | #12,632 | #7,413 | 14,129 | Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 5,219 places | | Heat behaviour | #8,376 | #8,846 | 14,129 | FS-7550A-TR1 leads by 470 places | | Weight | #13,625 | #10,824 | 14,129 | Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 2,801 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #9,153 | #2,226 | 14,129 | Q.PEAK DUO ML-G12S.3 / BFG 675 leads by 6,927 places | ## Questions ### 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. ## Related comparisons - [First Solar FS-7550A-TR1 vs First Solar FS-7545A-TR1](https://comparepv.com/compare/first-solar-fs-7550a-tr1/first-solar-fs-7545a-tr1) - One difference: module efficiency - [First Solar FS-7550A-TR1 vs First Solar FS-7540A-TR1](https://comparepv.com/compare/first-solar-fs-7550a-tr1/first-solar-fs-7540a-tr1) - 5 differences, the largest is module efficiency - [First Solar FS-7550A-TR1 vs First Solar FS-7535A-TR1](https://comparepv.com/compare/first-solar-fs-7550a-tr1/first-solar-fs-7535a-tr1) - 6 differences, the largest is module efficiency - [First Solar FS-7550A-TR1 vs First Solar FS-7530A-TR1](https://comparepv.com/compare/first-solar-fs-7550a-tr1/first-solar-fs-7530a-tr1) - 6 differences, the largest is module efficiency - [First Solar FS-7550A-TR1 vs First Solar FS-7525A-TR1](https://comparepv.com/compare/first-solar-fs-7550a-tr1/first-solar-fs-7525a-tr1) - 6 differences, the largest is module efficiency - [First Solar FS-7550A-TR1 vs First Solar FS-7520A-TR1](https://comparepv.com/compare/first-solar-fs-7550a-tr1/first-solar-fs-7520a-tr1) - 6 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/first-solar-fs-7550a-tr1/q-cells-q-peak-duo-ml-g12s-3-bfg-675 Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.