--- title: "Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 - Solar Panel Comparison | ComparePV" description: "Compare Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 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/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-peak-duo-ml-g12s-3-bfg-675" updated: 2026-09-11 --- # Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 Identical on every published parameter All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-670) | [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 | Q-Cells | Q-Cells | | Power | 670 Wp | 675 Wp | | Efficiency | 21.60 % | 21.70 % | | Technology | | | ## Every compared parameter | Parameter | 670 | 675 | | --- | --- | --- | | Rated power | 670 Wp | 675 Wp | | Module efficiency | 21.60 % | 21.70 % | | Power density | 215.7 Wp/m² | 217.3 Wp/m² | | Open-circuit voltage | 45.72 V | 45.74 V | | Voltage at max power | 38.27 V | 38.43 V | | Short-circuit current | 18.42 A | 18.45 A | | Current at max power | 17.51 A | 17.56 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.2 kg | 38.2 kg | | Weight per kWp | 57.0 kg/kWp | 56.6 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.45 %/yr | 0.45 %/yr | | Cell technology | - | - | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, 670:** 22,064 kWh - **Cumulative output, 675:** 22,228 kWh - **Gap:** 164 kWh ## Output when hot | Condition | Cell temperature | 670 | 675 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 670 W | 675 W | 100.0% of rated power | | Cool, bright day | 40 °C | 636 W | 641 W | 94.9% of rated power | | Typical summer roof | 55 °C | 602 W | 606 W | 89.8% of rated power | | Hot roof | 70 °C | 567 W | 572 W | 84.7% of rated power | ## Against the whole database | Measure | 670 | 675 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,652 | #7,421 | 14,005 | 675 leads by 231 places | | Power density | #7,644 | #7,349 | 14,005 | 675 leads by 295 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #11,008 | #10,738 | 14,005 | 675 leads by 270 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,462 | #2,198 | 14,005 | 675 leads by 264 places | ## Questions ### Which panel is better: Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 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 **21.60%**). 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 670 and Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675? **Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670** has a module efficiency of **21.60%**, 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 Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 use vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675? **Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670** uses Monocrystalline 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 Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 and Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675? **Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670** 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 Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 and Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675 bifacial panels? Both **Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670** and **Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675** 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. ## Related comparisons - [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-peak-duo-ml-g12s-3-bfg-665) - One difference: module efficiency - [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-peak-duo-ml-g12s-3-bfg-660) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 655](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-peak-duo-ml-g12s-3-bfg-655) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 650](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-peak-duo-ml-g12s-3-bfg-650) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.TRON XL-G2.3 / BFG 645](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-tron-xl-g2-3-bfg-645) - 14 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 vs Q-Cells Q.TRON XL-G2.3 / BFG 640](https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/q-cells-q-tron-xl-g2-3-bfg-640) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/q-cells-q-peak-duo-ml-g12s-3-bfg-670/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.