--- title: "Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 670W Solar Panel - Specs & Review | ComparePV" description: "Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 670W solar panel. Specs: 21.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-670" updated: 2026-09-11 --- # Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670 Middle of its segment, heavy for its output 4,804 panels in the 570-770 W band, all technologies ## Identity - **Manufacturer:** Q-Cells - **Model:** Q.PEAK DUO ML-G12S.3 / BFG 670 - **Series:** Q.PEAK DUO ML-G12S SERIES - **Rated power:** 670 W - **Cell technology:** Monocrystalline - **Bifacial:** yes ## How it compares Compared against 570-770 W band, all technologies (4804 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 670 W | 625 W | Strong - top 21% | | | Module efficiency | 21.60% | 22.60% | Weak - bottom 19% | 7,652 | | Power density | 215.7 | 225.8 | Weak - bottom 18% | 7,644 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 13% | 8,778 | | Weight (kg) | 38.2 kg | 33.1 kg | Weak - bottom 11% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.60% | 22.60% | Weak - bottom 19% | 7,652 | | Power density | 215.7 | 225.8 | Weak - bottom 18% | 7,644 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 13% | 8,778 | | Weight per kWp | 57.0 | 53.1 | Weak - bottom 11% | 11,008 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **57.0 kg per kWp** - Bottom 11% of the 570-770 W band, against a median of 53.1. - **-0.340 %/°C temperature coefficient** - Bottom 13% of the 570-770 W band, against a median of -0.290. - **215.7 watts per square metre** - Bottom 18% of the 570-770 W band, against a median of 225.8. - **Best for:** Utility-scale, commercial and shaded-installations. - **Not ideal for:** Weight-limited structures, hot climates and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 670 W - **Efficiency:** 21.60 % - **Voltage at Pmax (Vmp):** 38.27 V - **Current at Pmax (Imp):** 17.51 A - **Open-circuit voltage (Voc):** 45.72 V - **Short-circuit current (Isc):** 18.42 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 20.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 38.2 kg - **Area:** 3.11 m2 - **Power density:** 215.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 569 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7652 of 14005 | | Power density | 7644 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 11008 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Half-cut cells + bifacial technology** - The combination of half-cut Q.ANTUM DUO cells with a bifacial design reduces power losses from shading and microcracks while capturing rear-side reflected irradiance, boosting real-world energy yield without increasing installed area. - **PID resistance** - Certified resistance to potential induced degradation protects the investment against power loss under the high system voltages typical of large 1500V ground-mount installations. - **Strong 30-year linear power warranty** - The manufacturer guarantees at least 93.95% of nominal power retained after 10 years and roughly 84.95% after 30 years, a result comparable to segment leaders such as Trina's Vertex TSM-DE21. - **Tier-1, bankable manufacturer since 1999** - Qcells (Hanwha Q Cells), headquartered in South Korea and operating since 1999, has consistently held BNEF Tier-1 status, easing project financing for banks and institutional investors. - **Reinforced frame for high loads** - The high-grade aluminum frame is certified for snow loads up to 5400 Pa and wind loads up to 2600 Pa, making the series suitable for harsh climates on large-scale PV farms. ## Cons - **P-type technology from 2022, not N-type** - The series is built on P-type PERC cells (Q.ANTUM DUO) launched in 2022, while newer N-type TOPCon modules from competitors (e.g., Trina Vertex N, JinkoSolar Tiger Neo) now reach efficiencies around 22-22.5% with lower LID degradation, potentially making this series less competitive in new 2026 tenders. - **12-year product warranty, shorter than 25-year offers** - The product warranty is 12 years, while some Tier-1 manufacturers (including some of Qcells' own residential lines) now offer a 25-year product warranty alongside a similar 30-year power warranty, which may affect risk assessment for projects with investment horizons beyond 12 years. ## About this series The Q.PEAK DUO ML-G12S series is built for large-scale ground-mount installations as well as commercial and industrial projects, where maximizing output per square meter of array space is essential. The panels use **half-cut cells** based on Q.ANTUM DUO technology, which reduces power losses from shading and microcracks while improving heat dissipation during operation. The applied **bifacial technology** captures light reflected from the ground surface, boosting real-world energy yield without increasing the footprint of the installation, which directly lowers the levelized cost of energy (LCOE). The series stands out for its **resistance to PID** (potential induced degradation), protecting the investment from long-term power loss, while a robust, high-grade aluminum frame ensures durability under heavy snow and wind loads. Thanks to **stable performance in demanding weather conditions** - low irradiance and high temperatures - the modules maintain high efficiency year-round. This is a solution for investors and installers of solar farms and commercial systems seeking proven technology that combines high unit power, long-term warranty coverage, and predictable return on investment, without compromising on build quality. ## Notable figures - At 21.6% efficiency, this panel is on par with typical \*\*database\*\* modules - At 215.7 W/m² power density, roof space requirements are typical for \*\*database\*\* panels - At -0.34%/°C, loses 0.04pp more power per degree than \*\*database\*\* median (-0.30%/°C) - At 38.2 kg, this panel is 11.7 kg heavier than the \*\*database\*\* median (26.5 kg) - more demanding for installation crews - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces ## Questions ### What is the maximum power output of Q-Cells Q.PEAK DUO ML-G12S panels and what installations are they suited for? The Q.PEAK DUO ML-G12S series delivers up to 675 Wp per module, making it one of the higher-power options available for large ground-mount installations and commercial or industrial projects. Higher unit power means fewer panels are needed to reach a given system size, reducing costs for racking, wiring, and labor on utility-scale PV farms. ### How does the bifacial technology in Q.PEAK DUO ML-G12S differ from standard monofacial panels? Bifacial modules in the Q.PEAK DUO ML-G12S series capture light on both the front and rear side of the cell, harvesting sunlight reflected off the ground surface, such as light-colored gravel or snow. With proper ground-mount installation, this can boost energy yield by several percent to over ten percent compared to a monofacial module of the same nominal power, without increasing the installation footprint. ### What warranty does Q-Cells offer on the Q.PEAK DUO ML-G12S series? Q-Cells provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the modules are still expected to deliver a substantial share of their original output at the end of that period, giving investors a predictable, long-term return on their PV farm investment. ### What is half-cut cell technology and why does Q-Cells use it in the ML-G12S series? Half-cut cells are standard silicon cells laser-cut in half, which lowers resistive current losses and improves heat dissipation during operation. Combined with Q.ANTUM DUO technology, this reduces power loss from partial shading and increases resistance to microcracks, which matters significantly for large ground-mount and commercial installations expected to run for decades. ### Are Q.PEAK DUO ML-G12S panels resistant to PID degradation and harsh weather conditions? Yes, the series carries certified PID (potential induced degradation) resistance, protecting the investment from sudden power loss caused by leakage currents in high-voltage systems. The modules also maintain stable output under low irradiance and high temperatures, while a robust aluminum frame withstands heavy snow and wind loads, important for utility-scale farms operating year-round. ### Is Q-Cells a Tier 1 manufacturer, and where are Q.PEAK DUO ML-G12S panels made? Yes, Q-Cells is classified as a Tier 1 manufacturer, meeting the strict bankability criteria used by financial institutions funding PV projects, which makes financing large installations easier. The company originates from South Korea and is part of the Hanwha Q CELLS group, one of the largest global solar manufacturers, ensuring supply stability and long-term warranty support. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/059ace11d38f360ac57be344.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.4 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.4 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +3.4 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +3.3 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.2 pp | | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 650](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-650) | 650 W | -20 W, -0.7 pp | | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 655](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-655) | 655 W | -15 W, -0.5 pp | | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-660) | 660 W | -10 W, -0.4 pp | | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-665) | 665 W | -0.2 pp | | [Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675](https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-675) | 675 W | Very close match | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +135 W, cooler, +3.5 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +130 W, cooler, +3.3 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +125 W, cooler, +3.2 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +120 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/q-cells-q-peak-duo-ml-g12s-3-bfg-670 Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.