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Q-Cells Brand review

Q.PEAK DUO ML-G12S.3 / BFG 660

660 Wp Monocrystalline Bifacial 70%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 3,228 of 14,005
Compare panels Datasheet PDF
Power (Wp)
660
Strong · top 25%
Efficiency (%)
21.20
Weak · bottom 10%
Density (Wp/m²)
212.5
Weak · bottom 11%
Temp (%/°C)
-0.340
Weak · bottom 14%
Weight (kg)
38.2
Weak · 5.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

5,083 panels in the 560-760 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.20% 22.54% Weak · bottom 10% 9,076
Power density 212.5 225.4 Weak · bottom 11% 8,959
Temperature coefficient -0.340 -0.290 Weak · bottom 14% 8,778
Weight per kWp 57.9 53.1 Weak · bottom 8% 11,467
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 5 caution
Best for

Utility-scale, commercial and shaded-installations.

Not ideal for

Weight-limited structures, tight roof space and roofs where every square metre has to count.

Watch-outs
57.9 kg per kWp

Bottom 8% of the 560-760 W band, against a median of 53.1. Ranked 11,467th in the whole database.

21.20% module efficiency

Bottom 10% of the 560-760 W band, against a median of 22.54%. Ranked 9,076th in the whole database.

212.5 watts per square metre

Bottom 11% of the 560-760 W band, against a median of 225.4.

What owners get
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.

Trade-offs
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.

Notes from the database
  • Efficiency of 21.2% is 0.6pp below the database median (21.8%)
  • Power density of 212.5 W/m² is 5.6 W/m² below database median (218.1 W/m²) - needs more roof space
  • -0.34%/°C temperature coefficient - 0.04pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.20 % Weak Segment median 22.54%
Vmpp · Impp 37.94 V · 17.39 A Operating point at max power
Voc · Isc 45.68 V · 18.36 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 38.2 kg Weak Weak · 5.5 kg above median
Cells 132 Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.340 %/°C Weak bottom 14% of its segment
Coefficient Voc · Isc -0.270 · 0.040 %/°C
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 85.0 % Equals 561 W guaranteed
Degradation 2.00 → 0.45 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.340 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660 660 W 21.20% -0.340 38.2 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +4.0 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +4.0 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +40 W, cooler, +3.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +3.7 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.6 pp
Q.PEAK DUO ML-G12S.3 / BFG 650 650 W 20.90% -0.340 38.2 kg -10 W, -0.3 pp
Q.PEAK DUO ML-G12S.3 / BFG 655 655 W 21.10% -0.340 38.2 kg Very close match
Q.PEAK DUO ML-G12S.3 / BFG 665 665 W 21.40% -0.340 38.2 kg Very close match
Q.PEAK DUO ML-G12S.3 / BFG 670 670 W 21.60% -0.340 38.2 kg +10 W, +0.4 pp
Q.PEAK DUO ML-G12S.3 / BFG 675 675 W 21.70% -0.340 38.2 kg +15 W, +0.5 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +145 W, cooler, +3.9 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +140 W, cooler, +3.7 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +135 W, cooler, +3.6 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +130 W, cooler, +3.4 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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