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Q-Cells Brand review

Q.PEAK DUO BLK-G9 350

350 Wp Monocrystalline
ComparePV verdict

Light for its output, short guarantee

Rank 12,708 of 14,129
Compare panels Datasheet PDF
Power (Wp)
350
Weak · bottom 16%
Efficiency (%)
20.30
Typical · median 20.70%
Density (Wp/m²)
203.1
Typical · median 207.4
Temp (%/°C)
-0.350
Typical · median -0.340
Weight (kg)
17.5
Strong · 4.0 kg below median
Warranty (yrs)
25
Weak · bottom 23%

Q-Cells Q.PEAK DUO BLK-G9 photovoltaic panels are a breakthrough solution utilizing Q.ANTUM DUO Z technology, which effectively eliminates empty spaces between individual cells. Thanks to this seamless layout, these modules achieve a significantly higher power density, which is crucial on the limited roof surface of single-family buildings. The use of monocrystalline half-cut cells in combination with an innovative twelve-busbar system minimizes internal energy losses and significantly increases the module resistance to micro-cracks. This series has been designed for the most demanding prosumer installations, where All-Black aesthetics must go hand in hand with maximum current efficiency. The completely black surface makes the panels blend discreetly into the dark expanses of modern roofs, solving the problem of visually unattractive installations. Compared to traditional competitive modules, the G9 series stands out for its excellent performance in diffuse light conditions and a favorable temperature coefficient, which guarantees higher energy yields on hot days. This is an ideal choice for investors focusing on uncompromising quality and long-term stability of electrical parameters, confirmed by durability certificates that significantly exceed standard market norms.

Ranking

4,586 panels in the 250-450 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.30% 20.70% Typical 11,851
Power density 203.1 207.4 Typical 11,840
Temperature coefficient -0.350 -0.340 Typical 10,489
Weight per kWp 50.0 54.4 Strong · top 21% 3,329
Performance warranty 25 yrs 30 yrs Weak · bottom 23% 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 5 caution
Best for

Residential, shaded-installations and hot-climate.

Not ideal for

Owners who want a long output guarantee.

Strengths
50.0 kg per kWp

Top 21% of the 250-450 W band, against a median of 54.4.

Watch-outs
25 year performance warranty

Bottom 23% of the 250-450 W band, against a median of 30 yrs.

What owners get
Q.ANTUM DUO Z technology with half-cut cells

Eliminating gaps between cells and using a 12-busbar layout reduces resistive losses and increases resistance to microcracks, resulting in more stable long-term module performance.

Favorable -0.35%/°C temperature coefficient

The -0.35%/°C value outperforms typical older PERC modules (around -0.37 to -0.40%/°C), meaning less power loss at high panel temperatures and higher yields on hot days.

All-Black aesthetic for residential roofs

The fully black frame and backsheet allow discreet integration with dark roof surfaces, an important selling point in the residential segment where aesthetics matter alongside electrical performance.

Tier-1 manufacturer with 25+ years of experience

Hanwha Q Cells (South Korea, founded 1999) is a bankable Tier-1 manufacturer, reducing financial risk for investors and easing bank financing approval for installations.

Trade-offs
Series discontinued

The Q.PEAK DUO BLK-G9 series was manufactured from 2020 to 2022 and has since been discontinued, meaning limited availability of identical replacement modules and potential difficulties with like-for-like warranty service.

Efficiency below some competitors

The maximum 20.3% efficiency is lower than comparable models such as the JA Solar JAM60D10 (20.4%) or YS Solar SM-90 (21%), meaning slightly lower power output for the same roof area.

No bifacial variant

The module is monofacial only, while bifacial technology has become standard in newer premium series, enabling extra energy yield from ground reflection, especially in ground-mount or elevated installations.

Power warranty below latest TOPCon standards

The 25-year power warranty guaranteeing 86% output trails newer N-type TOPCon modules, which now offer up to 30-year warranties while retaining over 87.4% of nominal power.

Notes from the database
  • Module efficiency of 20.3% is 1.5pp below average for database panels (median: 21.8%)
  • 203.1 W/m² power density is 15.0 W/m² below database median (218.1 W/m²) - requires larger installation area
  • At -0.35%/°C, loses 0.05pp more power per degree than database median (-0.30%/°C)
  • 17.5 kg weight - 9.0 kg lighter than database median (26.5 kg), reducing installation effort
  • In the top 84% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 350 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.30 % Typical Segment median 20.70%
Vmpp · Impp 34.66 V · 10.10 A Operating point at max power
Voc · Isc 40.98 V · 10.53 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1673×1030×32 mm · 1.72 m² of roof
Weight 17.5 kg Strong Strong · 4.0 kg below median
Cells 120 Monocrystalline
Coefficient Pmax -0.350 %/°C Typical median -0.340 of its segment
Coefficient Voc · Isc -0.270 · 0.040 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Weak bottom 23% · median 30 yrs
End-of-warranty output 86.0 % Equals 292 W guaranteed
Degradation 2.00 → 0.50 % 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
-

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

Heat losses
-0.350 %/°C against a segment median of -0.340
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Q-Cells Q.PEAK DUO BLK-G9 350 350 W 20.30% -0.350 17.5 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg -50 W, cooler, +3.0 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg -50 W, cooler, +3.0 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +2.8 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +2.8 pp
GKA182M300W 300 W 23.00% - 16.2 kg -50 W, +2.7 pp, +5 yr warranty
GKA210M320W 320 W 23.00% - 16.2 kg -30 W, +2.7 pp, +5 yr warranty
GKA210M340W 340 W 23.00% - 16.2 kg Lighter, +2.7 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +2.7 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +30 W, +2.7 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +50 W, +2.7 pp, +5 yr warranty
Q.PEAK DUO BLK-G9 335 335 W 19.40% -0.350 17.5 kg -15 W, -0.9 pp
Q.PEAK DUO BLK-G9 340 340 W 19.70% -0.350 17.5 kg -10 W, -0.6 pp
Q.PEAK DUO BLK-G9 345 345 W 20.00% -0.350 17.5 kg -0.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +115 W, cooler, +3.5 pp
LX-460M/182R-96+ GG 460 W 23.55% -0.260 23.5 kg +110 W, cooler, +3.2 pp
LX-455M/182R-96+ GG 455 W 23.30% -0.260 23.5 kg +105 W, cooler, +3.0 pp

Found 4 panels of the same or similar size to this one, within ±10 mm. See them here Found 30 panels of the same or similar size to this one, within ±25 mm. See them here Found 463 panels of the same or similar size to this one, within ±50 mm. See them here Found 875 panels of the same or similar size to this one, within ±100 mm. See them here

About the Q.PEAK DUO BLK-G9 series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

Is the Q.PEAK DUO BLK-G9 series still available for purchase?
The Q.PEAK DUO BLK-G9 series has been discontinued by Q-Cells and is no longer available as a new product. Limited stock may occasionally appear through distributors or the secondary market. If you need a similar All-Black module with comparable technology, Q-Cells offers newer generations such as the G10+ or G11 series, which retain the Q.ANTUM platform at higher wattages per panel.
What warranty comes with the Q.PEAK DUO BLK-G9 panels?
Q-Cells backs the Q.PEAK DUO BLK-G9 series with a 12-year product warranty covering material and workmanship defects, plus a 25-year linear power warranty. After 25 years, the module is guaranteed to retain at least 86% of its rated output - a figure that exceeds the common industry benchmark of 80% over the same period.
What is Q.ANTUM DUO Z technology and why does it matter in the G9 series?
Q.ANTUM DUO Z is Q-Cells' proprietary cell layout that eliminates the dead space between monocrystalline half-cut cells, raising module efficiency to 20.3% for the 350 Wp variant. The 12-busbar design shortens the current path, reducing resistive losses and lowering the risk of micro-cracks during shipping and long-term operation - both factors that directly impact the module's energy yield over its 25-year lifetime.
How does the Q.PEAK DUO BLK-G9 350W perform on hot summer days?
The series carries a temperature coefficient of -0.35%/°C for Pmax, which is better than most budget PERC modules rated at -0.37 to -0.40%/°C. At a cell temperature of 70°C, the module loses roughly 17.5% of its STC output rather than over 20%, translating to measurably higher daily energy yields during heat waves compared to lower-tier alternatives.
Do the all-black Q.PEAK DUO BLK-G9 panels look good on light-colored or terracotta roof tiles?
The BLK-G9 series features a full All-Black aesthetic: black cells, black anodized frame, and black backsheet. On dark roofs - black tiles, anthracite standing-seam metal, or dark bitumen shingles - the panels blend in seamlessly. On light terracotta or red ceramic tiles the contrast is noticeable, which some homeowners see as a downside. It is worth reviewing renders with your installer or architect before committing.
Is the Q.PEAK DUO BLK-G9 350W suitable for a pitched roof with partial shading?
Yes. The half-cut cell technology splits each cell into two independent halves, dividing the module into two separate electrical strings. When a chimney, vent pipe, or dormer shades part of the panel, power losses are roughly halved compared to a full-cell module. At 1673×1030 mm and 17.5 kg, the module is straightforward to install on standard roof-hook systems and is rated for snow loads up to 6,000 Pa and wind loads up to 4,000 Pa.
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