Q CELLS Q.PEAK DUO BLK ML-G10+ 400W Specifications & Review
The Q.PEAK DUO BLK is a proven all-black PERC panel from Q CELLS, offering 400W with the same 25-year product warranty.
What Makes the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W Different
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W comes from Q CELLS (Hanwha Qcells), one of the largest solar manufacturers with a strong presence in the US market where they operate a panel manufacturing facility in Dalton, Georgia. The Q.PEAK DUO series uses proven PERC cell technology with Q CELLS' proprietary Q.ANTUM technology for optimized cell performance. At 400W and 20.9% efficiency with 108 cells, the Q.PEAK DUO BLK ML-G10+ 400W delivers reliable PERC performance. Q CELLS' US manufacturing means some models qualify for domestic content ITC bonus credits under the Inflation Reduction Act. The 25-year product and 25-year performance warranty provide solid coverage, and Q CELLS' extensive US installer network ensures readily available service and support.
Key Specifications
| Brand | Q CELLS |
| Model | Q CELLS Q.PEAK DUO BLK ML-G10+ 400W |
| Power Output | 400W |
| Efficiency | 20.9% |
| Power Density | 19.0 W/sq ft |
| Cell Type | PERC Mono |
| Cell Count | 108 cells |
| Dimensions | 1722 x 1134 x 30 mm |
| Weight | 20.5 kg |
| Open Circuit Voltage (Voc) | 39.5V |
| Max Power Voltage (Vmp) | 33V |
| Short Circuit Current (Isc) | 13.09A |
| Max Power Current (Imp) | 12.12A |
| Temp Coefficient (Pmax) | -0.34%/°C |
| Product Warranty | 25 years |
| Performance Warranty | 25 years |
| First Year Degradation | 1% |
| Annual Degradation | 0.4% |
| Country of Manufacture | South Korea |
| Certifications | IEC 61215, IEC 61730, UL 1703 |
| Snow Load | 5400 Pa (112.8 psf) — Heavy Snow Rated |
| Wind Load | 3600 Pa (75.2 psf) |
Pros & Cons
Pros
- ✓ 25-year product warranty
- ✓ All-black aesthetics
- ✓ Proven PERC reliability
- ✓ Widely available in US
Cons
- ✗ Lower efficiency than N-type
- ✗ Older technology
- ✗ Standard PERC degradation
Best For
Homeowners wanting an attractive, proven panel with extended warranty coverage.
Is the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W Worth It?
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W delivers 400W of power at 20.9% module efficiency, which is near the current industry average of approximately 21%. While not the highest-efficiency option on the market, it may offer compelling value depending on price and your available roof space.
From a warranty perspective, the Q.PEAK DUO BLK ML-G10+ 400W comes with a industry-leading 25-year product warranty and a 25-year performance guarantee. The industry standard for product warranties ranges from 12 to 25 years, so this panel sits at the top of that range, giving you long-term peace of mind. At the end of 25 years, the panel is guaranteed to still produce approximately 89.4% of its rated output, with first-year degradation of 1% and just 0.4% per year after that.
Pricing varies by region and installer, but the Q.PEAK DUO BLK ML-G10+ 400W's combination of 20.9% efficiency and 25-year warranty should be weighed against per-watt quotes from your installer. Request at least three quotes to ensure you are getting competitive pricing for this tier of panel.
For hot climates, the temperature coefficient of -0.34%/°C is good. This falls within the typical range, so you can expect reasonable performance in most climates, though premium panels with coefficients closer to -0.25%/°C will edge ahead in extreme heat. Overall, the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W can be a reasonable choice depending on your budget and performance requirements.
Real-World Performance
In real-world conditions, the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W delivers consistent energy production shaped by its -0.34%/°C temperature coefficient. On a hot summer day when panel surface temperatures reach 65°C (40°C above STC), the Q.PEAK DUO BLK ML-G10+ 400W loses approximately 13.6% of rated output — typical for PERC technology. Over a full year in a typical US location, expect annual specific yield of 1,400-1,700 kWh per kW installed, depending on location, tilt, and shading. The 1% first-year degradation settles into 0.4% annual degradation thereafter; after 25 years the Q.PEAK DUO BLK ML-G10+ 400W should still produce approximately 89.4% of its original rating. The 108 half-cut cells provide improved shade tolerance compared to full-cell designs — when one cell is shaded, only one sub-string is affected rather than an entire string, limiting production losses to approximately one-third of the panel rather than one-half.
Who Should Buy the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
System Design Tips
For string inverter systems, the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W's Voc of 39.5V allows up to 15 panels per string on a 600V inverter, or 12 panels per string on 480V systems. The Isc of 13.09A is within the input range of all major residential string inverters and microinverters. For microinverter pairing, the Enphase IQ8A (366VA) or IQ8H (384VA) handles the 400W output well with a DC/AC ratio of 1.1-1.0. SolarEdge P505 optimizers pair well for optimizer-based systems. Size your inverter at 75-90% of total DC wattage for optimal clipping management — for a 25-panel array (10.0 kW DC), a 8 W AC inverter is a good match. The panel handles 5400 Pa snow load and 3600 Pa wind load.
Price Estimate
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W is sold through residential solar distributors and installers. Q CELLS pricing varies by distributor and order volume. For a 25-panel system (10.0 kW DC), total installed cost including panels, inverter, racking, wiring, permitting, and labor typically runs $2.50-3.50/W, or approximately $30,000-$35,000 before the 30% federal ITC. After ITC: approximately $21,000-$24,500.
How the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W Compares
| Model | Wattage | Efficiency | W/sq ft | Warranty | Snow Load | Cell Type |
|---|---|---|---|---|---|---|
| Q CELLS Q.PEAK DUO BLK ML-G10+ 400W (this panel) | 400W | 20.9% | 19.0 | 25 yrs | 5400 Pa | PERC Mono |
| JA Solar DeepBlue 3.0 400W | 400W | 20.9% | 19.0 | 12 yrs | 5400 Pa | PERC Mono |
| Panasonic EVPV400H | 400W | 21.2% | 19.0 | 25 yrs | 5400 Pa | HJT (Heterojunction) |
| Mission Solar MSE400 | 400W | 20.6% | 19.0 | 25 yrs | 5400 Pa | PERC Mono |
Compare This Panel
Installation & Compatibility
System Voltage & String Sizing
- Open Circuit Voltage (Voc)
- 39.5V
- Max Power Voltage (Vmp)
- 33V
- Short Circuit Current (Isc)
- 13.09A
- Max Power Current (Imp)
- 12.12A
- Max Panels per String (600V)
- 15 panels
Based on NEC 600V residential limit. Actual string sizing should account for cold-temperature Voc rise. Consult your installer or use a string sizing tool for your specific location.
Mounting Requirements
- Dimensions
- 1722 x 1134 x 30 mm
- Weight
- 20.5 kg (45.2 lbs)
- Area per Panel
- 21.0 sq ft
- Weight per sq ft
- 2.2 lbs/sq ft
Recommended Inverter Types
- - Microinverters: Ideal for shaded roofs or complex layouts. Match to panels rated 400W+.
- - String Inverters: Cost-effective for unshaded arrays. Ensure MPPT range covers 33V.
- - Hybrid Inverters: Best if adding battery storage. Check DC input specs match panel Voc of 39.5V.
Frequently Asked Questions
How efficient is the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W compared to other panels?
The Q.PEAK DUO BLK ML-G10+ 400W achieves 20.9% module efficiency, which is standard for PERC residential panels. PERC panels typically range from 20.0% to 21.8%, and the Q.PEAK DUO BLK ML-G10+ 400W delivers standard performance within that range. Higher efficiency means more watts per square foot of roof space.
What is the warranty on the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
Q CELLS provides a 25-year product warranty covering manufacturing defects and a 25-year performance warranty guaranteeing output levels. The performance warranty typically starts at 99% after year 1 and degrades by 0.4% per year, guaranteeing approximately 89.4% output at year 25. The extended product warranty coverage exceeds the industry standard of 10-12 years.
How many Q CELLS Q.PEAK DUO BLK ML-G10+ 400W panels do I need for my home?
For a typical US home using 10,000 kWh per year, you need approximately 25 panels (10.0 kW system) assuming 4-5 peak sun hours per day. This varies significantly by location — homes in Arizona may need 22-24 panels while homes in the Pacific Northwest may need 27-29 panels. Your installer will calculate the exact number based on your utility bills, roof orientation, shading, and local solar resource.
What is the efficiency of the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W achieves 20.9% module efficiency using PERC Mono cell technology. This is around the industry average for residential solar panels in 2026.
What warranty does the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W include?
It comes with a 25-year product warranty and a 25-year performance warranty guaranteeing output at approximately 89.4% of rated power at the end of the warranty period.
How does the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W perform in hot weather?
With a temperature coefficient of -0.34%/°C, the Q.PEAK DUO BLK ML-G10+ 400W experiences moderate power reduction in high temperatures. Every degree above 25°C reduces output by 0.34%.
What size system can I build with the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
At 400W per panel, you would need approximately 20 panels for an 8 kW system or 25 panels for a 10 kW system. Each panel measures 1722 x 1134 mm (21.0 sq ft).
What inverter is best with the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W works well with both string inverters and microinverters. For string inverters, choose one with a maximum input voltage above 39.5V and an MPPT voltage range that covers 33V. Microinverters rated for 400W+ panels are also an excellent choice, offering panel-level monitoring and shade tolerance. Popular options include Enphase IQ8 series microinverters and SolarEdge string inverters with power optimizers.
How long will the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W last?
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W is built to last well beyond its 25-year performance warranty. With first-year degradation of 1% and annual degradation of 0.4% thereafter, the panel will still produce approximately 89.4% of its rated power after 25 years. Most modern solar panels continue generating useful power for 30-40 years, though output gradually decreases over time.
Is the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W good for Arizona and other sunny states?
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W can work in hot states like Arizona, Nevada, and Texas, though its temperature coefficient of -0.34%/°C means it will lose some output on the hottest days. Consider panels with a lower (closer to 0) temperature coefficient if you live in an area with extreme heat. Higher sun exposure in these states means more total energy production throughout the year, often offsetting any heat-related losses.
Is the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W worth the money?
The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W delivers 20.9% efficiency, which is near the industry average of ~21%. Combined with a industry-leading 25-year product warranty and 25-year performance guarantee, it offers reasonable value for homeowners seeking reliable solar generation.
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Last updated: February 2026