REC Alpha Pure-R 460W vs Q CELLS Q.PEAK DUO BLK ML-G10+ 400W
The REC Alpha Pure-R 460W wins this comparison by a decisive margin. It leads in efficiency (22.2% vs 20.9%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the REC Alpha Pure-R 460W is the stronger choice.
Key Differences
- • REC Alpha Pure-R 460W is rated at 460W while Q CELLS Q.PEAK DUO BLK ML-G10+ 400W is rated at 400W, a 60W difference.
- • REC Alpha Pure-R 460W achieves 22.2% efficiency vs 20.9% for the other, a 1.3 percentage point gap.
- • Both carry matching 25-year product warranties.
- • REC Alpha Pure-R 460W has a superior temperature coefficient of -0.26%/°C vs -0.34%/°C, retaining more power in hot climates.
- • REC Alpha Pure-R 460W uses HJT (Heterojunction) cells while Q CELLS Q.PEAK DUO BLK ML-G10+ 400W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The REC Alpha Pure-R 460W achieves 22.2% module efficiency compared to Q CELLS Q.PEAK DUO BLK ML-G10+ 400W's 20.9%, meaning REC Alpha Pure-R 460W converts 1.3 percentage points more sunlight into electricity per square meter. In practical terms, the REC Alpha Pure-R 460W produces 220.9 watts per square meter of panel area while the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W produces 204.8 W/m². For rooftop installations where space is limited, this efficiency gap determines how many kilowatts you can fit on your available roof area. Over a 25-year system life, even a small efficiency advantage compounds into meaningful additional energy production.
Power Output
The REC Alpha Pure-R 460W delivers 460W per panel versus 400W for the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W, a 60W difference per module. To build an 8 kW residential system, you would need 18 REC Alpha Pure-R 460W panels or 20 Q CELLS Q.PEAK DUO BLK ML-G10+ 400W panels. Choosing the higher-wattage option saves 2 panels, reducing total racking hardware, wiring, and installation labor costs. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The REC Alpha Pure-R 460W has a temperature coefficient of -0.26%/°C versus -0.34%/°C for the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the REC Alpha Pure-R 460W retains 94.8% of its rated power while the other retains 93.2%. This difference is particularly significant in hot climates such as the American Southwest, the Middle East, and Southeast Asia, where panels routinely operate 30-40°C above STC for several hours each day. Over the system lifetime, the cumulative energy advantage from a better temperature coefficient can amount to 2-4% of total production.
Warranty Coverage
The REC Alpha Pure-R 460W is backed by a 25-year product warranty and 25-year performance guarantee, while the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W offers 25-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (0.5% first year then 0.35%/year for REC Alpha Pure-R 460W; 1% first year then 0.4%/year for Q CELLS Q.PEAK DUO BLK ML-G10+ 400W), after 25 years the REC Alpha Pure-R 460W should retain approximately 91.1% of original output versus 89.4% for the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W. This 1.7 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The REC Alpha Pure-R 460W measures 1728×1205×30mm and weighs 23 kg, while the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W measures 1722×1134×30mm at 20.5 kg. 2.08 m² of panel area for the REC Alpha Pure-R 460W versus 1.95 m² for the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W. The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W is 2.5 kg lighter per panel, which reduces structural load requirements on the roof and makes handling easier during installation. For a 20-panel system, that is a total weight difference of 50 kg. The more compact Q CELLS Q.PEAK DUO BLK ML-G10+ 400W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | REC Alpha Pure-R 460W | Q CELLS Q.PEAK DUO BLK ML-G10+ 400W |
|---|---|---|
| Power | 460W | 400W |
| Efficiency | 22.2% | 20.9% |
| Power Density | 20.5 W/sq ft | 19.0 W/sq ft |
| Cell Type | HJT (Heterojunction) | PERC Mono |
| Bifacial | Yes | No |
| Weight | 23 kg | 20.5 kg |
| Temp Coefficient | -0.26%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 3600 Pa | 3600 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 0.5% | 1% |
| Annual Degradation | 0.35% | 0.4% |
| Country | Singapore | South Korea |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: REC Alpha Pure-R 460WThe REC Alpha Pure-R 460W achieves 22.2% efficiency versus 20.9% — a 1.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.8 kW more total system capacity, or 9 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: REC Alpha Pure-R 460WThe REC Alpha Pure-R 460W has a better temperature coefficient of -0.26%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: REC Alpha Pure-R 460WREC Alpha Pure-R 460W degrades more slowly at 0.35% per year versus 0.4%. After 25 years, expect 91.1% vs 89.4% of original output for REC Alpha Pure-R 460W and Q CELLS Q.PEAK DUO BLK ML-G10+ 400W respectively.
4. Power Output
Winner: REC Alpha Pure-R 460WThe REC Alpha Pure-R 460W delivers 460W versus 400W per panel — 60W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 20 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: REC Alpha Pure-R 460WThe REC Alpha Pure-R 460W uses HJT (Heterojunction): HJT (Heterojunction) combines crystalline silicon with amorphous silicon layers, delivering the best temperature coefficient and bifacial gains, but at higher manufacturing cost. The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. HJT (Heterojunction) represents a newer generation technology with a longer performance runway as manufacturing matures.
REC Alpha Pure-R 460W
REC's Alpha Pure-R 460W delivers HJT performance in a larger format, combining high output with HJT's superior temperature and degradation performance. Note: model naming may vary by region.
Pros
- + High 460W HJT output
- + 25-year product warranty
- + Excellent heat tolerance
- + Low degradation
Cons
- - Large form factor
- - Premium pricing
- - Regional availability varies
Q CELLS Q.PEAK DUO BLK ML-G10+ 400W
The Q.PEAK DUO BLK is a proven all-black PERC panel from Q CELLS, offering 400W with the same 25-year product warranty.
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
Choose REC Alpha Pure-R 460W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You want maximum output retention over the system's 25-30 year lifespan
- ✓ You prefer newer cell technology with a longer performance improvement runway
Choose Q CELLS Q.PEAK DUO BLK ML-G10+ 400W If...
- ✓ Homeowners wanting an attractive, proven panel with extended warranty coverage.
Our Recommendation
The REC Alpha Pure-R 460W is the decisive winner in this solar panel comparison, outperforming the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W in 5 of 5 dimensions. Unless you have a specific requirement that the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W uniquely addresses, the REC Alpha Pure-R 460W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, REC Alpha Pure-R 460W or Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
The REC Alpha Pure-R 460W wins this comparison by a decisive margin. It leads in efficiency (22.2% vs 20.9%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the REC Alpha Pure-R 460W is the stronger choice.
Which panel is more efficient, REC Alpha Pure-R 460W or Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
The REC Alpha Pure-R 460W at 22.2% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.3 percentage points translates to approximately 60W per panel under standard test conditions.
Which has a better warranty, REC Alpha Pure-R 460W or Q CELLS Q.PEAK DUO BLK ML-G10+ 400W?
The REC Alpha Pure-R 460W comes with a 25-year product warranty and 25-year performance guarantee. The Q CELLS Q.PEAK DUO BLK ML-G10+ 400W offers 25-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The REC Alpha Pure-R 460W has a temperature coefficient of -0.26%/°C and the Q CELLS Q.PEAK DUO BLK ML-G10+ 400W is -0.34%/°C. REC Alpha Pure-R 460W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many REC Alpha Pure-R 460W vs Q CELLS Q.PEAK DUO BLK ML-G10+ 400W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 REC Alpha Pure-R 460W panels (460W each) or 20 Q CELLS Q.PEAK DUO BLK ML-G10+ 400W panels (400W each). The REC Alpha Pure-R 460W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026