Q CELLS Q.TRON BLK M-G11+ 420W vs Silfab SIL-410-BG 410W
The Q CELLS Q.TRON BLK M-G11+ 420W wins this comparison by a clear margin. It leads in efficiency (21.6% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Q CELLS Q.TRON BLK M-G11+ 420W is the stronger choice.
Key Differences
- • Q CELLS Q.TRON BLK M-G11+ 420W is rated at 420W while Silfab SIL-410-BG 410W is rated at 410W, a 10W difference.
- • Q CELLS Q.TRON BLK M-G11+ 420W achieves 21.6% efficiency vs 21.2% for the other, a 0.4 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Q CELLS Q.TRON BLK M-G11+ 420W has a superior temperature coefficient of -0.29%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Q CELLS Q.TRON BLK M-G11+ 420W uses TOPCon N-type cells while Silfab SIL-410-BG 410W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Q CELLS Q.TRON BLK M-G11+ 420W achieves 21.6% module efficiency compared to Silfab SIL-410-BG 410W's 21.2%, meaning Q CELLS Q.TRON BLK M-G11+ 420W converts 0.4 percentage points more sunlight into electricity per square meter. In practical terms, the Q CELLS Q.TRON BLK M-G11+ 420W produces 215.1 watts per square meter of panel area while the Silfab SIL-410-BG 410W produces 210.0 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 Q CELLS Q.TRON BLK M-G11+ 420W delivers 420W per panel versus 410W for the Silfab SIL-410-BG 410W, a 10W difference per module. To build an 8 kW residential system, you would need 20 Q CELLS Q.TRON BLK M-G11+ 420W panels or 20 Silfab SIL-410-BG 410W panels. Despite the per-panel wattage difference, both require the same number of panels for this system size due to rounding. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Q CELLS Q.TRON BLK M-G11+ 420W has a temperature coefficient of -0.29%/°C versus -0.34%/°C for the Silfab SIL-410-BG 410W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Q CELLS Q.TRON BLK M-G11+ 420W retains 94.2% 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 Q CELLS Q.TRON BLK M-G11+ 420W is backed by a 25-year product warranty and 25-year performance guarantee, while the Silfab SIL-410-BG 410W offers 25-year product and 30-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1% first year then 0.4%/year for Q CELLS Q.TRON BLK M-G11+ 420W; 1% first year then 0.4%/year for Silfab SIL-410-BG 410W), after 25 years the Q CELLS Q.TRON BLK M-G11+ 420W should retain approximately 89.4% of original output versus 89.4% for the Silfab SIL-410-BG 410W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Q CELLS Q.TRON BLK M-G11+ 420W measures 1722×1134×30mm and weighs 21 kg, while the Silfab SIL-410-BG 410W measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Q CELLS Q.TRON BLK M-G11+ 420W versus 1.95 m² for the Silfab SIL-410-BG 410W. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Q CELLS Q.TRON BLK M-G11+ 420W | Silfab SIL-410-BG 410W |
|---|---|---|
| Power | 420W | 410W |
| Efficiency | 21.6% | 21.2% |
| Power Density | 20.0 W/sq ft | 19.5 W/sq ft |
| Cell Type | TOPCon N-type | PERC Mono |
| Bifacial | No | No |
| Weight | 21 kg | 21 kg |
| Temp Coefficient | -0.29%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 3600 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | South Korea | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Q CELLS Q.TRON BLK M-G11+ 420WThe Q CELLS Q.TRON BLK M-G11+ 420W achieves 21.6% efficiency versus 21.2% — a 0.4 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.3 kW more total system capacity, or 2 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Q CELLS Q.TRON BLK M-G11+ 420WThe Q CELLS Q.TRON BLK M-G11+ 420W has a better temperature coefficient of -0.29%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: TieBoth panels offer identical 25-year product warranties and 0.4% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Q CELLS Q.TRON BLK M-G11+ 420WThe Q CELLS Q.TRON BLK M-G11+ 420W delivers 420W versus 410W per panel — 10W more. For an 8 kW system, you need 20 panels with the higher-wattage option versus 20 panels, saving 0 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Q CELLS Q.TRON BLK M-G11+ 420WThe Q CELLS Q.TRON BLK M-G11+ 420W uses TOPCon N-type: TOPCon (Tunnel Oxide Passivated Contact) adds a thin tunnel oxide layer to reduce recombination losses, achieving higher efficiency than PERC while being manufacturable on existing production lines. The Silfab SIL-410-BG 410W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. TOPCon N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
Q CELLS Q.TRON BLK M-G11+ 420W
The Q.TRON BLK is Q CELLS' flagship all-black N-type panel delivering 420W with a 25-year product warranty and sleek aesthetics.
Pros
- + 25-year product warranty
- + Sleek all-black design
- + N-type TOPCon technology
- + Excellent reliability rating
Cons
- - Moderate wattage
- - South Korean premium pricing
- - All-black runs slightly warmer
Silfab SIL-410-BG 410W
The SIL-410-BG is Silfab's all-black residential PERC panel offering 410W with US manufacturing and a 25-year warranty.
Pros
- + US manufactured
- + All-black aesthetics
- + 25-year warranty
- + ARRA compliant
Cons
- - Standard PERC efficiency
- - Higher cost per watt
- - Limited model range
Choose Q CELLS Q.TRON BLK M-G11+ 420W 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 prefer newer cell technology with a longer performance improvement runway
- ✓ Aesthetics-focused homeowners wanting a reliable, all-black panel with strong warranty.
Choose Silfab SIL-410-BG 410W If...
- ✓ Homeowners wanting US-made, all-black panels with Buy America compliance.
Our Recommendation
We recommend the Q CELLS Q.TRON BLK M-G11+ 420W for most buyers in this comparison. It wins 4 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Silfab SIL-410-BG 410W remains a good product, but the Q CELLS Q.TRON BLK M-G11+ 420W delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Q CELLS Q.TRON BLK M-G11+ 420W or Silfab SIL-410-BG 410W?
The Q CELLS Q.TRON BLK M-G11+ 420W wins this comparison by a clear margin. It leads in efficiency (21.6% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Q CELLS Q.TRON BLK M-G11+ 420W is the stronger choice.
Which panel is more efficient, Q CELLS Q.TRON BLK M-G11+ 420W or Silfab SIL-410-BG 410W?
The Q CELLS Q.TRON BLK M-G11+ 420W at 21.6% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.4 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, Q CELLS Q.TRON BLK M-G11+ 420W or Silfab SIL-410-BG 410W?
The Q CELLS Q.TRON BLK M-G11+ 420W comes with a 25-year product warranty and 25-year performance guarantee. The Silfab SIL-410-BG 410W offers 25-year product and 30-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Q CELLS Q.TRON BLK M-G11+ 420W has a temperature coefficient of -0.29%/°C and the Silfab SIL-410-BG 410W is -0.34%/°C. Q CELLS Q.TRON BLK M-G11+ 420W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Q CELLS Q.TRON BLK M-G11+ 420W vs Silfab SIL-410-BG 410W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Q CELLS Q.TRON BLK M-G11+ 420W panels (420W each) or 20 Silfab SIL-410-BG 410W panels (410W each). The Q CELLS Q.TRON BLK M-G11+ 420W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026