Canadian Solar CS6R 420W vs Silfab SIL-410-BG 410W
The Silfab SIL-410-BG 410W wins this comparison by a decisive margin. It leads in efficiency (21.2% vs 21%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Silfab SIL-410-BG 410W is the stronger choice.
Key Differences
- • Canadian Solar CS6R 420W is rated at 420W while Silfab SIL-410-BG 410W is rated at 410W, a 10W difference.
- • Silfab SIL-410-BG 410W achieves 21.2% efficiency vs 21% for the other, a 0.2 percentage point gap.
- • Silfab SIL-410-BG 410W comes with a 25-year product warranty vs 12 years for the other.
Specifications Breakdown
Module Efficiency
The Silfab SIL-410-BG 410W achieves 21.2% module efficiency compared to Canadian Solar CS6R 420W's 21%, meaning Silfab SIL-410-BG 410W converts 0.2 percentage points more sunlight into electricity per square meter. In practical terms, the Canadian Solar CS6R 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 Canadian Solar CS6R 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 Canadian Solar CS6R 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
Both panels share an identical temperature coefficient of -0.34%/°C, meaning they lose power at the same rate as cell temperature rises above the 25°C standard test baseline. At 65°C cell temperature, both retain 93.2% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Canadian Solar CS6R 420W is backed by a 12-year product warranty and 25-year performance guarantee, while the Silfab SIL-410-BG 410W offers 25-year product and 30-year performance coverage. The Silfab SIL-410-BG 410W provides 13 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1.5% first year then 0.5%/year for Canadian Solar CS6R 420W; 1% first year then 0.4%/year for Silfab SIL-410-BG 410W), after 25 years the Canadian Solar CS6R 420W should retain approximately 86.5% of original output versus 89.4% for the Silfab SIL-410-BG 410W. This 2.9 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Canadian Solar CS6R 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 Canadian Solar CS6R 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 | Canadian Solar CS6R 420W | Silfab SIL-410-BG 410W |
|---|---|---|
| Power | 420W | 410W |
| Efficiency | 21% | 21.2% |
| Power Density | 20.0 W/sq ft | 19.5 W/sq ft |
| Cell Type | PERC Mono | PERC Mono |
| Bifacial | No | No |
| Weight | 21 kg | 21 kg |
| Temp Coefficient | -0.34%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.5% | 0.4% |
| Country | China | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Silfab SIL-410-BG 410WThe Silfab SIL-410-BG 410W achieves 21.2% efficiency versus 21% — a 0.2 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: TieBoth panels share a temperature coefficient of -0.34%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: Silfab SIL-410-BG 410WSilfab SIL-410-BG 410W leads with a 25-year product warranty versus 12 years. Silfab SIL-410-BG 410W degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 86.5% vs 89.4% of original output for Canadian Solar CS6R 420W and Silfab SIL-410-BG 410W respectively.
4. Power Output
Winner: Canadian Solar CS6R 420WThe Canadian Solar CS6R 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: TieBoth panels use PERC Mono cell technology. No technology advantage for either product.
Canadian Solar CS6R 420W
The CS6R is Canadian Solar's residential PERC workhorse delivering 420W in a compact, roof-friendly form factor.
Pros
- + Compact residential size
- + Affordable pricing
- + Proven track record
- + Easy installation
Cons
- - Older PERC technology
- - Standard performance
- - Higher degradation
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 Canadian Solar CS6R 420W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Budget residential installations from a bankable Tier 1 brand.
Choose Silfab SIL-410-BG 410W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ You want maximum output retention over the system's 25-30 year lifespan
- ✓ Homeowners wanting US-made, all-black panels with Buy America compliance.
Our Recommendation
The Silfab SIL-410-BG 410W is the decisive winner in this solar panel comparison, outperforming the Canadian Solar CS6R 420W in 2 of 5 dimensions. Unless you have a specific requirement that the Canadian Solar CS6R 420W uniquely addresses, the Silfab SIL-410-BG 410W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Canadian Solar CS6R 420W or Silfab SIL-410-BG 410W?
The Silfab SIL-410-BG 410W wins this comparison by a decisive margin. It leads in efficiency (21.2% vs 21%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Silfab SIL-410-BG 410W is the stronger choice.
Which panel is more efficient, Canadian Solar CS6R 420W or Silfab SIL-410-BG 410W?
The Silfab SIL-410-BG 410W at 21.2% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.2 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, Canadian Solar CS6R 420W or Silfab SIL-410-BG 410W?
The Canadian Solar CS6R 420W comes with a 12-year product warranty and 25-year performance guarantee. The Silfab SIL-410-BG 410W offers 25-year product and 30-year performance warranties. Silfab SIL-410-BG 410W provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The Canadian Solar CS6R 420W has a temperature coefficient of -0.34%/°C and the Silfab SIL-410-BG 410W is -0.34%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Canadian Solar CS6R 420W vs Silfab SIL-410-BG 410W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Canadian Solar CS6R 420W panels (420W each) or 20 Silfab SIL-410-BG 410W panels (410W each). The Canadian Solar CS6R 420W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026