Canadian Solar CS6R 420W vs Aptos Solar DNA-144-BF26 440W
The Aptos Solar DNA-144-BF26 440W wins this comparison by a decisive margin. It delivers more power (440W vs 420W). For most residential installations, the Aptos Solar DNA-144-BF26 440W is the stronger choice.
Key Differences
- • Canadian Solar CS6R 420W is rated at 420W while Aptos Solar DNA-144-BF26 440W is rated at 440W, a 20W difference.
- • Canadian Solar CS6R 420W achieves 21% efficiency vs 20.21% for the other, a 0.8 percentage point gap.
- • Aptos Solar DNA-144-BF26 440W comes with a 25-year product warranty vs 12 years for the other.
- • Canadian Solar CS6R 420W has a superior temperature coefficient of -0.34%/°C vs -0.35%/°C, retaining more power in hot climates.
- • Canadian Solar CS6R 420W uses PERC Mono cells while Aptos Solar DNA-144-BF26 440W uses PERC Mono Bifacial cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Canadian Solar CS6R 420W achieves 21% module efficiency compared to Aptos Solar DNA-144-BF26 440W's 20.21%, meaning Canadian Solar CS6R 420W converts 0.8 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 Aptos Solar DNA-144-BF26 440W produces 202.1 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 Aptos Solar DNA-144-BF26 440W delivers 440W per panel versus 420W for the Canadian Solar CS6R 420W, a 20W difference per module. To build an 8 kW residential system, you would need 20 Canadian Solar CS6R 420W panels or 19 Aptos Solar DNA-144-BF26 440W panels. Choosing the higher-wattage option saves 1 panel, 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 Canadian Solar CS6R 420W has a temperature coefficient of -0.34%/°C versus -0.35%/°C for the Aptos Solar DNA-144-BF26 440W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Canadian Solar CS6R 420W retains 93.2% of its rated power while the other retains 93.0%. While the numerical gap is modest, it still accumulates over decades of summer production, especially in southern latitudes with prolonged peak heat hours.
Warranty Coverage
The Canadian Solar CS6R 420W is backed by a 12-year product warranty and 25-year performance guarantee, while the Aptos Solar DNA-144-BF26 440W offers 25-year product and 30-year performance coverage. The Aptos Solar DNA-144-BF26 440W 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 0.54%/year for Aptos Solar DNA-144-BF26 440W), after 25 years the Canadian Solar CS6R 420W should retain approximately 86.5% of original output versus 86.0% for the Aptos Solar DNA-144-BF26 440W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Canadian Solar CS6R 420W measures 1722×1134×30mm and weighs 21 kg, while the Aptos Solar DNA-144-BF26 440W measures 2095×1039×40mm at 24.1 kg. 1.95 m² of panel area for the Canadian Solar CS6R 420W versus 2.18 m² for the Aptos Solar DNA-144-BF26 440W. The Canadian Solar CS6R 420W is 3.1 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 62 kg. The more compact Canadian Solar CS6R 420W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Canadian Solar CS6R 420W | Aptos Solar DNA-144-BF26 440W |
|---|---|---|
| Power | 420W | 440W |
| Efficiency | 21% | 20.21% |
| Power Density | 20.0 W/sq ft | 18.8 W/sq ft |
| Cell Type | PERC Mono | PERC Mono Bifacial |
| Bifacial | No | Yes |
| Weight | 21 kg | 24.1 kg |
| Temp Coefficient | -0.34%/°C | -0.35%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 4000 Pa |
| Product Warranty | 12 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.5% | 0.54% |
| Country | China | Vietnam |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Canadian Solar CS6R 420WThe Canadian Solar CS6R 420W achieves 21% efficiency versus 20.21% — a 0.8 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.6 kW more total system capacity, or 3 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Canadian Solar CS6R 420WThe Canadian Solar CS6R 420W has a better temperature coefficient of -0.34%/°C versus -0.35%/°C. On a 45°C summer day (20°C above STC), the winner retains 93.2% of rated power versus 93.0%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: Aptos Solar DNA-144-BF26 440WAptos Solar DNA-144-BF26 440W leads with a 25-year product warranty versus 12 years. Canadian Solar CS6R 420W degrades more slowly at 0.5% per year versus 0.54%. After 25 years, expect 86.5% vs 86.0% of original output for Canadian Solar CS6R 420W and Aptos Solar DNA-144-BF26 440W respectively.
4. Power Output
Winner: Aptos Solar DNA-144-BF26 440WThe Aptos Solar DNA-144-BF26 440W delivers 440W versus 420W per panel — 20W more. For an 8 kW system, you need 19 panels with the higher-wattage option versus 20 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe Canadian Solar CS6R 420W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The Aptos Solar DNA-144-BF26 440W uses PERC Mono Bifacial: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. Both are equivalent-generation technologies.
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
Aptos Solar DNA-144-BF26 440W
Aptos Solar DNA-144-BF26 is a 440W bifacial all-black panel with 144 half-cut cells and up to 30% rear-side energy gain for commercial applications.
Pros
- + Bifacial design with up to 30% additional energy
- + 440W high output with 144 half-cut cells
- + All-black aesthetic
- + 30-year performance warranty
Cons
- - Bifacial gain requires optimized mounting
- - Larger panel dimensions
- - 20.21% efficiency is moderate
Choose Canadian Solar CS6R 420W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ 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
- ✓ Budget residential installations from a bankable Tier 1 brand.
Choose Aptos Solar DNA-144-BF26 440W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ Commercial ground-mount and tracker systems seeking bifacial energy gain with an all-black panel design.
Our Recommendation
The Aptos Solar DNA-144-BF26 440W 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 Aptos Solar DNA-144-BF26 440W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Canadian Solar CS6R 420W or Aptos Solar DNA-144-BF26 440W?
The Aptos Solar DNA-144-BF26 440W wins this comparison by a decisive margin. It delivers more power (440W vs 420W). For most residential installations, the Aptos Solar DNA-144-BF26 440W is the stronger choice.
Which panel is more efficient, Canadian Solar CS6R 420W or Aptos Solar DNA-144-BF26 440W?
The Canadian Solar CS6R 420W at 21% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.8 percentage points translates to approximately 20W per panel under standard test conditions.
Which has a better warranty, Canadian Solar CS6R 420W or Aptos Solar DNA-144-BF26 440W?
The Canadian Solar CS6R 420W comes with a 12-year product warranty and 25-year performance guarantee. The Aptos Solar DNA-144-BF26 440W offers 25-year product and 30-year performance warranties. Aptos Solar DNA-144-BF26 440W 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 Aptos Solar DNA-144-BF26 440W is -0.35%/°C. Canadian Solar CS6R 420W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Canadian Solar CS6R 420W vs Aptos Solar DNA-144-BF26 440W 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 19 Aptos Solar DNA-144-BF26 440W panels (440W each). The Aptos Solar DNA-144-BF26 440W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026