Canadian Solar CS6R 420W vs Maxeon Maxeon 6 425W
The Maxeon Maxeon 6 425W wins this comparison by a decisive margin. It leads in efficiency (22.2% vs 21%) and matches or exceeds on warranty (40 vs 12 years). For most residential installations, the Maxeon Maxeon 6 425W is the stronger choice.
Key Differences
- • Canadian Solar CS6R 420W is rated at 420W while Maxeon Maxeon 6 425W is rated at 425W, a 5W difference.
- • Maxeon Maxeon 6 425W achieves 22.2% efficiency vs 21% for the other, a 1.2 percentage point gap.
- • Maxeon Maxeon 6 425W comes with a 40-year product warranty vs 12 years for the other.
- • Maxeon Maxeon 6 425W has a superior temperature coefficient of -0.27%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Canadian Solar CS6R 420W uses PERC Mono cells while Maxeon Maxeon 6 425W uses IBC (Interdigitated Back Contact) cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Maxeon Maxeon 6 425W achieves 22.2% module efficiency compared to Canadian Solar CS6R 420W's 21%, meaning Maxeon Maxeon 6 425W converts 1.2 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 Maxeon Maxeon 6 425W produces 220.0 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 Maxeon Maxeon 6 425W delivers 425W per panel versus 420W for the Canadian Solar CS6R 420W, a 5W difference per module. To build an 8 kW residential system, you would need 20 Canadian Solar CS6R 420W panels or 19 Maxeon Maxeon 6 425W 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 Maxeon Maxeon 6 425W has a temperature coefficient of -0.27%/°C versus -0.34%/°C for the Canadian Solar CS6R 420W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Maxeon Maxeon 6 425W retains 94.6% 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 Canadian Solar CS6R 420W is backed by a 12-year product warranty and 25-year performance guarantee, while the Maxeon Maxeon 6 425W offers 40-year product and 40-year performance coverage. The Maxeon Maxeon 6 425W provides 28 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; 0.25% first year then 0.25%/year for Maxeon Maxeon 6 425W), after 25 years the Canadian Solar CS6R 420W should retain approximately 86.5% of original output versus 93.8% for the Maxeon Maxeon 6 425W. This 7.3 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 Maxeon Maxeon 6 425W measures 1872×1032×30mm at 20.5 kg. 1.95 m² of panel area for the Canadian Solar CS6R 420W versus 1.93 m² for the Maxeon Maxeon 6 425W. 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 | Maxeon Maxeon 6 425W |
|---|---|---|
| Power | 420W | 425W |
| Efficiency | 21% | 22.2% |
| Power Density | 20.0 W/sq ft | 20.4 W/sq ft |
| Cell Type | PERC Mono | IBC (Interdigitated Back Contact) |
| Bifacial | No | Yes |
| Weight | 21 kg | 20.5 kg |
| Temp Coefficient | -0.34%/°C | -0.27%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 3600 Pa |
| Product Warranty | 12 years | 40 years |
| Performance Warranty | 25 years | 40 years |
| Degradation (Year 1) | 1.5% | 0.25% |
| Annual Degradation | 0.5% | 0.25% |
| Country | China | Malaysia |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Maxeon Maxeon 6 425WThe Maxeon Maxeon 6 425W achieves 22.2% efficiency versus 21% — a 1.2 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.1 kW more total system capacity, or 1 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Maxeon Maxeon 6 425WThe Maxeon Maxeon 6 425W has a better temperature coefficient of -0.27%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.6% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Maxeon Maxeon 6 425WMaxeon Maxeon 6 425W leads with a 40-year product warranty versus 12 years. Maxeon Maxeon 6 425W degrades more slowly at 0.25% per year versus 0.5%. After 25 years, expect 86.5% vs 93.8% of original output for Canadian Solar CS6R 420W and Maxeon Maxeon 6 425W respectively.
4. Power Output
Winner: Maxeon Maxeon 6 425WThe Maxeon Maxeon 6 425W delivers 425W versus 420W per panel — 5W 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: Maxeon Maxeon 6 425WThe 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 Maxeon Maxeon 6 425W uses IBC (Interdigitated Back Contact): IBC (Interdigitated Back Contact) moves all electrical contacts to the rear of the cell, maximizing front-side light capture for the highest possible efficiency. IBC (Interdigitated Back Contact) represents a newer generation technology with a longer performance runway as manufacturing matures.
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
Maxeon Maxeon 6 425W
The Maxeon 6 delivers 425W with 22.2% efficiency and the same industry-leading 40-year warranty as the Maxeon 7 series.
Pros
- + 40-year complete warranty
- + 22.2% IBC efficiency
- + Excellent aesthetics
- + Ultra-low degradation
Cons
- - Very high cost per watt
- - Limited installer network
- - Fewer wattage options
Choose Canadian Solar CS6R 420W If...
- ✓ Budget residential installations from a bankable Tier 1 brand.
Choose Maxeon Maxeon 6 425W 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
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 40+ years
- ✓ 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
Our Recommendation
The Maxeon Maxeon 6 425W is the decisive winner in this solar panel comparison, outperforming the Canadian Solar CS6R 420W in 5 of 5 dimensions. Unless you have a specific requirement that the Canadian Solar CS6R 420W uniquely addresses, the Maxeon Maxeon 6 425W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Canadian Solar CS6R 420W or Maxeon Maxeon 6 425W?
The Maxeon Maxeon 6 425W wins this comparison by a decisive margin. It leads in efficiency (22.2% vs 21%) and matches or exceeds on warranty (40 vs 12 years). For most residential installations, the Maxeon Maxeon 6 425W is the stronger choice.
Which panel is more efficient, Canadian Solar CS6R 420W or Maxeon Maxeon 6 425W?
The Maxeon Maxeon 6 425W 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 1.2 percentage points translates to approximately 5W per panel under standard test conditions.
Which has a better warranty, Canadian Solar CS6R 420W or Maxeon Maxeon 6 425W?
The Canadian Solar CS6R 420W comes with a 12-year product warranty and 25-year performance guarantee. The Maxeon Maxeon 6 425W offers 40-year product and 40-year performance warranties. Maxeon Maxeon 6 425W provides 28 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 Maxeon Maxeon 6 425W is -0.27%/°C. Maxeon Maxeon 6 425W 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 Maxeon Maxeon 6 425W 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 Maxeon Maxeon 6 425W panels (425W each). The Maxeon Maxeon 6 425W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026