Canadian Solar CS6R 420W vs Seraphim S4 Series 430W
The Seraphim S4 Series 430W wins this comparison by a narrow margin. It leads in efficiency (21.2% vs 21%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the Seraphim S4 Series 430W is the stronger choice.
Key Differences
- • Canadian Solar CS6R 420W is rated at 420W while Seraphim S4 Series 430W is rated at 430W, a 10W difference.
- • Seraphim S4 Series 430W achieves 21.2% efficiency vs 21% for the other, a 0.2 percentage point gap.
- • Both carry matching 12-year product warranties.
Specifications Breakdown
Module Efficiency
The Seraphim S4 Series 430W achieves 21.2% module efficiency compared to Canadian Solar CS6R 420W's 21%, meaning Seraphim S4 Series 430W 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 Seraphim S4 Series 430W produces 220.2 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 Seraphim S4 Series 430W delivers 430W per panel versus 420W for the Canadian Solar CS6R 420W, a 10W difference per module. To build an 8 kW residential system, you would need 20 Canadian Solar CS6R 420W panels or 19 Seraphim S4 Series 430W 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
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 Seraphim S4 Series 430W offers 12-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1.5% first year then 0.5%/year for Canadian Solar CS6R 420W; 1.5% first year then 0.5%/year for Seraphim S4 Series 430W), after 25 years the Canadian Solar CS6R 420W should retain approximately 86.5% of original output versus 86.5% for the Seraphim S4 Series 430W. 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 Seraphim S4 Series 430W 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 Seraphim S4 Series 430W. 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 | Seraphim S4 Series 430W |
|---|---|---|
| Power | 420W | 430W |
| Efficiency | 21% | 21.2% |
| Power Density | 20.0 W/sq ft | 20.5 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 | 12 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1.5% | 1.5% |
| Annual Degradation | 0.5% | 0.5% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Seraphim S4 Series 430WThe Seraphim S4 Series 430W 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: TieBoth panels offer identical 12-year product warranties and 0.5% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Seraphim S4 Series 430WThe Seraphim S4 Series 430W delivers 430W versus 420W per panel — 10W 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: 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
Seraphim S4 Series 430W
The Seraphim S4 Series delivers 430W using proven PERC technology at a competitive price point for residential installations.
Pros
- + Competitive pricing
- + Proven PERC technology
- + Compact design
- + Good value
Cons
- - Standard PERC efficiency
- - Shorter warranty period
- - Limited US presence
Choose Canadian Solar CS6R 420W If...
- ✓ Budget residential installations from a bankable Tier 1 brand.
Choose Seraphim S4 Series 430W 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
- ✓ Budget residential installations seeking competitive PERC pricing.
Our Recommendation
Both the Canadian Solar CS6R 420W and Seraphim S4 Series 430W are excellent solar panel options, and the margin between them is narrow. The Seraphim S4 Series 430W wins 2 of 5 comparison dimensions by a slim margin. Your decision may come down to local pricing, installer availability, and which specific performance metrics matter most for your project. Either product is a solid investment.
Frequently Asked Questions
Which is better, Canadian Solar CS6R 420W or Seraphim S4 Series 430W?
The Seraphim S4 Series 430W wins this comparison by a narrow margin. It leads in efficiency (21.2% vs 21%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the Seraphim S4 Series 430W is the stronger choice.
Which panel is more efficient, Canadian Solar CS6R 420W or Seraphim S4 Series 430W?
The Seraphim S4 Series 430W 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 Seraphim S4 Series 430W?
The Canadian Solar CS6R 420W comes with a 12-year product warranty and 25-year performance guarantee. The Seraphim S4 Series 430W offers 12-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Canadian Solar CS6R 420W has a temperature coefficient of -0.34%/°C and the Seraphim S4 Series 430W is -0.34%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Canadian Solar CS6R 420W vs Seraphim S4 Series 430W 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 Seraphim S4 Series 430W panels (430W each). The Seraphim S4 Series 430W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026