Canadian Solar CS6R 420W vs Tongwei THN-PE14M10 450W
The Tongwei THN-PE14M10 450W wins this comparison by a narrow margin. It leads in efficiency (21.5% vs 21%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the Tongwei THN-PE14M10 450W is the stronger choice.
Key Differences
- • Canadian Solar CS6R 420W is rated at 420W while Tongwei THN-PE14M10 450W is rated at 450W, a 30W difference.
- • Tongwei THN-PE14M10 450W achieves 21.5% efficiency vs 21% for the other, a 0.5 percentage point gap.
- • Both carry matching 12-year product warranties.
Specifications Breakdown
Module Efficiency
The Tongwei THN-PE14M10 450W achieves 21.5% module efficiency compared to Canadian Solar CS6R 420W's 21%, meaning Tongwei THN-PE14M10 450W converts 0.5 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 Tongwei THN-PE14M10 450W produces 225.2 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 Tongwei THN-PE14M10 450W delivers 450W per panel versus 420W for the Canadian Solar CS6R 420W, a 30W difference per module. To build an 8 kW residential system, you would need 20 Canadian Solar CS6R 420W panels or 18 Tongwei THN-PE14M10 450W panels. Choosing the higher-wattage option saves 2 panels, 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 Tongwei THN-PE14M10 450W 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 Tongwei THN-PE14M10 450W), after 25 years the Canadian Solar CS6R 420W should retain approximately 86.5% of original output versus 86.5% for the Tongwei THN-PE14M10 450W. 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 Tongwei THN-PE14M10 450W measures 1762×1134×30mm at 23 kg. 1.95 m² of panel area for the Canadian Solar CS6R 420W versus 2.00 m² for the Tongwei THN-PE14M10 450W. The Canadian Solar CS6R 420W is 2.0 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 40 kg. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Canadian Solar CS6R 420W | Tongwei THN-PE14M10 450W |
|---|---|---|
| Power | 420W | 450W |
| Efficiency | 21% | 21.5% |
| Power Density | 20.0 W/sq ft | 20.9 W/sq ft |
| Cell Type | PERC Mono | PERC Mono |
| Bifacial | No | No |
| Weight | 21 kg | 23 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: Tongwei THN-PE14M10 450WThe Tongwei THN-PE14M10 450W achieves 21.5% efficiency versus 21% — a 0.5 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.9 kW more total system capacity, or 5 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: Tongwei THN-PE14M10 450WThe Tongwei THN-PE14M10 450W delivers 450W versus 420W per panel — 30W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 20 panels, saving 2 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
Tongwei THN-PE14M10 450W
Tongwei's THN-PE14M10 delivers 450W using proven PERC technology at a very competitive price point.
Pros
- + Very competitive pricing
- + Good output for size
- + Strong cell technology
- + Growing brand
Cons
- - Less known outside China
- - Standard warranty
- - Limited US distribution
Choose Canadian Solar CS6R 420W If...
- ✓ Budget residential installations from a bankable Tier 1 brand.
Choose Tongwei THN-PE14M10 450W 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
- ✓ Value-focused projects seeking affordable panels from a major cell producer.
Our Recommendation
Both the Canadian Solar CS6R 420W and Tongwei THN-PE14M10 450W are excellent solar panel options, and the margin between them is narrow. The Tongwei THN-PE14M10 450W 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 Tongwei THN-PE14M10 450W?
The Tongwei THN-PE14M10 450W wins this comparison by a narrow margin. It leads in efficiency (21.5% vs 21%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the Tongwei THN-PE14M10 450W is the stronger choice.
Which panel is more efficient, Canadian Solar CS6R 420W or Tongwei THN-PE14M10 450W?
The Tongwei THN-PE14M10 450W at 21.5% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.5 percentage points translates to approximately 30W per panel under standard test conditions.
Which has a better warranty, Canadian Solar CS6R 420W or Tongwei THN-PE14M10 450W?
The Canadian Solar CS6R 420W comes with a 12-year product warranty and 25-year performance guarantee. The Tongwei THN-PE14M10 450W 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 Tongwei THN-PE14M10 450W is -0.34%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Canadian Solar CS6R 420W vs Tongwei THN-PE14M10 450W 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 18 Tongwei THN-PE14M10 450W panels (450W each). The Tongwei THN-PE14M10 450W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026