Canadian Solar CS6R 420W vs LONGi Hi-MO X6 Max 470W
The LONGi Hi-MO X6 Max 470W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 21%) and matches or exceeds on warranty (15 vs 12 years). For most residential installations, the LONGi Hi-MO X6 Max 470W is the stronger choice.
Key Differences
- • Canadian Solar CS6R 420W is rated at 420W while LONGi Hi-MO X6 Max 470W is rated at 470W, a 50W difference.
- • LONGi Hi-MO X6 Max 470W achieves 22.3% efficiency vs 21% for the other, a 1.3 percentage point gap.
- • LONGi Hi-MO X6 Max 470W comes with a 15-year product warranty vs 12 years for the other.
- • LONGi Hi-MO X6 Max 470W has a superior temperature coefficient of -0.29%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Canadian Solar CS6R 420W uses PERC Mono cells while LONGi Hi-MO X6 Max 470W uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO X6 Max 470W achieves 22.3% module efficiency compared to Canadian Solar CS6R 420W's 21%, meaning LONGi Hi-MO X6 Max 470W converts 1.3 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 LONGi Hi-MO X6 Max 470W produces 235.2 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 LONGi Hi-MO X6 Max 470W delivers 470W per panel versus 420W for the Canadian Solar CS6R 420W, a 50W difference per module. To build an 8 kW residential system, you would need 20 Canadian Solar CS6R 420W panels or 18 LONGi Hi-MO X6 Max 470W 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
The LONGi Hi-MO X6 Max 470W has a temperature coefficient of -0.29%/°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 LONGi Hi-MO X6 Max 470W retains 94.2% 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 LONGi Hi-MO X6 Max 470W offers 15-year product and 30-year performance coverage. The LONGi Hi-MO X6 Max 470W provides 3 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 LONGi Hi-MO X6 Max 470W), after 25 years the Canadian Solar CS6R 420W should retain approximately 86.5% of original output versus 89.4% for the LONGi Hi-MO X6 Max 470W. 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 LONGi Hi-MO X6 Max 470W measures 1762×1134×30mm at 23.5 kg. 1.95 m² of panel area for the Canadian Solar CS6R 420W versus 2.00 m² for the LONGi Hi-MO X6 Max 470W. The Canadian Solar CS6R 420W is 2.5 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 50 kg. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Canadian Solar CS6R 420W | LONGi Hi-MO X6 Max 470W |
|---|---|---|
| Power | 420W | 470W |
| Efficiency | 21% | 22.3% |
| Power Density | 20.0 W/sq ft | 21.9 W/sq ft |
| Cell Type | PERC Mono | TOPCon N-type |
| Bifacial | No | Yes |
| Weight | 21 kg | 23.5 kg |
| Temp Coefficient | -0.34%/°C | -0.29%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 15 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.5% | 0.4% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: LONGi Hi-MO X6 Max 470WThe LONGi Hi-MO X6 Max 470W achieves 22.3% efficiency versus 21% — a 1.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.5 kW more total system capacity, or 7 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: LONGi Hi-MO X6 Max 470WThe LONGi Hi-MO X6 Max 470W has a better temperature coefficient of -0.29%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: LONGi Hi-MO X6 Max 470WLONGi Hi-MO X6 Max 470W leads with a 15-year product warranty versus 12 years. LONGi Hi-MO X6 Max 470W 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 LONGi Hi-MO X6 Max 470W respectively.
4. Power Output
Winner: LONGi Hi-MO X6 Max 470WThe LONGi Hi-MO X6 Max 470W delivers 470W versus 420W per panel — 50W 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: LONGi Hi-MO X6 Max 470WThe 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 LONGi Hi-MO X6 Max 470W uses TOPCon N-type: TOPCon (Tunnel Oxide Passivated Contact) adds a thin tunnel oxide layer to reduce recombination losses, achieving higher efficiency than PERC while being manufacturable on existing production lines. TOPCon N-type 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
LONGi Hi-MO X6 Max 470W
The Hi-MO X6 Max delivers 470W in a mid-size format with N-type TOPCon technology, bridging the gap between compact and large panels.
Pros
- + Mid-size versatility
- + N-type TOPCon efficiency
- + Good power-to-size ratio
- + LONGi reliability
Cons
- - Mid-range pricing
- - Not the highest output
- - Standard warranty
Choose Canadian Solar CS6R 420W If...
- ✓ Budget residential installations from a bankable Tier 1 brand.
Choose LONGi Hi-MO X6 Max 470W 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 15+ 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 LONGi Hi-MO X6 Max 470W 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 LONGi Hi-MO X6 Max 470W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Canadian Solar CS6R 420W or LONGi Hi-MO X6 Max 470W?
The LONGi Hi-MO X6 Max 470W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 21%) and matches or exceeds on warranty (15 vs 12 years). For most residential installations, the LONGi Hi-MO X6 Max 470W is the stronger choice.
Which panel is more efficient, Canadian Solar CS6R 420W or LONGi Hi-MO X6 Max 470W?
The LONGi Hi-MO X6 Max 470W at 22.3% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.3 percentage points translates to approximately 50W per panel under standard test conditions.
Which has a better warranty, Canadian Solar CS6R 420W or LONGi Hi-MO X6 Max 470W?
The Canadian Solar CS6R 420W comes with a 12-year product warranty and 25-year performance guarantee. The LONGi Hi-MO X6 Max 470W offers 15-year product and 30-year performance warranties. LONGi Hi-MO X6 Max 470W provides 3 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 LONGi Hi-MO X6 Max 470W is -0.29%/°C. LONGi Hi-MO X6 Max 470W 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 LONGi Hi-MO X6 Max 470W 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 LONGi Hi-MO X6 Max 470W panels (470W each). The LONGi Hi-MO X6 Max 470W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026