LONGi Hi-MO X6 445W vs Canadian Solar BiHiKu7 670W
The Canadian Solar BiHiKu7 670W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 22%) and matches or exceeds on warranty (15 vs 12 years). For most residential installations, the Canadian Solar BiHiKu7 670W is the stronger choice.
Key Differences
- • LONGi Hi-MO X6 445W is rated at 445W while Canadian Solar BiHiKu7 670W is rated at 670W, a 225W difference.
- • Canadian Solar BiHiKu7 670W achieves 22.3% efficiency vs 22% for the other, a 0.3 percentage point gap.
- • Canadian Solar BiHiKu7 670W comes with a 15-year product warranty vs 12 years for the other.
- • Canadian Solar BiHiKu7 670W has a superior temperature coefficient of -0.28%/°C vs -0.29%/°C, retaining more power in hot climates.
- • LONGi Hi-MO X6 445W uses TOPCon N-type cells while Canadian Solar BiHiKu7 670W uses TOPCon N-type Bifacial cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Canadian Solar BiHiKu7 670W achieves 22.3% module efficiency compared to LONGi Hi-MO X6 445W's 22%, meaning Canadian Solar BiHiKu7 670W converts 0.3 percentage points more sunlight into electricity per square meter. In practical terms, the LONGi Hi-MO X6 445W produces 227.9 watts per square meter of panel area while the Canadian Solar BiHiKu7 670W produces 215.7 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 Canadian Solar BiHiKu7 670W delivers 670W per panel versus 445W for the LONGi Hi-MO X6 445W, a 225W difference per module. To build an 8 kW residential system, you would need 18 LONGi Hi-MO X6 445W panels or 12 Canadian Solar BiHiKu7 670W panels. Choosing the higher-wattage option saves 6 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 Canadian Solar BiHiKu7 670W has a temperature coefficient of -0.28%/°C versus -0.29%/°C for the LONGi Hi-MO X6 445W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Canadian Solar BiHiKu7 670W retains 94.4% of its rated power while the other retains 94.2%. 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 LONGi Hi-MO X6 445W is backed by a 12-year product warranty and 25-year performance guarantee, while the Canadian Solar BiHiKu7 670W offers 15-year product and 30-year performance coverage. The Canadian Solar BiHiKu7 670W provides 3 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1% first year then 0.4%/year for LONGi Hi-MO X6 445W; 1% first year then 0.4%/year for Canadian Solar BiHiKu7 670W), after 25 years the LONGi Hi-MO X6 445W should retain approximately 89.4% of original output versus 89.4% for the Canadian Solar BiHiKu7 670W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The LONGi Hi-MO X6 445W measures 1722×1134×30mm and weighs 21.5 kg, while the Canadian Solar BiHiKu7 670W measures 2384×1303×35mm at 34.5 kg. 1.95 m² of panel area for the LONGi Hi-MO X6 445W versus 3.11 m² for the Canadian Solar BiHiKu7 670W. The LONGi Hi-MO X6 445W is 13.0 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 260 kg. The more compact LONGi Hi-MO X6 445W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | LONGi Hi-MO X6 445W | Canadian Solar BiHiKu7 670W |
|---|---|---|
| Power | 445W | 670W |
| Efficiency | 22% | 22.3% |
| Power Density | 21.2 W/sq ft | 20.0 W/sq ft |
| Cell Type | TOPCon N-type | TOPCon N-type Bifacial |
| Bifacial | Yes | Yes |
| Weight | 21.5 kg | 34.5 kg |
| Temp Coefficient | -0.29%/°C | -0.28%/°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% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Canadian Solar BiHiKu7 670WThe Canadian Solar BiHiKu7 670W achieves 22.3% efficiency versus 22% — a 0.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 6.8 kW more total system capacity, or 31 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Canadian Solar BiHiKu7 670WThe Canadian Solar BiHiKu7 670W has a better temperature coefficient of -0.28%/°C versus -0.29%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.4% of rated power versus 94.2%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: Canadian Solar BiHiKu7 670WCanadian Solar BiHiKu7 670W leads with a 15-year product warranty versus 12 years. After 25 years, expect 89.4% vs 89.4% of original output for LONGi Hi-MO X6 445W and Canadian Solar BiHiKu7 670W respectively.
4. Power Output
Winner: Canadian Solar BiHiKu7 670WThe Canadian Solar BiHiKu7 670W delivers 670W versus 445W per panel — 225W more. For an 8 kW system, you need 12 panels with the higher-wattage option versus 18 panels, saving 6 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe LONGi Hi-MO X6 445W 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. The Canadian Solar BiHiKu7 670W uses TOPCon N-type Bifacial: 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. Both are equivalent-generation technologies.
LONGi Hi-MO X6 445W
The Hi-MO X6 is LONGi's TOPCon N-type line offering 445W in a compact format, well-suited for space-constrained residential rooftops.
Pros
- + Compact size for residential roofs
- + Good N-type TOPCon efficiency
- + Advanced technology
- + Budget-friendly
Cons
- - Lower wattage than larger models
- - Mid-range efficiency for N-type
- - Less suited for very large roofs
Canadian Solar BiHiKu7 670W
The BiHiKu7 is Canadian Solar's most powerful bifacial module at 670W, designed for utility-scale and large commercial projects.
Pros
- + Highest wattage available
- + Bifacial energy gain
- + Excellent for tracking systems
- + Low LCOE
Cons
- - Extremely large panel
- - Not for residential roofs
- - Very heavy at 34.5 kg
Choose LONGi Hi-MO X6 445W If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Homeowners wanting N-type TOPCon technology in a compact residential format.
Choose Canadian Solar BiHiKu7 670W 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 prefer newer cell technology with a longer performance improvement runway
Our Recommendation
The Canadian Solar BiHiKu7 670W is the decisive winner in this solar panel comparison, outperforming the LONGi Hi-MO X6 445W in 4 of 5 dimensions. Unless you have a specific requirement that the LONGi Hi-MO X6 445W uniquely addresses, the Canadian Solar BiHiKu7 670W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, LONGi Hi-MO X6 445W or Canadian Solar BiHiKu7 670W?
The Canadian Solar BiHiKu7 670W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 22%) and matches or exceeds on warranty (15 vs 12 years). For most residential installations, the Canadian Solar BiHiKu7 670W is the stronger choice.
Which panel is more efficient, LONGi Hi-MO X6 445W or Canadian Solar BiHiKu7 670W?
The Canadian Solar BiHiKu7 670W 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 0.3 percentage points translates to approximately 225W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO X6 445W or Canadian Solar BiHiKu7 670W?
The LONGi Hi-MO X6 445W comes with a 12-year product warranty and 25-year performance guarantee. The Canadian Solar BiHiKu7 670W offers 15-year product and 30-year performance warranties. Canadian Solar BiHiKu7 670W provides 3 additional years of product coverage.
Which panel performs better in hot weather?
The LONGi Hi-MO X6 445W has a temperature coefficient of -0.29%/°C and the Canadian Solar BiHiKu7 670W is -0.28%/°C. Canadian Solar BiHiKu7 670W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many LONGi Hi-MO X6 445W vs Canadian Solar BiHiKu7 670W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 LONGi Hi-MO X6 445W panels (445W each) or 12 Canadian Solar BiHiKu7 670W panels (670W each). The Canadian Solar BiHiKu7 670W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026