Canadian Solar BiHiKu7 670W vs LONGi Hi-MO 7 620W
The Canadian Solar BiHiKu7 670W wins this comparison by a clear margin. It delivers more power (670W vs 620W). For most residential installations, the Canadian Solar BiHiKu7 670W is the stronger choice.
Key Differences
- • Canadian Solar BiHiKu7 670W is rated at 670W while LONGi Hi-MO 7 620W is rated at 620W, a 50W difference.
- • LONGi Hi-MO 7 620W achieves 23% efficiency vs 22.3% for the other, a 0.7 percentage point gap.
- • Canadian Solar BiHiKu7 670W comes with a 15-year product warranty vs 12 years for the other.
- • Canadian Solar BiHiKu7 670W uses TOPCon N-type Bifacial cells while LONGi Hi-MO 7 620W uses HPBC (Back Contact N-type) cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO 7 620W achieves 23% module efficiency compared to Canadian Solar BiHiKu7 670W's 22.3%, meaning LONGi Hi-MO 7 620W converts 0.7 percentage points more sunlight into electricity per square meter. In practical terms, the Canadian Solar BiHiKu7 670W produces 215.7 watts per square meter of panel area while the LONGi Hi-MO 7 620W produces 229.3 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 620W for the LONGi Hi-MO 7 620W, a 50W difference per module. To build an 8 kW residential system, you would need 12 Canadian Solar BiHiKu7 670W panels or 13 LONGi Hi-MO 7 620W 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 -0.28%/°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 94.4% 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 BiHiKu7 670W is backed by a 15-year product warranty and 30-year performance guarantee, while the LONGi Hi-MO 7 620W offers 12-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 Canadian Solar BiHiKu7 670W; 0.5% first year then 0.35%/year for LONGi Hi-MO 7 620W), after 25 years the Canadian Solar BiHiKu7 670W should retain approximately 89.4% of original output versus 91.1% for the LONGi Hi-MO 7 620W. This 1.7 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Canadian Solar BiHiKu7 670W measures 2384×1303×35mm and weighs 34.5 kg, while the LONGi Hi-MO 7 620W measures 2384×1134×35mm at 31 kg. 3.11 m² of panel area for the Canadian Solar BiHiKu7 670W versus 2.70 m² for the LONGi Hi-MO 7 620W. The LONGi Hi-MO 7 620W is 3.5 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 70 kg. The more compact LONGi Hi-MO 7 620W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Canadian Solar BiHiKu7 670W | LONGi Hi-MO 7 620W |
|---|---|---|
| Power | 670W | 620W |
| Efficiency | 22.3% | 23% |
| Power Density | 20.0 W/sq ft | 21.3 W/sq ft |
| Cell Type | TOPCon N-type Bifacial | HPBC (Back Contact N-type) |
| Bifacial | Yes | Yes |
| Weight | 34.5 kg | 31 kg |
| Temp Coefficient | -0.28%/°C | -0.28%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 15 years | 12 years |
| Performance Warranty | 30 years | 30 years |
| Degradation (Year 1) | 1% | 0.5% |
| Annual Degradation | 0.4% | 0.35% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: LONGi Hi-MO 7 620WThe LONGi Hi-MO 7 620W achieves 23% efficiency versus 22.3% — a 0.7 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: TieBoth panels share a temperature coefficient of -0.28%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: Canadian Solar BiHiKu7 670WCanadian Solar BiHiKu7 670W leads with a 15-year product warranty versus 12 years. LONGi Hi-MO 7 620W degrades more slowly at 0.35% per year versus 0.4%. After 25 years, expect 89.4% vs 91.1% of original output for Canadian Solar BiHiKu7 670W and LONGi Hi-MO 7 620W respectively.
4. Power Output
Winner: Canadian Solar BiHiKu7 670WThe Canadian Solar BiHiKu7 670W delivers 670W versus 620W per panel — 50W more. For an 8 kW system, you need 12 panels with the higher-wattage option versus 13 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: LONGi Hi-MO 7 620WThe 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. The LONGi Hi-MO 7 620W uses HPBC (Back Contact N-type): HPBC (Hybrid Passivated Back Contact) is a proprietary LONGi architecture combining back-contact design with advanced passivation for both high efficiency and aesthetic uniformity. HPBC (Back Contact N-type) represents a newer generation technology with a longer performance runway as manufacturing matures.
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
LONGi Hi-MO 7 620W
The Hi-MO 7 620W is LONGi's highest-output panel using proprietary HPBC (Hybrid Passivated Back Contact) technology for exceptional efficiency. Newer LR7/LR8 variants support 620W+ output.
Pros
- + Highest LONGi output
- + HPBC cutting-edge back-contact technology
- + 23.0% efficiency
- + Excellent degradation profile
Cons
- - Very large form factor
- - Premium pricing
- - New technology
Choose Canadian Solar BiHiKu7 670W If...
- ✓ 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 prefer newer cell technology with a longer performance improvement runway
- ✓ Utility-scale and large commercial ground-mount projects.
Choose LONGi Hi-MO 7 620W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want maximum output retention over the system's 25-30 year lifespan
- ✓ Large installations wanting LONGi's most advanced HPBC technology.
Our Recommendation
We recommend the Canadian Solar BiHiKu7 670W for most buyers in this comparison. It wins 2 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The LONGi Hi-MO 7 620W remains a good product, but the Canadian Solar BiHiKu7 670W delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Canadian Solar BiHiKu7 670W or LONGi Hi-MO 7 620W?
The Canadian Solar BiHiKu7 670W wins this comparison by a clear margin. It delivers more power (670W vs 620W). For most residential installations, the Canadian Solar BiHiKu7 670W is the stronger choice.
Which panel is more efficient, Canadian Solar BiHiKu7 670W or LONGi Hi-MO 7 620W?
The LONGi Hi-MO 7 620W at 23% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.7 percentage points translates to approximately 50W per panel under standard test conditions.
Which has a better warranty, Canadian Solar BiHiKu7 670W or LONGi Hi-MO 7 620W?
The Canadian Solar BiHiKu7 670W comes with a 15-year product warranty and 30-year performance guarantee. The LONGi Hi-MO 7 620W offers 12-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 Canadian Solar BiHiKu7 670W has a temperature coefficient of -0.28%/°C and the LONGi Hi-MO 7 620W is -0.28%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Canadian Solar BiHiKu7 670W vs LONGi Hi-MO 7 620W panels do I need for an 8 kW system?
For an 8 kW system: you need 12 Canadian Solar BiHiKu7 670W panels (670W each) or 13 LONGi Hi-MO 7 620W panels (620W each). The Canadian Solar BiHiKu7 670W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026