Trina Solar Vertex S+ 445W vs Canadian Solar BiHiKu7 670W
The Canadian Solar BiHiKu7 670W wins this comparison by a clear margin. It delivers more power (670W vs 445W). For most residential installations, the Canadian Solar BiHiKu7 670W is the stronger choice.
Key Differences
- • Trina Solar Vertex S+ 445W is rated at 445W while Canadian Solar BiHiKu7 670W is rated at 670W, a 225W difference.
- • Both achieve identical 22.3% module efficiency.
- • Both carry matching 15-year product warranties.
- • Canadian Solar BiHiKu7 670W has a superior temperature coefficient of -0.28%/°C vs -0.29%/°C, retaining more power in hot climates.
- • Trina Solar Vertex S+ 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
Both the Trina Solar Vertex S+ 445W and Canadian Solar BiHiKu7 670W share identical 22.3% module efficiency, producing comparable power per unit area. The Trina Solar Vertex S+ 445W generates 227.9 W/m² while the Canadian Solar BiHiKu7 670W generates 215.7 W/m² based on their respective panel dimensions. With matched efficiency, neither panel holds a density advantage for space-constrained rooftop installations, so other factors like warranty coverage and temperature performance become the deciding metrics.
Power Output
The Canadian Solar BiHiKu7 670W delivers 670W per panel versus 445W for the Trina Solar Vertex S+ 445W, a 225W difference per module. To build an 8 kW residential system, you would need 18 Trina Solar Vertex S+ 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 Trina Solar Vertex S+ 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 Trina Solar Vertex S+ 445W is backed by a 15-year product warranty and 30-year performance guarantee, while the Canadian Solar BiHiKu7 670W offers 15-year product and 30-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1% first year then 0.4%/year for Trina Solar Vertex S+ 445W; 1% first year then 0.4%/year for Canadian Solar BiHiKu7 670W), after 25 years the Trina Solar Vertex S+ 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 Trina Solar Vertex S+ 445W measures 1722×1134×30mm and weighs 21.3 kg, while the Canadian Solar BiHiKu7 670W measures 2384×1303×35mm at 34.5 kg. 1.95 m² of panel area for the Trina Solar Vertex S+ 445W versus 3.11 m² for the Canadian Solar BiHiKu7 670W. The Trina Solar Vertex S+ 445W is 13.2 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 264 kg. The more compact Trina Solar Vertex S+ 445W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Trina Solar Vertex S+ 445W | Canadian Solar BiHiKu7 670W |
|---|---|---|
| Power | 445W | 670W |
| Efficiency | 22.3% | 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 | 21.3 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 | 15 years | 15 years |
| Performance Warranty | 30 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: TieBoth panels achieve 22.3% module efficiency, producing identical power per square meter. Neither has an advantage in space-constrained installations.
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: TieBoth panels offer identical 15-year product warranties and 0.4% annual degradation. Neither has a durability advantage.
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 Trina Solar Vertex S+ 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.
Trina Solar Vertex S+ 445W
The Trina Vertex S+ delivers 445W using N-type TOPCon technology in a compact residential format with excellent all-round performance.
Pros
- + Compact residential size
- + Strong N-type efficiency
- + Good shade tolerance
- + 30-year performance warranty
Cons
- - Moderate weight
- - Not the highest wattage option
- - Limited color options
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 Trina Solar Vertex S+ 445W If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Residential rooftops with moderate space requiring high efficiency.
Choose Canadian Solar BiHiKu7 670W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Utility-scale and large commercial ground-mount projects.
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 Trina Solar Vertex S+ 445W 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, Trina Solar Vertex S+ 445W or Canadian Solar BiHiKu7 670W?
The Canadian Solar BiHiKu7 670W wins this comparison by a clear margin. It delivers more power (670W vs 445W). For most residential installations, the Canadian Solar BiHiKu7 670W is the stronger choice.
Which panel is more efficient, Trina Solar Vertex S+ 445W or Canadian Solar BiHiKu7 670W?
The both panels share 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 0.0 percentage points translates to approximately 225W per panel under standard test conditions.
Which has a better warranty, Trina Solar Vertex S+ 445W or Canadian Solar BiHiKu7 670W?
The Trina Solar Vertex S+ 445W comes with a 15-year product warranty and 30-year performance guarantee. The Canadian Solar BiHiKu7 670W offers 15-year product and 30-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Trina Solar Vertex S+ 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 Trina Solar Vertex S+ 445W vs Canadian Solar BiHiKu7 670W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 Trina Solar Vertex S+ 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