Canadian Solar BiHiKu7 670W vs Waaree WS-545 Bifacial
The Canadian Solar BiHiKu7 670W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 21.2%) 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
- • Canadian Solar BiHiKu7 670W is rated at 670W while Waaree WS-545 Bifacial is rated at 545W, a 125W difference.
- • Canadian Solar BiHiKu7 670W achieves 22.3% efficiency vs 21.2% for the other, a 1.1 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 -0.3%/°C, retaining more power in hot climates.
Specifications Breakdown
Module Efficiency
The Canadian Solar BiHiKu7 670W achieves 22.3% module efficiency compared to Waaree WS-545 Bifacial's 21.2%, meaning Canadian Solar BiHiKu7 670W converts 1.1 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 Waaree WS-545 Bifacial produces 211.0 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 545W for the Waaree WS-545 Bifacial, a 125W difference per module. To build an 8 kW residential system, you would need 12 Canadian Solar BiHiKu7 670W panels or 15 Waaree WS-545 Bifacial panels. Choosing the higher-wattage option saves 3 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 -0.3%/°C for the Waaree WS-545 Bifacial. 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 94.0%. 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 Canadian Solar BiHiKu7 670W is backed by a 15-year product warranty and 30-year performance guarantee, while the Waaree WS-545 Bifacial 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; 1% first year then 0.4%/year for Waaree WS-545 Bifacial), after 25 years the Canadian Solar BiHiKu7 670W should retain approximately 89.4% of original output versus 89.4% for the Waaree WS-545 Bifacial. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Canadian Solar BiHiKu7 670W measures 2384×1303×35mm and weighs 34.5 kg, while the Waaree WS-545 Bifacial measures 2278×1134×35mm at 28 kg. 3.11 m² of panel area for the Canadian Solar BiHiKu7 670W versus 2.58 m² for the Waaree WS-545 Bifacial. The Waaree WS-545 Bifacial is 6.5 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 130 kg. The more compact Waaree WS-545 Bifacial may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Canadian Solar BiHiKu7 670W | Waaree WS-545 Bifacial |
|---|---|---|
| Power | 670W | 545W |
| Efficiency | 22.3% | 21.2% |
| Power Density | 20.0 W/sq ft | 19.6 W/sq ft |
| Cell Type | TOPCon N-type Bifacial | TOPCon N-type Bifacial |
| Bifacial | Yes | Yes |
| Weight | 34.5 kg | 28 kg |
| Temp Coefficient | -0.28%/°C | -0.3%/°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% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | China | India |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Canadian Solar BiHiKu7 670WThe Canadian Solar BiHiKu7 670W achieves 22.3% efficiency versus 21.2% — a 1.1 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 3.8 kW more total system capacity, or 17 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 -0.3%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.4% of rated power versus 94.0%. 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 Canadian Solar BiHiKu7 670W and Waaree WS-545 Bifacial respectively.
4. Power Output
Winner: Canadian Solar BiHiKu7 670WThe Canadian Solar BiHiKu7 670W delivers 670W versus 545W per panel — 125W more. For an 8 kW system, you need 12 panels with the higher-wattage option versus 15 panels, saving 3 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieBoth panels use TOPCon N-type Bifacial cell technology. No technology advantage for either product.
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
Waaree WS-545 Bifacial
The Waaree WS-545 Bifacial is a 545W TOPCon N-type bifacial panel from India's largest solar module manufacturer. Waaree Energies has rapidly scaled to become a top-10 global solar manufacturer, and the WS-545 represents their flagship utility and commercial product. The bifacial design captures reflected light from the rear side for 5-25% additional energy gain depending on ground albedo. The N-type TOPCon cells deliver -0.30%/°C temperature coefficient and lower degradation than PERC. Waaree's Indian manufacturing provides an alternative supply chain to Chinese panels, particularly relevant for markets implementing anti-dumping duties.
Pros
- + Indian manufacturing — alternative to Chinese supply chain
- + Bifacial design adds 5-25% energy gain from rear side
- + TOPCon N-type with -0.30%/°C temp coefficient
- + Competitive pricing — among the most affordable TOPCon bifacial panels
- + 30-year performance warranty with low 0.4% annual degradation
- + Waaree is India's largest module manufacturer with 12+ GW capacity
Cons
- - Limited US brand recognition and distribution
- - 12-year product warranty shorter than premium brands' 25 years
- - 545W is mid-range — Chinese competitors offer 580W+ in same size
- - Bifacial gain requires appropriate mounting (ground or elevated rack)
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
Choose Waaree WS-545 Bifacial If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Commercial and utility-scale projects seeking cost-effective TOPCon bifacial panels from a non-Chinese supply chain, and ground-mount residential systems where bifacial gain is maximized.
Our Recommendation
The Canadian Solar BiHiKu7 670W is the decisive winner in this solar panel comparison, outperforming the Waaree WS-545 Bifacial in 4 of 5 dimensions. Unless you have a specific requirement that the Waaree WS-545 Bifacial uniquely addresses, the Canadian Solar BiHiKu7 670W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Canadian Solar BiHiKu7 670W or Waaree WS-545 Bifacial?
The Canadian Solar BiHiKu7 670W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 21.2%) 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, Canadian Solar BiHiKu7 670W or Waaree WS-545 Bifacial?
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 1.1 percentage points translates to approximately 125W per panel under standard test conditions.
Which has a better warranty, Canadian Solar BiHiKu7 670W or Waaree WS-545 Bifacial?
The Canadian Solar BiHiKu7 670W comes with a 15-year product warranty and 30-year performance guarantee. The Waaree WS-545 Bifacial 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 Waaree WS-545 Bifacial is -0.3%/°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 Canadian Solar BiHiKu7 670W vs Waaree WS-545 Bifacial 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 15 Waaree WS-545 Bifacial panels (545W each). The Canadian Solar BiHiKu7 670W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026