Canadian Solar vs LONGi Solar Panels
A side-by-side 2026 comparison of efficiency, price per watt, warranty, and hot-weather performance for Canadian Solar (Mid-Range, 4.3/5) and LONGi (Mid-Range, 4.3/5).
Canadian Solar (Mid-Range, 4.3/5) and LONGi (Mid-Range, 4.3/5) are both proven residential solar panels. Canadian Solar is the more efficient panel, while LONGi costs less per watt.
- Most efficient: Canadian Solar, up to 23.3% (vs 22.8%).
- Lower price per watt: LONGi, from $0.42/W.
- Longer product warranty: Canadian Solar, 25 years.
- Better in hot climates: tie on temperature performance.
- Best for: Canadian Solar on small or shaded roofs; LONGi on a tight budget.
How do Canadian Solar and LONGi compare on specs?
The table below puts every key 2026 metric side by side and marks the winner on each row. Canadian Solar leads on efficiency; LONGi leads on price.
| Specification | Canadian Solar | LONGi |
|---|---|---|
| Tier | Mid-Range | Mid-Range |
| Overall rating | 4.3/5 | 4.3/5 |
| Max efficiencyHigher is better | 23.3%✓ | 22.8% |
| Max wattageHigher is better | 620 W✓ | 580 W |
| Price per wattLower is better | $0.45–$1.25 | $0.42–$0.85✓ |
| Product warrantyLonger is better | 25 yr✓ | 15 yr |
| Temperature coefficientCloser to 0 is better | -0.26%/°C | -0.26%/°C |
| Annual degradationLower is better | 0.25%✓ | 0.35% |
| Country | Canada | China |
| Founded | 2001 | 2000 |
| Models available | 5 | 4 |
Which is more efficient, Canadian Solar or LONGi?
Canadian Solar is more efficient, converting up to 23.3% of sunlight into electricity versus 22.8% for LONGi. Higher efficiency produces more watts per square foot, so it matters most on small or partially shaded roofs. On a large, unshaded roof the difference is minor — you can add a panel or two to match output.
Which is cheaper, Canadian Solar or LONGi?
LONGi is the lower-cost option, starting near $0.42 per watt before installation. Canadian Solar ranges $0.45–$1.25/W and LONGi ranges $0.42–$0.85/W. On a typical 6 kW system that price gap works out to a few hundred to a few thousand dollars before incentives like the 30% federal tax credit.
Which performs better in hot weather?
Both panels have similar temperature coefficients, so they lose output at about the same rate in heat. In hot-sun states like Arizona, Texas, and Florida, a better temperature coefficient can mean a few extra percent of summer production.
Which Canadian Solar or LONGi panel should you choose?
- Small or shaded roof: Canadian Solar — higher efficiency fits more power in less space.
- Tight budget / large roof: LONGi — lower price per watt wins when space isn't the constraint.
- Hot climate: either brand — better heat performance protects summer output.
- Longest protection: Canadian Solar — 25-year product warranty.
Canadian Solar
Full review →Pros
- Excellent value with competitive pricing
- Wide range of products for every application
- One of the largest and most bankable solar companies globally
- Strong track record of reliability and consistent quality
Cons
- Product warranty slightly shorter than premium brands on some models
- Efficiency lags behind top premium panels
- Most manufacturing occurs overseas despite Canadian headquarters
LONGi
Full review →Pros
- World leader in monocrystalline silicon technology
- Vertically integrated supply chain ensures quality control
- Hi-MO series offers excellent power output and efficiency
- Massive R&D investment drives continuous innovation
Cons
- Primarily focused on large-format commercial/utility modules
- US residential presence still growing compared to established brands
- Some geopolitical supply chain concerns
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Get Free Solar QuotesCanadian Solar vs LONGi FAQ
Canadian Solar is more efficient (up to 23.3% vs 22.8%), and LONGi costs less per watt (from $0.42/W). Canadian Solar holds a 4.3/5 rating versus 4.3/5 for LONGi. The better panel depends on whether you prioritize efficiency, price, or warranty.
LONGi is the lower-cost option, starting around $0.42 per watt. Canadian Solar ranges $0.45–$1.25/W and LONGi ranges $0.42–$0.85/W before installation.
Canadian Solar reaches the higher efficiency at 23.3%, compared with 22.8% for the other. Higher efficiency lets you fit more power on a smaller roof.
Canadian Solar offers the longer product warranty at 25 years. Lower annual degradation also matters: Canadian Solar degrades about 0.25% per year and LONGi about 0.35%.
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