Canadian Solar vs SunPower Solar Panels
Head-to-head comparison for UK homes in 2026.
| Spec | Canadian Solar | SunPower |
|---|---|---|
| Country | Canada | United States |
| Tier | mid-range | premium |
| Efficiency | 22% | 22.8% |
| Product Warranty | 12 years | 40 years |
| Performance Warranty | 25 years | 40 years |
| Degradation Rate | 0.4%/yr | 0.25%/yr |
| Price per kW (GBP, installed) | £1,400-£1,675 | £1,700-£2,100 |
| Panel Wattage | 445W | 440W |
| Cell Type | N-type TOPCon Monocrystalline | IBC Monocrystalline |
| Best For | Homeowners wanting a non-Chinese headquartered Tier-1 brand at a competitive price | Homeowners wanting the absolute best panels with the longest warranty, especially on limited roof space |
Canadian Solar
Pros
- + Canadian HQ with global presence
- + Tier-1 bankability
- + Consistent manufacturing quality
- + Strong commercial track record
- + Competitive pricing
Cons
- - 12-year product warranty (shorter than LONGi/Trina)
- - Panels manufactured in China despite Canadian branding
- - Less brand recognition in the UK residential market
SunPower
Pros
- + Highest efficiency panels available
- + Industry-best 40-year warranty
- + Lowest degradation rate (0.25%/yr)
- + All-black aesthetics
- + US-engineered technology
Cons
- - Most expensive option
- - Limited installer availability in the UK
- - Fewer system size options
- - Premium may not be justified for all roofs