Panasonic vs SunPower Solar Panels
A side-by-side 2026 comparison of efficiency, price per watt, warranty, and hot-weather performance for Panasonic (Premium, 4.5/5) and SunPower (Premium, 4.7/5).
Panasonic (Premium, 4.5/5) and SunPower (Premium, 4.7/5) are both proven residential solar panels. SunPower is the more efficient panel, while pricing is nearly identical.
- Most efficient: SunPower, up to 24.1% (vs 22.2%).
- Lower price per watt: tie at $0.95/W.
- Longer product warranty: tie at 25 years.
- Better in hot climates: Panasonic, lower temperature loss.
- Best for: SunPower on small or shaded roofs; either on budget.
How do Panasonic and SunPower compare on specs?
The table below puts every key 2026 metric side by side and marks the winner on each row. SunPower leads on efficiency; price is tied.
| Specification | Panasonic | SunPower |
|---|---|---|
| Tier | Premium | Premium |
| Overall rating | 4.5/5 | 4.7/5✓ |
| Max efficiencyHigher is better | 22.2% | 24.1%✓ |
| Max wattageHigher is better | 410 W | 440 W✓ |
| Price per wattLower is better | $0.95–$1.55 | $0.95–$1.70 |
| Product warrantyLonger is better | 25 yr | 25 yr |
| Temperature coefficientCloser to 0 is better | -0.26%/°C✓ | -0.27%/°C |
| Annual degradationLower is better | 0.25% | 0.25% |
| Country | Japan | United States |
| Founded | 1918 | 1985 |
| Models available | 3 | 4 |
Which is more efficient, Panasonic or SunPower?
SunPower is more efficient, converting up to 24.1% of sunlight into electricity versus 22.2% for Panasonic. 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, Panasonic or SunPower?
Both brands start near $0.95 per watt before installation. Panasonic ranges $0.95–$1.55/W and SunPower ranges $0.95–$1.70/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?
Panasonic performs better in heat, with a temperature coefficient closer to zero — it loses less output as panel temperature climbs. In hot-sun states like Arizona, Texas, and Florida, a better temperature coefficient can mean a few extra percent of summer production.
Which Panasonic or SunPower panel should you choose?
- Small or shaded roof: SunPower — higher efficiency fits more power in less space.
- Tight budget / large roof: either brand — lower price per watt wins when space isn't the constraint.
- Hot climate: Panasonic — better heat performance protects summer output.
- Longest protection: either brand — a 25-year product warranty.
Panasonic
Full review →Pros
- Exceptional temperature coefficient for hot climates
- HJT cell technology delivers superior real-world performance
- Trusted global brand with decades of manufacturing experience
- Strong warranty coverage and reliability track record
Cons
- Premium pricing compared to many Chinese manufacturers
- Smaller product lineup than some competitors
- Panel availability can fluctuate in certain markets
SunPower
Full review →Pros
- Industry-leading panel efficiency up to 22.8%
- Comprehensive 25-year product and performance warranty
- Sleek all-black aesthetic design
- Strong brand reputation and dealer network
Cons
- Premium pricing significantly above market average
- Limited availability outside authorized dealer network
- Manufacturing now handled by Maxeon (separate company)
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Get Free Solar QuotesPanasonic vs SunPower FAQ
SunPower is more efficient (up to 24.1% vs 22.2%), and both start near $0.95/W. Panasonic holds a 4.5/5 rating versus 4.7/5 for SunPower. The better panel depends on whether you prioritize efficiency, price, or warranty.
Both brands start at about $0.95 per watt. Panasonic ranges $0.95–$1.55/W and SunPower ranges $0.95–$1.70/W before installation.
SunPower reaches the higher efficiency at 24.1%, compared with 22.2% for the other. Higher efficiency lets you fit more power on a smaller roof.
Both offer a 25-year product warranty. Lower annual degradation also matters: Panasonic degrades about 0.25% per year and SunPower about 0.25%.
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