Panasonic vs Silfab Solar 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 Silfab Solar (Mid-Range, 4.3/5).
Panasonic (Premium, 4.5/5) and Silfab Solar (Mid-Range, 4.3/5) are both proven residential solar panels. Panasonic is the more efficient panel, while Silfab Solar costs less per watt.
- Most efficient: Panasonic, up to 22.2% (vs 22%).
- Lower price per watt: Silfab Solar, from $0.70/W.
- Longer product warranty: tie at 25 years.
- Better in hot climates: tie on temperature performance.
- Best for: Panasonic on small or shaded roofs; Silfab Solar on a tight budget.
How do Panasonic and Silfab Solar compare on specs?
The table below puts every key 2026 metric side by side and marks the winner on each row. Panasonic leads on efficiency; Silfab Solar leads on price.
| Specification | Panasonic | Silfab Solar |
|---|---|---|
| Tier | Premium | Mid-Range |
| Overall rating | 4.5/5✓ | 4.3/5 |
| Max efficiencyHigher is better | 22.2%✓ | 22% |
| Max wattageHigher is better | 410 W | 440 W✓ |
| Price per wattLower is better | $0.95–$1.55 | $0.70–$1.35✓ |
| Product warrantyLonger is better | 25 yr | 25 yr |
| Temperature coefficientCloser to 0 is better | -0.26%/°C | -0.26%/°C |
| Annual degradationLower is better | 0.25% | 0.25% |
| Country | Japan | United States/Canada |
| Founded | 1918 | 2010 |
| Models available | 3 | 4 |
Which is more efficient, Panasonic or Silfab Solar?
Panasonic is more efficient, converting up to 22.2% of sunlight into electricity versus 22% for Silfab Solar. 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 Silfab Solar?
Silfab Solar is the lower-cost option, starting near $0.70 per watt before installation. Panasonic ranges $0.95–$1.55/W and Silfab Solar ranges $0.70–$1.35/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 Panasonic or Silfab Solar panel should you choose?
- Small or shaded roof: Panasonic — higher efficiency fits more power in less space.
- Tight budget / large roof: Silfab Solar — lower price per watt wins when space isn't the constraint.
- Hot climate: either brand — 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
Silfab Solar
Full review →Pros
- Made in North America (US and Canada factories)
- High-quality automated manufacturing processes
- Strong product warranty and customer support
- Qualifies for domestic content bonus under IRA
Cons
- Smaller scale than major global manufacturers
- Product lineup is less extensive than larger brands
- Pricing slightly above imported alternatives
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Get Free Solar QuotesPanasonic vs Silfab Solar FAQ
Panasonic is more efficient (up to 22.2% vs 22%), and Silfab Solar costs less per watt (from $0.70/W). Panasonic holds a 4.5/5 rating versus 4.3/5 for Silfab Solar. The better panel depends on whether you prioritize efficiency, price, or warranty.
Silfab Solar is the lower-cost option, starting around $0.70 per watt. Panasonic ranges $0.95–$1.55/W and Silfab Solar ranges $0.70–$1.35/W before installation.
Panasonic reaches the higher efficiency at 22.2%, compared with 22% 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 Silfab Solar about 0.25%.
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