LONGi vs Silfab Solar Solar Panels
A side-by-side 2026 comparison of efficiency, price per watt, warranty, and hot-weather performance for LONGi (Mid-Range, 4.3/5) and Silfab Solar (Mid-Range, 4.3/5).
LONGi (Mid-Range, 4.3/5) and Silfab Solar (Mid-Range, 4.3/5) are both proven residential solar panels. LONGi is the more efficient panel, while LONGi costs less per watt.
- Most efficient: LONGi, up to 22.8% (vs 22%).
- Lower price per watt: LONGi, from $0.42/W.
- Longer product warranty: Silfab Solar, 25 years.
- Better in hot climates: tie on temperature performance.
- Best for: LONGi on small or shaded roofs; LONGi on a tight budget.
How do LONGi and Silfab Solar compare on specs?
The table below puts every key 2026 metric side by side and marks the winner on each row. LONGi leads on efficiency; LONGi leads on price.
| Specification | LONGi | Silfab Solar |
|---|---|---|
| Tier | Mid-Range | Mid-Range |
| Overall rating | 4.3/5 | 4.3/5 |
| Max efficiencyHigher is better | 22.8%✓ | 22% |
| Max wattageHigher is better | 580 W✓ | 440 W |
| Price per wattLower is better | $0.42–$0.85✓ | $0.70–$1.35 |
| Product warrantyLonger is better | 15 yr | 25 yr✓ |
| Temperature coefficientCloser to 0 is better | -0.26%/°C | -0.26%/°C |
| Annual degradationLower is better | 0.35% | 0.25%✓ |
| Country | China | United States/Canada |
| Founded | 2000 | 2010 |
| Models available | 4 | 4 |
Which is more efficient, LONGi or Silfab Solar?
LONGi is more efficient, converting up to 22.8% 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, LONGi or Silfab Solar?
LONGi is the lower-cost option, starting near $0.42 per watt before installation. LONGi ranges $0.42–$0.85/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 LONGi or Silfab Solar panel should you choose?
- Small or shaded roof: LONGi — 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: Silfab Solar — 25-year product warranty.
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
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
Get quotes for LONGi and Silfab Solar
Compare real installed prices from vetted local installers — free and no obligation.
Get Free Solar QuotesLONGi vs Silfab Solar FAQ
LONGi is more efficient (up to 22.8% vs 22%), and LONGi costs less per watt (from $0.42/W). LONGi holds a 4.3/5 rating versus 4.3/5 for Silfab Solar. The better panel depends on whether you prioritize efficiency, price, or warranty.
LONGi is the lower-cost option, starting around $0.42 per watt. LONGi ranges $0.42–$0.85/W and Silfab Solar ranges $0.70–$1.35/W before installation.
LONGi reaches the higher efficiency at 22.8%, compared with 22% for the other. Higher efficiency lets you fit more power on a smaller roof.
Silfab Solar offers the longer product warranty at 25 years. Lower annual degradation also matters: LONGi degrades about 0.35% per year and Silfab Solar about 0.25%.
Start saving with solar today.
Join thousands of homeowners who've switched to clean energy and locked in decades of lower bills.