JA Solar vs LONGi Solar Panels
A side-by-side 2026 comparison of efficiency, price per watt, warranty, and hot-weather performance for JA Solar (Mid-Range, 4.2/5) and LONGi (Mid-Range, 4.3/5).
JA Solar (Mid-Range, 4.2/5) and LONGi (Mid-Range, 4.3/5) are both proven residential solar panels. LONGi is the more efficient panel, while pricing is nearly identical.
- Most efficient: LONGi, up to 22.8% (vs 22.4%).
- Lower price per watt: tie at $0.42/W.
- Longer product warranty: tie at 15 years.
- Better in hot climates: LONGi, lower temperature loss.
- Best for: LONGi on small or shaded roofs; either on budget.
How do JA Solar and LONGi 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; price is tied.
| Specification | JA Solar | LONGi |
|---|---|---|
| Tier | Mid-Range | Mid-Range |
| Overall rating | 4.2/5 | 4.3/5✓ |
| Max efficiencyHigher is better | 22.4% | 22.8%✓ |
| Max wattageHigher is better | 580 W | 580 W |
| Price per wattLower is better | $0.42–$0.85 | $0.42–$0.85 |
| Product warrantyLonger is better | 15 yr | 15 yr |
| Temperature coefficientCloser to 0 is better | -0.29%/°C | -0.26%/°C✓ |
| Annual degradationLower is better | 0.35% | 0.35% |
| Country | China | China |
| Founded | 2005 | 2000 |
| Models available | 4 | 4 |
Which is more efficient, JA Solar or LONGi?
LONGi is more efficient, converting up to 22.8% of sunlight into electricity versus 22.4% for JA 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, JA Solar or LONGi?
Both brands start near $0.42 per watt before installation. JA Solar ranges $0.42–$0.85/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?
LONGi 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 JA Solar or LONGi panel should you choose?
- Small or shaded roof: LONGi — 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: LONGi — better heat performance protects summer output.
- Longest protection: either brand — a 15-year product warranty.
JA Solar
Full review →Pros
- Top-five global manufacturer with excellent bankability
- DeepBlue series offers strong performance at competitive prices
- Extensive global track record with large installed base
- Good balance of price and quality for mid-range segment
Cons
- Brand awareness lower than SunPower or Q Cells in US residential market
- Product warranty shorter than premium competitors on some models
- Customer support in the US could be more accessible
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
Get quotes for JA Solar and LONGi
Compare real installed prices from vetted local installers — free and no obligation.
Get Free Solar QuotesJA Solar vs LONGi FAQ
LONGi is more efficient (up to 22.8% vs 22.4%), and both start near $0.42/W. JA Solar holds a 4.2/5 rating versus 4.3/5 for LONGi. The better panel depends on whether you prioritize efficiency, price, or warranty.
Both brands start at about $0.42 per watt. JA Solar ranges $0.42–$0.85/W and LONGi ranges $0.42–$0.85/W before installation.
LONGi reaches the higher efficiency at 22.8%, compared with 22.4% for the other. Higher efficiency lets you fit more power on a smaller roof.
Both offer a 15-year product warranty. Lower annual degradation also matters: JA Solar degrades about 0.35% per year and LONGi about 0.35%.
Start saving with solar today.
Join thousands of homeowners who've switched to clean energy and locked in decades of lower bills.