LONGi vs Trina 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 Trina Solar (Mid-Range, 4.2/5).
LONGi (Mid-Range, 4.3/5) and Trina Solar (Mid-Range, 4.2/5) 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 22.5%).
- Lower price per watt: LONGi, from $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; LONGi on a tight budget.
How do LONGi and Trina 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 | Trina Solar |
|---|---|---|
| Tier | Mid-Range | Mid-Range |
| Overall rating | 4.3/5✓ | 4.2/5 |
| Max efficiencyHigher is better | 22.8%✓ | 22.5% |
| Max wattageHigher is better | 580 W | 670 W✓ |
| Price per wattLower is better | $0.42–$0.85✓ | $0.45–$0.95 |
| Product warrantyLonger is better | 15 yr | 15 yr |
| Temperature coefficientCloser to 0 is better | -0.26%/°C✓ | -0.29%/°C |
| Annual degradationLower is better | 0.35% | 0.35% |
| Country | China | China |
| Founded | 2000 | 1997 |
| Models available | 4 | 4 |
Which is more efficient, LONGi or Trina Solar?
LONGi is more efficient, converting up to 22.8% of sunlight into electricity versus 22.5% for Trina 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 Trina Solar?
LONGi is the lower-cost option, starting near $0.42 per watt before installation. LONGi ranges $0.42–$0.85/W and Trina Solar ranges $0.45–$0.95/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 LONGi or Trina 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: LONGi — better heat performance protects summer output.
- Longest protection: either brand — a 15-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
Trina Solar
Full review →Pros
- Vertex series delivers excellent power density
- Competitive pricing with strong manufacturing scale
- Decades of industry experience and proven reliability
- Wide product range for all market segments
Cons
- Standard product warranty shorter than some premium brands
- Residential brand recognition lower than SunPower or Panasonic in the US
- Some models primarily designed for commercial/utility scale
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Get Free Solar QuotesLONGi vs Trina Solar FAQ
LONGi is more efficient (up to 22.8% vs 22.5%), and LONGi costs less per watt (from $0.42/W). LONGi holds a 4.3/5 rating versus 4.2/5 for Trina 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 Trina Solar ranges $0.45–$0.95/W before installation.
LONGi reaches the higher efficiency at 22.8%, compared with 22.5% 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: LONGi degrades about 0.35% per year and Trina Solar about 0.35%.
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