LONGi vs Trina Solar Panels 2026: Which Brand Is Better?
LONGi and Trina Solar are the world's two largest solar panel manufacturers by shipment volume. This guide compares their flagship residential models using real specification data -- efficiency, warranty, temperature performance, and value.
Last updated: February 24, 2026 · 15 panels analyzed · No affiliate links
Brand Overview
LONGi Green Energy
Founded in 2000, LONGi is the world's largest solar panel manufacturer by annual shipments. The company is vertically integrated, producing its own monocrystalline silicon ingots, wafers, cells, and modules. LONGi has been the driving force behind multiple solar efficiency world records and pioneered the shift from polycrystalline to monocrystalline silicon that transformed the industry. Headquartered in Xi'an, China, with manufacturing in China and Southeast Asia.
Trina Solar
Founded in 1997, Trina Solar is the world's second-largest panel manufacturer and one of the oldest continuously operating solar companies. Trina has built its reputation on reliability, consistent quality, and competitive pricing. The company operates one of the solar industry's largest research centers and has contributed to over 25 world records in cell efficiency. Headquartered in Changzhou, China, with a global manufacturing footprint.
Technology: HPBC vs TOPCon
LONGi's flagship Hi-MO 7 series uses HPBC (Hybrid Passivated Back Contact) cell technology. This is a back-contact design where the electrical busbars and contacts are moved entirely to the rear of the cell, eliminating front-side shading losses from metal fingers. The result is a cleaner aesthetic and higher light absorption. HPBC is LONGi's proprietary technology and represents one of the most advanced commercial cell architectures available.
Trina Solar's Vertex N and Vertex S+ series use TOPCon (Tunnel Oxide Passivated Contact) N-type cells. TOPCon adds an ultra-thin tunnel oxide layer between the silicon wafer and a doped polysilicon contact, significantly reducing recombination losses at the cell surface. TOPCon is the most widely adopted next-generation cell technology in 2026, with multiple manufacturers scaling production. Trina is among the largest TOPCon producers globally.
Key insight: Both HPBC and TOPCon are N-type cell technologies that represent a generational leap over the older PERC technology that dominated the market through 2023. Both deliver higher efficiency, better temperature performance, and lower degradation rates than PERC. The choice between them is one of refinement, not generation.
Flagship Model Comparison
For the most direct comparison, we pair the LONGi Hi-MO 7 590W against the Trina Vertex N 590W -- both are premium 590W panels in the standard 144-cell residential format. We also compare the residential-optimized smaller format: LONGi Hi-MO X6 445W (TOPCon) against Trina Vertex S+ 445W.
| Specification | LONGi Hi-MO 7 590W | Trina Vertex N 590W |
|---|---|---|
| Wattage | 590W | 590W |
| Efficiency | 22.8% | 22.5% |
| Cell Technology | HPBC (Back Contact N-type) | TOPCon N-type |
| Cell Count | 144 | 144 |
| Temp Coefficient (Pmax) | -0.28%/°C | -0.29%/°C |
| Year-1 Degradation | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Product Warranty | 12 years | 15 years |
| Performance Warranty | 30 years | 30 years |
| Weight | 28.8 kg | 29 kg |
View full specs: LONGi Hi-MO 7 590W | Trina Vertex N 590W.
Efficiency
LONGi holds a slight efficiency edge across comparable products. The Hi-MO 7 620W reaches 23% -- the highest efficiency panel in LONGi's lineup. The Hi-MO 7 590W achieves 22.8%. Trina's comparable Vertex N+ 600W reaches 22.8%, and the Vertex N 590W achieves 22.5%.
The difference is small in absolute terms -- typically 0.3-0.5 percentage points. On a 20-panel system, this translates to roughly 50-100 watts of additional capacity, or about the equivalent of two to four extra watts per panel. In practice, this difference is unlikely to change system economics meaningfully, but for homeowners maximizing production from a constrained roof area, LONGi's HPBC technology provides a measurable advantage.
Warranty
Trina Solar offers a stronger product warranty on its premium lines. The Vertex S+ and Vertex N series carry 15-year product warranties, compared to LONGi's 12-year product warranty on the Hi-MO 7. The 3-year difference provides additional coverage against manufacturing defects, delamination, and physical failures.
Performance warranties are comparable. Both brands guarantee 30-30 year linear performance on their flagship lines, with similar degradation guarantees. LONGi's Hi-MO 7 620W stands out with an exceptionally low 0.5% first-year degradation and 0.35% annual degradation, slightly better than the typical 1% and 0.4% offered by Trina's TOPCon models.
Temperature Coefficient
Temperature coefficient measures how much a panel's output decreases as temperature rises above 25 degrees Celsius (the standard test condition). A lower absolute value is better, meaning less power loss in hot conditions. Both LONGi and Trina flagship models perform well here.
The LONGi Hi-MO 7 series achieves -0.28%/degree C, slightly better than the Trina Vertex N's -0.29%/degree C. In a hot climate where rooftop panel temperatures regularly reach 60-70 degrees Celsius, this means the Hi-MO 7 retains about 0.35% more relative power -- a small but real advantage. Both values represent significant improvement over older PERC panels, which typically had temperature coefficients of -0.34 to -0.37%/degree C.
For homeowners in hot climates (Arizona, Texas, Florida, California's Central Valley), the temperature coefficient is worth considering. Over 25 years, the cumulative energy production difference from a better temperature coefficient can add up to several hundred dollars in additional electricity generation.
FEOC Considerations
Both LONGi and Trina Solar are Chinese manufacturers, which has implications for U.S. solar installations under current trade policy. Panels from both brands are subject to anti-dumping and countervailing duties, though the exact tariff structure depends on the country of final assembly (China, Vietnam, Thailand, Malaysia, etc.).
For residential cash purchases, this is largely irrelevant -- you buy through a U.S. distributor at a market price that already includes any applicable duties. For TPO (third-party ownership) and lease structures, some financing entities prefer panels that qualify for additional domestic content bonuses under IRA provisions. Both LONGi and Trina panels are widely available and widely used in U.S. residential installations despite these considerations.
Price & Value
Both LONGi and Trina are competitively priced, typically ranging from $0.25 to $0.40 per watt at the module level. Trina Solar has historically been positioned slightly below LONGi in pricing, reflecting its scale-driven value proposition. The price difference between comparable models is usually $5-15 per panel, which adds up to $100-$300 for a typical 20-panel residential system.
LONGi's HPBC technology commands a slight premium over Trina's TOPCon due to the more complex manufacturing process and higher efficiency. However, when cost per watt is the metric, both brands land in a very similar range. The decision between them is more about technology preference, warranty terms, and installer availability than raw pricing.
All Models: LONGi vs Trina
LONGi Models
| Model | Wattage | Efficiency | Cell Type | Temp Coeff | Warranty | Details |
|---|---|---|---|---|---|---|
| Hi-MO 7 620W | 620W | 23% | HPBC (Back Contact N-type) | -0.28% | 12/30 yr | View → |
| Hi-MO 7 590W | 590W | 22.8% | HPBC (Back Contact N-type) | -0.28% | 12/30 yr | View → |
| Hi-MO 6 580W | 580W | 22.3% | PERC Mono Half-cut | -0.34% | 12/25 yr | View → |
| Hi-MO 6 Scientist 550W | 550W | 22% | PERC Mono | -0.34% | 12/25 yr | View → |
| Hi-MO X6 Max 470W | 470W | 22.3% | TOPCon N-type | -0.29% | 15/30 yr | View → |
| Hi-MO X6 445W | 445W | 22% | TOPCon N-type | -0.29% | 12/25 yr | View → |
| Hi-MO 6 Artist 440W | 440W | 22% | PERC Mono | -0.34% | 12/25 yr | View → |
| Hi-MO 6 Explorer 430W | 430W | 21.6% | PERC Mono | -0.34% | 12/25 yr | View → |
Trina Solar Models
| Model | Wattage | Efficiency | Cell Type | Temp Coeff | Warranty | Details |
|---|---|---|---|---|---|---|
| Vertex N+ 600W | 600W | 22.8% | TOPCon N-type | -0.28% | 15/30 yr | View → |
| Vertex N 590W | 590W | 22.5% | TOPCon N-type | -0.29% | 15/30 yr | View → |
| Vertex N 580W Bifacial | 580W | 22.4% | TOPCon N-type Bifacial | -0.29% | 15/30 yr | View → |
| Vertex S+ NEG9RC 450W | 450W | 22.5% | TOPCon N-type | -0.29% | 15/30 yr | View → |
| Vertex S+ 445W | 445W | 22.3% | TOPCon N-type | -0.29% | 15/30 yr | View → |
| DE09R 430W | 430W | 21% | PERC Mono | -0.34% | 12/25 yr | View → |
| Vertex S 420W | 420W | 21.3% | PERC Mono | -0.34% | 15/25 yr | View → |
Our Recommendation
This is a very close comparison between two excellent manufacturers. Both produce reliable, high-efficiency panels backed by substantial companies with long track records. Here is how to choose:
Choose LONGi If:
- Maximum efficiency is your priority (23% peak)
- You want HPBC back-contact technology (cleaner aesthetics)
- You live in a hot climate (better temperature coefficient: -0.28%/degree C)
- Lower long-term degradation matters (0.35% annual on Hi-MO 7 620W)
- You have limited roof space and need maximum watts per square meter
Choose Trina Solar If:
- Value and competitive pricing are top priorities
- You want a longer product warranty (15 years vs 12)
- Your installer recommends or has better pricing on Trina
- You want the residential-optimized Vertex S+ form factor
- Proven TOPCon technology with massive production scale
Frequently Asked Questions
Is LONGi or Trina Solar better for residential solar?
Both are excellent choices for residential installations. LONGi's Hi-MO 7 series offers slightly higher peak efficiency (23% for the 620W model) using their proprietary HPBC back-contact technology. Trina's Vertex S+ is specifically designed for residential roofs with a compact 108-cell format and strong 22.3% efficiency. For maximum efficiency, choose LONGi. For a proven residential-optimized design at competitive pricing, choose Trina.
Are LONGi and Trina panels made in China?
Yes. Both LONGi and Trina Solar manufacture their panels primarily in China, though both have expanded manufacturing to Southeast Asia and other regions. For U.S. installations, this means these panels may face tariff considerations and are generally not eligible for domestic content bonuses. However, both brands are widely available through U.S. distributors and are used in hundreds of thousands of residential installations nationwide.
Which brand has a better warranty?
Trina Solar offers a longer product warranty: 15 years for the Vertex S+ series compared to LONGi's 12 years for the Hi-MO 7. Both brands offer 30-30 year performance warranties on their premium lines. Both guarantee similar degradation rates: 1% first-year and 0.4% annual for flagship models.
What technology do LONGi and Trina panels use?
LONGi's flagship Hi-MO 7 series uses HPBC (Hybrid Passivated Back Contact) N-type cell technology, which moves electrical contacts to the back of the cell for maximum light absorption. Trina Solar's Vertex N and Vertex S+ series use TOPCon (Tunnel Oxide Passivated Contact) N-type technology, which adds a thin tunnel oxide layer for improved electron collection. Both are next-generation technologies that outperform older PERC cells.
Related Resources
Last updated: February 24, 2026. Data sourced from manufacturer datasheets. Verify specifications with your installer before purchase.