Trina Solar Vertex S 420W vs Trina Solar Vertex N 580W Bifacial
The Trina Solar Vertex N 580W Bifacial wins this comparison by a decisive margin. It leads in efficiency (22.4% vs 21.3%) and matches or exceeds on warranty (15 vs 15 years). For most residential installations, the Trina Solar Vertex N 580W Bifacial is the stronger choice.
Key Differences
- • Trina Solar Vertex S 420W is rated at 420W while Trina Solar Vertex N 580W Bifacial is rated at 580W, a 160W difference.
- • Trina Solar Vertex N 580W Bifacial achieves 22.4% efficiency vs 21.3% for the other, a 1.1 percentage point gap.
- • Both carry matching 15-year product warranties.
- • Trina Solar Vertex N 580W Bifacial has a superior temperature coefficient of -0.29%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Trina Solar Vertex S 420W uses PERC Mono cells while Trina Solar Vertex N 580W Bifacial uses TOPCon N-type Bifacial cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Trina Solar Vertex N 580W Bifacial achieves 22.4% module efficiency compared to Trina Solar Vertex S 420W's 21.3%, meaning Trina Solar Vertex N 580W Bifacial converts 1.1 percentage points more sunlight into electricity per square meter. In practical terms, the Trina Solar Vertex S 420W produces 210.2 watts per square meter of panel area while the Trina Solar Vertex N 580W Bifacial produces 224.5 W/m². For rooftop installations where space is limited, this efficiency gap determines how many kilowatts you can fit on your available roof area. Over a 25-year system life, even a small efficiency advantage compounds into meaningful additional energy production.
Power Output
The Trina Solar Vertex N 580W Bifacial delivers 580W per panel versus 420W for the Trina Solar Vertex S 420W, a 160W difference per module. To build an 8 kW residential system, you would need 20 Trina Solar Vertex S 420W panels or 14 Trina Solar Vertex N 580W Bifacial panels. Choosing the higher-wattage option saves 6 panels, reducing total racking hardware, wiring, and installation labor costs. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Trina Solar Vertex N 580W Bifacial has a temperature coefficient of -0.29%/°C versus -0.34%/°C for the Trina Solar Vertex S 420W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Trina Solar Vertex N 580W Bifacial retains 94.2% of its rated power while the other retains 93.2%. This difference is particularly significant in hot climates such as the American Southwest, the Middle East, and Southeast Asia, where panels routinely operate 30-40°C above STC for several hours each day. Over the system lifetime, the cumulative energy advantage from a better temperature coefficient can amount to 2-4% of total production.
Warranty Coverage
The Trina Solar Vertex S 420W is backed by a 15-year product warranty and 25-year performance guarantee, while the Trina Solar Vertex N 580W Bifacial offers 15-year product and 30-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1.5% first year then 0.5%/year for Trina Solar Vertex S 420W; 1% first year then 0.4%/year for Trina Solar Vertex N 580W Bifacial), after 25 years the Trina Solar Vertex S 420W should retain approximately 86.5% of original output versus 89.4% for the Trina Solar Vertex N 580W Bifacial. This 2.9 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Trina Solar Vertex S 420W measures 1762×1134×30mm and weighs 21.8 kg, while the Trina Solar Vertex N 580W Bifacial measures 2278×1134×35mm at 29 kg. 2.00 m² of panel area for the Trina Solar Vertex S 420W versus 2.58 m² for the Trina Solar Vertex N 580W Bifacial. The Trina Solar Vertex S 420W is 7.2 kg lighter per panel, which reduces structural load requirements on the roof and makes handling easier during installation. For a 20-panel system, that is a total weight difference of 144 kg. The more compact Trina Solar Vertex S 420W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Trina Solar Vertex S 420W | Trina Solar Vertex N 580W Bifacial |
|---|---|---|
| Power | 420W | 580W |
| Efficiency | 21.3% | 22.4% |
| Power Density | 19.5 W/sq ft | 20.9 W/sq ft |
| Cell Type | PERC Mono | TOPCon N-type Bifacial |
| Bifacial | No | Yes |
| Weight | 21.8 kg | 29 kg |
| Temp Coefficient | -0.34%/°C | -0.29%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 15 years | 15 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.5% | 0.4% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Trina Solar Vertex N 580W BifacialThe Trina Solar Vertex N 580W Bifacial achieves 22.4% efficiency versus 21.3% — a 1.1 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 4.8 kW more total system capacity, or 22 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Trina Solar Vertex N 580W BifacialThe Trina Solar Vertex N 580W Bifacial has a better temperature coefficient of -0.29%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Trina Solar Vertex N 580W BifacialTrina Solar Vertex N 580W Bifacial degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 86.5% vs 89.4% of original output for Trina Solar Vertex S 420W and Trina Solar Vertex N 580W Bifacial respectively.
4. Power Output
Winner: Trina Solar Vertex N 580W BifacialThe Trina Solar Vertex N 580W Bifacial delivers 580W versus 420W per panel — 160W more. For an 8 kW system, you need 14 panels with the higher-wattage option versus 20 panels, saving 6 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Trina Solar Vertex N 580W BifacialThe Trina Solar Vertex S 420W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The Trina Solar Vertex N 580W Bifacial uses TOPCon N-type Bifacial: TOPCon (Tunnel Oxide Passivated Contact) adds a thin tunnel oxide layer to reduce recombination losses, achieving higher efficiency than PERC while being manufacturable on existing production lines. TOPCon N-type Bifacial represents a newer generation technology with a longer performance runway as manufacturing matures.
Trina Solar Vertex S 420W
The Vertex S (DE09R.08) is a proven PERC residential panel offering 420W with 144 half-cut cells in a compact form factor with reliable Trina Solar quality.
Pros
- + Proven PERC reliability
- + Competitive pricing
- + 144 half-cut cells for shade tolerance
- + Widely available
Cons
- - Lower efficiency than N-type
- - Higher degradation
- - PERC technology limitations
Trina Solar Vertex N 580W Bifacial
Trina Solar's Vertex N 580W Bifacial combines N-type TOPCon with bifacial design for maximum energy harvest in ground-mount systems.
Pros
- + Bifacial energy gain
- + N-type TOPCon technology
- + 580W output
- + Trina reliability
Cons
- - Requires elevated mounting
- - Large form factor
- - Heavy panel
Choose Trina Solar Vertex S 420W If...
- ✓ Cost-effective residential installations with proven technology.
Choose Trina Solar Vertex N 580W Bifacial If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You want maximum output retention over the system's 25-30 year lifespan
- ✓ You prefer newer cell technology with a longer performance improvement runway
Our Recommendation
The Trina Solar Vertex N 580W Bifacial is the decisive winner in this solar panel comparison, outperforming the Trina Solar Vertex S 420W in 5 of 5 dimensions. Unless you have a specific requirement that the Trina Solar Vertex S 420W uniquely addresses, the Trina Solar Vertex N 580W Bifacial is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Trina Solar Vertex S 420W or Trina Solar Vertex N 580W Bifacial?
The Trina Solar Vertex N 580W Bifacial wins this comparison by a decisive margin. It leads in efficiency (22.4% vs 21.3%) and matches or exceeds on warranty (15 vs 15 years). For most residential installations, the Trina Solar Vertex N 580W Bifacial is the stronger choice.
Which panel is more efficient, Trina Solar Vertex S 420W or Trina Solar Vertex N 580W Bifacial?
The Trina Solar Vertex N 580W Bifacial at 22.4% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.1 percentage points translates to approximately 160W per panel under standard test conditions.
Which has a better warranty, Trina Solar Vertex S 420W or Trina Solar Vertex N 580W Bifacial?
The Trina Solar Vertex S 420W comes with a 15-year product warranty and 25-year performance guarantee. The Trina Solar Vertex N 580W Bifacial offers 15-year product and 30-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Trina Solar Vertex S 420W has a temperature coefficient of -0.34%/°C and the Trina Solar Vertex N 580W Bifacial is -0.29%/°C. Trina Solar Vertex N 580W Bifacial retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Trina Solar Vertex S 420W vs Trina Solar Vertex N 580W Bifacial panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Trina Solar Vertex S 420W panels (420W each) or 14 Trina Solar Vertex N 580W Bifacial panels (580W each). The Trina Solar Vertex N 580W Bifacial requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026