Trina Solar Vertex S+ 445W vs Trina Solar Vertex N 580W Bifacial
The Trina Solar Vertex N 580W Bifacial wins this comparison by a clear margin. It leads in efficiency (22.4% vs 22.3%) 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+ 445W is rated at 445W while Trina Solar Vertex N 580W Bifacial is rated at 580W, a 135W difference.
- • Trina Solar Vertex N 580W Bifacial achieves 22.4% efficiency vs 22.3% for the other, a 0.1 percentage point gap.
- • Both carry matching 15-year product warranties.
- • Trina Solar Vertex S+ 445W uses TOPCon N-type 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+ 445W's 22.3%, meaning Trina Solar Vertex N 580W Bifacial converts 0.1 percentage points more sunlight into electricity per square meter. In practical terms, the Trina Solar Vertex S+ 445W produces 227.9 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 445W for the Trina Solar Vertex S+ 445W, a 135W difference per module. To build an 8 kW residential system, you would need 18 Trina Solar Vertex S+ 445W panels or 14 Trina Solar Vertex N 580W Bifacial panels. Choosing the higher-wattage option saves 4 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
Both panels share an identical temperature coefficient of -0.29%/°C, meaning they lose power at the same rate as cell temperature rises above the 25°C standard test baseline. At 65°C cell temperature, both retain 94.2% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Trina Solar Vertex S+ 445W is backed by a 15-year product warranty and 30-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% first year then 0.4%/year for Trina Solar Vertex S+ 445W; 1% first year then 0.4%/year for Trina Solar Vertex N 580W Bifacial), after 25 years the Trina Solar Vertex S+ 445W should retain approximately 89.4% of original output versus 89.4% for the Trina Solar Vertex N 580W Bifacial. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Trina Solar Vertex S+ 445W measures 1722×1134×30mm and weighs 21.3 kg, while the Trina Solar Vertex N 580W Bifacial measures 2278×1134×35mm at 29 kg. 1.95 m² of panel area for the Trina Solar Vertex S+ 445W versus 2.58 m² for the Trina Solar Vertex N 580W Bifacial. The Trina Solar Vertex S+ 445W is 7.7 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 154 kg. The more compact Trina Solar Vertex S+ 445W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Trina Solar Vertex S+ 445W | Trina Solar Vertex N 580W Bifacial |
|---|---|---|
| Power | 445W | 580W |
| Efficiency | 22.3% | 22.4% |
| Power Density | 21.2 W/sq ft | 20.9 W/sq ft |
| Cell Type | TOPCon N-type | TOPCon N-type Bifacial |
| Bifacial | Yes | Yes |
| Weight | 21.3 kg | 29 kg |
| Temp Coefficient | -0.29%/°C | -0.29%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 15 years | 15 years |
| Performance Warranty | 30 years | 30 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 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 22.3% — a 0.1 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 4.0 kW more total system capacity, or 19 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: TieBoth panels share a temperature coefficient of -0.29%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: TieBoth panels offer identical 15-year product warranties and 0.4% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Trina Solar Vertex N 580W BifacialThe Trina Solar Vertex N 580W Bifacial delivers 580W versus 445W per panel — 135W more. For an 8 kW system, you need 14 panels with the higher-wattage option versus 18 panels, saving 4 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe Trina Solar Vertex S+ 445W uses TOPCon N-type: 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. 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. Both are equivalent-generation technologies.
Trina Solar Vertex S+ 445W
The Trina Vertex S+ delivers 445W using N-type TOPCon technology in a compact residential format with excellent all-round performance.
Pros
- + Compact residential size
- + Strong N-type efficiency
- + Good shade tolerance
- + 30-year performance warranty
Cons
- - Moderate weight
- - Not the highest wattage option
- - Limited color options
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+ 445W If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Residential rooftops with moderate space requiring high efficiency.
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 prefer newer cell technology with a longer performance improvement runway
- ✓ Ground-mount and tracking systems seeking maximum energy production with bifacial gain.
Our Recommendation
We recommend the Trina Solar Vertex N 580W Bifacial for most buyers in this comparison. It wins 2 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Trina Solar Vertex S+ 445W remains a good product, but the Trina Solar Vertex N 580W Bifacial delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Trina Solar Vertex S+ 445W or Trina Solar Vertex N 580W Bifacial?
The Trina Solar Vertex N 580W Bifacial wins this comparison by a clear margin. It leads in efficiency (22.4% vs 22.3%) 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+ 445W 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 0.1 percentage points translates to approximately 135W per panel under standard test conditions.
Which has a better warranty, Trina Solar Vertex S+ 445W or Trina Solar Vertex N 580W Bifacial?
The Trina Solar Vertex S+ 445W comes with a 15-year product warranty and 30-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+ 445W has a temperature coefficient of -0.29%/°C and the Trina Solar Vertex N 580W Bifacial is -0.29%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Trina Solar Vertex S+ 445W vs Trina Solar Vertex N 580W Bifacial panels do I need for an 8 kW system?
For an 8 kW system: you need 18 Trina Solar Vertex S+ 445W panels (445W 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