Trina Solar Vertex S 420W Specifications & Review
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.
What Makes the Trina Solar Vertex S 420W Different
The Trina Solar Vertex S 420W delivers 420W using Trina Solar's established PERC monocrystalline platform with 144 half-cut cells for improved shade tolerance. Trina Solar is one of the world's largest panel manufacturers with over 150 GW shipped globally, making the Vertex S one of the most widely installed residential panels in history. At 21.3% efficiency, the DE09R series provides reliable performance at a highly competitive price point. The 1762×1134mm format at 21.8 kg fits standard residential racking, and Trina's 15-year product warranty reflects confidence in their proven PERC technology. While the -0.34%/°C temperature coefficient is typical for PERC panels, the price advantage often more than compensates for the slightly lower hot-weather performance versus N-type alternatives.
Key Specifications
| Brand | Trina Solar |
| Model | Trina Solar Vertex S 420W |
| Power Output | 420W |
| Efficiency | 21.3% |
| Power Density | 19.5 W/sq ft |
| Cell Type | PERC Mono |
| Cell Count | 144 cells |
| Dimensions | 1762 x 1134 x 30 mm |
| Weight | 21.8 kg |
| Open Circuit Voltage (Voc) | 40.5V |
| Max Power Voltage (Vmp) | 33.8V |
| Short Circuit Current (Isc) | 13.42A |
| Max Power Current (Imp) | 12.43A |
| Temp Coefficient (Pmax) | -0.34%/°C |
| Product Warranty | 15 years |
| Performance Warranty | 25 years |
| First Year Degradation | 1.5% |
| Annual Degradation | 0.5% |
| Country of Manufacture | China |
| Certifications | IEC 61215, IEC 61730, UL 1703 |
| Snow Load | 5400 Pa (112.8 psf) — Heavy Snow Rated |
| Wind Load | 2400 Pa (50.1 psf) |
Pros & Cons
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
Best For
Cost-effective residential installations with proven technology.
Is the Trina Solar Vertex S 420W Worth It?
The Trina Solar Vertex S 420W delivers 420W of power at 21.3% module efficiency, which is above the current industry average of approximately 21%. This higher efficiency means you need fewer panels to reach your target system size, saving roof space and potentially reducing mounting hardware costs.
From a warranty perspective, the Vertex S 420W comes with a solid 15-year product warranty and a 25-year performance guarantee. The industry standard for product warranties ranges from 12 to 25 years, so this panel offers solid coverage that meets or exceeds the industry midpoint. At the end of 25 years, the panel is guaranteed to still produce approximately 86.5% of its rated output, with first-year degradation of 1.5% and just 0.5% per year after that.
Pricing varies by region and installer, but the Vertex S 420W's combination of 21.3% efficiency and 15-year warranty should be weighed against per-watt quotes from your installer. Request at least three quotes to ensure you are getting competitive pricing for this tier of panel.
For hot climates, the temperature coefficient of -0.34%/°C is good. This falls within the typical range, so you can expect reasonable performance in most climates, though premium panels with coefficients closer to -0.25%/°C will edge ahead in extreme heat. Overall, the Trina Solar Vertex S 420W represents a strong value proposition for most residential installations.
Real-World Performance
In real-world conditions, the Trina Solar Vertex S 420W delivers consistent energy production shaped by its -0.34%/°C temperature coefficient. On a hot summer day when panel surface temperatures reach 65°C (40°C above STC), the Vertex S 420W loses approximately 13.6% of rated output — typical for PERC technology. Over a full year in a typical US location, expect annual specific yield of 1,400-1,700 kWh per kW installed, depending on location, tilt, and shading. The 1.5% first-year degradation settles into 0.5% annual degradation thereafter; after 25 years the Vertex S 420W should still produce approximately 86.5% of its original rating. The 144 half-cut cells provide improved shade tolerance compared to full-cell designs — when one cell is shaded, only one sub-string is affected rather than an entire string, limiting production losses to approximately one-third of the panel rather than one-half.
Who Should Buy the Trina Solar Vertex S 420W?
System Design Tips
For string inverter systems, the Trina Solar Vertex S 420W's Voc of 40.5V allows up to 14 panels per string on a 600V inverter, or 11 panels per string on 480V systems. The Isc of 13.42A is within the input range of all major residential string inverters and microinverters. For microinverter pairing, the Enphase IQ8A (366VA) or IQ8H (384VA) handles the 420W output well with a DC/AC ratio of 1.1-1.1. SolarEdge P505 optimizers pair well for optimizer-based systems. Size your inverter at 75-90% of total DC wattage for optimal clipping management — for a 24-panel array (10.1 kW DC), a 8 W AC inverter is a good match. The panel handles 5400 Pa snow load and 2400 Pa wind load.
Price Estimate
The Trina Solar Vertex S 420W is sold through residential solar distributors and installers. Trina Solar pricing varies by distributor and order volume. For a 24-panel system (10.1 kW DC), total installed cost including panels, inverter, racking, wiring, permitting, and labor typically runs $2.50-3.50/W, or approximately $30,240-$35,280 before the 30% federal ITC. After ITC: approximately $21,168-$24,696.
How the Trina Solar Vertex S 420W Compares
| Model | Wattage | Efficiency | W/sq ft | Warranty | Snow Load | Cell Type |
|---|---|---|---|---|---|---|
| Trina Solar Vertex S 420W (this panel) | 420W | 21.3% | 19.5 | 15 yrs | 5400 Pa | PERC Mono |
| Canadian Solar CS6R 420W | 420W | 21% | 20.0 | 12 yrs | 5400 Pa | PERC Mono |
| REC TwinPeak 5 420W | 420W | 21.4% | 20.0 | 20 yrs | 5400 Pa | PERC Mono |
| Q CELLS Q.TRON BLK M-G11+ 420W | 420W | 21.6% | 20.0 | 25 yrs | 5400 Pa | TOPCon N-type |
Compare This Panel
Installation & Compatibility
System Voltage & String Sizing
- Open Circuit Voltage (Voc)
- 40.5V
- Max Power Voltage (Vmp)
- 33.8V
- Short Circuit Current (Isc)
- 13.42A
- Max Power Current (Imp)
- 12.43A
- Max Panels per String (600V)
- 14 panels
Based on NEC 600V residential limit. Actual string sizing should account for cold-temperature Voc rise. Consult your installer or use a string sizing tool for your specific location.
Mounting Requirements
- Dimensions
- 1762 x 1134 x 30 mm
- Weight
- 21.8 kg (48.1 lbs)
- Area per Panel
- 21.5 sq ft
- Weight per sq ft
- 2.2 lbs/sq ft
Recommended Inverter Types
- - Microinverters: Ideal for shaded roofs or complex layouts. Match to panels rated 420W+.
- - String Inverters: Cost-effective for unshaded arrays. Ensure MPPT range covers 33.8V.
- - Hybrid Inverters: Best if adding battery storage. Check DC input specs match panel Voc of 40.5V.
Frequently Asked Questions
How efficient is the Trina Solar Vertex S 420W compared to other panels?
The Vertex S 420W achieves 21.3% module efficiency, which is competitive for PERC residential panels. PERC panels typically range from 20.0% to 21.8%, and the Vertex S 420W performs competitively within that range. Higher efficiency means more watts per square foot of roof space.
What is the warranty on the Trina Solar Vertex S 420W?
Trina Solar provides a 15-year product warranty covering manufacturing defects and a 25-year performance warranty guaranteeing output levels. The performance warranty typically starts at 98.5% after year 1 and degrades by 0.5% per year, guaranteeing approximately 86.5% output at year 25. The product warranty is in line with industry standards.
How many Trina Solar Vertex S 420W panels do I need for my home?
For a typical US home using 10,000 kWh per year, you need approximately 24 panels (10.1 kW system) assuming 4-5 peak sun hours per day. This varies significantly by location — homes in Arizona may need 21-23 panels while homes in the Pacific Northwest may need 26-28 panels. Your installer will calculate the exact number based on your utility bills, roof orientation, shading, and local solar resource.
What is the efficiency of the Trina Solar Vertex S 420W?
The Trina Solar Vertex S 420W achieves 21.3% module efficiency using PERC Mono cell technology. This is around the industry average for residential solar panels in 2026.
What warranty does the Trina Solar Vertex S 420W include?
It comes with a 15-year product warranty and a 25-year performance warranty guaranteeing output at approximately 86.5% of rated power at the end of the warranty period.
How does the Trina Solar Vertex S 420W perform in hot weather?
With a temperature coefficient of -0.34%/°C, the Vertex S 420W experiences moderate power reduction in high temperatures. Every degree above 25°C reduces output by 0.34%.
What size system can I build with the Trina Solar Vertex S 420W?
At 420W per panel, you would need approximately 20 panels for an 8 kW system or 24 panels for a 10 kW system. Each panel measures 1762 x 1134 mm (21.5 sq ft).
What inverter is best with the Trina Solar Vertex S 420W?
The Trina Solar Vertex S 420W works well with both string inverters and microinverters. For string inverters, choose one with a maximum input voltage above 40.5V and an MPPT voltage range that covers 33.8V. Microinverters rated for 420W+ panels are also an excellent choice, offering panel-level monitoring and shade tolerance. Popular options include Enphase IQ8 series microinverters and SolarEdge string inverters with power optimizers.
How long will the Trina Solar Vertex S 420W last?
The Trina Solar Vertex S 420W is built to last well beyond its 25-year performance warranty. With first-year degradation of 1.5% and annual degradation of 0.5% thereafter, the panel will still produce approximately 86.5% of its rated power after 25 years. Most modern solar panels continue generating useful power for 30-40 years, though output gradually decreases over time.
Is the Trina Solar Vertex S 420W good for Arizona and other sunny states?
The Trina Solar Vertex S 420W can work in hot states like Arizona, Nevada, and Texas, though its temperature coefficient of -0.34%/°C means it will lose some output on the hottest days. Consider panels with a lower (closer to 0) temperature coefficient if you live in an area with extreme heat. Higher sun exposure in these states means more total energy production throughout the year, often offsetting any heat-related losses.
Is the Trina Solar Vertex S 420W worth the money?
The Trina Solar Vertex S 420W delivers 21.3% efficiency, which is above the industry average of ~21%. Combined with a solid 15-year product warranty and 25-year performance guarantee, it offers strong value for homeowners seeking reliable solar generation.
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Last updated: February 2026