Silfab SIL-500-NX 500W vs Astronergy ASTRO N5 460W
The Silfab SIL-500-NX 500W wins this comparison by a decisive margin. It leads in efficiency (21.8% vs 21.3%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Silfab SIL-500-NX 500W is the stronger choice.
Key Differences
- • Silfab SIL-500-NX 500W is rated at 500W while Astronergy ASTRO N5 460W is rated at 460W, a 40W difference.
- • Silfab SIL-500-NX 500W achieves 21.8% efficiency vs 21.3% for the other, a 0.5 percentage point gap.
- • Silfab SIL-500-NX 500W comes with a 25-year product warranty vs 12 years for the other.
- • Silfab SIL-500-NX 500W has a superior temperature coefficient of -0.29%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Silfab SIL-500-NX 500W uses TOPCon N-type cells while Astronergy ASTRO N5 460W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Silfab SIL-500-NX 500W achieves 21.8% module efficiency compared to Astronergy ASTRO N5 460W's 21.3%, meaning Silfab SIL-500-NX 500W converts 0.5 percentage points more sunlight into electricity per square meter. In practical terms, the Silfab SIL-500-NX 500W produces 210.6 watts per square meter of panel area while the Astronergy ASTRO N5 460W produces 230.2 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 Silfab SIL-500-NX 500W delivers 500W per panel versus 460W for the Astronergy ASTRO N5 460W, a 40W difference per module. To build an 8 kW residential system, you would need 16 Silfab SIL-500-NX 500W panels or 18 Astronergy ASTRO N5 460W panels. Choosing the higher-wattage option saves 2 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 Silfab SIL-500-NX 500W has a temperature coefficient of -0.29%/°C versus -0.34%/°C for the Astronergy ASTRO N5 460W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Silfab SIL-500-NX 500W 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 Silfab SIL-500-NX 500W is backed by a 25-year product warranty and 30-year performance guarantee, while the Astronergy ASTRO N5 460W offers 12-year product and 25-year performance coverage. The Silfab SIL-500-NX 500W provides 13 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1% first year then 0.4%/year for Silfab SIL-500-NX 500W; 1.5% first year then 0.5%/year for Astronergy ASTRO N5 460W), after 25 years the Silfab SIL-500-NX 500W should retain approximately 89.4% of original output versus 86.5% for the Astronergy ASTRO N5 460W. This 2.9 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Silfab SIL-500-NX 500W measures 2094×1134×30mm and weighs 25.5 kg, while the Astronergy ASTRO N5 460W measures 1762×1134×30mm at 23 kg. 2.37 m² of panel area for the Silfab SIL-500-NX 500W versus 2.00 m² for the Astronergy ASTRO N5 460W. The Astronergy ASTRO N5 460W is 2.5 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 50 kg. The more compact Astronergy ASTRO N5 460W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Silfab SIL-500-NX 500W | Astronergy ASTRO N5 460W |
|---|---|---|
| Power | 500W | 460W |
| Efficiency | 21.8% | 21.3% |
| Power Density | 19.6 W/sq ft | 21.4 W/sq ft |
| Cell Type | TOPCon N-type | PERC Mono |
| Bifacial | No | Yes |
| Weight | 25.5 kg | 23 kg |
| Temp Coefficient | -0.29%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 12 years |
| Performance Warranty | 30 years | 25 years |
| Degradation (Year 1) | 1% | 1.5% |
| Annual Degradation | 0.4% | 0.5% |
| Country | United States | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Silfab SIL-500-NX 500WThe Silfab SIL-500-NX 500W achieves 21.8% efficiency versus 21.3% — a 0.5 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.2 kW more total system capacity, or 6 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Silfab SIL-500-NX 500WThe Silfab SIL-500-NX 500W 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: Silfab SIL-500-NX 500WSilfab SIL-500-NX 500W leads with a 25-year product warranty versus 12 years. Silfab SIL-500-NX 500W degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 89.4% vs 86.5% of original output for Silfab SIL-500-NX 500W and Astronergy ASTRO N5 460W respectively.
4. Power Output
Winner: Silfab SIL-500-NX 500WThe Silfab SIL-500-NX 500W delivers 500W versus 460W per panel — 40W more. For an 8 kW system, you need 16 panels with the higher-wattage option versus 18 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Silfab SIL-500-NX 500WThe Silfab SIL-500-NX 500W 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 Astronergy ASTRO N5 460W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. TOPCon N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
Silfab SIL-500-NX 500W
Silfab SIL-500-NX is a US-manufactured N-type TOPCon panel delivering 500W with domestic production benefits and a 25-year warranty.
Pros
- + Made in USA
- + 25-year product warranty
- + N-type TOPCon technology
- + Strong domestic support
Cons
- - Higher cost than imports
- - Moderate efficiency
- - Limited brand awareness
Astronergy ASTRO N5 460W
The ASTRO N5 is a mid-range PERC panel delivering 460W for residential and commercial installations at a value price point.
Pros
- + Good value per watt
- + Mid-size format
- + CHINT Group backing
- + Widely available globally
Cons
- - Older PERC technology
- - Standard efficiency
- - Less known in US
Choose Silfab SIL-500-NX 500W 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
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ 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
Choose Astronergy ASTRO N5 460W If...
- ✓ Value-oriented projects seeking competitive PERC pricing from a global manufacturer.
Our Recommendation
The Silfab SIL-500-NX 500W is the decisive winner in this solar panel comparison, outperforming the Astronergy ASTRO N5 460W in 5 of 5 dimensions. Unless you have a specific requirement that the Astronergy ASTRO N5 460W uniquely addresses, the Silfab SIL-500-NX 500W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Silfab SIL-500-NX 500W or Astronergy ASTRO N5 460W?
The Silfab SIL-500-NX 500W wins this comparison by a decisive margin. It leads in efficiency (21.8% vs 21.3%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Silfab SIL-500-NX 500W is the stronger choice.
Which panel is more efficient, Silfab SIL-500-NX 500W or Astronergy ASTRO N5 460W?
The Silfab SIL-500-NX 500W at 21.8% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.5 percentage points translates to approximately 40W per panel under standard test conditions.
Which has a better warranty, Silfab SIL-500-NX 500W or Astronergy ASTRO N5 460W?
The Silfab SIL-500-NX 500W comes with a 25-year product warranty and 30-year performance guarantee. The Astronergy ASTRO N5 460W offers 12-year product and 25-year performance warranties. Silfab SIL-500-NX 500W provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The Silfab SIL-500-NX 500W has a temperature coefficient of -0.29%/°C and the Astronergy ASTRO N5 460W is -0.34%/°C. Silfab SIL-500-NX 500W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Silfab SIL-500-NX 500W vs Astronergy ASTRO N5 460W panels do I need for an 8 kW system?
For an 8 kW system: you need 16 Silfab SIL-500-NX 500W panels (500W each) or 18 Astronergy ASTRO N5 460W panels (460W each). The Silfab SIL-500-NX 500W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026