Silfab Elite SIL-420 vs Hyundai HiE-S420VG
The Silfab Elite SIL-420 wins this comparison by a narrow margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Silfab Elite SIL-420 is the stronger choice.
Key Differences
- • Both panels are rated at 420W, so the comparison comes down to efficiency, warranty, and technology.
- • Both achieve identical 21.5% module efficiency.
- • Both carry matching 25-year product warranties.
- • Silfab Elite SIL-420 has a superior temperature coefficient of -0.29%/°C vs -0.3%/°C, retaining more power in hot climates.
Specifications Breakdown
Module Efficiency
Both the Silfab Elite SIL-420 and Hyundai HiE-S420VG share identical 21.5% module efficiency, producing comparable power per unit area. The Silfab Elite SIL-420 generates 215.1 W/m² while the Hyundai HiE-S420VG generates 215.1 W/m² based on their respective panel dimensions. With matched efficiency, neither panel holds a density advantage for space-constrained rooftop installations, so other factors like warranty coverage and temperature performance become the deciding metrics.
Power Output
Both panels are rated at 420W under standard test conditions (STC), requiring 20 panels each to build an 8 kW system. With identical wattage ratings, the power output dimension is a draw and does not favor either panel. The real differentiators become efficiency density, temperature behavior, and long-term degradation rates which determine actual field performance beyond the nameplate rating.
Temperature Coefficient
The Silfab Elite SIL-420 has a temperature coefficient of -0.29%/°C versus -0.3%/°C for the Hyundai HiE-S420VG. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Silfab Elite SIL-420 retains 94.2% of its rated power while the other retains 94.0%. While the numerical gap is modest, it still accumulates over decades of summer production, especially in southern latitudes with prolonged peak heat hours.
Warranty Coverage
The Silfab Elite SIL-420 is backed by a 25-year product warranty and 30-year performance guarantee, while the Hyundai HiE-S420VG offers 25-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1% first year then 0.4%/year for Silfab Elite SIL-420; 1% first year then 0.4%/year for Hyundai HiE-S420VG), after 25 years the Silfab Elite SIL-420 should retain approximately 89.4% of original output versus 89.4% for the Hyundai HiE-S420VG. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Silfab Elite SIL-420 measures 1722×1134×30mm and weighs 21.5 kg, while the Hyundai HiE-S420VG measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Silfab Elite SIL-420 versus 1.95 m² for the Hyundai HiE-S420VG. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Silfab Elite SIL-420 | Hyundai HiE-S420VG |
|---|---|---|
| Power | 420W | 420W |
| Efficiency | 21.5% | 21.5% |
| Power Density | 20.0 W/sq ft | 20.0 W/sq ft |
| Cell Type | TOPCon N-type | TOPCon N-type |
| Bifacial | No | No |
| Weight | 21.5 kg | 21 kg |
| Temp Coefficient | -0.29%/°C | -0.3%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 30 years | 25 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | United States | South Korea |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: TieBoth panels achieve 21.5% module efficiency, producing identical power per square meter. Neither has an advantage in space-constrained installations.
2. Hot Climate Performance
Winner: Silfab Elite SIL-420The Silfab Elite SIL-420 has a better temperature coefficient of -0.29%/°C versus -0.3%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% of rated power versus 94.0%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: TieBoth panels offer identical 25-year product warranties and 0.4% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: TieBoth panels deliver 420W — identical power output per panel. System cost per watt will be the deciding factor.
5. Cell Technology
Winner: TieBoth panels use TOPCon N-type cell technology. No technology advantage for either product.
Silfab Elite SIL-420
The Silfab Elite SIL-420 is a premium US-made N-type panel delivering 420W with advanced TOPCon cells and domestic manufacturing.
Pros
- + US manufactured premium panel
- + N-type technology
- + 25-year warranty
- + ARRA compliant
Cons
- - Premium pricing
- - Moderate wattage
- - Limited distribution
Hyundai HiE-S420VG
The Hyundai HiE-S420VG is a 420W residential-format TOPCon N-type panel in the popular 108-cell configuration (1722 x 1134mm), matching the most common residential panel size for easy racking and roof fit. Korean manufacturing provides supply chain diversification, and the TOPCon N-type cells deliver better temperature performance (-0.30%/°C) and lower degradation than PERC alternatives. The standard residential form factor ensures compatibility with all major racking systems.
Pros
- + Standard 108-cell residential size — fits any racking system
- + Korean-made TOPCon N-type with 21.5% efficiency
- + -0.30%/°C temperature coefficient for hot climate performance
- + 25+25 year warranty backed by Hyundai corporate
- + Non-Chinese manufacturing for tariff and UFLPA considerations
- + 420W competitive output in standard residential format
Cons
- - 420W is competitive but not class-leading for 108-cell panels
- - Slightly higher per-watt cost than Chinese equivalents
- - Smaller US installer network and distribution
- - Less brand recognition in solar market despite Hyundai name
Choose Silfab Elite SIL-420 If...
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Premium residential installations requiring US-made N-type panels.
Choose Hyundai HiE-S420VG If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Residential homeowners wanting a standard-size Korean-manufactured TOPCon panel that fits any roof and racking system with strong corporate warranty backing.
Our Recommendation
Both the Silfab Elite SIL-420 and Hyundai HiE-S420VG are excellent solar panel options, and the margin between them is narrow. The Silfab Elite SIL-420 wins 1 of 5 comparison dimensions by a slim margin. Your decision may come down to local pricing, installer availability, and which specific performance metrics matter most for your project. Either product is a solid investment.
Frequently Asked Questions
Which is better, Silfab Elite SIL-420 or Hyundai HiE-S420VG?
The Silfab Elite SIL-420 wins this comparison by a narrow margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Silfab Elite SIL-420 is the stronger choice.
Which panel is more efficient, Silfab Elite SIL-420 or Hyundai HiE-S420VG?
The both panels share 21.5% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.0 percentage points translates to approximately 0W per panel under standard test conditions.
Which has a better warranty, Silfab Elite SIL-420 or Hyundai HiE-S420VG?
The Silfab Elite SIL-420 comes with a 25-year product warranty and 30-year performance guarantee. The Hyundai HiE-S420VG offers 25-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Silfab Elite SIL-420 has a temperature coefficient of -0.29%/°C and the Hyundai HiE-S420VG is -0.3%/°C. Silfab Elite SIL-420 retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Silfab Elite SIL-420 vs Hyundai HiE-S420VG panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Silfab Elite SIL-420 panels (420W each) or 20 Hyundai HiE-S420VG panels (420W each). Both require the same number of panels.
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Last updated: February 2026