Silfab SIL-410-BG 410W vs Hyundai HiE-S420VG
The Hyundai HiE-S420VG wins this comparison by a narrow margin. It leads in efficiency (21.5% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Key Differences
- • Silfab SIL-410-BG 410W is rated at 410W while Hyundai HiE-S420VG is rated at 420W, a 10W difference.
- • Hyundai HiE-S420VG achieves 21.5% efficiency vs 21.2% for the other, a 0.3 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Hyundai HiE-S420VG has a superior temperature coefficient of -0.3%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Silfab SIL-410-BG 410W uses PERC Mono cells while Hyundai HiE-S420VG uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Hyundai HiE-S420VG achieves 21.5% module efficiency compared to Silfab SIL-410-BG 410W's 21.2%, meaning Hyundai HiE-S420VG converts 0.3 percentage points more sunlight into electricity per square meter. In practical terms, the Silfab SIL-410-BG 410W produces 210.0 watts per square meter of panel area while the Hyundai HiE-S420VG produces 215.1 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 Hyundai HiE-S420VG delivers 420W per panel versus 410W for the Silfab SIL-410-BG 410W, a 10W difference per module. To build an 8 kW residential system, you would need 20 Silfab SIL-410-BG 410W panels or 20 Hyundai HiE-S420VG panels. Despite the per-panel wattage difference, both require the same number of panels for this system size due to rounding. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Hyundai HiE-S420VG has a temperature coefficient of -0.3%/°C versus -0.34%/°C for the Silfab SIL-410-BG 410W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Hyundai HiE-S420VG retains 94.0% of its rated power while the other retains 93.2%. 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 SIL-410-BG 410W 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 SIL-410-BG 410W; 1% first year then 0.4%/year for Hyundai HiE-S420VG), after 25 years the Silfab SIL-410-BG 410W 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 SIL-410-BG 410W measures 1722×1134×30mm and weighs 21 kg, while the Hyundai HiE-S420VG measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Silfab SIL-410-BG 410W 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 SIL-410-BG 410W | Hyundai HiE-S420VG |
|---|---|---|
| Power | 410W | 420W |
| Efficiency | 21.2% | 21.5% |
| Power Density | 19.5 W/sq ft | 20.0 W/sq ft |
| Cell Type | PERC Mono | TOPCon N-type |
| Bifacial | No | No |
| Weight | 21 kg | 21 kg |
| Temp Coefficient | -0.34%/°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: Hyundai HiE-S420VGThe Hyundai HiE-S420VG achieves 21.5% efficiency versus 21.2% — a 0.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.3 kW more total system capacity, or 2 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Hyundai HiE-S420VGThe Hyundai HiE-S420VG has a better temperature coefficient of -0.3%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.0% of rated power versus 93.2%. 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: Hyundai HiE-S420VGThe Hyundai HiE-S420VG delivers 420W versus 410W per panel — 10W more. For an 8 kW system, you need 20 panels with the higher-wattage option versus 20 panels, saving 0 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Hyundai HiE-S420VGThe Silfab SIL-410-BG 410W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The Hyundai HiE-S420VG 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. TOPCon N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
Silfab SIL-410-BG 410W
The SIL-410-BG is Silfab's all-black residential PERC panel offering 410W with US manufacturing and a 25-year warranty.
Pros
- + US manufactured
- + All-black aesthetics
- + 25-year warranty
- + ARRA compliant
Cons
- - Standard PERC efficiency
- - Higher cost per watt
- - Limited model range
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 SIL-410-BG 410W If...
- ✓ Homeowners wanting US-made, all-black panels with Buy America compliance.
Choose Hyundai HiE-S420VG 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 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 SIL-410-BG 410W and Hyundai HiE-S420VG are excellent solar panel options, and the margin between them is narrow. The Hyundai HiE-S420VG wins 4 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 SIL-410-BG 410W or Hyundai HiE-S420VG?
The Hyundai HiE-S420VG wins this comparison by a narrow margin. It leads in efficiency (21.5% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Which panel is more efficient, Silfab SIL-410-BG 410W or Hyundai HiE-S420VG?
The Hyundai HiE-S420VG at 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 0.3 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, Silfab SIL-410-BG 410W or Hyundai HiE-S420VG?
The Silfab SIL-410-BG 410W 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 SIL-410-BG 410W has a temperature coefficient of -0.34%/°C and the Hyundai HiE-S420VG is -0.3%/°C. Hyundai HiE-S420VG 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-410-BG 410W vs Hyundai HiE-S420VG panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Silfab SIL-410-BG 410W panels (410W each) or 20 Hyundai HiE-S420VG panels (420W each). The Hyundai HiE-S420VG requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026