Solaria PowerXT 430R vs Hyundai HiE-S420VG
The Hyundai HiE-S420VG wins this comparison by a narrow margin. It leads in efficiency (21.5% vs 21.3%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Key Differences
- • Solaria PowerXT 430R is rated at 430W while Hyundai HiE-S420VG is rated at 420W, a 10W difference.
- • Hyundai HiE-S420VG achieves 21.5% efficiency vs 21.3% for the other, a 0.2 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.
- • Solaria PowerXT 430R uses Shingled Mono PERC 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 Solaria PowerXT 430R's 21.3%, meaning Hyundai HiE-S420VG converts 0.2 percentage points more sunlight into electricity per square meter. In practical terms, the Solaria PowerXT 430R produces 212.9 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 Solaria PowerXT 430R delivers 430W per panel versus 420W for the Hyundai HiE-S420VG, a 10W difference per module. To build an 8 kW residential system, you would need 19 Solaria PowerXT 430R panels or 20 Hyundai HiE-S420VG panels. Choosing the higher-wattage option saves 1 panel, 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 Hyundai HiE-S420VG has a temperature coefficient of -0.3%/°C versus -0.34%/°C for the Solaria PowerXT 430R. 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 Solaria PowerXT 430R is backed by a 25-year product warranty and 25-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 (1.5% first year then 0.4%/year for Solaria PowerXT 430R; 1% first year then 0.4%/year for Hyundai HiE-S420VG), after 25 years the Solaria PowerXT 430R should retain approximately 88.9% of original output versus 89.4% for the Hyundai HiE-S420VG. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Solaria PowerXT 430R measures 1879×1075×40mm and weighs 22 kg, while the Hyundai HiE-S420VG measures 1722×1134×30mm at 21 kg. 2.02 m² of panel area for the Solaria PowerXT 430R 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 | Solaria PowerXT 430R | Hyundai HiE-S420VG |
|---|---|---|
| Power | 430W | 420W |
| Efficiency | 21.3% | 21.5% |
| Power Density | 19.8 W/sq ft | 20.0 W/sq ft |
| Cell Type | Shingled Mono PERC | TOPCon N-type |
| Bifacial | No | No |
| Weight | 22 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 | 25 years | 25 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | USA | South Korea |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Hyundai HiE-S420VGThe Hyundai HiE-S420VG achieves 21.5% efficiency versus 21.3% — a 0.2 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: Solaria PowerXT 430RThe Solaria PowerXT 430R delivers 430W versus 420W per panel — 10W more. For an 8 kW system, you need 19 panels with the higher-wattage option versus 20 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Hyundai HiE-S420VGThe Solaria PowerXT 430R uses Shingled Mono PERC: 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.
Solaria PowerXT 430R
The Solaria PowerXT 430R is a US-manufactured shingled-cell solar panel that eliminates traditional busbars and cell gaps to maximize active cell area and deliver a sleek, uniform all-black appearance. Shingled cell technology overlaps cell strips like roof shingles, reducing inactive area by approximately 50% compared to traditional half-cut designs. This results in more power from the same panel area and improved shade tolerance due to the shingled cell interconnection pattern. Made in Fremont, California, the PowerXT qualifies for domestic content bonus ITC credits.
Pros
- + Shingled cell technology — more power per square foot than traditional panels
- + Sleek all-black appearance with no visible busbars or cell gaps
- + Made in USA (Fremont, CA) — qualifies for domestic content ITC bonus
- + Enhanced shade tolerance from shingled interconnection pattern
- + 25-year product and performance warranties
- + No hot spots — shingled design eliminates busbar-related failures
Cons
- - Premium pricing for US-manufactured shingled technology
- - 430W is competitive but not class-leading for this panel size
- - Shingled cell technology has less field history than traditional designs
- - Limited to Solaria-authorized installer network
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 Solaria PowerXT 430R If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ US homeowners who prioritize American-made panels with a premium all-black aesthetic and want domestic content ITC bonus eligibility.
Choose Hyundai HiE-S420VG If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ 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 Solaria PowerXT 430R and Hyundai HiE-S420VG are excellent solar panel options, and the margin between them is narrow. The Hyundai HiE-S420VG wins 3 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, Solaria PowerXT 430R or Hyundai HiE-S420VG?
The Hyundai HiE-S420VG wins this comparison by a narrow margin. It leads in efficiency (21.5% vs 21.3%) 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, Solaria PowerXT 430R 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 0.2 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, Solaria PowerXT 430R or Hyundai HiE-S420VG?
The Solaria PowerXT 430R comes with a 25-year product warranty and 25-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 Solaria PowerXT 430R 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 Solaria PowerXT 430R vs Hyundai HiE-S420VG panels do I need for an 8 kW system?
For an 8 kW system: you need 19 Solaria PowerXT 430R panels (430W each) or 20 Hyundai HiE-S420VG panels (420W each). The Solaria PowerXT 430R requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026