Renogy 450W Bifacial Mono Solar Panel vs Hyundai HiE-S420VG
The Hyundai HiE-S420VG wins this comparison by a decisive margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Key Differences
- • Renogy 450W Bifacial Mono Solar Panel is rated at 450W while Hyundai HiE-S420VG is rated at 420W, a 30W difference.
- • Renogy 450W Bifacial Mono Solar Panel achieves 22.8% efficiency vs 21.5% for the other, a 1.3 percentage point gap.
- • Hyundai HiE-S420VG comes with a 25-year product warranty vs 12 years for the other.
- • Renogy 450W Bifacial Mono Solar Panel has a superior temperature coefficient of -0.29%/°C vs -0.3%/°C, retaining more power in hot climates.
- • Renogy 450W Bifacial Mono Solar Panel uses N-Type Monocrystalline cells while Hyundai HiE-S420VG uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Renogy 450W Bifacial Mono Solar Panel achieves 22.8% module efficiency compared to Hyundai HiE-S420VG's 21.5%, meaning Renogy 450W Bifacial Mono Solar Panel converts 1.3 percentage points more sunlight into electricity per square meter. In practical terms, the Renogy 450W Bifacial Mono Solar Panel produces 233.1 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 Renogy 450W Bifacial Mono Solar Panel delivers 450W per panel versus 420W for the Hyundai HiE-S420VG, a 30W difference per module. To build an 8 kW residential system, you would need 18 Renogy 450W Bifacial Mono Solar Panel panels or 20 Hyundai HiE-S420VG 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 Renogy 450W Bifacial Mono Solar Panel 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 Renogy 450W Bifacial Mono Solar Panel 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 Renogy 450W Bifacial Mono Solar Panel is backed by a 12-year product warranty and 25-year performance guarantee, while the Hyundai HiE-S420VG offers 25-year product and 25-year performance coverage. The Hyundai HiE-S420VG 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 Renogy 450W Bifacial Mono Solar Panel; 1% first year then 0.4%/year for Hyundai HiE-S420VG), after 25 years the Renogy 450W Bifacial Mono Solar Panel 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 Renogy 450W Bifacial Mono Solar Panel measures 1801×1072×30mm and weighs 24.2 kg, while the Hyundai HiE-S420VG measures 1722×1134×30mm at 21 kg. 1.93 m² of panel area for the Renogy 450W Bifacial Mono Solar Panel versus 1.95 m² for the Hyundai HiE-S420VG. The Hyundai HiE-S420VG is 3.2 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 64 kg. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Renogy 450W Bifacial Mono Solar Panel | Hyundai HiE-S420VG |
|---|---|---|
| Power | 450W | 420W |
| Efficiency | 22.8% | 21.5% |
| Power Density | 21.7 W/sq ft | 20.0 W/sq ft |
| Cell Type | N-Type Monocrystalline | TOPCon N-type |
| Bifacial | Yes | No |
| Weight | 24.2 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 | 12 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | China | South Korea |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Renogy 450W Bifacial Mono Solar PanelThe Renogy 450W Bifacial Mono Solar Panel achieves 22.8% efficiency versus 21.5% — a 1.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.9 kW more total system capacity, or 5 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Renogy 450W Bifacial Mono Solar PanelThe Renogy 450W Bifacial Mono Solar Panel 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: Hyundai HiE-S420VGHyundai HiE-S420VG leads with a 25-year product warranty versus 12 years. After 25 years, expect 89.4% vs 89.4% of original output for Renogy 450W Bifacial Mono Solar Panel and Hyundai HiE-S420VG respectively.
4. Power Output
Winner: Renogy 450W Bifacial Mono Solar PanelThe Renogy 450W Bifacial Mono Solar Panel delivers 450W versus 420W per panel — 30W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 20 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Hyundai HiE-S420VGThe Renogy 450W Bifacial Mono Solar Panel uses N-Type Monocrystalline: N-Type Monocrystalline. 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.
Renogy 450W Bifacial Mono Solar Panel
The Renogy 450W Bifacial Mono Solar Panel is Renogy's flagship residential/commercial panel, combining N-Type monocrystalline cells with bifacial technology for up to 25% additional energy gain from reflected light.
Pros
- + Bifacial design with up to 25% energy gain
- + 22.8% efficiency with N-Type cells
- + 12-year product warranty — Renogy's longest
- + Good temperature coefficient at -0.29%/°C
- + UL 1703 certified for residential and commercial
Cons
- - 24.2 kg heavier than most residential panels
- - Bifacial gain requires proper mounting height and ground albedo
- - Higher upfront cost than monofacial alternatives
- - Large 1.93 m² footprint
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 Renogy 450W Bifacial Mono Solar Panel 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
- ✓ Residential and commercial installations seeking maximum energy harvest with bifacial gain, especially ground-mount systems.
Choose Hyundai HiE-S420VG If...
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ 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
The Hyundai HiE-S420VG is the decisive winner in this solar panel comparison, outperforming the Renogy 450W Bifacial Mono Solar Panel in 2 of 5 dimensions. Unless you have a specific requirement that the Renogy 450W Bifacial Mono Solar Panel uniquely addresses, the Hyundai HiE-S420VG is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Renogy 450W Bifacial Mono Solar Panel or Hyundai HiE-S420VG?
The Hyundai HiE-S420VG wins this comparison by a decisive margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Which panel is more efficient, Renogy 450W Bifacial Mono Solar Panel or Hyundai HiE-S420VG?
The Renogy 450W Bifacial Mono Solar Panel at 22.8% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.3 percentage points translates to approximately 30W per panel under standard test conditions.
Which has a better warranty, Renogy 450W Bifacial Mono Solar Panel or Hyundai HiE-S420VG?
The Renogy 450W Bifacial Mono Solar Panel comes with a 12-year product warranty and 25-year performance guarantee. The Hyundai HiE-S420VG offers 25-year product and 25-year performance warranties. Hyundai HiE-S420VG provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The Renogy 450W Bifacial Mono Solar Panel has a temperature coefficient of -0.29%/°C and the Hyundai HiE-S420VG is -0.3%/°C. Renogy 450W Bifacial Mono Solar Panel retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Renogy 450W Bifacial Mono Solar Panel vs Hyundai HiE-S420VG panels do I need for an 8 kW system?
For an 8 kW system: you need 18 Renogy 450W Bifacial Mono Solar Panel panels (450W each) or 20 Hyundai HiE-S420VG panels (420W each). The Renogy 450W Bifacial Mono Solar Panel requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026