Hyundai HiE-S420VG vs Waaree WS-545 Bifacial
The Hyundai HiE-S420VG wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 21.2%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Key Differences
- • Hyundai HiE-S420VG is rated at 420W while Waaree WS-545 Bifacial is rated at 545W, a 125W difference.
- • Hyundai HiE-S420VG achieves 21.5% efficiency vs 21.2% for the other, a 0.3 percentage point gap.
- • Hyundai HiE-S420VG comes with a 25-year product warranty vs 12 years for the other.
- • Hyundai HiE-S420VG uses TOPCon N-type cells while Waaree WS-545 Bifacial uses TOPCon N-type Bifacial cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Hyundai HiE-S420VG achieves 21.5% module efficiency compared to Waaree WS-545 Bifacial's 21.2%, meaning Hyundai HiE-S420VG converts 0.3 percentage points more sunlight into electricity per square meter. In practical terms, the Hyundai HiE-S420VG produces 215.1 watts per square meter of panel area while the Waaree WS-545 Bifacial produces 211.0 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 Waaree WS-545 Bifacial delivers 545W per panel versus 420W for the Hyundai HiE-S420VG, a 125W difference per module. To build an 8 kW residential system, you would need 20 Hyundai HiE-S420VG panels or 15 Waaree WS-545 Bifacial panels. Choosing the higher-wattage option saves 5 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
Both panels share an identical temperature coefficient of -0.3%/°C, meaning they lose power at the same rate as cell temperature rises above the 25°C standard test baseline. At 65°C cell temperature, both retain 94.0% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Hyundai HiE-S420VG is backed by a 25-year product warranty and 25-year performance guarantee, while the Waaree WS-545 Bifacial offers 12-year product and 30-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 Hyundai HiE-S420VG; 1% first year then 0.4%/year for Waaree WS-545 Bifacial), after 25 years the Hyundai HiE-S420VG should retain approximately 89.4% of original output versus 89.4% for the Waaree WS-545 Bifacial. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Hyundai HiE-S420VG measures 1722×1134×30mm and weighs 21 kg, while the Waaree WS-545 Bifacial measures 2278×1134×35mm at 28 kg. 1.95 m² of panel area for the Hyundai HiE-S420VG versus 2.58 m² for the Waaree WS-545 Bifacial. The Hyundai HiE-S420VG is 7.0 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 140 kg. The more compact Hyundai HiE-S420VG may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Hyundai HiE-S420VG | Waaree WS-545 Bifacial |
|---|---|---|
| Power | 420W | 545W |
| Efficiency | 21.5% | 21.2% |
| Power Density | 20.0 W/sq ft | 19.6 W/sq ft |
| Cell Type | TOPCon N-type | TOPCon N-type Bifacial |
| Bifacial | No | Yes |
| Weight | 21 kg | 28 kg |
| Temp Coefficient | -0.3%/°C | -0.3%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 12 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | South Korea | India |
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 3.8 kW more total system capacity, or 17 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: TieBoth panels share a temperature coefficient of -0.3%/°C — identical heat tolerance.
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 Hyundai HiE-S420VG and Waaree WS-545 Bifacial respectively.
4. Power Output
Winner: Waaree WS-545 BifacialThe Waaree WS-545 Bifacial delivers 545W versus 420W per panel — 125W more. For an 8 kW system, you need 15 panels with the higher-wattage option versus 20 panels, saving 5 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe 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. The Waaree WS-545 Bifacial uses TOPCon N-type Bifacial: 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. Both are equivalent-generation technologies.
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
Waaree WS-545 Bifacial
The Waaree WS-545 Bifacial is a 545W TOPCon N-type bifacial panel from India's largest solar module manufacturer. Waaree Energies has rapidly scaled to become a top-10 global solar manufacturer, and the WS-545 represents their flagship utility and commercial product. The bifacial design captures reflected light from the rear side for 5-25% additional energy gain depending on ground albedo. The N-type TOPCon cells deliver -0.30%/°C temperature coefficient and lower degradation than PERC. Waaree's Indian manufacturing provides an alternative supply chain to Chinese panels, particularly relevant for markets implementing anti-dumping duties.
Pros
- + Indian manufacturing — alternative to Chinese supply chain
- + Bifacial design adds 5-25% energy gain from rear side
- + TOPCon N-type with -0.30%/°C temp coefficient
- + Competitive pricing — among the most affordable TOPCon bifacial panels
- + 30-year performance warranty with low 0.4% annual degradation
- + Waaree is India's largest module manufacturer with 12+ GW capacity
Cons
- - Limited US brand recognition and distribution
- - 12-year product warranty shorter than premium brands' 25 years
- - 545W is mid-range — Chinese competitors offer 580W+ in same size
- - Bifacial gain requires appropriate mounting (ground or elevated rack)
Choose Hyundai HiE-S420VG If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ 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.
Choose Waaree WS-545 Bifacial If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Commercial and utility-scale projects seeking cost-effective TOPCon bifacial panels from a non-Chinese supply chain, and ground-mount residential systems where bifacial gain is maximized.
Our Recommendation
The Hyundai HiE-S420VG is the decisive winner in this solar panel comparison, outperforming the Waaree WS-545 Bifacial in 2 of 5 dimensions. Unless you have a specific requirement that the Waaree WS-545 Bifacial uniquely addresses, the Hyundai HiE-S420VG is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Hyundai HiE-S420VG or Waaree WS-545 Bifacial?
The Hyundai HiE-S420VG wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 21.2%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Hyundai HiE-S420VG is the stronger choice.
Which panel is more efficient, Hyundai HiE-S420VG or Waaree WS-545 Bifacial?
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 125W per panel under standard test conditions.
Which has a better warranty, Hyundai HiE-S420VG or Waaree WS-545 Bifacial?
The Hyundai HiE-S420VG comes with a 25-year product warranty and 25-year performance guarantee. The Waaree WS-545 Bifacial offers 12-year product and 30-year performance warranties. Hyundai HiE-S420VG provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The Hyundai HiE-S420VG has a temperature coefficient of -0.3%/°C and the Waaree WS-545 Bifacial is -0.3%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Hyundai HiE-S420VG vs Waaree WS-545 Bifacial panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Hyundai HiE-S420VG panels (420W each) or 15 Waaree WS-545 Bifacial panels (545W each). The Waaree WS-545 Bifacial requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026