Astronergy ASTRO N7 580W vs Hyundai HiE-S420VG
The Hyundai HiE-S420VG wins this comparison by a narrow 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
- • Astronergy ASTRO N7 580W is rated at 580W while Hyundai HiE-S420VG is rated at 420W, a 160W difference.
- • Astronergy ASTRO N7 580W achieves 22.4% efficiency vs 21.5% for the other, a 0.9 percentage point gap.
- • Hyundai HiE-S420VG comes with a 25-year product warranty vs 15 years for the other.
- • Astronergy ASTRO N7 580W has a superior temperature coefficient of -0.29%/°C vs -0.3%/°C, retaining more power in hot climates.
Specifications Breakdown
Module Efficiency
The Astronergy ASTRO N7 580W achieves 22.4% module efficiency compared to Hyundai HiE-S420VG's 21.5%, meaning Astronergy ASTRO N7 580W converts 0.9 percentage points more sunlight into electricity per square meter. In practical terms, the Astronergy ASTRO N7 580W produces 224.5 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 Astronergy ASTRO N7 580W delivers 580W per panel versus 420W for the Hyundai HiE-S420VG, a 160W difference per module. To build an 8 kW residential system, you would need 14 Astronergy ASTRO N7 580W panels or 20 Hyundai HiE-S420VG panels. Choosing the higher-wattage option saves 6 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 Astronergy ASTRO N7 580W 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 Astronergy ASTRO N7 580W 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 Astronergy ASTRO N7 580W is backed by a 15-year product warranty and 30-year performance guarantee, while the Hyundai HiE-S420VG offers 25-year product and 25-year performance coverage. The Hyundai HiE-S420VG provides 10 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 Astronergy ASTRO N7 580W; 1% first year then 0.4%/year for Hyundai HiE-S420VG), after 25 years the Astronergy ASTRO N7 580W 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 Astronergy ASTRO N7 580W measures 2278×1134×35mm and weighs 28.5 kg, while the Hyundai HiE-S420VG measures 1722×1134×30mm at 21 kg. 2.58 m² of panel area for the Astronergy ASTRO N7 580W versus 1.95 m² for the Hyundai HiE-S420VG. The Hyundai HiE-S420VG is 7.5 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 150 kg. The more compact Hyundai HiE-S420VG may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Astronergy ASTRO N7 580W | Hyundai HiE-S420VG |
|---|---|---|
| Power | 580W | 420W |
| Efficiency | 22.4% | 21.5% |
| Power Density | 20.9 W/sq ft | 20.0 W/sq ft |
| Cell Type | TOPCon N-type | TOPCon N-type |
| Bifacial | Yes | No |
| Weight | 28.5 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 | 15 years | 25 years |
| Performance Warranty | 30 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: Astronergy ASTRO N7 580WThe Astronergy ASTRO N7 580W achieves 22.4% efficiency versus 21.5% — a 0.9 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 4.8 kW more total system capacity, or 22 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Astronergy ASTRO N7 580WThe Astronergy ASTRO N7 580W 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 15 years. After 25 years, expect 89.4% vs 89.4% of original output for Astronergy ASTRO N7 580W and Hyundai HiE-S420VG respectively.
4. Power Output
Winner: Astronergy ASTRO N7 580WThe Astronergy ASTRO N7 580W delivers 580W versus 420W per panel — 160W more. For an 8 kW system, you need 14 panels with the higher-wattage option versus 20 panels, saving 6 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieBoth panels use TOPCon N-type cell technology. No technology advantage for either product.
Astronergy ASTRO N7 580W
Astronergy ASTRO N7 delivers 580W with TOPCon N-type technology, backed by CHINT Group's manufacturing scale and reliability.
Pros
- + High 580W output
- + N-type TOPCon efficiency
- + Strong manufacturing backing
- + Competitive pricing
Cons
- - Less known brand in US
- - Limited installer network
- - Large form factor
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 Astronergy ASTRO N7 580W 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
- ✓ Large residential and commercial systems seeking competitive N-type pricing.
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
Both the Astronergy ASTRO N7 580W and Hyundai HiE-S420VG are excellent solar panel options, and the margin between them is narrow. The Hyundai HiE-S420VG 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, Astronergy ASTRO N7 580W or Hyundai HiE-S420VG?
The Hyundai HiE-S420VG wins this comparison by a narrow 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, Astronergy ASTRO N7 580W or Hyundai HiE-S420VG?
The Astronergy ASTRO N7 580W at 22.4% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.9 percentage points translates to approximately 160W per panel under standard test conditions.
Which has a better warranty, Astronergy ASTRO N7 580W or Hyundai HiE-S420VG?
The Astronergy ASTRO N7 580W comes with a 15-year product warranty and 30-year performance guarantee. The Hyundai HiE-S420VG offers 25-year product and 25-year performance warranties. Hyundai HiE-S420VG provides 10 additional years of product coverage.
Which panel performs better in hot weather?
The Astronergy ASTRO N7 580W has a temperature coefficient of -0.29%/°C and the Hyundai HiE-S420VG is -0.3%/°C. Astronergy ASTRO N7 580W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Astronergy ASTRO N7 580W vs Hyundai HiE-S420VG panels do I need for an 8 kW system?
For an 8 kW system: you need 14 Astronergy ASTRO N7 580W panels (580W each) or 20 Hyundai HiE-S420VG panels (420W each). The Astronergy ASTRO N7 580W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026