Astronergy ASTRO N7 580W vs LONGi Hi-MO 7 620W
The Astronergy ASTRO N7 580W wins this comparison by a narrow margin. It offers better long-term durability with 15-year warranty. For most residential installations, the Astronergy ASTRO N7 580W is the stronger choice.
Key Differences
- • Astronergy ASTRO N7 580W is rated at 580W while LONGi Hi-MO 7 620W is rated at 620W, a 40W difference.
- • LONGi Hi-MO 7 620W achieves 23% efficiency vs 22.4% for the other, a 0.6 percentage point gap.
- • Astronergy ASTRO N7 580W comes with a 15-year product warranty vs 12 years for the other.
- • LONGi Hi-MO 7 620W has a superior temperature coefficient of -0.28%/°C vs -0.29%/°C, retaining more power in hot climates.
- • Astronergy ASTRO N7 580W uses TOPCon N-type cells while LONGi Hi-MO 7 620W uses HPBC (Back Contact N-type) cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO 7 620W achieves 23% module efficiency compared to Astronergy ASTRO N7 580W's 22.4%, meaning LONGi Hi-MO 7 620W converts 0.6 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 LONGi Hi-MO 7 620W produces 229.3 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 LONGi Hi-MO 7 620W delivers 620W per panel versus 580W for the Astronergy ASTRO N7 580W, a 40W difference per module. To build an 8 kW residential system, you would need 14 Astronergy ASTRO N7 580W panels or 13 LONGi Hi-MO 7 620W 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 LONGi Hi-MO 7 620W has a temperature coefficient of -0.28%/°C versus -0.29%/°C for the Astronergy ASTRO N7 580W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the LONGi Hi-MO 7 620W retains 94.4% of its rated power while the other retains 94.2%. 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 Astronergy ASTRO N7 580W is backed by a 15-year product warranty and 30-year performance guarantee, while the LONGi Hi-MO 7 620W offers 12-year product and 30-year performance coverage. The Astronergy ASTRO N7 580W provides 3 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; 0.5% first year then 0.35%/year for LONGi Hi-MO 7 620W), after 25 years the Astronergy ASTRO N7 580W should retain approximately 89.4% of original output versus 91.1% for the LONGi Hi-MO 7 620W. This 1.7 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Astronergy ASTRO N7 580W measures 2278×1134×35mm and weighs 28.5 kg, while the LONGi Hi-MO 7 620W measures 2384×1134×35mm at 31 kg. 2.58 m² of panel area for the Astronergy ASTRO N7 580W versus 2.70 m² for the LONGi Hi-MO 7 620W. The Astronergy ASTRO N7 580W is 2.5 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 50 kg. The more compact Astronergy ASTRO N7 580W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Astronergy ASTRO N7 580W | LONGi Hi-MO 7 620W |
|---|---|---|
| Power | 580W | 620W |
| Efficiency | 22.4% | 23% |
| Power Density | 20.9 W/sq ft | 21.3 W/sq ft |
| Cell Type | TOPCon N-type | HPBC (Back Contact N-type) |
| Bifacial | Yes | Yes |
| Weight | 28.5 kg | 31 kg |
| Temp Coefficient | -0.29%/°C | -0.28%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 15 years | 12 years |
| Performance Warranty | 30 years | 30 years |
| Degradation (Year 1) | 1% | 0.5% |
| Annual Degradation | 0.4% | 0.35% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: LONGi Hi-MO 7 620WThe LONGi Hi-MO 7 620W achieves 23% efficiency versus 22.4% — a 0.6 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.2 kW more total system capacity, or 6 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: LONGi Hi-MO 7 620WThe LONGi Hi-MO 7 620W has a better temperature coefficient of -0.28%/°C versus -0.29%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.4% of rated power versus 94.2%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: Astronergy ASTRO N7 580WAstronergy ASTRO N7 580W leads with a 15-year product warranty versus 12 years. LONGi Hi-MO 7 620W degrades more slowly at 0.35% per year versus 0.4%. After 25 years, expect 89.4% vs 91.1% of original output for Astronergy ASTRO N7 580W and LONGi Hi-MO 7 620W respectively.
4. Power Output
Winner: LONGi Hi-MO 7 620WThe LONGi Hi-MO 7 620W delivers 620W versus 580W per panel — 40W more. For an 8 kW system, you need 13 panels with the higher-wattage option versus 14 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: LONGi Hi-MO 7 620WThe Astronergy ASTRO N7 580W 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 LONGi Hi-MO 7 620W uses HPBC (Back Contact N-type): HPBC (Hybrid Passivated Back Contact) is a proprietary LONGi architecture combining back-contact design with advanced passivation for both high efficiency and aesthetic uniformity. HPBC (Back Contact N-type) represents a newer generation technology with a longer performance runway as manufacturing matures.
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
LONGi Hi-MO 7 620W
The Hi-MO 7 620W is LONGi's highest-output panel using proprietary HPBC (Hybrid Passivated Back Contact) technology for exceptional efficiency. Newer LR7/LR8 variants support 620W+ output.
Pros
- + Highest LONGi output
- + HPBC cutting-edge back-contact technology
- + 23.0% efficiency
- + Excellent degradation profile
Cons
- - Very large form factor
- - Premium pricing
- - New technology
Choose Astronergy ASTRO N7 580W If...
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 15+ years
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Large residential and commercial systems seeking competitive N-type pricing.
Choose LONGi Hi-MO 7 620W 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 want maximum output retention over the system's 25-30 year lifespan
- ✓ Large installations wanting LONGi's most advanced HPBC technology.
Our Recommendation
Both the Astronergy ASTRO N7 580W and LONGi Hi-MO 7 620W are excellent solar panel options, and the margin between them is narrow. The Astronergy ASTRO N7 580W 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 LONGi Hi-MO 7 620W?
The Astronergy ASTRO N7 580W wins this comparison by a narrow margin. It offers better long-term durability with 15-year warranty. For most residential installations, the Astronergy ASTRO N7 580W is the stronger choice.
Which panel is more efficient, Astronergy ASTRO N7 580W or LONGi Hi-MO 7 620W?
The LONGi Hi-MO 7 620W at 23% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.6 percentage points translates to approximately 40W per panel under standard test conditions.
Which has a better warranty, Astronergy ASTRO N7 580W or LONGi Hi-MO 7 620W?
The Astronergy ASTRO N7 580W comes with a 15-year product warranty and 30-year performance guarantee. The LONGi Hi-MO 7 620W offers 12-year product and 30-year performance warranties. Astronergy ASTRO N7 580W provides 3 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 LONGi Hi-MO 7 620W is -0.28%/°C. LONGi Hi-MO 7 620W 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 LONGi Hi-MO 7 620W 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 13 LONGi Hi-MO 7 620W panels (620W each). The LONGi Hi-MO 7 620W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026