LONGi Hi-MO X6 445W vs Astronergy ASTRO N7 580W
The Astronergy ASTRO N7 580W wins this comparison by a decisive margin. It leads in efficiency (22.4% vs 22%) and matches or exceeds on warranty (15 vs 12 years). For most residential installations, the Astronergy ASTRO N7 580W is the stronger choice.
Key Differences
- • LONGi Hi-MO X6 445W is rated at 445W while Astronergy ASTRO N7 580W is rated at 580W, a 135W difference.
- • Astronergy ASTRO N7 580W achieves 22.4% efficiency vs 22% for the other, a 0.4 percentage point gap.
- • Astronergy ASTRO N7 580W comes with a 15-year product warranty vs 12 years for the other.
Specifications Breakdown
Module Efficiency
The Astronergy ASTRO N7 580W achieves 22.4% module efficiency compared to LONGi Hi-MO X6 445W's 22%, meaning Astronergy ASTRO N7 580W converts 0.4 percentage points more sunlight into electricity per square meter. In practical terms, the LONGi Hi-MO X6 445W produces 227.9 watts per square meter of panel area while the Astronergy ASTRO N7 580W produces 224.5 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 445W for the LONGi Hi-MO X6 445W, a 135W difference per module. To build an 8 kW residential system, you would need 18 LONGi Hi-MO X6 445W panels or 14 Astronergy ASTRO N7 580W panels. Choosing the higher-wattage option saves 4 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 -0.29%/°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 94.2% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The LONGi Hi-MO X6 445W is backed by a 12-year product warranty and 25-year performance guarantee, while the Astronergy ASTRO N7 580W offers 15-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 LONGi Hi-MO X6 445W; 1% first year then 0.4%/year for Astronergy ASTRO N7 580W), after 25 years the LONGi Hi-MO X6 445W should retain approximately 89.4% of original output versus 89.4% for the Astronergy ASTRO N7 580W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The LONGi Hi-MO X6 445W measures 1722×1134×30mm and weighs 21.5 kg, while the Astronergy ASTRO N7 580W measures 2278×1134×35mm at 28.5 kg. 1.95 m² of panel area for the LONGi Hi-MO X6 445W versus 2.58 m² for the Astronergy ASTRO N7 580W. The LONGi Hi-MO X6 445W 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 LONGi Hi-MO X6 445W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | LONGi Hi-MO X6 445W | Astronergy ASTRO N7 580W |
|---|---|---|
| Power | 445W | 580W |
| Efficiency | 22% | 22.4% |
| Power Density | 21.2 W/sq ft | 20.9 W/sq ft |
| Cell Type | TOPCon N-type | TOPCon N-type |
| Bifacial | Yes | Yes |
| Weight | 21.5 kg | 28.5 kg |
| Temp Coefficient | -0.29%/°C | -0.29%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 15 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Astronergy ASTRO N7 580WThe Astronergy ASTRO N7 580W achieves 22.4% efficiency versus 22% — a 0.4 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 4.0 kW more total system capacity, or 19 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: TieBoth panels share a temperature coefficient of -0.29%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: Astronergy ASTRO N7 580WAstronergy ASTRO N7 580W leads with a 15-year product warranty versus 12 years. After 25 years, expect 89.4% vs 89.4% of original output for LONGi Hi-MO X6 445W and Astronergy ASTRO N7 580W respectively.
4. Power Output
Winner: Astronergy ASTRO N7 580WThe Astronergy ASTRO N7 580W delivers 580W versus 445W per panel — 135W more. For an 8 kW system, you need 14 panels with the higher-wattage option versus 18 panels, saving 4 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.
LONGi Hi-MO X6 445W
The Hi-MO X6 is LONGi's TOPCon N-type line offering 445W in a compact format, well-suited for space-constrained residential rooftops.
Pros
- + Compact size for residential roofs
- + Good N-type TOPCon efficiency
- + Advanced technology
- + Budget-friendly
Cons
- - Lower wattage than larger models
- - Mid-range efficiency for N-type
- - Less suited for very large roofs
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
Choose LONGi Hi-MO X6 445W If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Homeowners wanting N-type TOPCon technology in a compact residential format.
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
- ✓ 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.
Our Recommendation
The Astronergy ASTRO N7 580W is the decisive winner in this solar panel comparison, outperforming the LONGi Hi-MO X6 445W in 3 of 5 dimensions. Unless you have a specific requirement that the LONGi Hi-MO X6 445W uniquely addresses, the Astronergy ASTRO N7 580W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, LONGi Hi-MO X6 445W or Astronergy ASTRO N7 580W?
The Astronergy ASTRO N7 580W wins this comparison by a decisive margin. It leads in efficiency (22.4% vs 22%) and matches or exceeds on warranty (15 vs 12 years). For most residential installations, the Astronergy ASTRO N7 580W is the stronger choice.
Which panel is more efficient, LONGi Hi-MO X6 445W or Astronergy ASTRO N7 580W?
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 0.4 percentage points translates to approximately 135W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO X6 445W or Astronergy ASTRO N7 580W?
The LONGi Hi-MO X6 445W comes with a 12-year product warranty and 25-year performance guarantee. The Astronergy ASTRO N7 580W offers 15-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 LONGi Hi-MO X6 445W has a temperature coefficient of -0.29%/°C and the Astronergy ASTRO N7 580W is -0.29%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many LONGi Hi-MO X6 445W vs Astronergy ASTRO N7 580W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 LONGi Hi-MO X6 445W panels (445W each) or 14 Astronergy ASTRO N7 580W panels (580W each). The Astronergy ASTRO N7 580W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026