LONGi Hi-MO 6 580W vs Astronergy ASTRO N7 580W
The Astronergy ASTRO N7 580W wins with 22.4% TOPCon efficiency versus LONGi Hi-MO 6's 22.3% using PERC technology. Like the Tiger Neo vs Hi-MO 6 comparison, the key advantage is TOPCon's inherently superior degradation profile and temperature performance over PERC, not just the 0.1% efficiency difference.
Both panels deliver 580W, but the ASTRO N7's n-type TOPCon architecture provides a technology generation advantage over the Hi-MO 6's PERC design. For commercial installations where these large-format panels are typically used, the ASTRO N7's better long-term performance metrics make it the stronger investment.
Key Differences
- • Both panels are rated at 580W, so the comparison comes down to efficiency, warranty, and technology.
- • Astronergy ASTRO N7 580W achieves 22.4% efficiency vs 22.3% for the other, a 0.1 percentage point gap.
- • Astronergy ASTRO N7 580W comes with a 15-year product warranty vs 12 years for the other.
- • Astronergy ASTRO N7 580W has a superior temperature coefficient of -0.29%/°C vs -0.34%/°C, retaining more power in hot climates.
- • LONGi Hi-MO 6 580W uses PERC Mono Half-cut cells while Astronergy ASTRO N7 580W uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Astronergy ASTRO N7 580W achieves 22.4% module efficiency compared to LONGi Hi-MO 6 580W's 22.3%, meaning Astronergy ASTRO N7 580W converts 0.1 percentage points more sunlight into electricity per square meter. In practical terms, the LONGi Hi-MO 6 580W produces 224.5 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
Both panels are rated at 580W under standard test conditions (STC), requiring 14 panels each to build an 8 kW system. With identical wattage ratings, the power output dimension is a draw and does not favor either panel. The real differentiators become efficiency density, temperature behavior, and long-term degradation rates which determine actual field performance beyond the nameplate rating.
Temperature Coefficient
The Astronergy ASTRO N7 580W has a temperature coefficient of -0.29%/°C versus -0.34%/°C for the LONGi Hi-MO 6 580W. 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 93.2%. This difference is particularly significant in hot climates such as the American Southwest, the Middle East, and Southeast Asia, where panels routinely operate 30-40°C above STC for several hours each day. Over the system lifetime, the cumulative energy advantage from a better temperature coefficient can amount to 2-4% of total production.
Warranty Coverage
The LONGi Hi-MO 6 580W 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 (1.5% first year then 0.5%/year for LONGi Hi-MO 6 580W; 1% first year then 0.4%/year for Astronergy ASTRO N7 580W), after 25 years the LONGi Hi-MO 6 580W should retain approximately 86.5% of original output versus 89.4% for the Astronergy ASTRO N7 580W. This 2.9 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The LONGi Hi-MO 6 580W measures 2278×1134×35mm and weighs 28.4 kg, while the Astronergy ASTRO N7 580W measures 2278×1134×35mm at 28.5 kg. 2.58 m² of panel area for the LONGi Hi-MO 6 580W versus 2.58 m² for the Astronergy ASTRO N7 580W. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | LONGi Hi-MO 6 580W | Astronergy ASTRO N7 580W |
|---|---|---|
| Power | 580W | 580W |
| Efficiency | 22.3% | 22.4% |
| Power Density | 20.9 W/sq ft | 20.9 W/sq ft |
| Cell Type | PERC Mono Half-cut | TOPCon N-type |
| Bifacial | No | Yes |
| Weight | 28.4 kg | 28.5 kg |
| Temp Coefficient | -0.34%/°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) | 1.5% | 1% |
| Annual Degradation | 0.5% | 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 22.3% — a 0.1 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.0 kW more total system capacity, or 0 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 -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Astronergy ASTRO N7 580WAstronergy ASTRO N7 580W leads with a 15-year product warranty versus 12 years. Astronergy ASTRO N7 580W degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 86.5% vs 89.4% of original output for LONGi Hi-MO 6 580W and Astronergy ASTRO N7 580W respectively.
4. Power Output
Winner: TieBoth panels deliver 580W — identical power output per panel. System cost per watt will be the deciding factor.
5. Cell Technology
Winner: Astronergy ASTRO N7 580WThe LONGi Hi-MO 6 580W uses PERC Mono Half-cut: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The 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. TOPCon N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
Technical Deep Dive
At 580W, both panels target the commercial rooftop and ground-mount market segment. The LONGi Hi-MO 6 achieves its 580W/22.3% efficiency with PERC Mono technology — LONGi's optimized version of the industry's most widely deployed cell architecture. Astronergy's ASTRO N7 reaches 580W/22.4% with TOPCon, the newer n-type technology that is rapidly replacing PERC as the industry standard. The critical difference at commercial scale is degradation. PERC panels typically degrade 2% in the first year and 0.45-0.55% annually thereafter, while TOPCon degrades approximately 1% in the first year and 0.4% annually. For a 1 MW commercial installation, this degradation difference means the TOPCon system produces approximately 50-70 MWh more energy over 25 years — worth $7,500-$10,500 at commercial electricity rates. Astronergy, while less well-known than LONGi in the US residential market, is a significant global player as a subsidiary of Chint Group, one of China's largest electrical equipment conglomerates. Their ASTRO N7 platform has seen strong adoption in utility-scale and commercial projects worldwide. LONGi's Hi-MO 6 PERC line, while based on older technology, benefits from LONGi's unmatched manufacturing precision and quality control systems developed over decades of PERC production.
LONGi Hi-MO 6 580W
LONGi Hi-MO 6 is a high-performance PERC mono half-cut panel delivering 580W with 22.3% efficiency, ideal for residential and commercial rooftops.
Pros
- + High 22.3% efficiency
- + Proven PERC technology
- + Strong bifacial gain potential
- + Competitive pricing
Cons
- - Large physical size
- - Requires compatible racking
- - Limited US availability
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 6 580W If...
- ✓ LONGi Hi-MO 6 pricing is significantly better — LONGi's massive production scale often enables aggressive pricing
- ✓ You prefer LONGi's brand recognition as the world's largest solar manufacturer by module shipments
- ✓ Your installer has an established LONGi supply chain with reliable inventory and competitive pricing
- ✓ Your project timeline requires immediate panel availability and LONGi has stock ready
Choose Astronergy ASTRO N7 580W If...
- ✓ You want n-type TOPCon technology with lower long-term degradation than PERC
- ✓ Astronergy (a subsidiary of Chint Group) offers competitive pricing in your market
- ✓ Your project values performance over 25-30 years where TOPCon's degradation advantage accumulates
- ✓ You want to invest in current-generation cell technology rather than last-generation PERC
Our Recommendation
The Astronergy ASTRO N7 580W is the decisive winner in this solar panel comparison, outperforming the LONGi Hi-MO 6 580W in 4 of 5 dimensions. Unless you have a specific requirement that the LONGi Hi-MO 6 580W uniquely addresses, the Astronergy ASTRO N7 580W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Is Astronergy a reliable brand for a 25-year solar investment?
Astronergy is a subsidiary of Chint Group, a Chinese conglomerate with $15+ billion annual revenue across electrical equipment, solar, and automation. Astronergy has shipped over 50 GW of solar panels globally and is a Bloomberg Tier 1 manufacturer, meaning their panels are accepted by major project finance institutions. While less recognized in the US residential market than LONGi, their commercial and utility-scale track record is strong.
Why does LONGi still sell PERC panels when TOPCon exists?
LONGi invested billions in PERC production capacity and continues to run those lines while transitioning to TOPCon and HPBC. PERC panels remain cost-effective to produce and satisfy market demand for budget-oriented projects. LONGi sells PERC (Hi-MO 6) alongside TOPCon (Hi-MO X6) and HPBC (Hi-MO 7), letting buyers choose their preferred price-performance point. PERC lines will gradually be converted or retired as TOPCon becomes the cost baseline.
Which is better, LONGi Hi-MO 6 580W or Astronergy ASTRO N7 580W?
The Astronergy ASTRO N7 580W wins with 22.4% TOPCon efficiency versus LONGi Hi-MO 6's 22.3% using PERC technology. Like the Tiger Neo vs Hi-MO 6 comparison, the key advantage is TOPCon's inherently superior degradation profile and temperature performance over PERC, not just the 0.1% efficiency difference.
Which panel is more efficient, LONGi Hi-MO 6 580W 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 0.1 percentage points translates to approximately 0W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO 6 580W or Astronergy ASTRO N7 580W?
The LONGi Hi-MO 6 580W 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 6 580W has a temperature coefficient of -0.34%/°C and the Astronergy ASTRO N7 580W is -0.29%/°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 LONGi Hi-MO 6 580W vs Astronergy ASTRO N7 580W panels do I need for an 8 kW system?
For an 8 kW system: you need 14 LONGi Hi-MO 6 580W panels (580W each) or 14 Astronergy ASTRO N7 580W panels (580W each). Both require the same number of panels.
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Last updated: February 2026