Astronergy ASTRO N5 460W vs Heliene 108M10 420W
The Heliene 108M10 420W wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 21.3%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Heliene 108M10 420W is the stronger choice.
Key Differences
- • Astronergy ASTRO N5 460W is rated at 460W while Heliene 108M10 420W is rated at 420W, a 40W difference.
- • Heliene 108M10 420W achieves 21.5% efficiency vs 21.3% for the other, a 0.2 percentage point gap.
- • Heliene 108M10 420W comes with a 25-year product warranty vs 12 years for the other.
- • Astronergy ASTRO N5 460W uses PERC Mono cells while Heliene 108M10 420W uses Mono PERC Half-cut cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Heliene 108M10 420W achieves 21.5% module efficiency compared to Astronergy ASTRO N5 460W's 21.3%, meaning Heliene 108M10 420W converts 0.2 percentage points more sunlight into electricity per square meter. In practical terms, the Astronergy ASTRO N5 460W produces 230.2 watts per square meter of panel area while the Heliene 108M10 420W 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 N5 460W delivers 460W per panel versus 420W for the Heliene 108M10 420W, a 40W difference per module. To build an 8 kW residential system, you would need 18 Astronergy ASTRO N5 460W panels or 20 Heliene 108M10 420W panels. Choosing the higher-wattage option saves 2 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 -0.34%/°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 93.2% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Astronergy ASTRO N5 460W is backed by a 12-year product warranty and 25-year performance guarantee, while the Heliene 108M10 420W offers 25-year product and 25-year performance coverage. The Heliene 108M10 420W provides 13 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 Astronergy ASTRO N5 460W; 1.5% first year then 0.5%/year for Heliene 108M10 420W), after 25 years the Astronergy ASTRO N5 460W should retain approximately 86.5% of original output versus 86.5% for the Heliene 108M10 420W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Astronergy ASTRO N5 460W measures 1762×1134×30mm and weighs 23 kg, while the Heliene 108M10 420W measures 1722×1134×30mm at 21.5 kg. 2.00 m² of panel area for the Astronergy ASTRO N5 460W versus 1.95 m² for the Heliene 108M10 420W. 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 | Astronergy ASTRO N5 460W | Heliene 108M10 420W |
|---|---|---|
| Power | 460W | 420W |
| Efficiency | 21.3% | 21.5% |
| Power Density | 21.4 W/sq ft | 20.0 W/sq ft |
| Cell Type | PERC Mono | Mono PERC Half-cut |
| Bifacial | Yes | No |
| Weight | 23 kg | 21.5 kg |
| Temp Coefficient | -0.34%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1.5% | 1.5% |
| Annual Degradation | 0.5% | 0.5% |
| Country | China | Canada |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Heliene 108M10 420WThe Heliene 108M10 420W achieves 21.5% efficiency versus 21.3% — a 0.2 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: TieBoth panels share a temperature coefficient of -0.34%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: Heliene 108M10 420WHeliene 108M10 420W leads with a 25-year product warranty versus 12 years. After 25 years, expect 86.5% vs 86.5% of original output for Astronergy ASTRO N5 460W and Heliene 108M10 420W respectively.
4. Power Output
Winner: Astronergy ASTRO N5 460WThe Astronergy ASTRO N5 460W delivers 460W versus 420W per panel — 40W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 20 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe Astronergy ASTRO N5 460W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The Heliene 108M10 420W uses Mono PERC Half-cut: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. Both are equivalent-generation technologies.
Astronergy ASTRO N5 460W
The ASTRO N5 is a mid-range PERC panel delivering 460W for residential and commercial installations at a value price point.
Pros
- + Good value per watt
- + Mid-size format
- + CHINT Group backing
- + Widely available globally
Cons
- - Older PERC technology
- - Standard efficiency
- - Less known in US
Heliene 108M10 420W
The Heliene 108M10 420W is a standard residential-format mono PERC panel manufactured in Heliene's North American facilities (Ontario, Canada and Mountain Iron, Minnesota). The 108 half-cut cell design in the standard 1722 x 1134mm format ensures universal racking compatibility. As one of the few PERC panels made in North America, it offers domestic content ITC bonus eligibility at a more accessible price point than Heliene's HJT line. Backed by Heliene's 25-year product warranty and accessible Canadian/US-based support.
Pros
- + North American manufactured — domestic content ITC bonus eligible
- + Standard 108-cell residential format fits all racking systems
- + More affordable than HJT panels while qualifying for domestic content bonus
- + 25-year product and performance warranties
- + Canadian and US-based customer support
- + 420W competitive output for standard residential size
Cons
- - PERC technology — less efficient than TOPCon/HJT in hot climates
- - -0.34%/°C temp coefficient is standard, not exceptional
- - 420W is competitive but not class-leading
- - Higher cost than Chinese-made PERC panels of similar specs
Choose Astronergy ASTRO N5 460W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Value-oriented projects seeking competitive PERC pricing from a global manufacturer.
Choose Heliene 108M10 420W 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
- ✓ Budget-conscious homeowners who want North American-made panels for domestic content ITC bonus without paying the HJT premium.
Our Recommendation
The Heliene 108M10 420W is the decisive winner in this solar panel comparison, outperforming the Astronergy ASTRO N5 460W in 2 of 5 dimensions. Unless you have a specific requirement that the Astronergy ASTRO N5 460W uniquely addresses, the Heliene 108M10 420W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Astronergy ASTRO N5 460W or Heliene 108M10 420W?
The Heliene 108M10 420W wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 21.3%) and matches or exceeds on warranty (25 vs 12 years). For most residential installations, the Heliene 108M10 420W is the stronger choice.
Which panel is more efficient, Astronergy ASTRO N5 460W or Heliene 108M10 420W?
The Heliene 108M10 420W 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 0.2 percentage points translates to approximately 40W per panel under standard test conditions.
Which has a better warranty, Astronergy ASTRO N5 460W or Heliene 108M10 420W?
The Astronergy ASTRO N5 460W comes with a 12-year product warranty and 25-year performance guarantee. The Heliene 108M10 420W offers 25-year product and 25-year performance warranties. Heliene 108M10 420W provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The Astronergy ASTRO N5 460W has a temperature coefficient of -0.34%/°C and the Heliene 108M10 420W is -0.34%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Astronergy ASTRO N5 460W vs Heliene 108M10 420W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 Astronergy ASTRO N5 460W panels (460W each) or 20 Heliene 108M10 420W panels (420W each). The Astronergy ASTRO N5 460W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026