Panasonic EverVolt 410 vs Heliene 108M10 420W
The Panasonic EverVolt 410 wins this comparison by a clear margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Key Differences
- • Panasonic EverVolt 410 is rated at 410W while Heliene 108M10 420W is rated at 420W, a 10W difference.
- • Both achieve identical 21.5% module efficiency.
- • Both carry matching 25-year product warranties.
- • Panasonic EverVolt 410 has a superior temperature coefficient of -0.26%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Panasonic EverVolt 410 uses HJT (Heterojunction) cells while Heliene 108M10 420W uses Mono PERC Half-cut cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
Both the Panasonic EverVolt 410 and Heliene 108M10 420W share identical 21.5% module efficiency, producing comparable power per unit area. The Panasonic EverVolt 410 generates 210.0 W/m² while the Heliene 108M10 420W generates 215.1 W/m² based on their respective panel dimensions. With matched efficiency, neither panel holds a density advantage for space-constrained rooftop installations, so other factors like warranty coverage and temperature performance become the deciding metrics.
Power Output
The Heliene 108M10 420W delivers 420W per panel versus 410W for the Panasonic EverVolt 410, a 10W difference per module. To build an 8 kW residential system, you would need 20 Panasonic EverVolt 410 panels or 20 Heliene 108M10 420W panels. Despite the per-panel wattage difference, both require the same number of panels for this system size due to rounding. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Panasonic EverVolt 410 has a temperature coefficient of -0.26%/°C versus -0.34%/°C for the Heliene 108M10 420W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Panasonic EverVolt 410 retains 94.8% 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 Panasonic EverVolt 410 is backed by a 25-year product warranty and 25-year performance guarantee, while the Heliene 108M10 420W offers 25-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (0.5% first year then 0.35%/year for Panasonic EverVolt 410; 1.5% first year then 0.5%/year for Heliene 108M10 420W), after 25 years the Panasonic EverVolt 410 should retain approximately 91.1% of original output versus 86.5% for the Heliene 108M10 420W. This 4.6 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Panasonic EverVolt 410 measures 1722×1134×30mm and weighs 21.5 kg, while the Heliene 108M10 420W measures 1722×1134×30mm at 21.5 kg. 1.95 m² of panel area for the Panasonic EverVolt 410 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 | Panasonic EverVolt 410 | Heliene 108M10 420W |
|---|---|---|
| Power | 410W | 420W |
| Efficiency | 21.5% | 21.5% |
| Power Density | 19.5 W/sq ft | 20.0 W/sq ft |
| Cell Type | HJT (Heterojunction) | Mono PERC Half-cut |
| Bifacial | Yes | No |
| Weight | 21.5 kg | 21.5 kg |
| Temp Coefficient | -0.26%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 0.5% | 1.5% |
| Annual Degradation | 0.35% | 0.5% |
| Country | Japan | Canada |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: TieBoth panels achieve 21.5% module efficiency, producing identical power per square meter. Neither has an advantage in space-constrained installations.
2. Hot Climate Performance
Winner: Panasonic EverVolt 410The Panasonic EverVolt 410 has a better temperature coefficient of -0.26%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Panasonic EverVolt 410Panasonic EverVolt 410 degrades more slowly at 0.35% per year versus 0.5%. After 25 years, expect 91.1% vs 86.5% of original output for Panasonic EverVolt 410 and Heliene 108M10 420W respectively.
4. Power Output
Winner: Heliene 108M10 420WThe Heliene 108M10 420W delivers 420W versus 410W per panel — 10W more. For an 8 kW system, you need 20 panels with the higher-wattage option versus 20 panels, saving 0 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Panasonic EverVolt 410The Panasonic EverVolt 410 uses HJT (Heterojunction): HJT (Heterojunction) combines crystalline silicon with amorphous silicon layers, delivering the best temperature coefficient and bifacial gains, but at higher 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. HJT (Heterojunction) represents a newer generation technology with a longer performance runway as manufacturing matures.
Panasonic EverVolt 410
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EverVolt 410 offered Panasonic's HJT technology at a slightly more accessible price point while maintaining premium quality.
Pros
- + Panasonic brand quality
- + HJT cell technology
- + Good temperature performance
- + 25-year warranty
Cons
- - DISCONTINUED - no longer manufactured
- - No new units available
- - No ongoing product support
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 Panasonic EverVolt 410 If...
- ✓ 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
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ No longer available for new installations.
Choose Heliene 108M10 420W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Budget-conscious homeowners who want North American-made panels for domestic content ITC bonus without paying the HJT premium.
Our Recommendation
We recommend the Panasonic EverVolt 410 for most buyers in this comparison. It wins 3 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Heliene 108M10 420W remains a good product, but the Panasonic EverVolt 410 delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Panasonic EverVolt 410 or Heliene 108M10 420W?
The Panasonic EverVolt 410 wins this comparison by a clear margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Which panel is more efficient, Panasonic EverVolt 410 or Heliene 108M10 420W?
The both panels share 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 0.0 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, Panasonic EverVolt 410 or Heliene 108M10 420W?
The Panasonic EverVolt 410 comes with a 25-year product warranty and 25-year performance guarantee. The Heliene 108M10 420W offers 25-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Panasonic EverVolt 410 has a temperature coefficient of -0.26%/°C and the Heliene 108M10 420W is -0.34%/°C. Panasonic EverVolt 410 retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Panasonic EverVolt 410 vs Heliene 108M10 420W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Panasonic EverVolt 410 panels (410W each) or 20 Heliene 108M10 420W panels (420W each). The Heliene 108M10 420W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026