Panasonic EverVolt H 410W vs Silfab SIL-410-BG 410W
The Panasonic EverVolt H 410W wins this comparison by a clear margin. It leads in efficiency (21.6% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt H 410W is the stronger choice.
Key Differences
- • Both panels are rated at 410W, so the comparison comes down to efficiency, warranty, and technology.
- • Panasonic EverVolt H 410W achieves 21.6% efficiency vs 21.2% for the other, a 0.4 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Panasonic EverVolt H 410W has a superior temperature coefficient of -0.26%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Panasonic EverVolt H 410W uses HJT (Heterojunction) cells while Silfab SIL-410-BG 410W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Panasonic EverVolt H 410W achieves 21.6% module efficiency compared to Silfab SIL-410-BG 410W's 21.2%, meaning Panasonic EverVolt H 410W converts 0.4 percentage points more sunlight into electricity per square meter. In practical terms, the Panasonic EverVolt H 410W produces 210.0 watts per square meter of panel area while the Silfab SIL-410-BG 410W produces 210.0 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 410W under standard test conditions (STC), requiring 20 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 Panasonic EverVolt H 410W has a temperature coefficient of -0.26%/°C versus -0.34%/°C for the Silfab SIL-410-BG 410W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Panasonic EverVolt H 410W 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 H 410W is backed by a 25-year product warranty and 25-year performance guarantee, while the Silfab SIL-410-BG 410W offers 25-year product and 30-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 H 410W; 1% first year then 0.4%/year for Silfab SIL-410-BG 410W), after 25 years the Panasonic EverVolt H 410W should retain approximately 91.1% of original output versus 89.4% for the Silfab SIL-410-BG 410W. This 1.7 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Panasonic EverVolt H 410W measures 1722×1134×30mm and weighs 21.5 kg, while the Silfab SIL-410-BG 410W measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Panasonic EverVolt H 410W versus 1.95 m² for the Silfab SIL-410-BG 410W. 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 H 410W | Silfab SIL-410-BG 410W |
|---|---|---|
| Power | 410W | 410W |
| Efficiency | 21.6% | 21.2% |
| Power Density | 19.5 W/sq ft | 19.5 W/sq ft |
| Cell Type | HJT (Heterojunction) | PERC Mono |
| Bifacial | Yes | No |
| Weight | 21.5 kg | 21 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 | 30 years |
| Degradation (Year 1) | 0.5% | 1% |
| Annual Degradation | 0.35% | 0.4% |
| Country | Japan | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Panasonic EverVolt H 410WThe Panasonic EverVolt H 410W achieves 21.6% efficiency versus 21.2% — a 0.4 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: Panasonic EverVolt H 410WThe Panasonic EverVolt H 410W 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 H 410WPanasonic EverVolt H 410W degrades more slowly at 0.35% per year versus 0.4%. After 25 years, expect 91.1% vs 89.4% of original output for Panasonic EverVolt H 410W and Silfab SIL-410-BG 410W respectively.
4. Power Output
Winner: TieBoth panels deliver 410W — identical power output per panel. System cost per watt will be the deciding factor.
5. Cell Technology
Winner: Panasonic EverVolt H 410WThe Panasonic EverVolt H 410W 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 Silfab SIL-410-BG 410W uses PERC Mono: 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 H 410W
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EverVolt H delivered 410W HJT performance in a compact residential format backed by Panasonic's 25-year complete warranty.
Pros
- + 25-year product warranty
- + HJT technology
- + Excellent temperature performance
- + Compact design
Cons
- - DISCONTINUED - no longer manufactured
- - No new units available
- - No ongoing product support
Silfab SIL-410-BG 410W
The SIL-410-BG is Silfab's all-black residential PERC panel offering 410W with US manufacturing and a 25-year warranty.
Pros
- + US manufactured
- + All-black aesthetics
- + 25-year warranty
- + ARRA compliant
Cons
- - Standard PERC efficiency
- - Higher cost per watt
- - Limited model range
Choose Panasonic EverVolt H 410W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ 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 Silfab SIL-410-BG 410W If...
- ✓ Homeowners wanting US-made, all-black panels with Buy America compliance.
Our Recommendation
We recommend the Panasonic EverVolt H 410W for most buyers in this comparison. It wins 4 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Silfab SIL-410-BG 410W remains a good product, but the Panasonic EverVolt H 410W delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Panasonic EverVolt H 410W or Silfab SIL-410-BG 410W?
The Panasonic EverVolt H 410W wins this comparison by a clear margin. It leads in efficiency (21.6% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt H 410W is the stronger choice.
Which panel is more efficient, Panasonic EverVolt H 410W or Silfab SIL-410-BG 410W?
The Panasonic EverVolt H 410W at 21.6% 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 0W per panel under standard test conditions.
Which has a better warranty, Panasonic EverVolt H 410W or Silfab SIL-410-BG 410W?
The Panasonic EverVolt H 410W comes with a 25-year product warranty and 25-year performance guarantee. The Silfab SIL-410-BG 410W offers 25-year product and 30-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Panasonic EverVolt H 410W has a temperature coefficient of -0.26%/°C and the Silfab SIL-410-BG 410W is -0.34%/°C. Panasonic EverVolt H 410W 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 H 410W vs Silfab SIL-410-BG 410W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Panasonic EverVolt H 410W panels (410W each) or 20 Silfab SIL-410-BG 410W panels (410W each). Both require the same number of panels.
Related Resources
Last updated: February 2026