Panasonic EverVolt 410 vs Silfab SIL-410-BG 410W
The Panasonic EverVolt 410 wins this comparison by a clear margin. It leads in efficiency (21.5% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Key Differences
- • Both panels are rated at 410W, so the comparison comes down to efficiency, warranty, and technology.
- • Panasonic EverVolt 410 achieves 21.5% efficiency vs 21.2% for the other, a 0.3 percentage point gap.
- • 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 Silfab SIL-410-BG 410W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Panasonic EverVolt 410 achieves 21.5% module efficiency compared to Silfab SIL-410-BG 410W's 21.2%, meaning Panasonic EverVolt 410 converts 0.3 percentage points more sunlight into electricity per square meter. In practical terms, the Panasonic EverVolt 410 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 410 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 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 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 410; 1% first year then 0.4%/year for Silfab SIL-410-BG 410W), after 25 years the Panasonic EverVolt 410 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 410 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 410 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 410 | Silfab SIL-410-BG 410W |
|---|---|---|
| Power | 410W | 410W |
| Efficiency | 21.5% | 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 410The Panasonic EverVolt 410 achieves 21.5% efficiency versus 21.2% — a 0.3 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 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 0.4%. After 25 years, expect 91.1% vs 89.4% of original output for Panasonic EverVolt 410 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 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 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 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
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 410 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 410 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 410 delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Panasonic EverVolt 410 or Silfab SIL-410-BG 410W?
The Panasonic EverVolt 410 wins this comparison by a clear margin. It leads in efficiency (21.5% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Which panel is more efficient, Panasonic EverVolt 410 or Silfab SIL-410-BG 410W?
The Panasonic EverVolt 410 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 0.3 percentage points translates to approximately 0W per panel under standard test conditions.
Which has a better warranty, Panasonic EverVolt 410 or Silfab SIL-410-BG 410W?
The Panasonic EverVolt 410 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 410 has a temperature coefficient of -0.26%/°C and the Silfab SIL-410-BG 410W 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 Silfab SIL-410-BG 410W 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 Silfab SIL-410-BG 410W panels (410W each). Both require the same number of panels.
Related Resources
Last updated: February 2026