Panasonic EverVolt 410 vs Silfab SIL-370-BK 370W
The Panasonic EverVolt 410 wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 20.4%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Key Differences
- • Panasonic EverVolt 410 is rated at 410W while Silfab SIL-370-BK 370W is rated at 370W, a 40W difference.
- • Panasonic EverVolt 410 achieves 21.5% efficiency vs 20.4% for the other, a 1.1 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Panasonic EverVolt 410 has a superior temperature coefficient of -0.26%/°C vs -0.35%/°C, retaining more power in hot climates.
- • Panasonic EverVolt 410 uses HJT (Heterojunction) cells while Silfab SIL-370-BK 370W 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-370-BK 370W's 20.4%, meaning Panasonic EverVolt 410 converts 1.1 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-370-BK 370W produces 189.5 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
The Panasonic EverVolt 410 delivers 410W per panel versus 370W for the Silfab SIL-370-BK 370W, a 40W difference per module. To build an 8 kW residential system, you would need 20 Panasonic EverVolt 410 panels or 22 Silfab SIL-370-BK 370W 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
The Panasonic EverVolt 410 has a temperature coefficient of -0.26%/°C versus -0.35%/°C for the Silfab SIL-370-BK 370W. 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 93.0%. 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-370-BK 370W 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% first year then 0.4%/year for Silfab SIL-370-BK 370W), after 25 years the Panasonic EverVolt 410 should retain approximately 91.1% of original output versus 89.4% for the Silfab SIL-370-BK 370W. 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-370-BK 370W measures 1722×1134×30mm at 19.5 kg. 1.95 m² of panel area for the Panasonic EverVolt 410 versus 1.95 m² for the Silfab SIL-370-BK 370W. The Silfab SIL-370-BK 370W is 2.0 kg lighter per panel, which reduces structural load requirements on the roof and makes handling easier during installation. For a 20-panel system, that is a total weight difference of 40 kg. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Panasonic EverVolt 410 | Silfab SIL-370-BK 370W |
|---|---|---|
| Power | 410W | 370W |
| Efficiency | 21.5% | 20.4% |
| Power Density | 19.5 W/sq ft | 17.6 W/sq ft |
| Cell Type | HJT (Heterojunction) | PERC Mono |
| Bifacial | Yes | No |
| Weight | 21.5 kg | 19.5 kg |
| Temp Coefficient | -0.26%/°C | -0.35%/°C |
| Snow Load | 5400 Pa | 2400 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% |
| 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 20.4% — a 1.1 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: Panasonic EverVolt 410The Panasonic EverVolt 410 has a better temperature coefficient of -0.26%/°C versus -0.35%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 93.0%. 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-370-BK 370W respectively.
4. Power Output
Winner: Panasonic EverVolt 410The Panasonic EverVolt 410 delivers 410W versus 370W per panel — 40W more. For an 8 kW system, you need 20 panels with the higher-wattage option versus 22 panels, saving 2 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 Silfab SIL-370-BK 370W 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-370-BK 370W
The SIL-370-BK is Silfab's entry-level US-made all-black panel delivering 370W for budget-conscious domestic installations.
Pros
- + Made in USA
- + All-black design
- + 25-year warranty
- + ARRA compliant
Cons
- - Lower wattage
- - Basic PERC technology
- - Less competitive efficiency
Choose Panasonic EverVolt 410 If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ 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
Choose Silfab SIL-370-BK 370W If...
- ✓ Government or institutional projects requiring ARRA/Buy America compliance.
Our Recommendation
The Panasonic EverVolt 410 is the decisive winner in this solar panel comparison, outperforming the Silfab SIL-370-BK 370W in 5 of 5 dimensions. Unless you have a specific requirement that the Silfab SIL-370-BK 370W uniquely addresses, the Panasonic EverVolt 410 is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Panasonic EverVolt 410 or Silfab SIL-370-BK 370W?
The Panasonic EverVolt 410 wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 20.4%) 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-370-BK 370W?
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 1.1 percentage points translates to approximately 40W per panel under standard test conditions.
Which has a better warranty, Panasonic EverVolt 410 or Silfab SIL-370-BK 370W?
The Panasonic EverVolt 410 comes with a 25-year product warranty and 25-year performance guarantee. The Silfab SIL-370-BK 370W 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 Silfab SIL-370-BK 370W is -0.35%/°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-370-BK 370W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Panasonic EverVolt 410 panels (410W each) or 22 Silfab SIL-370-BK 370W panels (370W each). The Panasonic EverVolt 410 requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026