Panasonic EVPV400H vs Silfab SIL-410-BG 410W
The Panasonic EVPV400H wins this comparison by a clear margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Panasonic EVPV400H is the stronger choice.
Key Differences
- • Panasonic EVPV400H is rated at 400W while Silfab SIL-410-BG 410W is rated at 410W, a 10W difference.
- • Both achieve identical 21.2% module efficiency.
- • Both carry matching 25-year product warranties.
- • Panasonic EVPV400H has a superior temperature coefficient of -0.26%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Panasonic EVPV400H uses HJT (Heterojunction) cells while Silfab SIL-410-BG 410W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
Both the Panasonic EVPV400H and Silfab SIL-410-BG 410W share identical 21.2% module efficiency, producing comparable power per unit area. The Panasonic EVPV400H generates 204.8 W/m² while the Silfab SIL-410-BG 410W generates 210.0 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 Silfab SIL-410-BG 410W delivers 410W per panel versus 400W for the Panasonic EVPV400H, a 10W difference per module. To build an 8 kW residential system, you would need 20 Panasonic EVPV400H panels or 20 Silfab SIL-410-BG 410W 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 EVPV400H 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 EVPV400H 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 EVPV400H 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 EVPV400H; 1% first year then 0.4%/year for Silfab SIL-410-BG 410W), after 25 years the Panasonic EVPV400H 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 EVPV400H measures 1722×1134×30mm and weighs 21 kg, while the Silfab SIL-410-BG 410W measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Panasonic EVPV400H 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 EVPV400H | Silfab SIL-410-BG 410W |
|---|---|---|
| Power | 400W | 410W |
| Efficiency | 21.2% | 21.2% |
| Power Density | 19.0 W/sq ft | 19.5 W/sq ft |
| Cell Type | HJT (Heterojunction) | PERC Mono |
| Bifacial | Yes | No |
| Weight | 21 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: TieBoth panels achieve 21.2% module efficiency, producing identical power per square meter. Neither has an advantage in space-constrained installations.
2. Hot Climate Performance
Winner: Panasonic EVPV400HThe Panasonic EVPV400H 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 EVPV400HPanasonic EVPV400H 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 EVPV400H and Silfab SIL-410-BG 410W respectively.
4. Power Output
Winner: Silfab SIL-410-BG 410WThe Silfab SIL-410-BG 410W delivers 410W versus 400W 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 EVPV400HThe Panasonic EVPV400H 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 EVPV400H
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EVPV400H was Panasonic's standard HJT residential panel, delivering 400W with the brand's signature quality and longevity.
Pros
- + Panasonic reliability
- + HJT advantages
- + Solid 25-year warranty
- + Good all-round performer
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 EVPV400H 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 Silfab SIL-410-BG 410W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Homeowners wanting US-made, all-black panels with Buy America compliance.
Our Recommendation
We recommend the Panasonic EVPV400H 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 Silfab SIL-410-BG 410W remains a good product, but the Panasonic EVPV400H delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Panasonic EVPV400H or Silfab SIL-410-BG 410W?
The Panasonic EVPV400H wins this comparison by a clear margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Panasonic EVPV400H is the stronger choice.
Which panel is more efficient, Panasonic EVPV400H or Silfab SIL-410-BG 410W?
The both panels share 21.2% 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 EVPV400H or Silfab SIL-410-BG 410W?
The Panasonic EVPV400H 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 EVPV400H has a temperature coefficient of -0.26%/°C and the Silfab SIL-410-BG 410W is -0.34%/°C. Panasonic EVPV400H retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Panasonic EVPV400H vs Silfab SIL-410-BG 410W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Panasonic EVPV400H panels (400W each) or 20 Silfab SIL-410-BG 410W panels (410W each). The Silfab SIL-410-BG 410W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026