Silfab SIL-410-BG 410W Specifications & Review
The SIL-410-BG is Silfab's all-black residential PERC panel offering 410W with US manufacturing and a 25-year warranty.
What Makes the Silfab SIL-410-BG 410W Different
The Silfab SIL-410-BG 410W is manufactured in North America by Silfab Solar, making it one of the few solar panels that qualifies as FEOC-compliant (Foreign Entity of Concern free) under the Inflation Reduction Act. This means the SIL-410-BG 410W qualifies for the full 30% ITC plus potential domestic content bonus credits, which can push total incentives to 40-50%. Silfab operates manufacturing facilities in the state of Washington and Ontario, Canada, using automated production lines that meet rigorous quality standards. At 410W and 21.2% efficiency with 108 PERC Mono cells, the panel delivers strong performance. The 1722×1134mm footprint at 21 kg is designed for residential rooftops. Silfab's 25-year product and 30-year performance warranty with 0.4% annual degradation provide competitive coverage from a domestic manufacturer.
Key Specifications
| Brand | Silfab |
| Model | Silfab SIL-410-BG 410W |
| Power Output | 410W |
| Efficiency | 21.2% |
| Power Density | 19.5 W/sq ft |
| Cell Type | PERC Mono |
| Cell Count | 108 cells |
| Dimensions | 1722 x 1134 x 30 mm |
| Weight | 21 kg |
| Open Circuit Voltage (Voc) | 40.5V |
| Max Power Voltage (Vmp) | 33.5V |
| Short Circuit Current (Isc) | 13.22A |
| Max Power Current (Imp) | 12.24A |
| Temp Coefficient (Pmax) | -0.34%/°C |
| Product Warranty | 25 years |
| Performance Warranty | 30 years |
| First Year Degradation | 1% |
| Annual Degradation | 0.4% |
| Country of Manufacture | United States |
| Certifications | IEC 61215, IEC 61730, UL 1703 |
| Snow Load | 5400 Pa (112.8 psf) — Heavy Snow Rated |
| Wind Load | 2400 Pa (50.1 psf) |
Pros & Cons
Pros
- ✓ US manufactured
- ✓ All-black aesthetics
- ✓ 25-year warranty
- ✓ ARRA compliant
Cons
- ✗ Standard PERC efficiency
- ✗ Higher cost per watt
- ✗ Limited model range
Best For
Homeowners wanting US-made, all-black panels with Buy America compliance.
Is the Silfab SIL-410-BG 410W Worth It?
The Silfab SIL-410-BG 410W delivers 410W of power at 21.2% module efficiency, which is above the current industry average of approximately 21%. This higher efficiency means you need fewer panels to reach your target system size, saving roof space and potentially reducing mounting hardware costs.
From a warranty perspective, the SIL-410-BG 410W comes with a industry-leading 25-year product warranty and a 30-year performance guarantee. The industry standard for product warranties ranges from 12 to 25 years, so this panel sits at the top of that range, giving you long-term peace of mind. At the end of 30 years, the panel is guaranteed to still produce approximately 87.4% of its rated output, with first-year degradation of 1% and just 0.4% per year after that.
Pricing varies by region and installer, but the SIL-410-BG 410W's combination of 21.2% efficiency and 25-year warranty should be weighed against per-watt quotes from your installer. Request at least three quotes to ensure you are getting competitive pricing for this tier of panel.
For hot climates, the temperature coefficient of -0.34%/°C is good. This falls within the typical range, so you can expect reasonable performance in most climates, though premium panels with coefficients closer to -0.25%/°C will edge ahead in extreme heat. Overall, the Silfab SIL-410-BG 410W represents a strong value proposition for most residential installations.
Real-World Performance
In real-world conditions, the Silfab SIL-410-BG 410W delivers consistent energy production shaped by its -0.34%/°C temperature coefficient. On a hot summer day when panel surface temperatures reach 65°C (40°C above STC), the SIL-410-BG 410W loses approximately 13.6% of rated output — typical for PERC technology. Over a full year in a typical US location, expect annual specific yield of 1,400-1,700 kWh per kW installed, depending on location, tilt, and shading. The 1% first-year degradation settles into 0.4% annual degradation thereafter; after 25 years the SIL-410-BG 410W should still produce approximately 89.4% of its original rating. The 108 half-cut cells provide improved shade tolerance compared to full-cell designs — when one cell is shaded, only one sub-string is affected rather than an entire string, limiting production losses to approximately one-third of the panel rather than one-half.
Who Should Buy the Silfab SIL-410-BG 410W?
System Design Tips
For string inverter systems, the Silfab SIL-410-BG 410W's Voc of 40.5V allows up to 14 panels per string on a 600V inverter, or 11 panels per string on 480V systems. The Isc of 13.22A is within the input range of all major residential string inverters and microinverters. For microinverter pairing, the Enphase IQ8A (366VA) or IQ8H (384VA) handles the 410W output well with a DC/AC ratio of 1.1-1.1. SolarEdge P505 optimizers pair well for optimizer-based systems. Size your inverter at 75-90% of total DC wattage for optimal clipping management — for a 25-panel array (10.3 kW DC), a 8 W AC inverter is a good match. The panel handles 5400 Pa snow load and 2400 Pa wind load.
Price Estimate
The Silfab SIL-410-BG 410W is sold through residential solar distributors and installers. Silfab pricing varies by distributor and order volume. For a 25-panel system (10.3 kW DC), total installed cost including panels, inverter, racking, wiring, permitting, and labor typically runs $2.50-3.50/W, or approximately $30,750-$35,875 before the 30% federal ITC. After ITC: approximately $21,525-$25,113. Domestic content bonus credits under IRA may reduce costs further.
How the Silfab SIL-410-BG 410W Compares
| Model | Wattage | Efficiency | W/sq ft | Warranty | Snow Load | Cell Type |
|---|---|---|---|---|---|---|
| Silfab SIL-410-BG 410W (this panel) | 410W | 21.2% | 19.5 | 25 yrs | 5400 Pa | PERC Mono |
| Maxeon Maxeon 3 410W | 410W | 22.2% | 20.7 | 25 yrs | 5400 Pa | IBC (Interdigitated Back Contact) |
| Panasonic EverVolt H 410W | 410W | 21.6% | 19.5 | 25 yrs | 5400 Pa | HJT (Heterojunction) |
| Panasonic EverVolt 410 | 410W | 21.5% | 19.5 | 25 yrs | 5400 Pa | HJT (Heterojunction) |
Compare This Panel
Installation & Compatibility
System Voltage & String Sizing
- Open Circuit Voltage (Voc)
- 40.5V
- Max Power Voltage (Vmp)
- 33.5V
- Short Circuit Current (Isc)
- 13.22A
- Max Power Current (Imp)
- 12.24A
- Max Panels per String (600V)
- 14 panels
Based on NEC 600V residential limit. Actual string sizing should account for cold-temperature Voc rise. Consult your installer or use a string sizing tool for your specific location.
Mounting Requirements
- Dimensions
- 1722 x 1134 x 30 mm
- Weight
- 21 kg (46.3 lbs)
- Area per Panel
- 21.0 sq ft
- Weight per sq ft
- 2.2 lbs/sq ft
Recommended Inverter Types
- - Microinverters: Ideal for shaded roofs or complex layouts. Match to panels rated 410W+.
- - String Inverters: Cost-effective for unshaded arrays. Ensure MPPT range covers 33.5V.
- - Hybrid Inverters: Best if adding battery storage. Check DC input specs match panel Voc of 40.5V.
Frequently Asked Questions
How efficient is the Silfab SIL-410-BG 410W compared to other panels?
The SIL-410-BG 410W achieves 21.2% module efficiency, which is competitive for PERC residential panels. PERC panels typically range from 20.0% to 21.8%, and the SIL-410-BG 410W performs competitively within that range. Higher efficiency means more watts per square foot of roof space.
What is the warranty on the Silfab SIL-410-BG 410W?
Silfab provides a 25-year product warranty covering manufacturing defects and a 30-year performance warranty guaranteeing output levels. The performance warranty typically starts at 99% after year 1 and degrades by 0.4% per year, guaranteeing approximately 89.4% output at year 25. The extended product warranty coverage exceeds the industry standard of 10-12 years.
How many Silfab SIL-410-BG 410W panels do I need for my home?
For a typical US home using 10,000 kWh per year, you need approximately 25 panels (10.3 kW system) assuming 4-5 peak sun hours per day. This varies significantly by location — homes in Arizona may need 22-24 panels while homes in the Pacific Northwest may need 27-29 panels. Your installer will calculate the exact number based on your utility bills, roof orientation, shading, and local solar resource.
What is the efficiency of the Silfab SIL-410-BG 410W?
The Silfab SIL-410-BG 410W achieves 21.2% module efficiency using PERC Mono cell technology. This is around the industry average for residential solar panels in 2026.
What warranty does the Silfab SIL-410-BG 410W include?
It comes with a 25-year product warranty and a 30-year performance warranty guaranteeing output at approximately 87.4% of rated power at the end of the warranty period.
How does the Silfab SIL-410-BG 410W perform in hot weather?
With a temperature coefficient of -0.34%/°C, the SIL-410-BG 410W experiences moderate power reduction in high temperatures. Every degree above 25°C reduces output by 0.34%.
What size system can I build with the Silfab SIL-410-BG 410W?
At 410W per panel, you would need approximately 20 panels for an 8 kW system or 25 panels for a 10 kW system. Each panel measures 1722 x 1134 mm (21.0 sq ft).
What inverter is best with the Silfab SIL-410-BG 410W?
The Silfab SIL-410-BG 410W works well with both string inverters and microinverters. For string inverters, choose one with a maximum input voltage above 40.5V and an MPPT voltage range that covers 33.5V. Microinverters rated for 410W+ panels are also an excellent choice, offering panel-level monitoring and shade tolerance. Popular options include Enphase IQ8 series microinverters and SolarEdge string inverters with power optimizers.
How long will the Silfab SIL-410-BG 410W last?
The Silfab SIL-410-BG 410W is built to last well beyond its 30-year performance warranty. With first-year degradation of 1% and annual degradation of 0.4% thereafter, the panel will still produce approximately 87.4% of its rated power after 30 years. Most modern solar panels continue generating useful power for 30-40 years, though output gradually decreases over time.
Is the Silfab SIL-410-BG 410W good for Arizona and other sunny states?
The Silfab SIL-410-BG 410W can work in hot states like Arizona, Nevada, and Texas, though its temperature coefficient of -0.34%/°C means it will lose some output on the hottest days. Consider panels with a lower (closer to 0) temperature coefficient if you live in an area with extreme heat. Higher sun exposure in these states means more total energy production throughout the year, often offsetting any heat-related losses.
Is the Silfab SIL-410-BG 410W worth the money?
The Silfab SIL-410-BG 410W delivers 21.2% efficiency, which is above the industry average of ~21%. Combined with a industry-leading 25-year product warranty and 30-year performance guarantee, it offers strong value for homeowners seeking reliable solar generation.
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Last updated: February 2026