Silfab Solar — US/Canada
SIL Prime 420W A Black
The Silfab Solar SIL Prime 420W A Black is a 420W N-Type TOPCon solar panel with 20.8% efficiency. Backed by a 25-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus EligibleBifacial
420W
Wattage
20.8%
Efficiency
N-Type TOPCon
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Silfab Solar
- Model
- SIL Prime 420W A Black
- Series
- SIL Prime
- Wattage
- 420W
- Module Efficiency
- 20.8%
- Cell Type
- N-Type TOPCon
- Dimensions
- 66-80" x 39-41"
- Weight
- 48 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.99
- Est. 7kW System Cost
- $20,930
- Est. 10kW System Cost
- $29,900
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- Yes
- Origin
- US/Canada
- FEOC Status
- pass
Other Silfab Solar Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| SIL 455W E Pro | 455W | 22% | PERC | $3.35 |
| SIL-N 455W E Pro | 455W | 22% | PERC | $3.35 |
| SIL Prime 455W E Pro | 455W | 22% | PERC | $3.35 |
| SIL 445W D Plus | 445W | 21.7% | N-Type TOPCon | $3.26 |
| SIL-N 445W D Plus | 445W | 21.7% | N-Type TOPCon | $3.26 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| Maxeon Maxeon 3 450W D Plus | 450W | 23.3% | $4.61 |
| Maxeon Maxeon 6 450W D Plus | 450W | 23.3% | $4.61 |
| Maxeon Maxeon 7 450W D Plus | 450W | 23.3% | $4.61 |
| Maxeon Maxeon Air 450W D Plus | 450W | 23.3% | $4.61 |
Frequently Asked Questions
How much does a 420W Silfab Solar SIL Prime 420W A Black cost?
The Silfab Solar SIL Prime 420W A Black costs approximately $1256 per panel ($$2.99/W). A typical 7kW system using this panel would cost around $20,930 before incentives.
⚠ The 30% Federal Solar Tax Credit (48E/ITC) expired July 4, 2026.
Selecting 30% ITC assumes you began construction before this deadline. Most new purchases no longer qualify.Learn about your options after the deadline →
Is the Silfab Solar SIL Prime 420W A Black a good solar panel?
The Silfab Solar SIL Prime 420W A Black has 20.8% efficiency and a 25 years warranty, placing it in the premium tier. This is a solid mid-range panel suitable for most residential installations. It also qualifies for the domestic content bonus under the Inflation Reduction Act.
How many Silfab Solar SIL Prime 420W A Black panels do I need?
For a typical 7kW residential system, you'd need approximately 17 panels. For a 10kW system, plan for about 24 panels. The exact number depends on your roof space, energy usage, and local sun hours.