Silfab Solar — US/Canada
SIL-40 HD
The Silfab Solar SIL-40 HD is a 405W PERC solar panel with 20.3% efficiency. Backed by a 25-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus Eligible
405W
Wattage
20.3%
Efficiency
PERC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Silfab Solar
- Model
- SIL-40 HD
- Series
- SIL
- Wattage
- 405W
- Module Efficiency
- 20.3%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.84
- Est. 7kW System Cost
- $19,880
- Est. 10kW System Cost
- $28,400
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- No
- 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 445W D Plus | 445W | 21.7% | N-Type TOPCon | $3.26 |
| SIL 440W C | 440W | 21.5% | PERC | $3.20 |
| SIL 440W A Ultra | 440W | 21.5% | N-Type TOPCon | $3.20 |
| SIL 435W E Max | 435W | 21.3% | PERC | $3.14 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| SunPower Maxeon 435W A Ultra | 435W | 22.7% | $4.42 |
| Maxeon 3 435W E Max | 435W | 22.7% | $4.29 |
| SunPower Maxeon 430W E Max | 430W | 22.6% | $4.38 |
| SunPower Maxeon 430W C Black | 430W | 22.6% | $4.38 |
Frequently Asked Questions
How much does a 405W Silfab Solar SIL-40 HD cost?
The Silfab Solar SIL-40 HD costs approximately $1150 per panel ($$2.84/W). A typical 7kW system using this panel would cost around $19,880 before incentives.
⚠ The 30% federal solar tax credit has ended — Section 25D expired December 31, 2025, and the Section 48E construction-start deadline passed 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-40 HD a good solar panel?
The Silfab Solar SIL-40 HD has 20.3% 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-40 HD panels do I need?
For a typical 7kW residential system, you'd need approximately 18 panels. For a 10kW system, plan for about 25 panels. The exact number depends on your roof space, energy usage, and local sun hours.