Silfab Solar — US/Canada
SIL Prime 385-E Ultra
The Silfab Solar SIL Prime 385-E Ultra is a 385W N-Type TOPCon solar panel with 19.7% efficiency. Backed by a 25-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus EligibleBifacial
385W
Wattage
19.7%
Efficiency
N-Type TOPCon
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Silfab Solar
- Model
- SIL Prime 385-E Ultra
- Series
- SIL Prime
- Wattage
- 385W
- Module Efficiency
- 19.7%
- Cell Type
- N-Type TOPCon
- Dimensions
- 65-67" x 39-40"
- Weight
- 43 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.66
- Est. 7kW System Cost
- $18,620
- Est. 10kW System Cost
- $26,600
- 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 |
|---|---|---|---|
| SunPower Maxeon 415W A Black | 415W | 22% | $4.12 |
| SunPower Maxeon 415W C Plus | 415W | 22% | $4.12 |
| SunPower Maxeon 415W B Ultra | 415W | 22% | $4.12 |
| SunPower Performance 415W A Black | 415W | 22% | $4.12 |
Frequently Asked Questions
How much does a 385W Silfab Solar SIL Prime 385-E Ultra cost?
The Silfab Solar SIL Prime 385-E Ultra costs approximately $1024 per panel ($$2.66/W). A typical 7kW system using this panel would cost around $18,620 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 385-E Ultra a good solar panel?
The Silfab Solar SIL Prime 385-E Ultra has 19.7% 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 385-E Ultra panels do I need?
For a typical 7kW residential system, you'd need approximately 19 panels. For a 10kW system, plan for about 26 panels. The exact number depends on your roof space, energy usage, and local sun hours.