Solar4America — US
S4A Pro 450W D
The Solar4America S4A Pro 450W D is a 450W PERC solar panel with 21.7% efficiency. Made in US. Backed by a 30-year warranty.
Standard Tier🇺🇸 Domestic Content Bonus EligibleBifacial
450W
Wattage
21.7%
Efficiency
PERC
Cell Type
30 years
Warranty
Full Specifications
- Brand
- Solar4America
- Model
- S4A Pro 450W D
- Series
- S4A Pro
- Wattage
- 450W
- Module Efficiency
- 21.7%
- Cell Type
- PERC
- Dimensions
- 78-82" x 39-41"
- Weight
- 53 lbs
- Warranty
- 30 years
- Est. Price Per Watt
- $2.97
- Est. 7kW System Cost
- $20,790
- Est. 10kW System Cost
- $29,700
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- Yes
- Origin
- US
- FEOC Status
- pass
Other Solar4America Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| S4A 450W D | 450W | 21.7% | PERC | $2.97 |
| S4A Max 450W D | 450W | 21.7% | PERC | $2.97 |
| S4A 445W C All-Black | 445W | 21.5% | N-Type TOPCon | $2.92 |
| S4A Pro 445W C All-Black | 445W | 21.5% | N-Type TOPCon | $2.92 |
| S4A Max 445W C All-Black | 445W | 21.5% | N-Type TOPCon | $2.92 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| Maxeon Maxeon 3 455W E Pro | 455W | 23.5% | $4.72 |
| Maxeon Maxeon 6 455W E Pro | 455W | 23.5% | $4.72 |
| Maxeon Maxeon 7 455W E Pro | 455W | 23.5% | $4.72 |
| Maxeon Maxeon Air 455W E Pro | 455W | 23.5% | $4.72 |
Frequently Asked Questions
How much does a 450W Solar4America S4A Pro 450W D cost?
The Solar4America S4A Pro 450W D costs approximately $1337 per panel ($$2.97/W). A typical 7kW system using this panel would cost around $20,790 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 Solar4America S4A Pro 450W D a good solar panel?
The Solar4America S4A Pro 450W D has 21.7% efficiency and a 30 years warranty, placing it in the standard tier. This is above-average efficiency, making it a strong choice. It also qualifies for the domestic content bonus under the Inflation Reduction Act.
How many Solar4America S4A Pro 450W D panels do I need?
For a typical 7kW residential system, you'd need approximately 16 panels. For a 10kW system, plan for about 23 panels. The exact number depends on your roof space, energy usage, and local sun hours.