Solar4America — US
S4A Pro 420W B All-Black
The Solar4America S4A Pro 420W B All-Black is a 420W PERC solar panel with 20.7% efficiency. Made in US. Backed by a 30-year warranty.
Standard Tier🇺🇸 Domestic Content Bonus EligibleBifacial
420W
Wattage
20.7%
Efficiency
PERC
Cell Type
30 years
Warranty
Full Specifications
- Brand
- Solar4America
- Model
- S4A Pro 420W B All-Black
- Series
- S4A Pro
- Wattage
- 420W
- Module Efficiency
- 20.7%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 48 lbs
- Warranty
- 30 years
- Est. Price Per Watt
- $2.72
- Est. 7kW System Cost
- $19,040
- Est. 10kW System Cost
- $27,200
- 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 Pro 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 |
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 Solar4America S4A Pro 420W B All-Black cost?
The Solar4America S4A Pro 420W B All-Black costs approximately $1142 per panel ($$2.72/W). A typical 7kW system using this panel would cost around $19,040 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 420W B All-Black a good solar panel?
The Solar4America S4A Pro 420W B All-Black has 20.7% efficiency and a 30 years warranty, placing it in the standard 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 Solar4America S4A Pro 420W B All-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.