Solar4America — US
S4A Pro 390W A Max
The Solar4America S4A Pro 390W A Max is a 390W PERC solar panel with 19.7% efficiency. Made in US. Backed by a 30-year warranty.
Standard Tier🇺🇸 Domestic Content Bonus EligibleBifacial
390W
Wattage
19.7%
Efficiency
PERC
Cell Type
30 years
Warranty
Full Specifications
- Brand
- Solar4America
- Model
- S4A Pro 390W A Max
- Series
- S4A Pro
- Wattage
- 390W
- Module Efficiency
- 19.7%
- Cell Type
- PERC
- Dimensions
- 65-67" x 39-40"
- Weight
- 44 lbs
- Warranty
- 30 years
- Est. Price Per Watt
- $2.47
- Est. 7kW System Cost
- $17,290
- Est. 10kW System Cost
- $24,700
- 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 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 |
|---|---|---|---|
| Panasonic EverVolt 420W A Ultra | 420W | 22.3% | $4.08 |
| Panasonic EverVolt 420W D Plus | 420W | 22.3% | $4.08 |
| Panasonic EverVolt VK 420W A Ultra | 420W | 22.3% | $4.08 |
| Panasonic EverVolt VK 420W D Plus | 420W | 22.3% | $4.08 |
Frequently Asked Questions
How much does a 390W Solar4America S4A Pro 390W A Max cost?
The Solar4America S4A Pro 390W A Max costs approximately $963 per panel ($$2.47/W). A typical 7kW system using this panel would cost around $17,290 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 390W A Max a good solar panel?
The Solar4America S4A Pro 390W A Max has 19.7% 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 390W A Max panels do I need?
For a typical 7kW residential system, you'd need approximately 18 panels. For a 10kW system, plan for about 26 panels. The exact number depends on your roof space, energy usage, and local sun hours.