Solar4America — US
S4A 400W D HD
The Solar4America S4A 400W D HD is a 400W N-Type TOPCon solar panel with 20.0% efficiency. Made in US. Backed by a 25-year warranty.
Standard Tier🇺🇸 Domestic Content Bonus Eligible
400W
Wattage
20%
Efficiency
N-Type TOPCon
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Solar4America
- Model
- S4A 400W D HD
- Series
- S4A
- Wattage
- 400W
- Module Efficiency
- 20%
- Cell Type
- N-Type TOPCon
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.55
- Est. 7kW System Cost
- $17,850
- Est. 10kW System Cost
- $25,500
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- No
- Origin
- US
- FEOC Status
- pass
Other Solar4America Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| S4A 450W D | 450W | 21.7% | PERC | $2.97 |
| S4A 445W C All-Black | 445W | 21.5% | N-Type TOPCon | $2.92 |
| S4A 440W E Pro | 440W | 21.3% | N-Type TOPCon | $2.88 |
| S4A 435W B BF | 435W | 21.2% | PERC | $2.85 |
| S4A 430W A HC | 430W | 21% | N-Type TOPCon | $2.80 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| SunPower Maxeon 430W E Max | 430W | 22.6% | $4.38 |
| SunPower Maxeon 430W C Black | 430W | 22.6% | $4.38 |
| Panasonic HIT 425W E Pro | 425W | 22.5% | $4.18 |
| Maxeon 3 430W E HC | 430W | 22.5% | $4.19 |
Frequently Asked Questions
How much does a 400W Solar4America S4A 400W D HD cost?
The Solar4America S4A 400W D HD costs approximately $1020 per panel ($$2.55/W). A typical 7kW system using this panel would cost around $17,850 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 Solar4America S4A 400W D HD a good solar panel?
The Solar4America S4A 400W D HD has 20% efficiency and a 25 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 400W D 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.