SunPower — US
P-Series 400W D Max
The SunPower P-Series 400W D Max is a 400W IBC solar panel with 21.5% efficiency. Made in US. Backed by a 25-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus Eligible
400W
Wattage
21.5%
Efficiency
IBC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- SunPower
- Model
- P-Series 400W D Max
- Series
- P-Series
- Wattage
- 400W
- Module Efficiency
- 21.5%
- Cell Type
- IBC
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $3.92
- Est. 7kW System Cost
- $27,440
- Est. 10kW System Cost
- $39,200
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- No
- Origin
- US
- FEOC Status
- pass
Other SunPower Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| Maxeon 455W E Pro | 455W | 23.4% | IBC | $4.71 |
| Performance 455W E Pro | 455W | 23.4% | IBC | $4.71 |
| X-Series 455W E Pro | 455W | 23.4% | IBC | $4.71 |
| E-Series 455W E Pro | 455W | 23.4% | IBC | $4.71 |
| P-Series 455W E Pro | 455W | 23.4% | IBC | $4.71 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| Maxeon Maxeon 3 430W B Silver | 430W | 22.5% | $4.19 |
| Maxeon Maxeon 3 430W D Pro | 430W | 22.5% | $4.19 |
| Maxeon Maxeon 3 430W E HC | 430W | 22.5% | $4.19 |
| Maxeon Maxeon 3 430W A BF | 430W | 22.5% | $4.19 |
Frequently Asked Questions
How much does a 400W SunPower P-Series 400W D Max cost?
The SunPower P-Series 400W D Max costs approximately $1568 per panel ($$3.92/W). A typical 7kW system using this panel would cost around $27,440 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 SunPower P-Series 400W D Max a good solar panel?
The SunPower P-Series 400W D Max has 21.5% efficiency and a 25 years warranty, placing it in the premium 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 SunPower P-Series 400W D Max 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.