SunPower — US
X-Series 405W A Max
The SunPower X-Series 405W A Max is a 405W IBC solar panel with 21.7% efficiency. Made in US. Backed by a 30-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus EligibleBifacial
405W
Wattage
21.7%
Efficiency
IBC
Cell Type
30 years
Warranty
Full Specifications
- Brand
- SunPower
- Model
- X-Series 405W A Max
- Series
- X-Series
- Wattage
- 405W
- Module Efficiency
- 21.7%
- Cell Type
- IBC
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 30 years
- Est. Price Per Watt
- $4.00
- Est. 7kW System Cost
- $28,000
- Est. 10kW System Cost
- $40,000
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- Yes
- 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 435W E Max | 435W | 22.7% | $4.29 |
| Maxeon Maxeon 3 435W B All-Black | 435W | 22.7% | $4.29 |
| Maxeon Maxeon 6 435W E Max | 435W | 22.7% | $4.29 |
| Maxeon Maxeon 6 435W B All-Black | 435W | 22.7% | $4.29 |
Frequently Asked Questions
How much does a 405W SunPower X-Series 405W A Max cost?
The SunPower X-Series 405W A Max costs approximately $1620 per panel ($$4.00/W). A typical 7kW system using this panel would cost around $28,000 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 X-Series 405W A Max a good solar panel?
The SunPower X-Series 405W A Max has 21.7% efficiency and a 30 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 X-Series 405W 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 25 panels. The exact number depends on your roof space, energy usage, and local sun hours.