SunPower — US
X-Series 350W Plus
The SunPower X-Series 350W Plus is a 350W IBC solar panel with 19.8% efficiency. Made in US. Backed by a 25-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus Eligible
350W
Wattage
19.8%
Efficiency
IBC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- SunPower
- Model
- X-Series 350W Plus
- Series
- X-Series
- Wattage
- 350W
- Module Efficiency
- 19.8%
- Cell Type
- IBC
- Dimensions
- 65-67" x 39-40"
- Weight
- 40 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $3.21
- Est. 7kW System Cost
- $22,470
- Est. 10kW System Cost
- $32,100
- 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 370W | 370W | 20.2% | $2.98 |
| Maxeon Maxeon 3 370W Plus | 370W | 20.2% | $2.98 |
| Maxeon Maxeon 3-37 BF | 370W | 20.2% | $2.98 |
| Maxeon Maxeon 6 370W | 370W | 20.2% | $2.98 |
Frequently Asked Questions
How much does a 350W SunPower X-Series 350W Plus cost?
The SunPower X-Series 350W Plus costs approximately $1124 per panel ($$3.21/W). A typical 7kW system using this panel would cost around $22,470 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 350W Plus a good solar panel?
The SunPower X-Series 350W Plus has 19.8% efficiency and a 25 years warranty, placing it in the premium 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 SunPower X-Series 350W Plus panels do I need?
For a typical 7kW residential system, you'd need approximately 20 panels. For a 10kW system, plan for about 29 panels. The exact number depends on your roof space, energy usage, and local sun hours.