First Solar — US
Series 6 400W C HD
The First Solar Series 6 400W C HD is a 400W CdTe solar panel with 18.0% efficiency. Made in US. Backed by a 25-year warranty.
Premium Tier🇺🇸 Domestic Content Bonus Eligible
400W
Wattage
18%
Efficiency
CdTe
Cell Type
25 years
Warranty
Full Specifications
- Brand
- First Solar
- Model
- Series 6 400W C HD
- Series
- Series 6
- Wattage
- 400W
- Module Efficiency
- 18%
- Cell Type
- CdTe
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.50
- Est. 7kW System Cost
- $17,500
- Est. 10kW System Cost
- $25,000
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- No
- Origin
- US
- FEOC Status
- pass
Other First Solar Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| Series 6 475W E Pro | 475W | 20.5% | CdTe | $3.75 |
| Series 7 475W E Pro | 475W | 20.5% | CdTe | $3.75 |
| Series 4 475W E Pro | 475W | 20.5% | CdTe | $3.75 |
| Series 5 475W E Pro | 475W | 20.5% | CdTe | $3.75 |
| Series 6 465W D Plus | 465W | 20.2% | CdTe | $3.60 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| SunPower Maxeon 430W E Max | 430W | 22.6% | $4.38 |
| SunPower Maxeon 430W B All-Black | 430W | 22.6% | $4.38 |
| SunPower Maxeon 430W C Black | 430W | 22.6% | $4.38 |
| SunPower Performance 430W E Max | 430W | 22.6% | $4.38 |
Frequently Asked Questions
How much does a 400W First Solar Series 6 400W C HD cost?
The First Solar Series 6 400W C HD costs approximately $1000 per panel ($$2.50/W). A typical 7kW system using this panel would cost around $17,500 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 First Solar Series 6 400W C HD a good solar panel?
The First Solar Series 6 400W C HD has 18% 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 First Solar Series 6 400W C 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.