Segment Solar — US
SG 405W D Pro
The Segment Solar SG 405W D Pro is a 405W PERC solar panel with 20.0% efficiency. Made in US. Backed by a 25-year warranty.
Standard Tier🇺🇸 Domestic Content Bonus EligibleBifacial
405W
Wattage
20%
Efficiency
PERC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Segment Solar
- Model
- SG 405W D Pro
- Series
- SG
- Wattage
- 405W
- Module Efficiency
- 20%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.58
- Est. 7kW System Cost
- $18,060
- Est. 10kW System Cost
- $25,800
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- Yes
- Origin
- US
- FEOC Status
- pass
Other Segment Solar Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| SG 440W D | 440W | 21.2% | PERC | $2.88 |
| SG 435W C All-Black | 435W | 21% | N-Type TOPCon | $2.83 |
| SG 430W E Pro | 430W | 20.8% | N-Type TOPCon | $2.78 |
| SG 425W B BF | 425W | 20.7% | PERC | $2.75 |
| SG 420W A HC | 420W | 20.5% | N-Type TOPCon | $2.70 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| SunPower Maxeon 435W A Ultra | 435W | 22.7% | $4.42 |
| Maxeon 3 435W E Max | 435W | 22.7% | $4.29 |
| SunPower Maxeon 430W E Max | 430W | 22.6% | $4.38 |
| SunPower Maxeon 430W C Black | 430W | 22.6% | $4.38 |
Frequently Asked Questions
How much does a 405W Segment Solar SG 405W D Pro cost?
The Segment Solar SG 405W D Pro costs approximately $1045 per panel ($$2.58/W). A typical 7kW system using this panel would cost around $18,060 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 Segment Solar SG 405W D Pro a good solar panel?
The Segment Solar SG 405W D Pro 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 Segment Solar SG 405W D Pro 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.