Segment Solar — US
SG 365-E Ultra
The Segment Solar SG 365-E Ultra is a 365W PERC solar panel with 18.7% efficiency. Made in US. Backed by a 25-year warranty.
Standard Tier🇺🇸 Domestic Content Bonus EligibleBifacial
365W
Wattage
18.7%
Efficiency
PERC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Segment Solar
- Model
- SG 365-E Ultra
- Series
- SG
- Wattage
- 365W
- Module Efficiency
- 18.7%
- Cell Type
- PERC
- Dimensions
- 65-67" x 39-40"
- Weight
- 41 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.25
- Est. 7kW System Cost
- $15,750
- Est. 10kW System Cost
- $22,500
- 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 395W E BF | 395W | 21.4% | $3.87 |
| Maxeon 3 395W A | 395W | 21.2% | $3.51 |
| SunPower Maxeon 390W B Plus | 390W | 21.2% | $3.79 |
| SunPower Maxeon 385W D HC | 385W | 21% | $3.71 |
Frequently Asked Questions
How much does a 365W Segment Solar SG 365-E Ultra cost?
The Segment Solar SG 365-E Ultra costs approximately $821 per panel ($$2.25/W). A typical 7kW system using this panel would cost around $15,750 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 365-E Ultra a good solar panel?
The Segment Solar SG 365-E Ultra has 18.7% 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 365-E Ultra panels do I need?
For a typical 7kW residential system, you'd need approximately 20 panels. For a 10kW system, plan for about 28 panels. The exact number depends on your roof space, energy usage, and local sun hours.