S-Energy — South Korea
SN 405W A Black
The S-Energy SN 405W A Black is a 405W PERC solar panel with 19.8% efficiency. Backed by a 25-year warranty.
Standard TierBifacial
405W
Wattage
19.8%
Efficiency
PERC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- S-Energy
- Model
- SN 405W A Black
- Series
- SN
- Wattage
- 405W
- Module Efficiency
- 19.8%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.59
- Est. 7kW System Cost
- $18,130
- Est. 10kW System Cost
- $25,900
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- Yes
- Origin
- South Korea
- FEOC Status
- check
Other S-Energy Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| SN 445W D | 445W | 21.2% | PERC | $3.01 |
| SN 440W C All-Black | 440W | 21% | N-Type TOPCon | $2.95 |
| SN 435W E Pro | 435W | 20.9% | N-Type TOPCon | $2.92 |
| SN 430W B BF | 430W | 20.7% | PERC | $2.86 |
| SN 425W A HC | 425W | 20.5% | N-Type TOPCon | $2.80 |
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 S-Energy SN 405W A Black cost?
The S-Energy SN 405W A Black costs approximately $1049 per panel ($$2.59/W). A typical 7kW system using this panel would cost around $18,130 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 S-Energy SN 405W A Black a good solar panel?
The S-Energy SN 405W A Black has 19.8% efficiency and a 25 years warranty, placing it in the standard tier. This is a solid mid-range panel suitable for most residential installations.
How many S-Energy SN 405W A Black 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.