LONGi Solar — China
Hi-MO 7 400W B Black
The LONGi Solar Hi-MO 7 400W B Black is a 400W PERC solar panel with 19.6% efficiency. Backed by a 25-year warranty.
Standard TierFEOC: Restricted
400W
Wattage
19.6%
Efficiency
PERC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- LONGi Solar
- Model
- Hi-MO 7 400W B Black
- Series
- Hi-MO 7
- Wattage
- 400W
- Module Efficiency
- 19.6%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 46 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $1.97
- Est. 7kW System Cost
- $13,790
- Est. 10kW System Cost
- $19,700
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- No
- Origin
- China
- FEOC Status
- fail
Other LONGi Solar Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| Hi-MO 480W D | 480W | 22.1% | N-Type TOPCon | $2.67 |
| Hi-MO X 480W D | 480W | 22.1% | N-Type TOPCon | $2.67 |
| Hi-MO 5 480W D | 480W | 22.1% | N-Type TOPCon | $2.67 |
| Hi-MO 6 480W D | 480W | 22.1% | N-Type TOPCon | $2.67 |
| Hi-MO 7 480W D | 480W | 22.1% | N-Type TOPCon | $2.67 |
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 LONGi Solar Hi-MO 7 400W B Black cost?
The LONGi Solar Hi-MO 7 400W B Black costs approximately $788 per panel ($$1.97/W). A typical 7kW system using this panel would cost around $13,790 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 LONGi Solar Hi-MO 7 400W B Black a good solar panel?
The LONGi Solar Hi-MO 7 400W B Black has 19.6% 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 LONGi Solar Hi-MO 7 400W B 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.