Qcells — South Korea/US
Q.PLUS-42 HD
The Qcells Q.PLUS-42 HD is a 420W PERC solar panel with 20.6% efficiency. Backed by a 25-year warranty.
Premium Tier
420W
Wattage
20.6%
Efficiency
PERC
Cell Type
25 years
Warranty
Full Specifications
- Brand
- Qcells
- Model
- Q.PLUS-42 HD
- Series
- Q.PLUS
- Wattage
- 420W
- Module Efficiency
- 20.6%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 48 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $2.80
- Est. 7kW System Cost
- $19,600
- Est. 10kW System Cost
- $28,000
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- No
- Origin
- South Korea/US
- FEOC Status
- check
Other Qcells Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| Q.TRON 475W E Pro | 475W | 22.7% | PERC | $3.36 |
| Q.PEAK 475W E Pro | 475W | 22.7% | PERC | $3.36 |
| Q.PLUS 475W E Pro | 475W | 22.7% | PERC | $3.36 |
| Q.PEAK DUO 475W E Pro | 475W | 22.7% | PERC | $3.36 |
| Q.MAX 475W E Pro | 475W | 22.7% | PERC | $3.36 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| Maxeon Maxeon 3 450W D Plus | 450W | 23.3% | $4.61 |
| Maxeon Maxeon 6 450W D Plus | 450W | 23.3% | $4.61 |
| Maxeon Maxeon 7 450W D Plus | 450W | 23.3% | $4.61 |
| Maxeon Maxeon Air 450W D Plus | 450W | 23.3% | $4.61 |
Frequently Asked Questions
How much does a 420W Qcells Q.PLUS-42 HD cost?
The Qcells Q.PLUS-42 HD costs approximately $1176 per panel ($$2.80/W). A typical 7kW system using this panel would cost around $19,600 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 Qcells Q.PLUS-42 HD a good solar panel?
The Qcells Q.PLUS-42 HD has 20.6% efficiency and a 25 years warranty, placing it in the premium tier. This is a solid mid-range panel suitable for most residential installations.
How many Qcells Q.PLUS-42 HD panels do I need?
For a typical 7kW residential system, you'd need approximately 17 panels. For a 10kW system, plan for about 24 panels. The exact number depends on your roof space, energy usage, and local sun hours.