BYD — China
Premium 420W B
The BYD Premium 420W B is a 420W PERC solar panel with 19.7% efficiency. Backed by a 12-year warranty.
Budget TierFEOC: Restricted
420W
Wattage
19.7%
Efficiency
PERC
Cell Type
12 years
Warranty
Full Specifications
- Brand
- BYD
- Model
- Premium 420W B
- Series
- Premium
- Wattage
- 420W
- Module Efficiency
- 19.7%
- Cell Type
- PERC
- Dimensions
- 66-80" x 39-41"
- Weight
- 48 lbs
- Warranty
- 12 years
- Est. Price Per Watt
- $1.92
- Est. 7kW System Cost
- $13,440
- Est. 10kW System Cost
- $19,200
- Temperature Coefficient
- -0.35%/°C
- Bifacial
- No
- Origin
- China
- FEOC Status
- fail
Other BYD Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| Premium 460W D Plus | 460W | 21% | PERC | $2.38 |
| Premium 455W C | 455W | 20.8% | N-Type TOPCon | $2.31 |
| Premium 450W A Ultra | 450W | 20.7% | PERC | $2.27 |
| Premium 445W E Max | 445W | 20.5% | N-Type TOPCon | $2.20 |
| Premium 445W B All-Black | 445W | 20.5% | PERC | $2.20 |
Similar Wattage Panels (Competitors)
| Panel | Wattage | Efficiency | $/W |
|---|---|---|---|
| Maxeon 3 450W D Plus | 450W | 23.3% | $4.61 |
| SunPower Maxeon 445W D Plus | 445W | 23.1% | $4.58 |
| Maxeon 3 445W A Ultra | 445W | 23.1% | $4.51 |
| SunPower Maxeon 440W C | 440W | 22.9% | $4.50 |
Frequently Asked Questions
How much does a 420W BYD Premium 420W B cost?
The BYD Premium 420W B costs approximately $806 per panel ($$1.92/W). A typical 7kW system using this panel would cost around $13,440 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 BYD Premium 420W B a good solar panel?
The BYD Premium 420W B has 19.7% efficiency and a 12 years warranty, placing it in the budget tier. This is a solid mid-range panel suitable for most residential installations.
How many BYD Premium 420W B 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.