Panasonic — Japan
HIT 420W D Plus
The Panasonic HIT 420W D Plus is a 420W HJT solar panel with 22.3% efficiency. Made in Japan. Backed by a 30-year warranty.
Discontinued panel — still supported for existing owners. Panasonic ended in-house solar panel manufacturing in 2022 Specs below reflect the final production version.
Premium Tier
420W
Wattage
22.3%
Efficiency
HJT
Cell Type
30 years
Warranty
Full Specifications
- Brand
- Panasonic
- Model
- HIT 420W D Plus
- Series
- HIT
- Wattage
- 420W
- Module Efficiency
- 22.3%
- Cell Type
- HJT
- Dimensions
- 66-80" x 39-41"
- Weight
- 48 lbs
- Warranty
- 30 years
- Est. Price Per Watt
- $4.08
- Est. 7kW System Cost
- $28,560
- Est. 10kW System Cost
- $40,800
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- No
- Origin
- Japan
- FEOC Status
- likely_pass
Other Panasonic Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| HIT 425W E Pro | 425W | 22.5% | HJT | $4.18 |
| HIT 420W A Ultra | 420W | 22.3% | HJT | $4.08 |
| HIT 415W C | 415W | 22% | HJT | $3.94 |
| HIT 415W E Max | 415W | 22% | HJT | $3.94 |
| HIT 410W D Pro | 410W | 21.7% | HJT | $3.80 |
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 Panasonic HIT 420W D Plus cost?
The Panasonic HIT 420W D Plus costs approximately $1714 per panel ($$4.08/W). A typical 7kW system using this panel would cost around $28,560 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 Panasonic HIT 420W D Plus a good solar panel?
The Panasonic HIT 420W D Plus has 22.3% efficiency and a 30 years warranty, placing it in the premium tier. This is above-average efficiency, making it a strong choice.
How many Panasonic HIT 420W D Plus 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.