REC — Singapore
Alpha 420W E Ultra
The REC Alpha 420W E Ultra is a 420W N-Type TOPCon solar panel with 21.4% efficiency. Backed by a 25-year warranty.
Premium Tier
420W
Wattage
21.4%
Efficiency
N-Type TOPCon
Cell Type
25 years
Warranty
Full Specifications
- Brand
- REC
- Model
- Alpha 420W E Ultra
- Series
- Alpha
- Wattage
- 420W
- Module Efficiency
- 21.4%
- Cell Type
- N-Type TOPCon
- Dimensions
- 66-80" x 39-41"
- Weight
- 48 lbs
- Warranty
- 25 years
- Est. Price Per Watt
- $3.29
- Est. 7kW System Cost
- $23,030
- Est. 10kW System Cost
- $32,900
- Temperature Coefficient
- -0.25%/°C
- Bifacial
- No
- Origin
- Singapore
- FEOC Status
- likely_pass
Other REC Panels
| Model | Wattage | Efficiency | Cell | $/W |
|---|---|---|---|---|
| Alpha 455W E Pro | 455W | 23% | N-Type TOPCon | $3.84 |
| Alpha 450W D Plus | 450W | 22.8% | HJT | $3.77 |
| Alpha 445W A Ultra | 445W | 22.5% | HJT | $3.67 |
| Alpha 440W C | 440W | 22.3% | N-Type TOPCon | $3.60 |
| Alpha 435W E Max | 435W | 22.1% | N-Type TOPCon | $3.53 |
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 REC Alpha 420W E Ultra cost?
The REC Alpha 420W E Ultra costs approximately $1382 per panel ($$3.29/W). A typical 7kW system using this panel would cost around $23,030 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 REC Alpha 420W E Ultra a good solar panel?
The REC Alpha 420W E Ultra has 21.4% efficiency and a 25 years warranty, placing it in the premium tier. This is above-average efficiency, making it a strong choice.
How many REC Alpha 420W E Ultra 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.