REC TwinPeak 5 420W vs Panasonic EverVolt 410
The Panasonic EverVolt 410 wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 21.4%) and matches or exceeds on warranty (25 vs 20 years). For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Key Differences
- • REC TwinPeak 5 420W is rated at 420W while Panasonic EverVolt 410 is rated at 410W, a 10W difference.
- • Panasonic EverVolt 410 achieves 21.5% efficiency vs 21.4% for the other, a 0.1 percentage point gap.
- • Panasonic EverVolt 410 comes with a 25-year product warranty vs 20 years for the other.
- • Panasonic EverVolt 410 has a superior temperature coefficient of -0.26%/°C vs -0.32%/°C, retaining more power in hot climates.
- • REC TwinPeak 5 420W uses PERC Mono cells while Panasonic EverVolt 410 uses HJT (Heterojunction) cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Panasonic EverVolt 410 achieves 21.5% module efficiency compared to REC TwinPeak 5 420W's 21.4%, meaning Panasonic EverVolt 410 converts 0.1 percentage points more sunlight into electricity per square meter. In practical terms, the REC TwinPeak 5 420W produces 215.1 watts per square meter of panel area while the Panasonic EverVolt 410 produces 210.0 W/m². For rooftop installations where space is limited, this efficiency gap determines how many kilowatts you can fit on your available roof area. Over a 25-year system life, even a small efficiency advantage compounds into meaningful additional energy production.
Power Output
The REC TwinPeak 5 420W delivers 420W per panel versus 410W for the Panasonic EverVolt 410, a 10W difference per module. To build an 8 kW residential system, you would need 20 REC TwinPeak 5 420W panels or 20 Panasonic EverVolt 410 panels. Despite the per-panel wattage difference, both require the same number of panels for this system size due to rounding. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Panasonic EverVolt 410 has a temperature coefficient of -0.26%/°C versus -0.32%/°C for the REC TwinPeak 5 420W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Panasonic EverVolt 410 retains 94.8% of its rated power while the other retains 93.6%. This difference is particularly significant in hot climates such as the American Southwest, the Middle East, and Southeast Asia, where panels routinely operate 30-40°C above STC for several hours each day. Over the system lifetime, the cumulative energy advantage from a better temperature coefficient can amount to 2-4% of total production.
Warranty Coverage
The REC TwinPeak 5 420W is backed by a 20-year product warranty and 25-year performance guarantee, while the Panasonic EverVolt 410 offers 25-year product and 25-year performance coverage. The Panasonic EverVolt 410 provides 5 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1% first year then 0.4%/year for REC TwinPeak 5 420W; 0.5% first year then 0.35%/year for Panasonic EverVolt 410), after 25 years the REC TwinPeak 5 420W should retain approximately 89.4% of original output versus 91.1% for the Panasonic EverVolt 410. This 1.7 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The REC TwinPeak 5 420W measures 1722×1134×30mm and weighs 21 kg, while the Panasonic EverVolt 410 measures 1722×1134×30mm at 21.5 kg. 1.95 m² of panel area for the REC TwinPeak 5 420W versus 1.95 m² for the Panasonic EverVolt 410. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | REC TwinPeak 5 420W | Panasonic EverVolt 410 |
|---|---|---|
| Power | 420W | 410W |
| Efficiency | 21.4% | 21.5% |
| Power Density | 20.0 W/sq ft | 19.5 W/sq ft |
| Cell Type | PERC Mono | HJT (Heterojunction) |
| Bifacial | No | Yes |
| Weight | 21 kg | 21.5 kg |
| Temp Coefficient | -0.32%/°C | -0.26%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 3600 Pa | 2400 Pa |
| Product Warranty | 20 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1% | 0.5% |
| Annual Degradation | 0.4% | 0.35% |
| Country | Singapore | Japan |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Panasonic EverVolt 410The Panasonic EverVolt 410 achieves 21.5% efficiency versus 21.4% — a 0.1 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.3 kW more total system capacity, or 2 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Panasonic EverVolt 410The Panasonic EverVolt 410 has a better temperature coefficient of -0.26%/°C versus -0.32%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 93.6%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Panasonic EverVolt 410Panasonic EverVolt 410 leads with a 25-year product warranty versus 20 years. Panasonic EverVolt 410 degrades more slowly at 0.35% per year versus 0.4%. After 25 years, expect 89.4% vs 91.1% of original output for REC TwinPeak 5 420W and Panasonic EverVolt 410 respectively.
4. Power Output
Winner: REC TwinPeak 5 420WThe REC TwinPeak 5 420W delivers 420W versus 410W per panel — 10W more. For an 8 kW system, you need 20 panels with the higher-wattage option versus 20 panels, saving 0 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Panasonic EverVolt 410The REC TwinPeak 5 420W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The Panasonic EverVolt 410 uses HJT (Heterojunction): HJT (Heterojunction) combines crystalline silicon with amorphous silicon layers, delivering the best temperature coefficient and bifacial gains, but at higher manufacturing cost. HJT (Heterojunction) represents a newer generation technology with a longer performance runway as manufacturing matures.
REC TwinPeak 5 420W
The REC TwinPeak 5 delivers 420W using proven PERC technology with REC's signature half-cut cell design and 20-year product warranty.
Pros
- + Strong 20-year product warranty
- + Good shade tolerance
- + Proven half-cut design
- + European engineering
Cons
- - Lower efficiency vs HJT models
- - PERC limitations
- - Premium vs Chinese brands
Panasonic EverVolt 410
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EverVolt 410 offered Panasonic's HJT technology at a slightly more accessible price point while maintaining premium quality.
Pros
- + Panasonic brand quality
- + HJT cell technology
- + Good temperature performance
- + 25-year warranty
Cons
- - DISCONTINUED - no longer manufactured
- - No new units available
- - No ongoing product support
Choose REC TwinPeak 5 420W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Homeowners wanting European-quality PERC panels with a strong warranty.
Choose Panasonic EverVolt 410 If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You want maximum output retention over the system's 25-30 year lifespan
- ✓ You prefer newer cell technology with a longer performance improvement runway
Our Recommendation
The Panasonic EverVolt 410 is the decisive winner in this solar panel comparison, outperforming the REC TwinPeak 5 420W in 4 of 5 dimensions. Unless you have a specific requirement that the REC TwinPeak 5 420W uniquely addresses, the Panasonic EverVolt 410 is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, REC TwinPeak 5 420W or Panasonic EverVolt 410?
The Panasonic EverVolt 410 wins this comparison by a decisive margin. It leads in efficiency (21.5% vs 21.4%) and matches or exceeds on warranty (25 vs 20 years). For most residential installations, the Panasonic EverVolt 410 is the stronger choice.
Which panel is more efficient, REC TwinPeak 5 420W or Panasonic EverVolt 410?
The Panasonic EverVolt 410 at 21.5% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.1 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, REC TwinPeak 5 420W or Panasonic EverVolt 410?
The REC TwinPeak 5 420W comes with a 20-year product warranty and 25-year performance guarantee. The Panasonic EverVolt 410 offers 25-year product and 25-year performance warranties. Panasonic EverVolt 410 provides 5 additional years of product coverage.
Which panel performs better in hot weather?
The REC TwinPeak 5 420W has a temperature coefficient of -0.32%/°C and the Panasonic EverVolt 410 is -0.26%/°C. Panasonic EverVolt 410 retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many REC TwinPeak 5 420W vs Panasonic EverVolt 410 panels do I need for an 8 kW system?
For an 8 kW system: you need 20 REC TwinPeak 5 420W panels (420W each) or 20 Panasonic EverVolt 410 panels (410W each). The REC TwinPeak 5 420W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026