Panasonic EVPV400H vs Aptos Solar DNA-120-BF26 370W
The Panasonic EVPV400H wins this comparison by a decisive margin. It leads in efficiency (21.2% vs 20.28%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EVPV400H is the stronger choice.
Key Differences
- • Panasonic EVPV400H is rated at 400W while Aptos Solar DNA-120-BF26 370W is rated at 370W, a 30W difference.
- • Panasonic EVPV400H achieves 21.2% efficiency vs 20.28% for the other, a 0.9 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Panasonic EVPV400H has a superior temperature coefficient of -0.26%/°C vs -0.36%/°C, retaining more power in hot climates.
- • Panasonic EVPV400H uses HJT (Heterojunction) cells while Aptos Solar DNA-120-BF26 370W uses PERC Mono Bifacial cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Panasonic EVPV400H achieves 21.2% module efficiency compared to Aptos Solar DNA-120-BF26 370W's 20.28%, meaning Panasonic EVPV400H converts 0.9 percentage points more sunlight into electricity per square meter. In practical terms, the Panasonic EVPV400H produces 204.8 watts per square meter of panel area while the Aptos Solar DNA-120-BF26 370W produces 200.4 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 Panasonic EVPV400H delivers 400W per panel versus 370W for the Aptos Solar DNA-120-BF26 370W, a 30W difference per module. To build an 8 kW residential system, you would need 20 Panasonic EVPV400H panels or 22 Aptos Solar DNA-120-BF26 370W panels. Choosing the higher-wattage option saves 2 panels, reducing total racking hardware, wiring, and installation labor costs. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Panasonic EVPV400H has a temperature coefficient of -0.26%/°C versus -0.36%/°C for the Aptos Solar DNA-120-BF26 370W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Panasonic EVPV400H retains 94.8% of its rated power while the other retains 92.8%. 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 Panasonic EVPV400H is backed by a 25-year product warranty and 25-year performance guarantee, while the Aptos Solar DNA-120-BF26 370W offers 25-year product and 30-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (0.5% first year then 0.35%/year for Panasonic EVPV400H; 1% first year then 0.54%/year for Aptos Solar DNA-120-BF26 370W), after 25 years the Panasonic EVPV400H should retain approximately 91.1% of original output versus 86.0% for the Aptos Solar DNA-120-BF26 370W. This 5.1 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Panasonic EVPV400H measures 1722×1134×30mm and weighs 21 kg, while the Aptos Solar DNA-120-BF26 370W measures 1762×1048×35mm at 20.5 kg. 1.95 m² of panel area for the Panasonic EVPV400H versus 1.85 m² for the Aptos Solar DNA-120-BF26 370W. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. The more compact Aptos Solar DNA-120-BF26 370W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Panasonic EVPV400H | Aptos Solar DNA-120-BF26 370W |
|---|---|---|
| Power | 400W | 370W |
| Efficiency | 21.2% | 20.28% |
| Power Density | 19.0 W/sq ft | 18.6 W/sq ft |
| Cell Type | HJT (Heterojunction) | PERC Mono Bifacial |
| Bifacial | Yes | Yes |
| Weight | 21 kg | 20.5 kg |
| Temp Coefficient | -0.26%/°C | -0.36%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 4000 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 0.5% | 1% |
| Annual Degradation | 0.35% | 0.54% |
| Country | Japan | Vietnam |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Panasonic EVPV400HThe Panasonic EVPV400H achieves 21.2% efficiency versus 20.28% — a 0.9 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.9 kW more total system capacity, or 5 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Panasonic EVPV400HThe Panasonic EVPV400H has a better temperature coefficient of -0.26%/°C versus -0.36%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 92.8%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Panasonic EVPV400HPanasonic EVPV400H degrades more slowly at 0.35% per year versus 0.54%. After 25 years, expect 91.1% vs 86.0% of original output for Panasonic EVPV400H and Aptos Solar DNA-120-BF26 370W respectively.
4. Power Output
Winner: Panasonic EVPV400HThe Panasonic EVPV400H delivers 400W versus 370W per panel — 30W more. For an 8 kW system, you need 20 panels with the higher-wattage option versus 22 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Panasonic EVPV400HThe Panasonic EVPV400H 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. The Aptos Solar DNA-120-BF26 370W uses PERC Mono Bifacial: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. HJT (Heterojunction) represents a newer generation technology with a longer performance runway as manufacturing matures.
Panasonic EVPV400H
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EVPV400H was Panasonic's standard HJT residential panel, delivering 400W with the brand's signature quality and longevity.
Pros
- + Panasonic reliability
- + HJT advantages
- + Solid 25-year warranty
- + Good all-round performer
Cons
- - DISCONTINUED - no longer manufactured
- - No new units available
- - No ongoing product support
Aptos Solar DNA-120-BF26 370W
Aptos Solar DNA-120-BF26 is a 370W bifacial all-black panel with up to 30% rear-side energy gain, ideal for residential installations seeking extra output.
Pros
- + Bifacial design for up to 30% additional rear-side energy
- + All-black aesthetic
- + Lightweight and easy to install
- + 30-year performance warranty
Cons
- - Lower 370W base output
- - Bifacial gain requires proper mounting conditions
- - 20.28% efficiency below top-tier panels
Choose Panasonic EVPV400H If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ 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
Choose Aptos Solar DNA-120-BF26 370W If...
- ✓ Homeowners with elevated mounting or reflective surfaces who want an aesthetically pleasing bifacial panel.
Our Recommendation
The Panasonic EVPV400H is the decisive winner in this solar panel comparison, outperforming the Aptos Solar DNA-120-BF26 370W in 5 of 5 dimensions. Unless you have a specific requirement that the Aptos Solar DNA-120-BF26 370W uniquely addresses, the Panasonic EVPV400H is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Panasonic EVPV400H or Aptos Solar DNA-120-BF26 370W?
The Panasonic EVPV400H wins this comparison by a decisive margin. It leads in efficiency (21.2% vs 20.28%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EVPV400H is the stronger choice.
Which panel is more efficient, Panasonic EVPV400H or Aptos Solar DNA-120-BF26 370W?
The Panasonic EVPV400H at 21.2% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.9 percentage points translates to approximately 30W per panel under standard test conditions.
Which has a better warranty, Panasonic EVPV400H or Aptos Solar DNA-120-BF26 370W?
The Panasonic EVPV400H comes with a 25-year product warranty and 25-year performance guarantee. The Aptos Solar DNA-120-BF26 370W offers 25-year product and 30-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Panasonic EVPV400H has a temperature coefficient of -0.26%/°C and the Aptos Solar DNA-120-BF26 370W is -0.36%/°C. Panasonic EVPV400H retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Panasonic EVPV400H vs Aptos Solar DNA-120-BF26 370W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Panasonic EVPV400H panels (400W each) or 22 Aptos Solar DNA-120-BF26 370W panels (370W each). The Panasonic EVPV400H requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026