Panasonic EVPV400H vs Mission Solar MSE415
The Panasonic EVPV400H wins this comparison by a clear margin. It leads in efficiency (21.2% vs 21%) 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 Mission Solar MSE415 is rated at 415W, a 15W difference.
- • Panasonic EVPV400H achieves 21.2% efficiency vs 21% for the other, a 0.2 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Panasonic EVPV400H has a superior temperature coefficient of -0.26%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Panasonic EVPV400H uses HJT (Heterojunction) cells while Mission Solar MSE415 uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Panasonic EVPV400H achieves 21.2% module efficiency compared to Mission Solar MSE415's 21%, meaning Panasonic EVPV400H converts 0.2 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 Mission Solar MSE415 produces 212.5 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 Mission Solar MSE415 delivers 415W per panel versus 400W for the Panasonic EVPV400H, a 15W difference per module. To build an 8 kW residential system, you would need 20 Panasonic EVPV400H panels or 20 Mission Solar MSE415 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 EVPV400H has a temperature coefficient of -0.26%/°C versus -0.34%/°C for the Mission Solar MSE415. 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 93.2%. 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 Mission Solar MSE415 offers 25-year product and 25-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 0.4%/year for Mission Solar MSE415), after 25 years the Panasonic EVPV400H should retain approximately 91.1% of original output versus 89.4% for the Mission Solar MSE415. This 1.7 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 Mission Solar MSE415 measures 1722×1134×30mm at 21.5 kg. 1.95 m² of panel area for the Panasonic EVPV400H versus 1.95 m² for the Mission Solar MSE415. 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 | Panasonic EVPV400H | Mission Solar MSE415 |
|---|---|---|
| Power | 400W | 415W |
| Efficiency | 21.2% | 21% |
| Power Density | 19.0 W/sq ft | 19.7 W/sq ft |
| Cell Type | HJT (Heterojunction) | PERC Mono |
| Bifacial | Yes | No |
| Weight | 21 kg | 21.5 kg |
| Temp Coefficient | -0.26%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 0.5% | 1% |
| Annual Degradation | 0.35% | 0.4% |
| Country | Japan | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Panasonic EVPV400HThe Panasonic EVPV400H achieves 21.2% efficiency versus 21% — a 0.2 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.5 kW more total system capacity, or 3 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 -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 93.2%. 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 0.4%. After 25 years, expect 91.1% vs 89.4% of original output for Panasonic EVPV400H and Mission Solar MSE415 respectively.
4. Power Output
Winner: Mission Solar MSE415The Mission Solar MSE415 delivers 415W versus 400W per panel — 15W 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 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 Mission Solar MSE415 uses PERC Mono: 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
Mission Solar MSE415
Mission Solar MSE415 is a US-manufactured PERC panel delivering 415W, designed and assembled in San Antonio, Texas.
Pros
- + Made in USA (San Antonio, TX)
- + 25-year product warranty
- + Supports US solar jobs
- + Good PERC performance
Cons
- - Lower efficiency vs imports
- - Higher cost
- - Limited model selection
Choose Panasonic EVPV400H If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ 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
- ✓ No longer available for new installations.
Choose Mission Solar MSE415 If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Patriotic homeowners wanting Texas-made solar panels with a strong warranty.
Our Recommendation
We recommend the Panasonic EVPV400H for most buyers in this comparison. It wins 4 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Mission Solar MSE415 remains a good product, but the Panasonic EVPV400H delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Panasonic EVPV400H or Mission Solar MSE415?
The Panasonic EVPV400H wins this comparison by a clear margin. It leads in efficiency (21.2% vs 21%) 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 Mission Solar MSE415?
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 0.2 percentage points translates to approximately 15W per panel under standard test conditions.
Which has a better warranty, Panasonic EVPV400H or Mission Solar MSE415?
The Panasonic EVPV400H comes with a 25-year product warranty and 25-year performance guarantee. The Mission Solar MSE415 offers 25-year product and 25-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 Mission Solar MSE415 is -0.34%/°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 Mission Solar MSE415 panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Panasonic EVPV400H panels (400W each) or 20 Mission Solar MSE415 panels (415W each). The Mission Solar MSE415 requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026