Mission Solar MSE415 vs First Solar Series 6 Plus 465W
The Mission Solar MSE415 wins this comparison by a decisive margin. It leads in efficiency (21% vs 19.2%) and matches or exceeds on warranty (25 vs 10 years). For most residential installations, the Mission Solar MSE415 is the stronger choice.
Key Differences
- • Mission Solar MSE415 is rated at 415W while First Solar Series 6 Plus 465W is rated at 465W, a 50W difference.
- • Mission Solar MSE415 achieves 21% efficiency vs 19.2% for the other, a 1.8 percentage point gap.
- • Mission Solar MSE415 comes with a 25-year product warranty vs 10 years for the other.
- • First Solar Series 6 Plus 465W has a superior temperature coefficient of -0.28%/°C vs -0.34%/°C, retaining more power in hot climates.
- • Mission Solar MSE415 uses PERC Mono cells while First Solar Series 6 Plus 465W uses CdTe (Cadmium Telluride) cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Mission Solar MSE415 achieves 21% module efficiency compared to First Solar Series 6 Plus 465W's 19.2%, meaning Mission Solar MSE415 converts 1.8 percentage points more sunlight into electricity per square meter. In practical terms, the Mission Solar MSE415 produces 212.5 watts per square meter of panel area while the First Solar Series 6 Plus 465W produces 187.9 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 First Solar Series 6 Plus 465W delivers 465W per panel versus 415W for the Mission Solar MSE415, a 50W difference per module. To build an 8 kW residential system, you would need 20 Mission Solar MSE415 panels or 18 First Solar Series 6 Plus 465W 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 First Solar Series 6 Plus 465W has a temperature coefficient of -0.28%/°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 First Solar Series 6 Plus 465W retains 94.4% 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 Mission Solar MSE415 is backed by a 25-year product warranty and 25-year performance guarantee, while the First Solar Series 6 Plus 465W offers 10-year product and 30-year performance coverage. The Mission Solar MSE415 provides 15 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 Mission Solar MSE415; 1.5% first year then 0.5%/year for First Solar Series 6 Plus 465W), after 25 years the Mission Solar MSE415 should retain approximately 89.4% of original output versus 86.5% for the First Solar Series 6 Plus 465W. This 2.9 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Mission Solar MSE415 measures 1722×1134×30mm and weighs 21.5 kg, while the First Solar Series 6 Plus 465W measures 2009×1232×49mm at 34.5 kg. 1.95 m² of panel area for the Mission Solar MSE415 versus 2.48 m² for the First Solar Series 6 Plus 465W. The Mission Solar MSE415 is 13.0 kg lighter per panel, which reduces structural load requirements on the roof and makes handling easier during installation. For a 20-panel system, that is a total weight difference of 260 kg. The more compact Mission Solar MSE415 may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Mission Solar MSE415 | First Solar Series 6 Plus 465W |
|---|---|---|
| Power | 415W | 465W |
| Efficiency | 21% | 19.2% |
| Power Density | 19.7 W/sq ft | 17.5 W/sq ft |
| Cell Type | PERC Mono | CdTe (Cadmium Telluride) |
| Bifacial | No | No |
| Weight | 21.5 kg | 34.5 kg |
| Temp Coefficient | -0.34%/°C | -0.28%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 4000 Pa |
| Product Warranty | 25 years | 10 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1% | 1.5% |
| Annual Degradation | 0.4% | 0.5% |
| Country | United States | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Mission Solar MSE415The Mission Solar MSE415 achieves 21% efficiency versus 19.2% — a 1.8 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.5 kW more total system capacity, or 7 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: First Solar Series 6 Plus 465WThe First Solar Series 6 Plus 465W has a better temperature coefficient of -0.28%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.4% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Mission Solar MSE415Mission Solar MSE415 leads with a 25-year product warranty versus 10 years. Mission Solar MSE415 degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 89.4% vs 86.5% of original output for Mission Solar MSE415 and First Solar Series 6 Plus 465W respectively.
4. Power Output
Winner: First Solar Series 6 Plus 465WThe First Solar Series 6 Plus 465W delivers 465W versus 415W per panel — 50W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 20 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: First Solar Series 6 Plus 465WThe Mission Solar MSE415 uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The First Solar Series 6 Plus 465W uses CdTe (Cadmium Telluride): CdTe (Cadmium Telluride). CdTe (Cadmium Telluride) represents a newer generation technology with a longer performance runway as manufacturing matures.
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
First Solar Series 6 Plus 465W
The Series 6 Plus delivers 465W using First Solar's proven CdTe thin-film technology, manufactured in the United States.
Pros
- + Proven US thin-film technology
- + Excellent temperature coefficient
- + Environmentally responsible
- + Strong bankability
Cons
- - Lower efficiency
- - Very heavy panel
- - Not suitable for residential
Choose Mission Solar MSE415 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 want maximum output retention over the system's 25-30 year lifespan
- ✓ Patriotic homeowners wanting Texas-made solar panels with a strong warranty.
Choose First Solar Series 6 Plus 465W If...
- ✓ 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
- ✓ Large commercial and utility projects wanting proven US thin-film technology.
Our Recommendation
The Mission Solar MSE415 is the decisive winner in this solar panel comparison, outperforming the First Solar Series 6 Plus 465W in 2 of 5 dimensions. Unless you have a specific requirement that the First Solar Series 6 Plus 465W uniquely addresses, the Mission Solar MSE415 is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Mission Solar MSE415 or First Solar Series 6 Plus 465W?
The Mission Solar MSE415 wins this comparison by a decisive margin. It leads in efficiency (21% vs 19.2%) and matches or exceeds on warranty (25 vs 10 years). For most residential installations, the Mission Solar MSE415 is the stronger choice.
Which panel is more efficient, Mission Solar MSE415 or First Solar Series 6 Plus 465W?
The Mission Solar MSE415 at 21% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.8 percentage points translates to approximately 50W per panel under standard test conditions.
Which has a better warranty, Mission Solar MSE415 or First Solar Series 6 Plus 465W?
The Mission Solar MSE415 comes with a 25-year product warranty and 25-year performance guarantee. The First Solar Series 6 Plus 465W offers 10-year product and 30-year performance warranties. Mission Solar MSE415 provides 15 additional years of product coverage.
Which panel performs better in hot weather?
The Mission Solar MSE415 has a temperature coefficient of -0.34%/°C and the First Solar Series 6 Plus 465W is -0.28%/°C. First Solar Series 6 Plus 465W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Mission Solar MSE415 vs First Solar Series 6 Plus 465W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 Mission Solar MSE415 panels (415W each) or 18 First Solar Series 6 Plus 465W panels (465W each). The First Solar Series 6 Plus 465W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026