Silfab SIL-370-BK 370W vs Mission Solar MSE400
The Mission Solar MSE400 wins this comparison by a narrow margin. It leads in efficiency (20.6% vs 20.4%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Mission Solar MSE400 is the stronger choice.
Key Differences
- • Silfab SIL-370-BK 370W is rated at 370W while Mission Solar MSE400 is rated at 400W, a 30W difference.
- • Mission Solar MSE400 achieves 20.6% efficiency vs 20.4% for the other, a 0.2 percentage point gap.
- • Both carry matching 25-year product warranties.
Specifications Breakdown
Module Efficiency
The Mission Solar MSE400 achieves 20.6% module efficiency compared to Silfab SIL-370-BK 370W's 20.4%, meaning Mission Solar MSE400 converts 0.2 percentage points more sunlight into electricity per square meter. In practical terms, the Silfab SIL-370-BK 370W produces 189.5 watts per square meter of panel area while the Mission Solar MSE400 produces 204.8 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 MSE400 delivers 400W per panel versus 370W for the Silfab SIL-370-BK 370W, a 30W difference per module. To build an 8 kW residential system, you would need 22 Silfab SIL-370-BK 370W panels or 20 Mission Solar MSE400 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
Both panels share an identical temperature coefficient of -0.35%/°C, meaning they lose power at the same rate as cell temperature rises above the 25°C standard test baseline. At 65°C cell temperature, both retain 93.0% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Silfab SIL-370-BK 370W is backed by a 25-year product warranty and 25-year performance guarantee, while the Mission Solar MSE400 offers 25-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1% first year then 0.4%/year for Silfab SIL-370-BK 370W; 1% first year then 0.4%/year for Mission Solar MSE400), after 25 years the Silfab SIL-370-BK 370W should retain approximately 89.4% of original output versus 89.4% for the Mission Solar MSE400. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Silfab SIL-370-BK 370W measures 1722×1134×30mm and weighs 19.5 kg, while the Mission Solar MSE400 measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Silfab SIL-370-BK 370W versus 1.95 m² for the Mission Solar MSE400. 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 | Silfab SIL-370-BK 370W | Mission Solar MSE400 |
|---|---|---|
| Power | 370W | 400W |
| Efficiency | 20.4% | 20.6% |
| Power Density | 17.6 W/sq ft | 19.0 W/sq ft |
| Cell Type | PERC Mono | PERC Mono |
| Bifacial | No | No |
| Weight | 19.5 kg | 21 kg |
| Temp Coefficient | -0.35%/°C | -0.35%/°C |
| Snow Load | 2400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | United States | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Mission Solar MSE400The Mission Solar MSE400 achieves 20.6% efficiency versus 20.4% — a 0.2 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: TieBoth panels share a temperature coefficient of -0.35%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: TieBoth panels offer identical 25-year product warranties and 0.4% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Mission Solar MSE400The Mission Solar MSE400 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: TieBoth panels use PERC Mono cell technology. No technology advantage for either product.
Silfab SIL-370-BK 370W
The SIL-370-BK is Silfab's entry-level US-made all-black panel delivering 370W for budget-conscious domestic installations.
Pros
- + Made in USA
- + All-black design
- + 25-year warranty
- + ARRA compliant
Cons
- - Lower wattage
- - Basic PERC technology
- - Less competitive efficiency
Mission Solar MSE400
The MSE400 delivers 400W from Mission Solar's Texas manufacturing facility with a 25-year comprehensive warranty.
Pros
- + US manufactured
- + 25-year warranty
- + Texas-made quality
- + Buy America eligible
Cons
- - Lower wattage
- - Standard PERC efficiency
- - Limited availability
Choose Silfab SIL-370-BK 370W If...
- ✓ Government or institutional projects requiring ARRA/Buy America compliance.
Choose Mission Solar MSE400 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
- ✓ Residential and commercial projects requiring US-manufactured panels.
Our Recommendation
Both the Silfab SIL-370-BK 370W and Mission Solar MSE400 are excellent solar panel options, and the margin between them is narrow. The Mission Solar MSE400 wins 2 of 5 comparison dimensions by a slim margin. Your decision may come down to local pricing, installer availability, and which specific performance metrics matter most for your project. Either product is a solid investment.
Frequently Asked Questions
Which is better, Silfab SIL-370-BK 370W or Mission Solar MSE400?
The Mission Solar MSE400 wins this comparison by a narrow margin. It leads in efficiency (20.6% vs 20.4%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Mission Solar MSE400 is the stronger choice.
Which panel is more efficient, Silfab SIL-370-BK 370W or Mission Solar MSE400?
The Mission Solar MSE400 at 20.6% 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 30W per panel under standard test conditions.
Which has a better warranty, Silfab SIL-370-BK 370W or Mission Solar MSE400?
The Silfab SIL-370-BK 370W comes with a 25-year product warranty and 25-year performance guarantee. The Mission Solar MSE400 offers 25-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Silfab SIL-370-BK 370W has a temperature coefficient of -0.35%/°C and the Mission Solar MSE400 is -0.35%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Silfab SIL-370-BK 370W vs Mission Solar MSE400 panels do I need for an 8 kW system?
For an 8 kW system: you need 22 Silfab SIL-370-BK 370W panels (370W each) or 20 Mission Solar MSE400 panels (400W each). The Mission Solar MSE400 requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026