Silfab SIL-370-BK 370W vs CertainTeed Solstice Solar Shingle
The Silfab SIL-370-BK 370W wins this comparison by a decisive margin. It leads in efficiency (20.4% vs 15.4%) and matches or exceeds on warranty (25 vs 15 years). For most residential installations, the Silfab SIL-370-BK 370W is the stronger choice.
Key Differences
- • Silfab SIL-370-BK 370W is rated at 370W while CertainTeed Solstice Solar Shingle is rated at 70W, a 300W difference.
- • Silfab SIL-370-BK 370W achieves 20.4% efficiency vs 15.4% for the other, a 5.0 percentage point gap.
- • Silfab SIL-370-BK 370W comes with a 25-year product warranty vs 15 years for the other.
- • Silfab SIL-370-BK 370W has a superior temperature coefficient of -0.35%/°C vs -0.4%/°C, retaining more power in hot climates.
- • Silfab SIL-370-BK 370W uses PERC Mono cells while CertainTeed Solstice Solar Shingle uses Monocrystalline cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Silfab SIL-370-BK 370W achieves 20.4% module efficiency compared to CertainTeed Solstice Solar Shingle's 15.4%, meaning Silfab SIL-370-BK 370W converts 5.0 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 CertainTeed Solstice Solar Shingle produces 101.8 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 Silfab SIL-370-BK 370W delivers 370W per panel versus 70W for the CertainTeed Solstice Solar Shingle, a 300W difference per module. To build an 8 kW residential system, you would need 22 Silfab SIL-370-BK 370W panels or 115 CertainTeed Solstice Solar Shingle panels. Choosing the higher-wattage option saves 93 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 Silfab SIL-370-BK 370W has a temperature coefficient of -0.35%/°C versus -0.4%/°C for the CertainTeed Solstice Solar Shingle. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Silfab SIL-370-BK 370W retains 93.0% of its rated power while the other retains 92.0%. 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 Silfab SIL-370-BK 370W is backed by a 25-year product warranty and 25-year performance guarantee, while the CertainTeed Solstice Solar Shingle offers 15-year product and 25-year performance coverage. The Silfab SIL-370-BK 370W provides 10 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 Silfab SIL-370-BK 370W; 2.5% first year then 0.6%/year for CertainTeed Solstice Solar Shingle), after 25 years the Silfab SIL-370-BK 370W should retain approximately 89.4% of original output versus 83.1% for the CertainTeed Solstice Solar Shingle. This 6.3 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The Silfab SIL-370-BK 370W measures 1722×1134×30mm and weighs 19.5 kg, while the CertainTeed Solstice Solar Shingle measures 2184×315×13mm at 5.9 kg. 1.95 m² of panel area for the Silfab SIL-370-BK 370W versus 0.69 m² for the CertainTeed Solstice Solar Shingle. The CertainTeed Solstice Solar Shingle is 13.6 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 272 kg. The more compact CertainTeed Solstice Solar Shingle may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Silfab SIL-370-BK 370W | CertainTeed Solstice Solar Shingle |
|---|---|---|
| Power | 370W | 70W |
| Efficiency | 20.4% | 15.4% |
| Power Density | 17.6 W/sq ft | 9.5 W/sq ft |
| Cell Type | PERC Mono | Monocrystalline |
| Bifacial | No | No |
| Weight | 19.5 kg | 5.9 kg |
| Temp Coefficient | -0.35%/°C | -0.4%/°C |
| Snow Load | 2400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 15 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1% | 2.5% |
| Annual Degradation | 0.4% | 0.6% |
| Country | United States | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Silfab SIL-370-BK 370WThe Silfab SIL-370-BK 370W achieves 20.4% efficiency versus 15.4% — a 5.0 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 9.0 kW more total system capacity, or 41 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Silfab SIL-370-BK 370WThe Silfab SIL-370-BK 370W has a better temperature coefficient of -0.35%/°C versus -0.4%/°C. On a 45°C summer day (20°C above STC), the winner retains 93.0% of rated power versus 92.0%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: Silfab SIL-370-BK 370WSilfab SIL-370-BK 370W leads with a 25-year product warranty versus 15 years. Silfab SIL-370-BK 370W degrades more slowly at 0.4% per year versus 0.6%. After 25 years, expect 89.4% vs 83.1% of original output for Silfab SIL-370-BK 370W and CertainTeed Solstice Solar Shingle respectively.
4. Power Output
Winner: Silfab SIL-370-BK 370WThe Silfab SIL-370-BK 370W delivers 370W versus 70W per panel — 300W more. For an 8 kW system, you need 22 panels with the higher-wattage option versus 115 panels, saving 93 panels and the associated racking and labor costs.
5. Cell Technology
Winner: CertainTeed Solstice Solar ShingleThe Silfab SIL-370-BK 370W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The CertainTeed Solstice Solar Shingle uses Monocrystalline: Monocrystalline. Monocrystalline represents a newer generation technology with a longer performance runway as manufacturing matures.
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
CertainTeed Solstice Solar Shingle
The CertainTeed Solstice Solar Shingle is a building-integrated photovoltaic (BIPV) product that replaces standard asphalt roofing shingles while generating electricity. Made by CertainTeed (a Saint-Gobain subsidiary), each 70W shingle integrates seamlessly with conventional asphalt roofing for a low-profile, aesthetically clean solar installation. Installed cost is $4.50-$6.00/W.
Pros
- + Seamless integration with asphalt roofing
- + Low-profile aesthetics — nearly invisible as solar
- + Class A fire rating
- + Made in the USA
- + 15-year product warranty backed by Saint-Gobain
- + Dual function as roof covering and power generation
Cons
- - 15.4% efficiency significantly lower than conventional panels
- - 70W per shingle requires many units for meaningful output
- - $4.50-$6.00/W installed — 2-3x the cost of standard panels
- - Higher temperature coefficient due to flush roof mounting
- - Limited installer availability — requires certified roofers
Choose Silfab SIL-370-BK 370W 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
- ✓ 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
Choose CertainTeed Solstice Solar Shingle If...
- ✓ Homeowners who prioritize roof aesthetics and want solar that blends invisibly with traditional roofing, especially in HOA-restricted neighborhoods.
Our Recommendation
The Silfab SIL-370-BK 370W is the decisive winner in this solar panel comparison, outperforming the CertainTeed Solstice Solar Shingle in 4 of 5 dimensions. Unless you have a specific requirement that the CertainTeed Solstice Solar Shingle uniquely addresses, the Silfab SIL-370-BK 370W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Silfab SIL-370-BK 370W or CertainTeed Solstice Solar Shingle?
The Silfab SIL-370-BK 370W wins this comparison by a decisive margin. It leads in efficiency (20.4% vs 15.4%) and matches or exceeds on warranty (25 vs 15 years). For most residential installations, the Silfab SIL-370-BK 370W is the stronger choice.
Which panel is more efficient, Silfab SIL-370-BK 370W or CertainTeed Solstice Solar Shingle?
The Silfab SIL-370-BK 370W at 20.4% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 5.0 percentage points translates to approximately 300W per panel under standard test conditions.
Which has a better warranty, Silfab SIL-370-BK 370W or CertainTeed Solstice Solar Shingle?
The Silfab SIL-370-BK 370W comes with a 25-year product warranty and 25-year performance guarantee. The CertainTeed Solstice Solar Shingle offers 15-year product and 25-year performance warranties. Silfab SIL-370-BK 370W provides 10 additional years of product coverage.
Which panel performs better in hot weather?
The Silfab SIL-370-BK 370W has a temperature coefficient of -0.35%/°C and the CertainTeed Solstice Solar Shingle is -0.4%/°C. Silfab SIL-370-BK 370W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Silfab SIL-370-BK 370W vs CertainTeed Solstice Solar Shingle 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 115 CertainTeed Solstice Solar Shingle panels (70W each). The Silfab SIL-370-BK 370W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026