Renogy 320W Mono Solar Panel vs CertainTeed Solstice Solar Panel 365W
The CertainTeed Solstice Solar Panel 365W wins this comparison by a decisive margin. It delivers more power (365W vs 320W). For most residential installations, the CertainTeed Solstice Solar Panel 365W is the stronger choice.
Key Differences
- • Renogy 320W Mono Solar Panel is rated at 320W while CertainTeed Solstice Solar Panel 365W is rated at 365W, a 45W difference.
- • Renogy 320W Mono Solar Panel achieves 20.3% efficiency vs 19.9% for the other, a 0.4 percentage point gap.
- • CertainTeed Solstice Solar Panel 365W comes with a 10-year product warranty vs 5 years for the other.
- • Renogy 320W Mono Solar Panel has a superior temperature coefficient of -0.35%/°C vs -0.36%/°C, retaining more power in hot climates.
- • Renogy 320W Mono Solar Panel uses Monocrystalline cells while CertainTeed Solstice Solar Panel 365W uses Monocrystalline PERC cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Renogy 320W Mono Solar Panel achieves 20.3% module efficiency compared to CertainTeed Solstice Solar Panel 365W's 19.9%, meaning Renogy 320W Mono Solar Panel converts 0.4 percentage points more sunlight into electricity per square meter. In practical terms, the Renogy 320W Mono Solar Panel produces 293.3 watts per square meter of panel area while the CertainTeed Solstice Solar Panel 365W produces 199.2 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 CertainTeed Solstice Solar Panel 365W delivers 365W per panel versus 320W for the Renogy 320W Mono Solar Panel, a 45W difference per module. To build an 8 kW residential system, you would need 25 Renogy 320W Mono Solar Panel panels or 22 CertainTeed Solstice Solar Panel 365W panels. Choosing the higher-wattage option saves 3 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 Renogy 320W Mono Solar Panel has a temperature coefficient of -0.35%/°C versus -0.36%/°C for the CertainTeed Solstice Solar Panel 365W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Renogy 320W Mono Solar Panel retains 93.0% of its rated power while the other retains 92.8%. While the numerical gap is modest, it still accumulates over decades of summer production, especially in southern latitudes with prolonged peak heat hours.
Warranty Coverage
The Renogy 320W Mono Solar Panel is backed by a 5-year product warranty and 25-year performance guarantee, while the CertainTeed Solstice Solar Panel 365W offers 10-year product and 25-year performance coverage. The CertainTeed Solstice Solar Panel 365W provides 5 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (2% first year then 0.55%/year for Renogy 320W Mono Solar Panel; 2% first year then 0.55%/year for CertainTeed Solstice Solar Panel 365W), after 25 years the Renogy 320W Mono Solar Panel should retain approximately 84.8% of original output versus 84.8% for the CertainTeed Solstice Solar Panel 365W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Renogy 320W Mono Solar Panel measures 1638×666×35mm and weighs 18.5 kg, while the CertainTeed Solstice Solar Panel 365W measures 1755×1044×40mm at 21.6 kg. 1.09 m² of panel area for the Renogy 320W Mono Solar Panel versus 1.83 m² for the CertainTeed Solstice Solar Panel 365W. The Renogy 320W Mono Solar Panel is 3.1 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 62 kg. The more compact Renogy 320W Mono Solar Panel may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Renogy 320W Mono Solar Panel | CertainTeed Solstice Solar Panel 365W |
|---|---|---|
| Power | 320W | 365W |
| Efficiency | 20.3% | 19.9% |
| Power Density | 27.3 W/sq ft | 18.5 W/sq ft |
| Cell Type | Monocrystalline | Monocrystalline PERC |
| Bifacial | No | No |
| Weight | 18.5 kg | 21.6 kg |
| Temp Coefficient | -0.35%/°C | -0.36%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 5 years | 10 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 2% | 2% |
| Annual Degradation | 0.55% | 0.55% |
| Country | China | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Renogy 320W Mono Solar PanelThe Renogy 320W Mono Solar Panel achieves 20.3% efficiency versus 19.9% — a 0.4 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.4 kW more total system capacity, or 7 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Renogy 320W Mono Solar PanelThe Renogy 320W Mono Solar Panel has a better temperature coefficient of -0.35%/°C versus -0.36%/°C. On a 45°C summer day (20°C above STC), the winner retains 93.0% of rated power versus 92.8%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: CertainTeed Solstice Solar Panel 365WCertainTeed Solstice Solar Panel 365W leads with a 10-year product warranty versus 5 years. After 25 years, expect 84.8% vs 84.8% of original output for Renogy 320W Mono Solar Panel and CertainTeed Solstice Solar Panel 365W respectively.
4. Power Output
Winner: CertainTeed Solstice Solar Panel 365WThe CertainTeed Solstice Solar Panel 365W delivers 365W versus 320W per panel — 45W more. For an 8 kW system, you need 22 panels with the higher-wattage option versus 25 panels, saving 3 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Renogy 320W Mono Solar PanelThe Renogy 320W Mono Solar Panel uses Monocrystalline: Monocrystalline. The CertainTeed Solstice Solar Panel 365W uses Monocrystalline PERC: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. Monocrystalline represents a newer generation technology with a longer performance runway as manufacturing matures.
Renogy 320W Mono Solar Panel
The Renogy 320W Mono Solar Panel is a versatile mid-power panel suitable for both residential rooftop and off-grid ground-mount installations, delivering 320W with proven monocrystalline technology.
Pros
- + Versatile for residential and off-grid use
- + UL 1703 certified for building-mounted installations
- + Competitive price at $0.62-0.78/W
- + Half-cut cell design reduces shading losses
- + Manageable weight at 18.5 kg
Cons
- - 20.3% efficiency below premium panels
- - 5-year material warranty shorter than Tier 1 brands
- - Standard monocrystalline (not N-Type or TOPCon)
- - Higher degradation rate than N-Type alternatives
CertainTeed Solstice Solar Panel 365W
The CertainTeed Solstice Solar Panel 365W is a conventional residential solar panel from CertainTeed (Saint-Gobain), using monocrystalline PERC half-cut cells. Designed to pair with CertainTeed roofing products for a coordinated roof-and-solar installation through certified roofing contractors.
Pros
- + Made in the USA by Saint-Gobain subsidiary
- + 10-year product warranty — strong for US-manufactured panel
- + Designed for seamless pairing with CertainTeed roofing
- + Half-cut PERC cells for partial shade resilience
- + Available through established roofing contractor network
Cons
- - 19.9% efficiency below current N-Type leaders
- - 365W output lower than modern 400W+ panels
- - Heavier at 21.6 kg than comparable wattage panels
- - Higher cost per watt than budget alternatives
- - Limited distribution outside CertainTeed roofing dealers
Choose Renogy 320W Mono Solar Panel 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
- ✓ Budget-conscious homeowners and off-grid builders needing a reliable, certified mid-power panel.
Choose CertainTeed Solstice Solar Panel 365W If...
- ✓ 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 10+ years
- ✓ Homeowners doing a combined roof replacement and solar installation through CertainTeed-certified contractors.
Our Recommendation
The CertainTeed Solstice Solar Panel 365W is the decisive winner in this solar panel comparison, outperforming the Renogy 320W Mono Solar Panel in 2 of 5 dimensions. Unless you have a specific requirement that the Renogy 320W Mono Solar Panel uniquely addresses, the CertainTeed Solstice Solar Panel 365W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Renogy 320W Mono Solar Panel or CertainTeed Solstice Solar Panel 365W?
The CertainTeed Solstice Solar Panel 365W wins this comparison by a decisive margin. It delivers more power (365W vs 320W). For most residential installations, the CertainTeed Solstice Solar Panel 365W is the stronger choice.
Which panel is more efficient, Renogy 320W Mono Solar Panel or CertainTeed Solstice Solar Panel 365W?
The Renogy 320W Mono Solar Panel at 20.3% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.4 percentage points translates to approximately 45W per panel under standard test conditions.
Which has a better warranty, Renogy 320W Mono Solar Panel or CertainTeed Solstice Solar Panel 365W?
The Renogy 320W Mono Solar Panel comes with a 5-year product warranty and 25-year performance guarantee. The CertainTeed Solstice Solar Panel 365W offers 10-year product and 25-year performance warranties. CertainTeed Solstice Solar Panel 365W provides 5 additional years of product coverage.
Which panel performs better in hot weather?
The Renogy 320W Mono Solar Panel has a temperature coefficient of -0.35%/°C and the CertainTeed Solstice Solar Panel 365W is -0.36%/°C. Renogy 320W Mono Solar Panel retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Renogy 320W Mono Solar Panel vs CertainTeed Solstice Solar Panel 365W panels do I need for an 8 kW system?
For an 8 kW system: you need 25 Renogy 320W Mono Solar Panel panels (320W each) or 22 CertainTeed Solstice Solar Panel 365W panels (365W each). The CertainTeed Solstice Solar Panel 365W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026