JA Solar JAM54S31 415W vs Aptos Solar DNA-144-MF26 440W
The Aptos Solar DNA-144-MF26 440W wins this comparison by a decisive margin. It delivers more power (440W vs 415W). For most residential installations, the Aptos Solar DNA-144-MF26 440W is the stronger choice.
Key Differences
- • JA Solar JAM54S31 415W is rated at 415W while Aptos Solar DNA-144-MF26 440W is rated at 440W, a 25W difference.
- • JA Solar JAM54S31 415W achieves 21.5% efficiency vs 20.21% for the other, a 1.3 percentage point gap.
- • Aptos Solar DNA-144-MF26 440W comes with a 25-year product warranty vs 12 years for the other.
- • JA Solar JAM54S31 415W has a superior temperature coefficient of -0.34%/°C vs -0.35%/°C, retaining more power in hot climates.
Specifications Breakdown
Module Efficiency
The JA Solar JAM54S31 415W achieves 21.5% module efficiency compared to Aptos Solar DNA-144-MF26 440W's 20.21%, meaning JA Solar JAM54S31 415W converts 1.3 percentage points more sunlight into electricity per square meter. In practical terms, the JA Solar JAM54S31 415W produces 212.5 watts per square meter of panel area while the Aptos Solar DNA-144-MF26 440W produces 202.1 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 Aptos Solar DNA-144-MF26 440W delivers 440W per panel versus 415W for the JA Solar JAM54S31 415W, a 25W difference per module. To build an 8 kW residential system, you would need 20 JA Solar JAM54S31 415W panels or 19 Aptos Solar DNA-144-MF26 440W panels. Choosing the higher-wattage option saves 1 panel, 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 JA Solar JAM54S31 415W has a temperature coefficient of -0.34%/°C versus -0.35%/°C for the Aptos Solar DNA-144-MF26 440W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the JA Solar JAM54S31 415W retains 93.2% of its rated power while the other retains 93.0%. 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 JA Solar JAM54S31 415W is backed by a 12-year product warranty and 25-year performance guarantee, while the Aptos Solar DNA-144-MF26 440W offers 25-year product and 30-year performance coverage. The Aptos Solar DNA-144-MF26 440W provides 13 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1.5% first year then 0.5%/year for JA Solar JAM54S31 415W; 1% first year then 0.54%/year for Aptos Solar DNA-144-MF26 440W), after 25 years the JA Solar JAM54S31 415W should retain approximately 86.5% of original output versus 86.0% for the Aptos Solar DNA-144-MF26 440W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The JA Solar JAM54S31 415W measures 1722×1134×30mm and weighs 21.5 kg, while the Aptos Solar DNA-144-MF26 440W measures 2095×1039×40mm at 24.1 kg. 1.95 m² of panel area for the JA Solar JAM54S31 415W versus 2.18 m² for the Aptos Solar DNA-144-MF26 440W. The JA Solar JAM54S31 415W is 2.6 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 52 kg. The more compact JA Solar JAM54S31 415W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | JA Solar JAM54S31 415W | Aptos Solar DNA-144-MF26 440W |
|---|---|---|
| Power | 415W | 440W |
| Efficiency | 21.5% | 20.21% |
| Power Density | 19.7 W/sq ft | 18.8 W/sq ft |
| Cell Type | PERC Mono | PERC Mono |
| Bifacial | No | No |
| Weight | 21.5 kg | 24.1 kg |
| Temp Coefficient | -0.34%/°C | -0.35%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 4000 Pa |
| Product Warranty | 12 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.5% | 0.54% |
| Country | China | Vietnam |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: JA Solar JAM54S31 415WThe JA Solar JAM54S31 415W achieves 21.5% efficiency versus 20.21% — a 1.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.8 kW more total system capacity, or 4 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: JA Solar JAM54S31 415WThe JA Solar JAM54S31 415W has a better temperature coefficient of -0.34%/°C versus -0.35%/°C. On a 45°C summer day (20°C above STC), the winner retains 93.2% of rated power versus 93.0%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: Aptos Solar DNA-144-MF26 440WAptos Solar DNA-144-MF26 440W leads with a 25-year product warranty versus 12 years. JA Solar JAM54S31 415W degrades more slowly at 0.5% per year versus 0.54%. After 25 years, expect 86.5% vs 86.0% of original output for JA Solar JAM54S31 415W and Aptos Solar DNA-144-MF26 440W respectively.
4. Power Output
Winner: Aptos Solar DNA-144-MF26 440WThe Aptos Solar DNA-144-MF26 440W delivers 440W versus 415W per panel — 25W more. For an 8 kW system, you need 19 panels with the higher-wattage option versus 20 panels, saving 1 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.
JA Solar JAM54S31 415W
The JAM54S31 is a compact residential PERC panel delivering 415W with a solid balance of performance and affordability.
Pros
- + Compact residential form factor
- + Good price-performance ratio
- + Widely available
- + Proven reliability
Cons
- - Lower efficiency vs N-type
- - Higher degradation rate
- - Standard warranty
Aptos Solar DNA-144-MF26 440W
Aptos Solar DNA-144-MF26 is a 440W all-black monofacial panel with 144 half-cut cells, designed for commercial and large residential systems.
Pros
- + 440W output in a full-size 144-cell format
- + All-black aesthetic design
- + 30-year performance warranty
- + Competitive pricing
Cons
- - Larger dimensions require more roof space
- - 20.21% efficiency is moderate
- - No bifacial capability
Choose JA Solar JAM54S31 415W 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
- ✓ Budget residential installations seeking reliable PERC performance.
Choose Aptos Solar DNA-144-MF26 440W 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 25+ years
- ✓ Commercial installations and large residential systems needing high wattage with clean all-black aesthetics.
Our Recommendation
The Aptos Solar DNA-144-MF26 440W is the decisive winner in this solar panel comparison, outperforming the JA Solar JAM54S31 415W in 2 of 5 dimensions. Unless you have a specific requirement that the JA Solar JAM54S31 415W uniquely addresses, the Aptos Solar DNA-144-MF26 440W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, JA Solar JAM54S31 415W or Aptos Solar DNA-144-MF26 440W?
The Aptos Solar DNA-144-MF26 440W wins this comparison by a decisive margin. It delivers more power (440W vs 415W). For most residential installations, the Aptos Solar DNA-144-MF26 440W is the stronger choice.
Which panel is more efficient, JA Solar JAM54S31 415W or Aptos Solar DNA-144-MF26 440W?
The JA Solar JAM54S31 415W at 21.5% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.3 percentage points translates to approximately 25W per panel under standard test conditions.
Which has a better warranty, JA Solar JAM54S31 415W or Aptos Solar DNA-144-MF26 440W?
The JA Solar JAM54S31 415W comes with a 12-year product warranty and 25-year performance guarantee. The Aptos Solar DNA-144-MF26 440W offers 25-year product and 30-year performance warranties. Aptos Solar DNA-144-MF26 440W provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The JA Solar JAM54S31 415W has a temperature coefficient of -0.34%/°C and the Aptos Solar DNA-144-MF26 440W is -0.35%/°C. JA Solar JAM54S31 415W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many JA Solar JAM54S31 415W vs Aptos Solar DNA-144-MF26 440W panels do I need for an 8 kW system?
For an 8 kW system: you need 20 JA Solar JAM54S31 415W panels (415W each) or 19 Aptos Solar DNA-144-MF26 440W panels (440W each). The Aptos Solar DNA-144-MF26 440W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026