JA Solar JAM54S31 415W vs Tongwei THN-PE14M10 450W
The Tongwei THN-PE14M10 450W wins this comparison by a narrow margin. It delivers more power (450W vs 415W). For most residential installations, the Tongwei THN-PE14M10 450W is the stronger choice.
Key Differences
- • JA Solar JAM54S31 415W is rated at 415W while Tongwei THN-PE14M10 450W is rated at 450W, a 35W difference.
- • Both achieve identical 21.5% module efficiency.
- • Both carry matching 12-year product warranties.
Specifications Breakdown
Module Efficiency
Both the JA Solar JAM54S31 415W and Tongwei THN-PE14M10 450W share identical 21.5% module efficiency, producing comparable power per unit area. The JA Solar JAM54S31 415W generates 212.5 W/m² while the Tongwei THN-PE14M10 450W generates 225.2 W/m² based on their respective panel dimensions. With matched efficiency, neither panel holds a density advantage for space-constrained rooftop installations, so other factors like warranty coverage and temperature performance become the deciding metrics.
Power Output
The Tongwei THN-PE14M10 450W delivers 450W per panel versus 415W for the JA Solar JAM54S31 415W, a 35W difference per module. To build an 8 kW residential system, you would need 20 JA Solar JAM54S31 415W panels or 18 Tongwei THN-PE14M10 450W 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 -0.34%/°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 93.2% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The JA Solar JAM54S31 415W is backed by a 12-year product warranty and 25-year performance guarantee, while the Tongwei THN-PE14M10 450W offers 12-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1.5% first year then 0.5%/year for JA Solar JAM54S31 415W; 1.5% first year then 0.5%/year for Tongwei THN-PE14M10 450W), after 25 years the JA Solar JAM54S31 415W should retain approximately 86.5% of original output versus 86.5% for the Tongwei THN-PE14M10 450W. 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 Tongwei THN-PE14M10 450W measures 1762×1134×30mm at 23 kg. 1.95 m² of panel area for the JA Solar JAM54S31 415W versus 2.00 m² for the Tongwei THN-PE14M10 450W. 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 | JA Solar JAM54S31 415W | Tongwei THN-PE14M10 450W |
|---|---|---|
| Power | 415W | 450W |
| Efficiency | 21.5% | 21.5% |
| Power Density | 19.7 W/sq ft | 20.9 W/sq ft |
| Cell Type | PERC Mono | PERC Mono |
| Bifacial | No | No |
| Weight | 21.5 kg | 23 kg |
| Temp Coefficient | -0.34%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 12 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1.5% | 1.5% |
| Annual Degradation | 0.5% | 0.5% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: TieBoth panels achieve 21.5% module efficiency, producing identical power per square meter. Neither has an advantage in space-constrained installations.
2. Hot Climate Performance
Winner: TieBoth panels share a temperature coefficient of -0.34%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: TieBoth panels offer identical 12-year product warranties and 0.5% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Tongwei THN-PE14M10 450WThe Tongwei THN-PE14M10 450W delivers 450W versus 415W per panel — 35W 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: 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
Tongwei THN-PE14M10 450W
Tongwei's THN-PE14M10 delivers 450W using proven PERC technology at a very competitive price point.
Pros
- + Very competitive pricing
- + Good output for size
- + Strong cell technology
- + Growing brand
Cons
- - Less known outside China
- - Standard warranty
- - Limited US distribution
Choose JA Solar JAM54S31 415W If...
- ✓ Budget residential installations seeking reliable PERC performance.
Choose Tongwei THN-PE14M10 450W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ Value-focused projects seeking affordable panels from a major cell producer.
Our Recommendation
Both the JA Solar JAM54S31 415W and Tongwei THN-PE14M10 450W are excellent solar panel options, and the margin between them is narrow. The Tongwei THN-PE14M10 450W wins 1 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, JA Solar JAM54S31 415W or Tongwei THN-PE14M10 450W?
The Tongwei THN-PE14M10 450W wins this comparison by a narrow margin. It delivers more power (450W vs 415W). For most residential installations, the Tongwei THN-PE14M10 450W is the stronger choice.
Which panel is more efficient, JA Solar JAM54S31 415W or Tongwei THN-PE14M10 450W?
The both panels share 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 0.0 percentage points translates to approximately 35W per panel under standard test conditions.
Which has a better warranty, JA Solar JAM54S31 415W or Tongwei THN-PE14M10 450W?
The JA Solar JAM54S31 415W comes with a 12-year product warranty and 25-year performance guarantee. The Tongwei THN-PE14M10 450W offers 12-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The JA Solar JAM54S31 415W has a temperature coefficient of -0.34%/°C and the Tongwei THN-PE14M10 450W is -0.34%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many JA Solar JAM54S31 415W vs Tongwei THN-PE14M10 450W 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 18 Tongwei THN-PE14M10 450W panels (450W each). The Tongwei THN-PE14M10 450W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026