TOPCon vs HJT Solar Panels
Complete Technology Comparison
As a manufacturer producing both TOPCon and HJT modules, we give you an unbiased comparison to help you choose the right technology for your project.
TC
TOPCon — Best Value
Choose when budget optimization is priority
- + Lower cost per watt
- + Mature supply chain, easy to finance
- + 49% of global production — proven at scale
- - Higher temperature coefficient than HJT
HJ
HJT — Best Performance
Choose when energy yield maximization is priority
- + Best temperature coefficient (-0.24%/C)
- + 85% bifaciality — highest in market
- + Near-zero LID, best 25-year degradation
- - 5-10% price premium over TOPCon
Head-to-Head Comparison
| Specification | TOPCon | HJT |
|---|---|---|
| Cell Efficiency (mass production) | 25.5-26.5% | 26.0-27.0% ★ |
| Module Efficiency | 22.5-23.5% | 23.0-24.0% ★ |
| Temperature Coefficient | -0.29 to -0.30%/C | -0.24 to -0.26%/C ★ |
| Bifaciality | 75-80% | 80-85% ★ |
| First Year Degradation | < 1.0% | < 1.0% |
| Annual Degradation | 0.40%/yr | 0.35%/yr ★ |
| Year 25 Output | >= 87.4% | >= 88.8% ★ |
| Manufacturing Cost | Lower (PERC line compatible) ★ | Higher (new equipment needed) |
| Module Price ($/W) | Lower ★ | 5-10% premium |
| Production Capacity (global) | ~49% of market ★ | ~8% of market |
| Hot Climate Performance | Good | Excellent ★ |
| Low-Light Performance | Good | Excellent ★ |
| LID (Light Induced Degradation) | Very Low | Near Zero ★ |
| Supply Chain Maturity | Very Mature ★ | Growing |
| Bankability / Financing | Excellent ★ | Good (improving) |
★ = advantage in this category. Data from JUSTSOLAR product specifications, 2026.
Which Technology Is Right for You?
Choose TOPCon When:
- Budget optimization is the top priority
- Project is in temperate climate (< 35C ambient)
- Financing requires maximum bankability
- You need large volumes at competitive $/W
- Utility-scale ground-mount in moderate climates
- Distributor inventory for general-purpose sales
Choose HJT When:
- Project is in hot climate (> 35C ambient)
- Maximum lifetime energy yield is critical
- Customer demands lowest degradation rate
- Desert, Middle East, tropical installations
- 30+ year project horizon where degradation matters
- Premium residential or C&I where efficiency/m2 is key
Why Buy Both from JUSTSOLAR?
We are one of the few manufacturers producing both TOPCon and HJT modules in our own factory. This means you can source both technologies from a single supplier with consistent quality, unified logistics, and one point of contact.
4
Module options (600W-730W)
2
Cell technologies (TOPCon + HJT)
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