TOPCon vs PERC Solar Panels — 2026 Comparison
TOPCon and PERC are the two dominant solar cell technologies in 2026. TOPCon is newer with higher efficiency, while PERC remains the cost-effective workhorse. Which should you choose?
| Metric | TOPCon | PERC |
|---|---|---|
| Cell Type | N-type | P-type |
| Efficiency | 22-24%+ | 20-22% |
| Temperature Coefficient | -0.30%/°C | -0.35%/°C |
| First-year Degradation | <1% | 2-2.5% |
| Annual Degradation | 0.35-0.4% | 0.5-0.55% |
| Power Warranty | 25-30 years | 25 years |
| Positioning | Mainstream N-type | Legacy P-type |
| Low-light Performance | Excellent | Good |
| Bifacial Potential | Up to 80% | Up to 70% |
| Market Share 2026 | 55%+ | 35% |
Expert Verdict
TOPCon wins for 2026+ projects. Despite a small upfront premium, it delivers 10-15% more lifetime energy due to higher efficiency, lower degradation, and better temperature performance. PERC inventory across the industry is clearing out — JUST SOLAR has fully transitioned to TOPCon + HJT, so for new orders we recommend going straight to N-type rather than buying fading PERC stock.
Want a specific quote?
JUST SOLAR main lineup is TOPCon + HJT (100W – 740W), with BC full-black as a premium residential option, plus LONGi Tier-1 Hi-MO via our authorised-distributor relationship. Tell us your project (TOPCon vs PERC) — Frank will email a formal Proforma Invoice within 24 hours.