The choice of PV panel technology influences energy production for the next 25+ years. Here is the objective comparison for the 3 main technologies of the 2026 market.
PERC (Passivated Emitter Rear Contact)
The technology mature which dominated the last decade.
- Efficiency: 21-23%
- Temperature coefficient: -0.35%/°C
- Annual LID degradation: ~0.5%
- Price: the smallest
- Manufacturer's warranty: 25 years 80%
Verdict: good for tight budgets or partial replacements of an existing system with PERC.
TOPCon (Tunnel Oxide Passivated Contact)
The natural successor to PERC, dominant in 2026.
- Efficiency: 23-25%
- Temperature coefficient: -0.29%/°C
- Annual LID degradation: ~0.4%
- Price: 8-15% above PERC
- Warranty: 25 years 87%
Verdict: best value for money in 2026. Standard recommendation for any new installation.
HJT (Heterojunction)
Premium for those who want the maximum.
- Efficiency: 24-26%
- Temperature coefficient: -0.24%/°C (smallest)
- LID degradation: almost zero (0.2%)
- Price: 20-30% above TOPCon
- Warranty: 30 years 88%
Verdict: ideal for warm climates (southeast Romania), where high temperature affects PERC/TOPCon. The premium investment pays for itself through higher production over 25 years.
Comparative table
| Criterion | PERC | TOPCon | HJT |
|---|---|---|---|
| Max efficiency | 23% | 25% | 26% |
| Coef. temperature | -0.35%/°C | -0.29%/°C | -0.24%/°C |
| Relative price | 1.00 | 1.12 | 1.30 |
| Lifetime | 25 years | 25-30 years | 30 years |
Our recommendation
For 90% of cases in Romania: TOPCon 450-560 W (LONGi, JA Solar, Trina). Combine with quality assembly structure and you will have zero problems for 25 years.
For large, commercial projects or very hot summer areas: HJT. See the range of panels EcoSolaris.
I live in an apartment block, how can I benefit from solar energy?
Congratulations, the article has all the important information. Compared to other sites, you are much more detailed
Hello! Prices are updated monthly on the website. For the offer valid today, we recommend you call us directly.
thanks, but those prices are definitely out of date now aren't they? with inflation..
Yes, our articles and tables are updated quarterly. We will notify you when new versions appear.
The article is very useful, thank you! I had these questions
Hello! For a 5kW system with a 10kWh battery, the total investment is around 7000-9000 EUR turnkey. We can make a detailed offer.
For an average house with a consumption of 15-20 kWh/day, we recommend a 5-6 kW single-phase inverter. The three-phase becomes useful only above 10 kW.
Hello! For a 5kW system with a 10kWh battery, the total investment is around 7000-9000 EUR turnkey. We can make a detailed offer.
Very clearly explained. You solved many of my doubts related to photovoltaic systems
I recommend ecosolaris, bought 2 times and zero problems
We are happy that we could help you. If you need technical advice, we are here!
For an average house with a consumption of 15-20 kWh/day, we recommend a 5-6 kW single-phase inverter. The three-phase becomes useful only above 10 kW.
I hope that the article reaches those who are still hesitating. 100% worth the investment
I hope that the article reaches those who are still hesitating. 100% worth the investment
Hello, I saw the article and I want a personalized offer. What email do I contact you on?
The article confirms why I chose photovoltaic 3 years ago. The best financial decision!