Solar energy today symbolizes clean energy and sustainable progress. However, in the event of a fire, this “green story” can turn into an environmental threat – with the emission of chemicals, toxic gases, and significant material damage. Only comprehensive fire protection can ensure that photovoltaic (PV) systems remain a truly sustainable solution in the energy transition.
In this field, Zarja Elektronika has a pioneering role in the region. With more than 40 years of experience in fire detection and alarm systems, as well as its own development and production of fire alarm control panels – the only one in Southeast Europe – Zarja is today recognized as a knowledge-based company, a regional center of expertise and practical solutions in industrial fire protection.
Science in Practice – Live Test in Logatec
On August 27, 2025, Zarja Elektronika, in cooperation with ZAG (the Slovenian National Building and Civil Engineering Institute) and Protectowire FireSystems, conducted a unique real-life test at the ZAG Fire Laboratory in Logatec.
On a real roof structure, typical fire scenarios were simulated, caused by electrical arcs and flammable materials beneath the modules. CTI linear heat detectors (LHD) responded within 20 to 30 seconds—well before the fire became visible—thus confirming how early detection can prevent escalation and major damage.
Professor Grunde Jomaas, Head of the Department for Fire-Safe and Sustainable Built Environment (FRISSBE) at ZAG, emphasized:
– Reliable early detection can significantly reduce the consequences of fires on roofs with PV installations. Our tests show that detection is not only a matter of triggering an alarm but also of enabling timely and effective action before the fire spreads.
Brooke Fishback from Protectowire FireSystems presented the CTI (Confirmed Temperature Initiation) technology, which enables confirmation of thermal activation before the alarm is triggered, thereby reducing the possibility of false alarms and ensuring accurate detection under real conditions.
In addition to the experimental work, ZAG has also published a comprehensive guide on fire safety in PV systems, available in English, Croatian, and Slovenian, which highlights the importance of early detection and the safe design of rooftop solar installations.
Belgrade – Expert Presentation on Solar Power Plant Protection
Just a few days later, on September 2, 2025, Zarja Elektronika organized a professional presentation and discussion in Belgrade on fire protection for PV systems, together with partners Protectowire and BS PROJEKT 2009.
The event brought together designers, engineers, investors, and fire protection specialists. The results of the Logatec testing were presented, along with practical examples and recommendations for designing early fire detection systems.
In focus:
- Brutalism and Its Identity in the Era of Architectural Uniformity
- ABB Home Automation in the Service of Energy Efficiency
- Sustainability Certificates – Standards Shaping Modern Buildings Worldwide
A survey conducted among participants showed that one-third already had practical experience with fires in PV systems, while for most, this was the first time they had examined the topic in detail. Most companies still rely only on basic protection measures, indicating the need for modern detection systems.
Siniša Teodosić, Director of BS PROJEKT 2009, emphasized:
– The protection of photovoltaic systems on commercial buildings is now a priority. Together with Zarja and Protectowire, we can offer investors proven solutions in accordance with European standards and the results of real-life tests.
Representatives of the company Stop Shop, Miodrag Perović and Aleksandar Ranisavljević, who attended the testing in Logatec, added:
– For investors, it is crucial to see that the solutions are not just theoretical, but proven under real fire conditions, which builds confidence in the technology we implement in our projects.
From Research to Practical Recommendations
The knowledge gained during both events has been consolidated into the document Recommendations for the Design of Fire Detection and Alarm Systems in Photovoltaic (PV) Rooftop Installations – the first regional guide intended for electrical designers, system engineers, investors, and supervisory authorities involved in planning fire protection for PV systems.
The recommendations provide practical guidelines for designing and installing linear heat detection systems (LHD/CTI LHD), including component selection, layout, connection, and integration with control panels and power shutdown systems. The document is aligned with European and Slovenian standards (EN 54-14, EN 54-5, EN 12094-1) and supports the safe and consistent implementation of detection systems in PV projects.
Together with the ZAG guidelines for PV system safety, these recommendations send a clear message:
Early fire detection in PV systems is essential not only for protecting property but also for ensuring the sustainable and safe operation of solar infrastructure.
Zarja Elektronika
The story was published in Energy portal Magazine GREEN ARCHITECTURE
