Experts warn of dire risks from improper installation of rooftop photovoltaic systems

The growing popularity of rooftop photovoltaic (PV) systems in the Czech Republic is bringing new safety concerns, as experts warn that improper installation significantly increases the risk of fire. With more households and commercial buildings turning to solar energy, fire safety specialists and industry regulators are urging stricter oversight and better technical standards to ensure installations are safe and reliable.

According to fire protection authorities, the number of fire incidents involving photovoltaic systems, while still relatively low, has increased in recent years in line with the rise in installations. Investigations reveal that many of these fires are linked not to the solar panels themselves, but to installation faults — particularly in electrical connections, inverter systems, and cabling.

“The problem is not with the photovoltaic technology as such,” said Petr Doležal, a fire safety expert at the Czech Fire Protection Association. “Most often, the risk arises from improper installation — cables running too close to flammable materials, poorly executed connectors, or systems that are not properly grounded. These are avoidable mistakes that can have serious consequences.”

In some cases, PV systems are installed by companies or individuals lacking proper certification or electrical training. Industry representatives are calling for tighter regulation and mandatory certification for installers to reduce risks. The Czech Chamber of Renewable Energy has emphasized the importance of using qualified professionals and adhering to manufacturer guidelines and national safety standards.

Beyond the installation itself, maintenance plays a crucial role in preventing hazards. Dust, leaves, snow, and pests can all affect system performance and safety. Regular inspections and thermal imaging checks are recommended to detect overheating parts before a malfunction can lead to fire.

Insurance companies have also begun responding to the trend. Some are adjusting policies or requiring additional documentation for properties with rooftop PV systems. “We are not discouraging solar power,” said one insurance representative. “But we are advising homeowners to ensure systems are installed and maintained professionally to reduce risk.”

The Czech Ministry of Industry and Trade is currently reviewing its guidelines on photovoltaic installations, with the aim of introducing stricter quality controls and potentially making fire-safety inspections mandatory for larger systems. Officials also point out that while the risk exists, it can be effectively mitigated with proper planning, installation, and follow-up.

As demand for renewable energy grows, experts underline that safety must not be an afterthought. With photovoltaic systems becoming a common feature in residential neighborhoods, ensuring their safe integration into building infrastructure will be critical in maintaining public trust and preventing avoidable accidents.