Dalarna University's logo and link to the university's website

Radiated electromagnetic emissions of photovoltaic systems causing interference with radiocommunication can pose a major barrier to further increase photovoltaic penetration. This is particularly critical close to sensitive infrastructures such as hospitals, airports and, military-, public- and commercial-communication facilities. To understand the electromagnetic emission impact of each component and installation detail, we performed systematic electromagnetic emission measurements on comparable commercial photovoltaic systems in the frequency range 150 kHz to 30 MHz. Our measurements indicate that photovoltaic systems with module optimizers are the main cause of increased electromagnetic emissions. The results indicate that the choice of a specific module type can increase electromagnetic emission from systems with module optimizers, while changes in cable management and earthing do not substantially affect electromagnetic emissions. For the module optimizer measurements, emissions were significantly increased when replacing aluminum framed half-cut modules with frameless bifacial glass-glass modules. The results are relevant for photovoltaic-system designers and installers, enabling them to build photovoltaic systems with acceptable electromagnetic emission level.