Michele Pellegrino, A. Matano, C. Privato and R. Schioppo *

ENEA Centro Ricerche, Localita Granatello. P. O. Box 32,1-80055 Portici (NA), Italy. tel:+39-81-7723-267, Fax:+39-81-7723-344; mail to Michele. pellearino@Dortici. enea. it *ENEA Centro Ricerche Area Sperimentale di Monteaquilone (FG), Italy

PV plants could be the cause of radio frequency (RF) conducted radiated emissions, namely electromagnetic signals, at both the levels of voltage and current, travelling along the electric cables. The problem can be even more relevant for the Building Integrated PhotoVoltaics BIPV applications since their closeness to the domestic activities; preliminary measurements have been carried out for pre-compliance purpose at the Research Centre ENEA on a small photovoltaic fagade, while the plant was being in operation, e. g. delivering power. The pre-compliance procedure is vey important since if the conducted radiations overcame the standard values the same levels of signals could likely be present in other parts of the electric circuit inside the building, giving unwilling interferences with the other connected appliances. Another kind of noise could generate because the size of the modules and the length of the connection cables could make the plant acting as receiving antenna, so capturing and then introducing foreigner RF electromagnetic signals inside the buildings, mainly local broadcasting radio stations. In our survey the effects of differently configured inverters have been analysed: in one case one by one module connected inverters and the more traditional single inverter for a module string, in the other.