Performance analysis of 3.9 kW grid connected photovoltaic systems in Kosova

This paper presents results obtained from monitoring a 3.9 kW_p grid connected photovoltaic system installed on a flat roof of a laboratory building of FECE in Prishtina, Kosovo (Latitude 42.6667°N and longitude 21.1667°E). System was monitored between the May 2013 to November 2013, and all the electricity generated was fed into the low voltage network supply to the building. This system consists of two types of photovoltaic modules, monocrystalline and polycristalline, inverter, and devices for measurement and monitoring. During this period are measured and analyzed daily and monthly parameters of system, such as: power generation, daily solar radiation, air temperature, PV module temperature and wind speed. Monthly average daily performance parameters of the PV systems evaluated include: final yield, reference yield, system efficiency, and performance ratio and capacity factor. These results will be enabling to evaluation and used the photovoltaic systems in Kosovo climatic conditions.