Photovoltaic system design for household needs

Cilj ovog rada bio je kroz programski paket PV SOL premium projektirati fotonaponski sustav za kućanstvo i provesti analizu isplativosti za četiri karakteristična slučaja. Prvi promatrani slučaj bio je da se na dostupnu krovnu površinu instalira sustav maksimalne snage. Takav sustav za promatrane objekte iznosi 18 kW. U drugom slučaju podloga za projektiranje fotonaponskog sustava bila je mjerenje potrošnje električne energije. Ovisno o potrošnji električne energije skaliran je fotonaponski sustav. Snaga skaliranog sustava iznosi 4,5 kW. Za potrebe ovog rada analiziralo se i kako pohrana utječe na investiciju i isplativost sustava. Tu su se promatrala dva sustava pohrane jedan snage 14,4 kWh i jedan dvostruko veći 28,8 kWh. Zaključno se može reći da su sustavi za pohranu u ovom trenutku skupi, dok je analiza pokazala kako najbrži rok povrata investicije ima skalirani sustav prema potrošnji od 4,5 kW. Investicija iznosi cca 35000 kn, a njen povrat je za sedam godina.The target of this paper was to design a photovoltaic system for the household and to conduct cost-benefit analysis for four distinct cases through the PV SOL program package. The first observed case was to install the maximum power system on the available roof surface. Nominal power of such system is 18 kW. In the second case, base for photovoltaic system design was measurements of household electricity consumption. Nominal power of such system is scaled according to the electricity consumption. Nominal power of such photovoltaic system is 4.5 kW. Furthermore, it is analyzed how energy storage influences the investment and cost effectiveness of the system. Two different systems were analyzed, first with one battery system of 14.4 kWh second with twice as big energy storage capacity of 28.8 kWh. To conclude, storage systems are currently unprofitable, while the analysis has shown that the fastest return time of investment is achieved for the system of 4.5 kW. The investment amounts to approximately 35,000 kn, while return of investment is seven years