Acknowledgements
It is gratefully acknowledged that this work has been supported by INA d.d. The support of Croatian Science Foundation (HRZZ) through the collaborative project “Optimization of renewable electricity generation systems connected in a microgrid” (grant No. 08/40) is also gratefully acknowledged. Authors also appreciate the helpfulness of the NASA Langley Research Center, Atmospheric Science Data Center, Surface meteorological and Solar Energy (SSE), which provided the data for this research through their web portal supported by the NASA LaRC POWER Project. Our gratitude also goes to Dr. Hrvoje Cajner, assistant professor at the University of Zagreb, Faculty of Mechanical Engineering & Naval Architecture, and Dragomir Pavković, dipl. ing. from INA-Industrija nafte d.d. Zagreb for many useful discussions and critical assessment of initial results. Finally, we would like to thank the unknown reviewers whose remarks have helped us to improve the quality of the presented subject matter.