Analysis of the Efficiency of a Stand-Alone PV System for Powering of a Detached House in the Village of Nikolovo, Bulgaria

In the present study the possibilities for application of stand-alone PV systems for powering of detached houses located in agricultural areas are analyzed. The environmental conditions of a village near Ruse, Bulgaria and a typical seasonal load profiles are considered. The PV system is sized using the PVsyst 7.1 software for 45° tilt angle, southern orientation and 2 days of autonomy. The average unused energy varies from 0.5 to 3 kWh/kWp/day, which corresponds to 33% of the produced PV energy. The study also analyzes the possibilities for utilizing the excess energy in processes with variable load profile. Considering the geographic location of the house, the possible applications include pumping of irrigation water, climatization of greenhouses, outdoor lighting, etc.