According to European Union politics, Poland is expected to achieve at least 15% of the final energy consumption from renewable sources and to reduce 20% of greenhouse gases reduction in comparison to 1990. Among a variety of sources, (i.e. wind, biomass, geothermal, solar) energy conversion is one of the most promising solutions. The solar energy is clean and free. PV installations do not produce CO_(2)gas to the atmosphere and can be installed to any size based on individual energy demands. Besides, the investment costs for such systems drops every year. Above mentioned reasons cause a strong interest in small photovoltaic installations, and an increasing number of energy prosumers. Selling electricity to the grid in the present renewable energy legislation is not profitable. For this reason energy produced from PV installations should be consumed directly where is produced. This paper shows the results of the computer simulations and analysis of annual, winter and summer half year energy yield of photovoltaic system for a single-family house. Following orientations were taken into account: east-west, south. Effect of tilt angle of the modules integrated with building fa?ade was investigated. Economic and ecological aspects were analysed. DDS-Cad and PVSyst software were used for modelling and simulations.
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