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With the purpose to ensure extra solar power for buildings and improve quality of urban environment solar power has appeared to be sought-after in the majority of southern countries. In the case of the Northwest Region of Russia estimation of existing regional power reserves for construction sector is the fundamental factor when an issue of achieving possible ways to supply buildings with solar-based power is considered. The article deals with the methods and calculations made to obtain the data on solar radiation effects on sloping surfaces oriented in different cardinal directions in regard to Saint-Petersburg weather-related conditions. Electric power generation using solar photovoltaic modules (PV modules) has been defined under actual operating conditions.

Pre-school facilities are considered to be specific buildings in the matter of construction and renovation. Space-planning features in design for pre-school facilities create special conditions for solar power use to ensure heat and power supply. The article deals with estimation of incoming solar power in reference to the surfaces oriented in different cardinal directions under the weather conditions of the city of Saint-Petersburg (Russia) and the city of Nish (Serbia). A model of how to ensure power supply for a kindergarten of the city of Nish is presented on the basis of the calculations analysis. The cases with regard to completed projects designed to use renewable energy sources in order to supply pre-school facilities with energy in other weather conditions are given herein.

This paper presents an approach to the correct calculation of the hourly power output of solar photovoltaic installations (SPVI) with multijunction solar cells (MJ SCs) and a sunlight concentrator. The MJ SC efficiency values variations depending on spectral compositions of incident sunlight have been considered. To take into account the effect of the changing SPVI efficiency value on the hourly installation power output calculated, the hourly and yearly sum totals of generated power have been determined.It was shown that the use of the constant efficiency values of MJ SC compared to variable ones leads to an erroneous overstating of the value of SPVI yearly generated power in the range from 6 to 12%, which may affect the correct choice of the optimal structure and parameters of an independent power supply system and its reliability in supplying power to a customer.

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