In the thesis, we examined the level of energy self-sufficiency of buildings and the cost- effectiveness of a photovoltaic system in relation to the tariff system for electricity supply. In the first part of the thesis, we studied the design of systems for the self-sufficiency of buildings with electricity. We compared models for static and dynamic forecasting of electricity generated by the photovoltaic system. Both methods were used to determine the level of self-sufficiency of a selected building based on short-term annual data on electricity consumption. We used the matching factor of the electricity produced on the building and the electricity consumption in the building as the estimator. Furthermore, we studied the differences between the current and the predicted tariff system for the supply of electricity from the grid, using dynamic modeling of the photovoltaic system's operation. By applying the present value method, we determined the cost-effectiveness of various photovoltaic systems for the selected building. We found that dynamic modeling, which allows for the inclusion of the actual electricity consumption profile, must be used to evaluate the new tariff system. We identified the optimal photovoltaic system and the difference in electricity costs in island operation. For the selected case, the cost difference does not exceed 10%.
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