Solar Power at Bobygget
Abstract: During the autumn of 2014 a project called Bobygget was initiated. The purpose of the project is to establish a future residential area in Herrljunga, where a sustainable and environmentally compatible lifestyle is fundamental. The purpose with this bachelor thesis was to, in consultation with Herrljunga Elektriska, investigate to what extent Bobygget could be self-sufficient from solar energy. Through PV systems at rooftops connected to a shared battery, a given ratio between produced energy and consumption in the area could be acquired. Calculations and simulations resulted in the required amount of bought energy for Bobygget as well as the potential sold energy to the grid. On account of a limited budget, this report was based on three different scenarios with different economic presumptions. The economic presumption for each scenario determined the capacity of the battery, which had an impact on the grade of yearly self-sufficiency. The first scenario resulted in a battery capacity of 63.2 kWh which gave a self-sufficiency of 27 %. In the second scenario the battery had a capacity of 328 kWh which resulted in a self-sufficiency of 50 %. Since the third scenario had an unlimited budget, the capacity of the battery was determined by 100 % utilization of the produced energy. Therefore the battery acquired a capacity of 58 000 kWh which gave a self-sufficiency of 79 %. Consequently, Bobygget could not be completely self-sufficient by installing PV systems at rooftops regardless of budget and capacity of the battery. To be able to accomplish a self-sufficiency of 100 % an alternative solution is necessary.
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