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  • 1.
    Johansson, Kristoffer
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Solceller på flerbostadshus2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden has taken upon themselves several goals to reduce their carbon footprint and exchange fossil fuels for renewable energy sources; Solar power will play an important part in fulfilling these goals. Due to declining costs and a technology that is getting more efficient solar power has seen a rampart growth is system installation the last couple of years. However, often economic support schemes are necessary for making a PV-system profitable, especially in Sweden where the sun doesn’t shine as much. Electricity generation with the use of PV-systems on buildings can be unreliable because the sun might not shine when the building needs the electricity, and the opposite is also a problem where the sun is shining, but the building doesn’t need electricity.

    The main purpose of this of this study was to evaluate the possibilities of a PV-system on two large residential buildings located in Sweden, Umeå. The study was conducted by gathering data about the buildings through measurement, pictures and investigation. With the data acquired a total of five different PV-systems was dimensioned to be tested for performance. The software PVGIS was used to analyze the PV-system performance by making use of climate data to simulate the weather conditions in Sweden. Thereafter the PV-systems economical prerequisites were analyzed by calculating LCOE, payback, present value and IRR.

    The results show that there are possibilities to install PV-systems on the buildings, but if larger systems are to be installed it seems like a battery is needed. If two smaller PV-system of total 113 kWp is installed the study suggest that relatively high levels of power self-sufficiency can be achieved. This is believed to be caused by the very constant electricity loads in the buildings. The energy output per kWp of installed power reaches 775 kWh/kWp on the best roof surfaces and is drastically lowered on the worst surfaces. Such energy exchange is considered low. The economical investigation shows that PV-systems that can use a lot of the produced electricity directly in the building instead of selling it to the public powerline has more profitability.

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