Hur placering av solceller kan bidra till att möta en byggnads effektbehov

Sammanfattning: The solar power accounts for only 0.2% of the Swedish power production in 2019. However, the solar power market is growing at a fast rate. Solar power production needs to be utilized instantly locally, for example in a building or else it is fed to the grid. Therefore, a challenge is how to utilize as much solar power as possible. This study aims to answer how solar panels should be placed in an optimal way in order to meet the load in a building similar to Vasakronan's property Kransen 2 in Uppsala. Two types of measures are used in the study to evaluate the solar power systems. The measure self-consumption describes the amount of solar production that is instantly used in a building. The measure self-sufficiency describes how much of the consumed solar power that covers the building's total load. The solar power production varies during the day. Therefore, the placement of panels affects the production profile during the day. The methodology in this study consists of a simulation model which provides optimal solar power systems regards to self-consumption and self-sufficiency. An economic model is also developed which calculates the payback time of solar power investments. The results shows that self-sufficiency is an important measure in order to increase the matching between a building's load and solar power production, and thereby reduce the proportion of purchased electricity from the grid. A solar power system should be optimized with regards to high self-sufficiency, and use the self-consumption to measure the amount of overproduction a system would have. A high self-sufficiency also provides a shorter payback time due to less amount of purchased electricity. The value and the relationship between self-consumption and self-sufficiency depends on the size of the system installed power.