Solceller på idrottshallar : en lönsamhetsstudie med Knislinge sporthall som utgångspunkt

Sammanfattning: This report aims to examine the economic conditions of photovoltaic systems in sports halls. It also intends to examine if it is economically viable to use the excess production from the solar electricity to heat up a hot water storage tank instead of selling it into the grid. This will be answered by studying Knislinge sports hall. Two different configurations of the solar system were investigated. A grid connected system where all the excess production is sold at spot price to the grid and a system with a hot water storage tank. The storage tank is heated by electrical heaters that get their electricity from solar energy. The solar electricity will primarily go to the regular consumption of electricity in the sports hall and secondly, when there is excess production simultaneously as the storage tank is not fully loaded, to the storage tank. If there is excess production while the storage tank is fully loaded the electricity is sold into the grid. PVsyst has been used for simulation of solar power generation, where a model of the sports hall, and the surrounding area, has been constructed. Hourly values of the solar power generation have been compared with hourly data of electricity consumption. The consumption has been derived from electrical blueprints in combination with schedule from the previous year. To compare the profitability between the two configurations a LCC analysis has been established. Results from the simulation shows that the solar cells produce a total of 48 MWh a year. Electricity consumption has been estimated at 104 MWh a year. Comparison of hourly values for solar power generation and electricity consumption shows that the excess production is 20 MWh a year. The excess production is this high because the sports hall is closed during the summer while the solar cells still produces electricity. The result of the LCC analysis for Knislinge sports hall shows that the present situation requires investment support for the solar cells to be profitable. The cost of solar cells has decreases in recent years, if this continues it could be profitable without investment support within the near future. If the proposition regarding the tax reduction of sales from renewable electricity is going through, the investment becomes even more profitable. The result also shows that the alternative to send the excess production from the solar electricity to a storage tank is to be preferred over selling it into the grid.