https://www.mdu.se/

The purpose of this exam thesis is to determine to which extent can a photovoltaic system and a battery system affect power peaks. By reducing the power peaks, it will lead to a reduction in the consumer monthly cost and a balanced electrical load. The methodology for the study of the photovoltaic system was to use PVsyst as a simulation program to obtain the solar production that was generated for all grocery stores. When this solar production was obtained, the photovoltaic systems at the grocery stores have been dimensioned so that there would be no surplus of solar production, this was done because self-consumed electricity is worth more than the sold electricity. The methodology for the battery system was to evaluate calculations and dimension the battery size based on how the value for reduced power and energy value increased. Subsequently, a profitability analysis could be performed to determine whether a photovoltaic system and a battery system are profitable from an economic perspective. The results showed that the power peaks can be reduced with the help of photovoltaic system but not to the extent that the work has hoped for, this was due to grocery stores had a power peak early in the morning when the sun could not generate much. In addition, it turned out that the power tariff accounts for less than 9 percent of the total value of self-consumed solar value for all stores. The payback time varies from 14 years and up to more than 30 years, the value of self-consumed solar value varied between 0,8 – 0,99 kr/kWh and LCOE varied between 0,56 – 0,86 kr/kWh. Furthermore, the result also showed that the present value increases the most when the value of self-used solar value increases and when the real discount rate decreases, the least impact had power tariff tax. The results for the battery system of 7,5 kWh showed that it was significantly better at reducing power peaks, the production cost of the battery system was 2,13 kr/kWh with 60% in investment aid. Battery systems were not profitable because the value of reduced power and energy value was 1,42kr/kWh in 2018 and 1,44kr/kWh in 2019. The general conclusion in the work was that an investment of photovoltaic system is profitable, however the photovoltaic system could not reduce the power peaks effectively. Regarding batteries, it is concluded that it is very effective to reduce those power peaks, but not profitable due to the very high investment cost.