A technical review of existing off grid solutions with different scales in Finland

Abstract

This bachelor's thesis discusses a hypothetical photovoltaic off-grid power generation system for a 49-square-meter summer house in a remote area outside Lappeenranta, Finland, which is only used for the summer months of June and July. Assuming that it is too far away from the transmission point and the cost of grid connection is high, off-grid power generation has become an option. The article discusses the types and background of each component in the system and the selection of some components. And it was finally determined that the battery capacity required when the average daily load is 3.94kWh, the number of autonomy days is 4 days, is 1207.13Ah, the photovoltaic module power is 1.44kW, and the inverter power is 5.12kW. Corresponding cost and economic benefits issues are also discussed.