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The article compares power gains from horizontal polycrystalline and vertical monocrystalline photovoltaic installations operating under identical, real-world conditions in the city of Olsztyn. The study was conducted between 1 October 2014 and 31 August 2017, excluding a monthly downtime period between 24 January 2016 and 2 March 2016 which occurred due to unexpected technical difficulties. The paper analyzes the long-term efficiency of monocrystalline and polycrystalline photovoltaic installations under the real...