In order to demonstrate the profitability of the photovoltaic installation, it was assumed that the average price of electricity (including electricity sales and distribution fee) in 2020 was 0.5622 PLN/kWh, and its year-on-year increase will be 3.5% [23, 35].
As the installation has a power of less than 10 kW, 80% of the electricity previously fed into the grid can be obtained for free from the discount system [12, 13]. For the economic analysis it was assumed that the efficiency of photovoltaic panels decreases with time and the energy production decreases by 0.8% year on year .
The photovoltaic installation from the moment of commissioning, i.e. from November 26, 2020 to December 31, 2021, produced 9383.2 kWh of electricity (Fig. 1). During the first year of operation, the installation generated 9201.05 kWh of energy . Fig. 1.
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