*3.1. PV Electricity Production*

According to HOMER software, the output of PV panels was calculated with the employment of Equation (1) [49].

$$PPV(\tau) = YPV \cdot FPV \cdot \frac{Gh(\tau)}{GSTC} \cdot \left(1 + \alpha p \cdot (T\mathcal{C} - TSTC)\right) \tag{1}$$

where


Equation (2) presents the PV cell temperature that is the temperature of the surface of the PV installation [52].

$$TC = Ta(\tau) + Gh(\tau) \cdot \frac{TC.NOCT - Ta.NOCT}{G.NOCT} \left(1 - \frac{\eta\_c}{ta}\right) \tag{2}$$

where


Unit productivity of PV installation arrived at by multiplying the power output of photovoltaic panels and the average efficiency of the inverter and electric installation (Equation (3)).

$$LIPVP\left(\tau\right) = PPV\left(\tau\right) \cdot 1 \, h \cdot \eta\_{inverter} \tag{3}$$

where


The value of *UPVP* was used to calculate the unit electricity production (*YUPVP*) in a photovoltaic installation per year (Equation (4)). Additionally, the annual electricity production from a PV installation (*YPVPI*) is given in Equation (5), 30-years electricity production from a PV installation (30*YPVPI*) including yearly efficiency loss factor is given in Equation (6).

$$YUPVP(year) = \sum\_{\tau=1}^{8760} UPVP(\tau, year) \tag{4}$$

where


$$YPVPI(year) = YIPVP(year) \cdot PI \tag{5}$$

where


$$39YPVPI = \sum\_{year=1}^{30} YLPVP(year) \cdot (1 - yl \cdot (year - 1)) \cdot PI \tag{6}$$

where


The value of the subsidy for produced energy (UDPV, euro/MWh) was calculated as follows (Equation (7)):

$$MDPV = \frac{DI}{\sum\_{year=1}^{30} YPVPI(year)}\tag{7}$$

where

