## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline
**Azimuth angle** & \(-90^{\circ}\) & \(-80^{\circ}\) & \(-70^{\circ}\) & \(-60^{\circ}\) & \(-55^{\circ}\) & \(-50^{\circ}\) & \(-45^{\circ}\) & \(-40^{\circ}\) & \(-35^{\circ}\) & \(-30^{\circ}\) & \(-25^{\circ}\) \\ \hline \(\overline{E}\) (kWh) & 7190 & 7480 & 7750 & 7990 & 8090 & 8190 & 8280 & 8350 & 8420 & 8470 & 8520 \\ Median (kWh) & 7415 & 7855 & 8275 & 8670 & 8840 & 8995 & 9150 & 9290 & 9415 & 9525 & 9605 \\ \hline
**Azimuth angle** & \(-20^{\circ}\) & \(-15^{\circ}\) & \(-10^{\circ}\) & \(-5^{\circ}\) & \(0^{\circ}\) & \(5^{\circ}\) & \(10^{\circ}\) & \(15^{\circ}\) & \(20^{\circ}\) & \(25^{\circ}\) & \(30^{\circ}\) \\ \hline \(\overline{E}\) (kWh) & 8560 & 8580 & 8590 & 8590 & 8580 & 8560 & 8540 & 8500 & 8450 & 8380 & 8310 \\ Median (kWh) & 9675 & 9730 & 9775 & 9785 & 9780 & 9755 & 9715 & 9650 & 9565 & 9460 & 9345 \\ \hline
**Azimuth angle** & \(35^{\circ}\) & \(40^{\circ}\) & \(45^{\circ}\) & \(50^{\circ}\) & \(55^{\circ}\) & \(60^{\circ}\) & \(70^{\circ}\) & \(80^{\circ}\) & 90\({}^{\circ}\) & \\ \hline \(\overline{E}\) (kWh) & 8230 & 8150 & 8050 & 7950 & 7830 & 7710 & 7450 & 7170 & 6870 & \\ Median (kWh) & 9220 & 9065 & 8905 & 8735 & 8555 & 8365 & 7965 & 7530 & 7080 & \\ \hline
**Month** & January & February & March & April & May & June \\ \hline \(\overline{E}_{m}\) (kWh) & 2200.32 & 4094.19 & 8758.71 & 12280.65 & 12567.74 & 12793.55 \\ \(\overline{\delta}\)(P) (kWh) & 52.38 & 84.16 & 143.67 & 129.42 & 69.67 & 52.78 \\ \hline
**Month** & July & August & September & October & November & December \\ \hline \(\overline{E}_{m}\) (kWh) & 13225.81 & 12325.81 & 9221.29 & 5361.61 & 2778.71 & 1868.39 \\ \(\overline{\delta}\)(P) (kWh) & 72.67 & 104.48 & 101.07 & 97.96 & 64.6 & 51.17 \\ \hline \end{tabular}
\end{table} 
Table 2: Average amount of energy (\(\overline{E}\) ) produced by PV system with different azimuth orientation and tilt angle \(35^{\circ}\), average energy produced per month (\(\overline{E}_{m}\) ). \begin{table}
\begin{tabular}{c c c} \hline
**Sum of Squares** & \(\mathbf{4.975\times 10^{8}}\) \\
**Coefficient of** & \(\mathbf{0.9314}\) \\
**Determination** & \(\mathbf{1.1680\times 10^{3}}\) \\ \hline Standard error of & \(\mathbf{1.1680\times 10^{3}}\) \\ arithmetic average & \(\mathbf{E}_{m}(t,\ \gamma)=A+B\cdot t+C\cdot\gamma+D\cdot t^{2}+E\cdot t\cdot\gamma+F\ \gamma^{2}\) \\ \hline Coefficient & Value & Minimum of the & Minimum of the \\ Range & Range \\ \hline A (kWh) & \(-2215\) & \(-2656\) \\ B (kWh\(\cdot\)month\({}^{-1}\)) & \(-2.104\) & \(-7.389\) & \(3.18\) \\ C (kWh) & 4965 & 4815 & 5116 \\ D (kWh\(\cdot\)month\({}^{-2}\)) & \(-0.1949\) & \(-0.2453\) & \(-0.1446\) \\ E (kWh\(\cdot\)month\({}^{-1}\)) & \(-0.009663\) & \(-0.7277\) & \(0.7084\) \\ F (kWh) & \(-396.7\) & \(-408\) & \(-385.4\) \\ \hline \end{tabular}
\end{table} 
Table 3: The statistical and regression characteristics of approximated polynomial function for three-dimensional dependence in Figure 14.  
From the results interpretation of the azimuth angle changes simulation on the PV system energy production, it is clear that the time is one of the most important factors. The amount of energy produced by the PV system varies from month to month when changing the azimuth angle of rotation from \(-90^{\circ}\) to \(+90^{\circ}\). The extensive data set will assess the impact in selected model months of the relevant season. The largest amount of electricity is produced in the summer months, specifically in July, where for the above azimuth angle range, the PV system is produced at least 12,000 kWh at \(+90^{\circ}\) orientation and 13,600 kWh at azimuth angle from \((-50\)-\(15^{\circ})\). It means change of energy production 11.76% in relation to the maximum energy production in July. It follows from the above facts that in the summer months the influence of the azimuth angle is minimal and the changes in the amount of produced energy is on average 12.18%.