# Photovoltaic Prediction Software: Evaluation with Real Data from Northern Spain
## 5 Conclusions
However, these commercial programs present a more intuitive and simpler interface, in addition to having more pos  
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{\multirow{2}{*}{**Month**}} & \multirow{2}{*}{**RESTScreen**} & \multicolumn{6}{c}{**SAM**} & \multicolumn{6}{c}{**PVGIS**} & \multicolumn{3}{c}{**PVSYST**} \\ \cline{3-11}  & & & \multicolumn{1}{c}{_Isotropic_} & \multicolumn{1}{c}{_HDKR_} & \multicolumn{1}{c}{_Perez_} & SARAH_ & \multicolumn{1}{c}{_CMSAF_} & \multicolumn{1}{c}{_ER45_} & \multicolumn{1}{c}{_COSMO_} & \multicolumn{1}{c}{_New_} & \multicolumn{1}{c}{_Classic_} & \multicolumn{1}{c}{**PV’SOL**} \\ \hline Jan & **21.1\%** & \(-5.0\%\) & \(-0.2\%\) & \(1.8\%\) & \(9.8\%\) & \(-3.5\%\) & \(6.6\%\) & \(-3.8\%\) & \(0.6\%\) & \(1.0\%\) & \(18.1\%\) \\ Feb & \(2.2\%\) & \(-12.3\%\) & \(-87\%\) & \(-7.3\%\) & \(-1.3\%\) & \(-10.1\%\) & \(-5.1\%\) & \(-12.8\%\) & \(-5.4\%\) & \(-16.8\%\) & \(4.7\%\) \\ Mar & \(7.6\%\) & \(-9.0\%\) & \(-6.6\%\) & \(-5.4\%\) & \(2.1\%\) & \(-2.4\%\) & \(1.3\%\) & \(-6.3\%\) & \(2.6\%\) & \(-1.7\%\) & \(5.4\%\) \\ Apr & \(4.0\%\) & \(-6.1\%\) & \(-4.7\%\) & \(-3.5\%\) & \(-2.2\%\) & \(-7.2\%\) & \(1.3\%\) & \(-8.0\%\) & \(-5.0\%\) & \(-9.9\%\) & \(10.7\%\) \\ May & \(-1.9\%\) & \(-5.1\%\) & \(-4.5\%\) & \(-3.3\%\) & \(-4.8\%\) & \(-6.3\%\) & \(-3.2\%\) & \(-9.4\%\) & \(-7.4\%\) & \(-12.6\%\) & \(8.3\%\) \\ Jun & \(6.3\%\) & \(-1.1\%\) & \(-1.0\%\) & \(-0.1\%\) & \(-2.0\%\) & \(-3.4\%\) & \(-3.3\%\) & \(-7.2\%\) & \(-0.9\%\) & \(-9.3\%\) & \(10.9\%\) \\ Jul & \(1.5\%\) & \(-0.6\%\) & \(-0.3\%\) & \(0.7\%\) & \(-1.0\%\) & \(-1.6\%\) & \(-2.7\%\) & \(-8.1\%\) & \(-0.7\%\) & \(-12.9\%\) & \(12.4\%\) \\ Ago & \(0.5\%\) & \(-0.7\%\) & \(0.3\%\) & \(1.3\%\) & \(-0.5\%\) & \(-2.0\%\) & \(-1.8\%\) & \(-8.6\%\) & \(-1.3\%\) & \(-13.2\%\) & \(13.7\%\) \\ Sep & \(0.3\%\) & \(-9.6\%\) & \(-7.6\%\) & \(-6.7\%\) & \(-1.2\%\) & \(-2.7\%\) & \(-2.5\%\) & \(-13.0\%\) & \(-0.8\%\) & \(-12.6\%\) & \(6.0\%\) \\ Oct & \(-6.5\%\) & \(-7.9\%\) & \(-4.8\%\) & \(-3.8\%\) & \(0.3\%\) & \(-2.1\%\) & \(-1.0\%\) & \(-14.7\%\) & \(-1.8\%\) & \(-10.3\%\) & \(9.5\%\) \\ Nov & \(16.8\%\) & \(8.4\%\) & \(13.6\%\) & \(15.3\%\) & \(15.8\%\) & \(6.8\%\) & \(7.2\%\) & \(-7.0\%\) & \(10.2\%\) & \(-2.5\%\) & \(31.0\%\) \\ Dec & \(18.9\%\) & \(-12.6\%\) & \(-7.9\%\) & \(-5.3\%\) & \(28.8\%\) & \(16.1\%\) & \(17.1\%\) & \(2.6\%\) & \(16.0\%\) & \(-11.1\%\) & \(9.7\%\) \\ \hline
**Average** & \(5.9\%\) & \(-5.1\%\) & \(-2.7\%\) & \(-1.4\%\) & \(3.6\%\) & \(-1.5\%\) & \(1.2\%\) & \(-8.0\%\) & \(0.5\%\) & \(-9.3\%\) & \(11.7\%\) \\ \hline \multicolumn{1}{c}{**System 2 (1 Axis) [\%]**} & \multicolumn{6}{c}{**PVGIS**} & \multicolumn{3}{c}{**PVSYST**} \\ \cline{3-11}  & & & \multicolumn{1}{c}{_Isotropic_} & \multicolumn{1}{c}{_HDKR_} & \multicolumn{1}{c}{_Perez_} & SARAH_ & \multicolumn{1}{c}{_CMSAF_} & \multicolumn{1}{c}{_ERA5_} & \multicolumn{1}{c}{_COSMO_} & \multicolumn{1}{c}{_New_} & \multicolumn{1}{c}{_Classic_} & \multicolumn{1}{c}{**PV’SOL**} \\ \hline Jan & \(40.4\%\) & \(7.2\%\) & \(18.5\%\) & \(21.8\%\) & \(41.0\%\) & \(20.2\%\) & \(34.8\%\) & \(13.4\%\) & \(15.5\%\) & \(15.2\%\) & \(40.2\%\) \\ Feb & \(7.5\%\) & \(-6.9\%\) & \(1.1\%\) & \(3.3 sibilities of incorporating different formats of climatic bases, and extensive and updated elements libraries (PV panels, inverters, etc.). One of the main advantages of these systems is the possibility of modeling the installation in detail, considering many aspects, and with very good results. The most influential parameter in the simulation results was the climatic database for the area. PV*SOL presented high but very consistent errors, above 10%. The model may therefore be calibrated to adjust to a set resolution. The higher failure rate and safe position of the solar trackers reduce the amount of energy that is generated when there is a lot of wind. This aspect, which is difficult to predict, means that the results of all the simulations showed large differences with respect to the real production data.