## 4 Measured Power Generation Performance of the BIPV System  
The power generation performance for each array was analyzed using the measured data for one year in 2012. Figure 3 shows the final yield, the system loss, and the capture loss according to each array.  
Regarding the final yield, SI 30\({}^{\circ}\) showed the highest final yield at 3.03 h/day, followed in order by HR 0\({}^{\circ}\) (2.72 h/day), SV 90\({}^{\circ}\) (1.85 h/day), and WV 90\({}^{\circ}\) (1.36 h/day). SI 30\({}^{\circ}\), which is the installation condition for receiving a high accumulated irradiation, showed the highest final yield. The capture loss and system loss also showed the same tendency as the final yield analysis results. SI 30\({}^{\circ}\) showed the highest capture losses of 0.55 h/day, followed in order by HR 0\({}^{\circ}\) (0.53 h/day), SV 90\({}^{\circ}\) (0.43 h/day),  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Electrical Data for Standard Test Conditions (STC)** \\ \hline Voltage at Pmax (Vmpp) & 59.6 (V) \\ Current at Pmax (Impp) & 0.74 (A) \\ \hline Module efficiency & 5.03 (\%) \\ \hline \multicolumn{2}{c}{**Temperature coefficients**} \\ \hline Power & \(-\)0.39 (\%/\({}^{\circ}\)C) \\ Short Circuit Current & 0.056 (\%/\({}^{\circ}\)C) \\ Open Circuit Current & \(-\)0.35 (\%/\({}^{\circ}\)C) \\ \hline \hline \end{tabular}
\end{table}
Table 2: _Cont._  
Figure 3: Annual yield and loss of each array.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Input Data** & \\ \hline Maximum PV power & 3300 (Wp) \\ Operation PV voltage range & 190–600 (Vdc) \\ MPPT voltage range & 190–500 (Vdc) \\ Max PV current & 16 (A) \\ \hline \multicolumn{2}{c}{**Output Data**} \\ \hline Maximum continuous power & 3000 (W) \\ Maximum efficiency & 94.5 (\%) \\ Euro efficiency & 93.0 (\%) \\ Operating line frequency & 60 (Hz) \\ Nominal line voltage & 220 (V) \\ Line current (max)/line & \textgreater{}0.99 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Specifications of the power conditioning system. MPPT: maximum power point tracking.  
and WV 90\({}^{\circ}\) (0.33 h/day). Regarding the system losses, SI 30\({}^{\circ}\) showed the highest system loss (0.82 h/day), followed in order by HR 0\({}^{\circ}\) (0.66 h/day), SV 90\({}^{\circ}\) (0.45 h/day), and WV 90\({}^{\circ}\) (0.34 h/day) in descending order.  
Figure 4 shows the analysis results of the ratio of the final yield to the reference yield (PR) and the ratios of the system loss and capture loss according to the installation conditions. In the annual PR according to the installation condition, HR 0\({}^{\circ}\) showed the highest PR (69.5%), followed in order by SI 30\({}^{\circ}\) (69.0%), SV 90\({}^{\circ}\) (67.8%), and WV 90\({}^{\circ}\) (66.8%). The PR did not exceed 70% under any installation conditions. Therefore, the power generation performance was lower than that of the PV system reported in a previous study of International Energy Agency (IEA) [30]. In addition, the ratios of the system loss were relatively higher than the results of a previous study [7] that analyzed the power generation performance of the BIPV system, to which the same module and inverter were applied. In other words, it was presumed that higher system losses compared to those of other systems led to performance loss.