# Review on Optimization Techniques of PV/Inverter Ratio for Grid-Tie PV Systems
## 2 Literature Review
### PV Array to Inverter Sizing Strategies
#### 2.2.3 A Climate Classification  
This work analyzes the sizing ratio and is divided and compiled into several main climatic types based on the Koppen-Geiger climate classification to formulate the current problems based on a number of investigations, as shown in Table 3.  
The stipulation of reactive and active powers of the presented economic cost was also considered in relation to the systematic technique in calculating the best sizing of the inverter. Additionally, as shown in Table 4, other field studies were conducted in relation to the size ratio theory and formulated values considered in publications by third parties worldwide divided into climatic regions. \begin{table}
\begin{tabular}{p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt}} \hline \hline
**Optimal Power Ratio** & **Method/Relation** & **Recommendation** & **Climate Classification** & **Country/Group** & **Ref.** \\ \hline \hline \multirow{6}{*}{1.50–1.00} & & SI; r = 1.5 medium efficiency inverter, r = 1.2 & & \\  & & high-efficiency inverter, r = 1.10 medium and low-efficiency inverter, r = 1.00 high and medium efficiency inverter. & & \\ \cline{1-1}  & & r = 1.00 high and medium efficiency inverter. & & \\ \cline{1-1}  & & r = 1.00 high and medium efficiency inverter. & & \\ \cline{1-1}  & & r = 1.00 high and medium efficiency inverter. & & \\ \hline
0.71 & \(\frac{P_{\mathrm{max,norm}}}{P_{\mathrm{Y},\mathrm{Y},\mathrm{norm}}}=\frac{G_{ \mathrm{FIL}}}{G_{\mathrm{SIC}}}\) & 0.71 & Csb & Eugene, OR, USA & [14] \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Studies in relation to the sizing ratio theory and values considered in publications by third parties worldwide divided into climatic regions. \begin{table}
\begin{tabular}{p{56.9 pt} p{113.8 pt} p{113.8 pt}} \hline \hline
**Climate Classification** & **Country/Terriroy with the Weather** \\ \hline \hline \multirow{3}{*}{Dfb} & & Humid continental climate, warm summer; at least four months averaging above 10 \({}^{\circ}\)C, all months with average temperatures below 22 \({}^{\circ}\)C, and coldest month averaging below 0 \({}^{\circ}\)C (or \(-3\)\({}^{\circ}\)C). \\ \cline{1-1}  & & Mediterranean climate, warm summer; the driest month of summer receives less than 40 mm, at least three times as much precipitation in the wettest month of winter as in the driest month of summer, all months with average temperatures below 22 \({}^{\circ}\)C, at least four months averaging above 10 \({}^{\circ}\)C, and coldest month averaging above 0 \({}^{\circ}\)C (or \(-3\)\({}^{\circ}\)C). \\ \hline \multirow{3}{*}{Cfb} & & Subtropical highland climate or temperate oceanic climate; at least four months averaging above 10 \({}^{\circ}\)C, all months with average temperatures below 22 \({}^{\circ}\)C, and coldest month averaging above 0 \({}^{\circ}\)C (or \(-3\)\({}^{\circ}\)C). \\ \cline{1-1}  & & No dry months in the summer. No significant precipitation difference between seasons. \\ \cline{1-1}  & & Humid subtropical climate; at least four months averaging above 10 \({}^{\circ}\)C (50 \({}^{\circ}\)F), at least one month’s average temperature above 22 \({}^{\circ}\)C (71.6 \({}^{\circ}\)F),and coldest month averaging above 0 \({}^{\circ}\)C (32 \({}^{\circ}\)F) (or \(-3\)\({}^{\circ}\)C (27 \({}^{\circ}\)F)). \\ \hline \hline \multicolumn{3}{p{56.9 pt}}{} \\ \hline \hline \multicolumn{3}{p{56.9 pt}}{} \\ \hline \hline \multicolumn{3}{p{56.9 pt}}{} \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Climate classifications and their weather descriptions. \begin{table}