## 3 Results and Discussions
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Month** & **Grid to PV** & **PV to Grid** & **PV Output** & **PV to Load** & **Total Consumption** \\  & **(kWh)** & **(kWh)** & **(kWh)** & **(kWh)** & **(kWh)** \\ \hline January & 76,770.78 & 7403.7 & 31,522.9 & 24,119.2 & 100,889.98 \\ February & 80,304.96 & 6832.38 & 21,206 & 14,373.62 & 94,678.58 \\ March & 61,365.15 & 20,488.17 & 49,093 & 28,604.83 & 89,969.98 \\ April & 60,535.08 & 30,949.26 & 69,777.1 & 38,827.84 & 99,362.92 \\ May & 59,863.71 & 42,601.29 & 87,498.7 & 44,897.41 & 104,761.12 \\ June & 47,418.87 & 59,718.12 & 96,587 & 36,868.88 & 84,287.75 \\ July & 52,793.97 & 75,794.43 & 119,046.9 & 43,252.47 & 96,046.44 \\ August & 52,915.41 & 54,856.38 & 101,145.9 & 46,289.52 & 99,204.93 \\ September & 54,096 & 40,251.84 & 75,979.4 & 35,727.56 & 89,823.56 \\ October & 66,092.34 & 22,342.2 & 54,352.9 & 32,010.7 & 98,103.04 \\ November & 82,574.37 & 4997.67 & 24,242.4 & 19,244.73 & 101,819.1 \\ December & 84,075.12 & 4633.35 & 25,067.3 & 20,433.95 & 104,509.07 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Transferred energy from the PV to the grid. Figure 9: The analysis of daily energy transfer on the 2 nd of August and 2 nd of February. example day, when the PV output power is at its maximum level, the batteries could be charged and discharged five times. Therefore, the technical and economic benefits of the battery PV system are much more evident in the summer months. SOC is a measurement of the amount of energy available in a battery at a given time, expressed as a percentage. Batteries are charged when PV power exceeds load demand during the day. While energy is transferred from PV to batteries, the SOC value of the batteries increases. When the demand for the load is higher than the PV power, the SOC value decreases as the batteries must provide the difference between demand and generation. The SOC value is low, especially at night and on days when radiation is low. To maximize the economic benefit, batteries meet the energy needs of the load not only at night but also during the day. The SOC of batteries can constantly change during the day depending on meteorological conditions and load demand. The monthly SOC values of the batteries are shown in Figure 10.  
In this study, the minimum SOC value of the batteries was determined to be 20%. To prevent deep discharge of batteries and to ensure longer battery life, the battery is prevented from discharging when the SCO reaches 20%. During the winter months, due to the short day length and the high number of cloudy days, the number of charge-discharge cycles of the batteries is much lower than in the summer months. While batteries can be charged only once a day in winter, they can be charged and discharged 3-4 times in summer. The annual average SOC value of batteries was determined as 63.4%. The amount of energy entering the battery in the first year was determined as 461,357 kWh/year, and the amount of energy used from the battery was 403,568 kWh/year. The energy need of the load is met by the grid, PV, or ESS. The monthly average energy amounts transferred to the load from different sources are shown in Figure 11. The highest energy transfer from PV to load was approximately 80,000 kWh in July and August, and the lowest energy transfer was approximately 7500 kWh in January, February, and December. In proportional terms, the PV supply is lower than the battery supply. The reason for this is that energy is transferred from PV to both the load, the batteries, and the grid during the day. The monthly average efficiency of the ESS system was calculated as 83.6%. Figure 10: Hourly average SOC (%). The energy generated by the PV power plant is distributed as follows: 24.25% to the load, 50.6% to the energy storage system (ESS), and 25.14% to the grid.