N. H. Bustamam and M. N. Abdullah, “Battery System Sizing for 6.9 MWp Grid- Connected Photovoltaic System in UTHM”, EEEE, vol. 3, no. 2, pp. 425–433, Nov. 2022, Accessed: Jul. 18, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/8644