Abstract
Over the last few years, rooftop solar PV system receives high interest due to its rapid cost reduction. Nowadays, installing the rooftop solar PV can help reduce overall electricity bill of the owner throughout the lifetime of the system. However, in some countries including Thailand, selling large amount of power output from the rooftop solar PV to the grid may not be allowed, due to the strict grid code. At present, price of battery is continuously decreasing. Consequently, installation of the rooftop solar PV with battery might solve this problem. Thus, this paper proposes a method to determine the optimal installed capacity of rooftop solar PV generation and the minimum required size of the battery which improve the cost-benefit from installing solar power generation without the battery.
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