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Grid integration of rooftop solar systems are increasing at a rapid pace throughout the world. Battery energy storage has become integral part of rooftop solar systems, as it provides a mean to best utilize the solar energy. Since, the battery performance degrades in the course of its utilization based on the nature of use (charging, discharging pattern and temperature) and it is one of the most expensive component of a rooftop solar system, its charging and discharging operation is required to be regulated in a judicial manner. Therefore, it is imperative to study the performance of rooftop solar batteries based on its actual charging and discharging profile that reflects the intermittency in solar irradiation and households electricity consumption pattern. This paper presents a generic methodology using Monte-Carlo simulation approach to evaluate performance of solar batteries considering uncertainties in solar and energy …