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In this research an iterative method for determining the optimal sizing of standalone photovoltaic (PV) system in terms of optimal sizing of PV array and battery storage is proposed. A standalone PV system energy flow is first analysed using a developed model for a standalone PV system. In finding the optimal size of PV array and battery, a long term data (1975-2005) is considered for Malaysia. Based on the results of the designed example for a PV system installed in Kuala Lumpur, the proposed method gives satisfactory optimal sizing results.