S the penetration level of the renewable energy resources(such as wind, solar, fuel cells, etc) is increasing, dependence on these resources to support load demand in modern power distribution system is also growing. However, due to the intermittent nature of wind and solar resources, the reliability of distributed generation (DG) is a major concern. A backup battery, if integrated with these resources, may help to store the excess energy produced by them and deliver it whenever needed. A photovoltaic (PV) solar farm produces power during the day-time. However, it generates close to rated maximum power only during part of the day-time (late morning to late afternoon/early evening) hours. The power generation capacity of a solar farm also depends on the weather and the season, for example, during cloudy days the power output reduces significantly and in non-tropical country winters the daylight hours are less. On the other hand, the power generation from wind plants is generally more during nighttimes due to higher wind speeds.