Standalone solar power plants has its PV panels mounted on either building rooftop or flat land. They are hundreds of kilowatts to megawatt scale power plants designed to meet the requirements of power for certain days when sun is not available Standalone solar power plants are integrated with large number of battery storage. Power handling capacity of standalone solar power plants are enough to feed all energy needs at the site and recharge the batteries at the same time. They are the best solution for spacecraft, remote buildings, pumps, boats, road signs, radio towers etc. DC power generated by PV array is transmitted to inverter to feed the existing load and to the battery bank to store power to be used during night. A charge controller are incorporated in the system to avoid battery damage by excessive charging or discharging. Standalone solar power system suffers from high initial and maintenance cost of batteries.