Optimization of Single Pump System A single pump system consists of only one pump, a power -matched solar array and an inverter . The aim of optimization is to use PV modules as less as possible on the promise of filling the requirement of head and capacity. The rotational speed of pump is regulated according to the sunshine on the solar array; when the intensity of sunlight reaches peak, the pump runs at the rated speed, and the output approaches the peak power of the solar array; when the sunlight is not abundant, the speed of pump is lower than rated speed; when the speed as low as the capacity becomes zero, the system stops working. So, there are big differences between solar pumping systems and traditional pumping systems in system design, and the system should be optimized according to the requirements of head, capacity, and local conditions of sunlight. ·Determine the optimal average daily operating time and the range of speed governing. ·Choose the optimal head and capacity of the pump. ·Determine the maximum power of PV modules, the best working voltage and method of connection.