This paper presents an implementation of maximum power point tracking control in a single phase utility interconnected photovoltaic inverter. The control algorithm is based on the perturbation and observation method, and realized by a PIC microcontroller which controls the entire supervisory task in the system. To operate P&Q algorithm properly a PV voltage control loop is added. The characteristic performance of the MPP algorithm is obtained by simulation and verified by experiments. Daily operation results are also included.