In this paper the theoretical and experimental investigations for both steady-state and
dynamic operation of dc-dc Cuk converter powered a separately excited dc motor are
presented. The analysis is extended to the photovoltaic generator supply. The effect of
duty ratio for different irradiation levels on the motor performance is obtained. The relation
between solar irradiation level and converter duty ratio to ensure maximum energy
utilization is given. The maximum photovoltaic generator can be obtained by adjusting the
converter duty ratio for certain irradiation levels with a pump load. The proposed system
can be utilized in spray irrigation and green house water supply management.