  Pumping water using multiple energy sources is the ideal solution for
supplying of potable water in isolated or arid areas. In this paper, an
effective control and energy management strategy for a stand-alone
photovoltaic-batteries water pumping system for agriculture applications is
presented. The system is composed of photovoltaic solar panels as primary
energy sources, and Lead-Acid batteries as seconder energy sources to supply
the brushless DC motor and the centrifugal pump. The energy management strategy
uses an intelligent algorithm to satisfy the energy demanded by the motor, also
to maintain the state-of-charge of the battery between safe margins in order to
eliminate the full discharge and the destruction of the batteries. Drift is a
major problem in photovoltaic systems; this phenomenon occurs when the solar
irradiation changes rapidly. Classical MPPT algorithms do not solve this
problem, for this reason a modified P\&O has been implemented, the obtained
results shown the efficiency of the algorithm compared to the conventional
P\&O. Computer simulation results confirm the effectiveness of the proposed
energy management algorithm under random meteorological conditions.
