(3) The average energy consumed by the motors can be estimated
0.56Wh/day. This energy represents the average
value that the system must use at sunrise to move the installation
to the west position at sunset.
(4) The wind-tracker consists of a 2W
electrical motor, which is
able to rotate on its axis with a rotation speed of 2 rpm.
(5) According to the statistical studies of monitoring days, the
electrical motor is working for 1.66 min per day.
(6) The energy used by the wind-tracker, is almost
0.11Wh/day.
(7) For realizing a simple and low cost tracking system, the useful
energy can be defined as the ‘‘net’’ energy, expressed as
the difference between the produced energy and the energy
consumed by the tracker auxiliaries [4]. As a result, the net
energy produced by the hybrid sun–wind-tracker can be
estimated around 25.76Wh/day.