The selection of the PV and the battery sizes were based on the 25 power required by the control system and DC water pump.
The required motor torque was estimated experimentally to be 100 Nm. Based on this torque, a 12 V motor unit of 0.75 RPM was found suitable for the tracking mechanism. A sprocket and chain system was used to connect the motor unit with the main tracking shaft as shown in Figure 5. The motor power consumed during system operation was measured to be 2.2 W.