The paper aims to perform a comparative analysis regarding the testing results achieved on an experimental model of counter rotating wind turbine with a rated power of 1 kW for a wind velocity of 10 m/s. The experimental model is consisted of a system of two rotors which rotate in opposite directions - one rotor is rotating in clockwise direction and the other in counter-clockwise direction - and one unique electrical generator, which adds-up the rotation of both wind rotors. The ratio between the two diameters is 1.08, the up-wind rotor being slightly larger than the down-wind one. The experimental model is provided with a three-phase synchronous electric generator with counter rotating armatures, having the power of 1.6 kW, 3x24 V, at 750 rpm. This type of generator is characterized by a reduced size, increased rotational speed and no losses due to movement transmission. The experiments on the wind turbine system have been performed both in a wind tunnel as well as in situ, in a location nearby Iasi city, Romania, where the turbine has been installed. The paper focuses on investigating the operation of the system both in controlled test conditions and in real conditions, when wind changes its velocity and direction. In order to determine the effect of these variations, the wind turbine system has been tested at different wind velocities, up to 10.5 m/s in the wind tunnel and up to 8.7 m/s in free air stream. The in situ testing has been performed also in order to validate the results obtained on the experimental model of counter rotating wind turbine system within the wind tunnel. There has been noticed a good consistency between the two sets of experiments, resulting that the procedure is suitable to be further applied in designing a 10 kW wind turbine prototype.