NOVELTY - The device (1) has a rotor with vertical rotation axis and carrying two radial panels (3) distributed in a homogeneous manner around the rotation axis of the rotor. Inclining units are used to incline the panels from a deployed position up to a folded position such that height of the device is lower in the folded position than that of height in the deployed position. The inclining units have pivot axles (5) on which the panels are fixed at a level of a lower end of the panels. The panels are fixed on a body (9) of the rotor by an intermediary of the pivot axles.    USE - Savonius/Darrieus type wind power device i.e. wind turbine, for mounted on a roof of a vehicle (claimed) e.g. motor vehicle and camping car, to convert wind energy into mechanical or electrical energy.    ADVANTAGE - The device with the vertical axis can be easily deployed and can be easily folded up to minimize obstruction and arrangement on the roof of a vehicle. The design of the device enables tilting the panels of the wind turbine to the vertical axis in the deployed position in which the panels are parallel to the vertical axis of rotation of the wind turbine, and a folded position in which the panels are inclined with respect to the deployed position, so that the panels are placed horizontal or perpendicular to the axis of rotation of the wind turbine, thus modifying the relative orientation of the panels without obstruction. The design of the device enables mounting a rotor of the device on a telescopic mast and coupling the panels to increase or decrease the height to facilitate retraction and arrangement in a storage compartment located on the roof of the vehicle, so that the opening of the storage compartment and deployment or retraction of the device are controlled due to the dashboard of the vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic perspective view illustrating movements carried out by the panels of a wind power device during folding operation.    Savonius/Darrieus type wind power device (1)    Radial panels (3)    Pivot axles (5)    Rigid plate (7)    Body (9)