NOVELTY - Electrohydraulic adjusting device (E) for solar panel carrier (T), comprises motor pump aggregate connected to hydrostatic rotation motor and tilt motors, and control system comprising pressure controlled blocking valves or load holding valves in working lines at least of hydrostatic tilt motor (M). A suction line is provided at the side of hydrostatic tilt motor for automatically adjusting a protected position of the carrier. The solar panel is selectively tiltable such that the carrier tends to automatically reach the protected position (S) without actuation by the hydrostatic tilt motor.    USE - Electrohydraulic adjusting device for a solar panel carrier.    ADVANTAGE - The electrohydraulic adjusting device can be operated with a small amount of electric power, which allows to adjust the protected position of the carrier even in the case of an electric power breakdown or in case that the electric power has been switched off intentionally, and which assures well-defined hydraulic conditions for a later re-start of the operation of the adjusting device. The monitoring solenoid has a power consumption of only 1.5-6, preferably 3 V, and is permanently energized during normal operation of the adjusting device.    DETAILED DESCRIPTION - Electrohydraulic adjusting device (E) for a solar panel carrier (T), comprises a motor pump aggregate connected to hydrostatic rotation motor and tilt motors, and a control system comprising valve components at least for a tilt control. The control system comprises pressure controlled blocking valves or load holding valves in working lines at least of hydrostatic tilt motor (M), where for automatically adjusting a protected position of the carrier a suction line is provided at the side of the hydrostatic tilt motor facing to the blocking valves or load holding valves. The suction line is controlled open only pressure dependently in case of a power switching off condition and/or an electrical power breakdown, by a monitoring solenoid between an open state and a closed state. The working lines are interconnected between the hydrostatic tilt motor and the blocking and load holding valves by a suction path. A discharge line branching off from the suction path is deviating the blocking valves or load holding valves. Pilot pressure operated multi-way seat valves are respectively arranged in the suction path and in the discharge line, where the multi-way seat valve is operated with pilot pressures from the suction path and the discharge line. A pilot circuit of multi-way seat valves is connected by an unloading branch to the discharge line. A solenoid seat valve is arranged in the unloading branch and has monitoring solenoid as a valve actuator for bringing the solenoid seat valve into a blocking position. The solar panel which, at least for tracking the position of the sun, is rotatable and tiltable at a sub-structure (1, U) by double-actuated hydrostatic rotation and tilt motors and selectively is tiltable such that the carrier tends to automatically reach the protected position (S) without actuation by the hydrostatic tilt motor.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic side view of a solar panel unit.    Sub-structure (1, U)    Electrohydraulic adjusting device (E)    Hydrostatic tilt motor (M)    Protected position (S)    Solar panel carrier (T)