The invention discloses a sensor connection element for a sensor, comprising: an energy store; a first data processing unit, with which is associated a first memory, for processing data and controlling a first wireless module; the first wireless module for transmitting/receiving data to/from a connection device; and a first inductive interface for transmitting energy from the energy store to the sensor, and for transmitting/receiving data to/from the sensor. The invention further discloses an energy-self-sufficient sensor system comprising the sensor connection element and a sensor.