the invention relates to a system for protecting a solar module against theft or unauthorized use by an authorized consumer . said system comprises an interruption device on the solar module side and a release device on the consumer side . the interruption device transmits a first signal to the release device via a power line and interrupts the transfer , via a power line , of energy generated by the solar module to the consumer if the interruption device does not receive , via said power line , a second signal from the release device within a specified first period . this permits the secure and economical protection of the solar module , since a solar module protected in the manner described above is of no value without the second signal .