Patent ID: 7577005

Claim:
A method for recognizing the operational state of a load ( 10 ) connected to the output ( 6 , 7 ) of a stand-alone inverter ( 1 ) , wherein a load recognition signal (S L ) is applied to the output ( 6 , 7 ) of the stand-alone inverter ( 1 ) at predetermined times during which specific electric parameters are measured on the stand-alone inverter ( 1 ) to thereby determine the operational state of the load ( 10 ), whereupon, with the load ( 10 ) activated, the stand-alone inverter is switched from a possible standby mode to permanent operation and, with the load ( 10 ) deactivated, the stand-alone inverter is switched from a possible permanent operation to standby mode, wherein a load-recognition signal (S L ) with at least one parameter (T, d, A, H, f) changed as a function of the type of load ( 10 ) is applied to the output ( 6 , 7 ) of the stand-alone inverter ( 1 ).