A connection device for conductor ends, which are flat conductor ends, on a photovoltaic panel, out of which protrude a plurality of conductor ends, and which a) has a connection housing with an electronic circuit that is received in the connection housing, and b) a receiving unit which can be attached to the photovoltaic panel and especially glued on it for the purpose of receiving the conductor ends upon which the connection housing can be placed, c) wherein the connection housing is provided with connection contacts, and d) wherein the flat connector ends can be contacted by means of the current-conducting connection contacts, e) wherein the receiving unit is formed as a receiving carrier, which has at least one seat or a multitude of seats, in particular receiving bridges, via which one of the flat conductor ends can be bent, and wherein the connection housing can be inserted into the receiving carrier, e.g. it can be latched thereon, for which purpose it comprises at any rate a sectionally open bottom side so that it can be placed over the receiving carrier, and f) wherein the connection housing has a base part and a lid part, characterized by an electronic circuit, fixed to the lid part 9, which can be removed as a unit from the base part together with lid part, g) wherein the connection housing is provided with spring-finger contacts as connection contacts that are open in bell fashion toward the receiving bridges, said contacts being used for the purpose of contacting the flat conductor ends that are bent up upon the receiving bridges as the connection housing is placed upon the receiving carrier, characterized in that h) the connection contacts are further formed and arranged that during the removal of the lid part from the base part said connection contacts will remain in the state on the photovoltaic panel where they contact the conductor ends, and i) the connection contacts are formed as double contacts with opposite contacting direction. a) has a connection housing with an electronic circuit that is received in the connection housing, and b) a receiving unit which can be attached to the photovoltaic panel and especially glued on it for the purpose of receiving the conductor ends upon which the connection housing can be placed, c) wherein the connection housing is provided with connection contacts, and d) wherein the flat connector ends can be contacted by means of the current-conducting connection contacts, e) wherein the receiving unit is formed as a receiving carrier, which has at least one seat or a multitude of seats, in particular receiving bridges, via which one of the flat conductor ends can be bent, and wherein the connection housing can be inserted into the receiving carrier, e.g. it can be latched thereon, for which purpose it comprises at any rate a sectionally open bottom side so that it can be placed over the receiving carrier, and f) wherein the connection housing has a base part and a lid part, characterized by an electronic circuit, fixed to the lid part 9, which can be removed as a unit from the base part together with lid part, g) wherein the connection housing is provided with spring-finger contacts as connection contacts that are open in bell fashion toward the receiving bridges, said contacts being used for the purpose of contacting the flat conductor ends that are bent up upon the receiving bridges as the connection housing is placed upon the receiving carrier, h) the connection contacts are further formed and arranged that during the removal of the lid part from the base part said connection contacts will remain in the state on the photovoltaic panel where they contact the conductor ends, and i) the connection contacts are formed as double contacts with opposite contacting direction.