Inverter for feeding electric energy from a DC source into an AC grid, - wherein the inverter has a housing and electric and electronic parts (21-29; 30; 31; 35) arranged within the housing, - wherein a cooling air channel with cooling fins aligned along the longitudinal direction of the cooling channel arranged therein runs centrally across the backside of the housing, - wherein adjacent to the cooling air channel receptacles for individual large electric parts are formed in the housing, the receptacles, in at least three directions, being delimited by outer walls of the housing made of metal, - wherein the outer walls are form-adapted to at least some of the large electric parts, - wherein power electronic parts in the housing rest against the inside of an outer wall of the housing made of metal, which, with its outside, forms the base of the cooling air channel, - wherein a main printed circuit board contacting the large electric parts and the power electronic parts is oriented with its upside pointing backwards within the housing, and - wherein the power electronic parts are soldered to the main printed circuit board, characterised in - that the receptacles for the individual large electric parts are formed on both sides of the cooling air channel running across the backside of the housing, - that some of the large electric parts are coil forms and that the outer wall in the receptacles for the coil forms at least partially abut against the coil forms, - wherein the coil forms are individually screwed to the housing, and wherein plug-in contacts are formed between the main printed circuit board and the coil forms screwed to the housing, and - that the power electronic parts soldered to the main printed circuit board are screwed to the housing to press them against the outer wall of the housing. - wherein the inverter has a housing and electric and electronic parts (21-29; 30; 31; 35) arranged within the housing, - wherein a cooling air channel with cooling fins aligned along the longitudinal direction of the cooling channel arranged therein runs centrally across the backside of the housing, - wherein adjacent to the cooling air channel receptacles for individual large electric parts are formed in the housing, the receptacles, in at least three directions, being delimited by outer walls of the housing made of metal, - wherein the outer walls are form-adapted to at least some of the large electric parts, - wherein power electronic parts in the housing rest against the inside of an outer wall of the housing made of metal, which, with its outside, forms the base of the cooling air channel, - wherein a main printed circuit board contacting the large electric parts and the power electronic parts is oriented with its upside pointing backwards within the housing, and - wherein the power electronic parts are soldered to the main printed circuit board, characterised in - that the receptacles for the individual large electric parts are formed on both sides of the cooling air channel running across the backside of the housing, - that some of the large electric parts are coil forms and that the outer wall in the receptacles for the coil forms at least partially abut against the coil forms, - wherein the coil forms are individually screwed to the housing, and wherein plug-in contacts are formed between the main printed circuit board and the coil forms screwed to the housing, and - that the power electronic parts soldered to the main printed circuit board are screwed to the housing to press them against the outer wall of the housing.