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An inverter (1) for supplying electric energy from a DC source to an AC grid includes a housing (2) in which electrical and electronic components (21, 22, 30) are accommodated. A cooling air channel (9) with cooling fins (37) arranged along its longitudinal axis runs across the back of the housing (

An inverter (1) for supplying electric energy from a DC source to an AC grid includes a housing (2) in which electrical and electronic components (21, 22, 30) are accommodated. A cooling air channel (9) with cooling fins (37) arranged along its longitudinal axis runs across the back of the housing (2) in the middle. Sockets (13) for large electrical components (21, 22) that are closed in on at least three sides by the metal outer walls (14-19) of the housing (2) are provide on both sides of the cooling air channel (9) in the housing (2).

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1. An inverter for supplying electric energy from a DC power source to an AC grid, the inverter comprising: electrical and electronic components, wherein the electrical and electronic components include large electrical components, power electronic components, and a main board; anda sealed housing w

1. An inverter for supplying electric energy from a DC power source to an AC grid, the inverter comprising: electrical and electronic components, wherein the electrical and electronic components include large electrical components, power electronic components, and a main board; anda sealed housing which accommodates the electrical and electronic components, the sealed housing including a housing back part made of a metal, wherein the sealed housing provides: an external cooling air channel extending across a rear side of the sealed housing,cooling fins within the cooling air channel, the cooling fins extending from a base of the external cooling air channel and along the external cooling air channel, andinternal sockets in the housing back part, the internal sockets on both sides of the external cooling air channel, wherein the internal sockets accommodate the large electrical components,wherein some of the large electrical components in the internal sockets are screwed to the housing back part and connected via plug contacts to the main board, the main board is positioned in the housing back part with a top side of the main board, the top side facing toward the housing back part, wherein others of the large electrical components in the internal sockets are soldered to the top side of the main board, andwherein the power electronic components are soldered to the top side of the main board and the power electronic components are screwed, through the main board, to the housing back part at an inner side of the base of the external cooling air channel. 2. The inverter of claim 1, wherein the main board is screwed to the housing back part. 3. The inverter of claim 1, wherein the main board is positioned within a free inner cross-sectional area of the housing back part by means of an internal positioning rib of the housing back part extending inwardly from a circumferential portion of the housing back part. 4. The inverter of claim 1, wherein the internal sockets accommodate the some of the large electrical components in such a way that the some of the large electrical components are closed in on at least three sides by the metal of the housing back part. 5. The inverter of claim 4, wherein the metal of the housing back part forming the internal sockets is formed around the large electrical components. 6. The inverter of claim 5, wherein heat-conductive paste is applied between the some of the large electrical components and the metal of the housing back part. 7. The inverter of claim 1, wherein the base of the external cooling air channel has greater thickness than adjacent portions of the housing back part. 8. The inverter of claim 1, wherein heat-conductive paste is applied between the power electronic components and the inner side of the base of the external cooling air channel. 9. The inverter of claim 1, wherein in a mounted position of the inverter, the main board spans a free vertical inner cross-section of the housing back part. 10. The inverter of claim 1, wherein the electrical and electronic components further include a control board that is mounted with a back side of the control board facing the back side of the main board. 11. The inverter of claim 10, wherein the main board is provided with a first portion of wired components of the electrical and electronic components exclusively on the top side of the main board and the control board is provided with a second portion of the wired components of the electrical and electronic components exclusively on a top side of the control board, the top side of the control board opposing the back side of the control board. 12. The inverter of claim 10, wherein at least one multipoint connection plug board is provided between the main board and the control board. 13. The inverter of claim 1, wherein the housing back part is a one-piece body casted of the metal. 14. The inverter of claim 13, wherein the one-piece body casted of the metal is die-casted of an aluminum alloy. 15. The inverter of claim 1, wherein in a mounted position of the inverter, the external cooling air channel is running vertically. 16. The inverter of claim 15, wherein a fan is designed and arranged for blowing ambient air into the external cooling air channel from below the external cooling air channel. 17. The inverter of claim 1, wherein the sealed housing further includes a housing front part sealingly closing a front opening of the housing back part. 18. The inverter of claim 17, wherein the housing front part consists of a one-piece body casted of the metal and a display window inserted in an opening of the one-piece body. 19. The inverter of claim 18, wherein the one-piece body casted of the metal is die-casted of an aluminum alloy. 20. The inverter of claim 1, wherein the sealed housing is suspended in a mounting tray that is configured for being mounted laterally between vertical beams, and the mounting tray has a rear wall forming air supply pockets above and below the sealed housing. 21. A method of assembling an inverter for supplying electric energy from a DC power source to an AC grid, the method comprising the steps of: providing electrical and electronic components, wherein the electrical and electronic components include large electrical components, power electronic components, a main board, and a housing for accommodating the electrical and electronic components, the housing including a housing back part made of a metal that provides an external cooling air channel extending across a rear side of the housing, cooling fins within the external cooling air channel, the cooling fins extending from a base of the external cooling air channel and along the external cooling air channel, and internal sockets in the housing back part, the internal sockets being arranged on both sides of the external cooling air channel for accommodating the large electrical components;arranging some of the large electrical components, each of the some of the large electrical components in one of the internal sockets, and screwing the some of the large electrical components to the housing back part;soldering the power electronic components and others of the large electrical components to a top side of the main board;upon positioning the main board within the housing back part with the top side of the main board facing backwards toward the housing back part, locating each of the others of the large electrical components soldered to the top side of the main board in one of the internal sockets, and electrically connecting the each of the some of the large electrical components already screwed to the housing back part to the main board via plug contacts;screwing the power electronic components soldered to the top side of the main board through the main board arranged in the housing back part to the housing back part at an inner side of the base of the external cooling air channel; andsealing the housing. 22. The method of claim 21, further comprising a step of screwing the positioned main board to the housing back part. 23. The method of claim 21, wherein in the step of positioning the main board within the housing back part, the main board is positioned within a free inner cross-section of the housing back part in contact with an internal positioning rib of the housing back part extending inwardly from a circumferential portion of the housing back part. 24. The method of claim 21, wherein in the step of arranging the some of the large electrical components, the some of the large electrical components are arranged in the internal sockets in such a way that the some of the large electrical components are closed in on at least three sides by the metal of the housing back part. 25. The method of claim 24, wherein in the step of arranging the some of the large electrical components, heat-conductive paste is applied between the some of the large electrical components and the metal of the housing back part formed around the some of the large electrical components. 26. The method of claim 21, wherein in the step of positioning the main board within the housing back part, heat-conductive paste is applied between the power electronic components soldered to the main board and the inner side of the base of the external cooling air channel. 27. The method of claim 21, wherein in the step of soldering the power electronic components and the others of the large electrical components, wired components of the electrical and electronic components are exclusively located on the top side of the main board. 28. The method of claim 21, further comprising a step of mounting a control board with a back side of the control board facing the back side of the main board. 29. The method of claim 28, further comprising a step of soldering wired components of the electrical and electronic components to the control board, wherein the wired components are exclusively located on the top side of the control board. 30. The method of claim 28, wherein in the step of mounting the control board the main board and the control board are electronically connected by at least one multipoint connection plug board. 31. The method of claim 21, further comprising a step of casting the housing back part as a one-piece body of the metal. 32. The method of claim 31, wherein the step of casting the one-piece body of the metal includes die-casting the housing back part of an aluminum alloy. 33. The method of claim 21, further comprising a step of orientating the housing back part such that the external cooling air channel is running vertically. 34. The method of claim 33, further comprising a step of mounting a fan to the housing back part at a lower end of the external cooling air channel for blowing ambient air into the external cooling air channel from below the external cooling air channel. 35. The method of claim 21, wherein the step of sealing the housing includes closing a front opening of the housing back part with a housing front part. 36. The method of claim 35, wherein the step of sealing the housing includes arranging an elastic sealing material between the housing back part and the housing front part. 37. The method of claim 35, further comprising steps of casting the housing front part as a one-piece body of the metal, and of inserting a display window in an opening of the one-piece body to provide the housing front part. 38. The method of claim 37, wherein the step of casting the one-piece body of the metal includes die-casting the one-piece body of the housing front part of an aluminum alloy. 39. The method of claim 33, wherein orientating the housing back part comprises the steps of providing a mounting tray having a rear wall forming air supply pockets above and below a mounting area, mounting the mounting tray laterally between vertical beams, mounting the housing to the mounting area of the mounting tray, and connecting the inverter to the DC source and the AC power grid via terminal lines provided at the mounting tray. 40. The method of claim 34, wherein orientating the housing back part comprises the steps of providing a mounting tray having a rear wall forming air supply pockets above and below a mounting area, mounting the mounting tray laterally between vertical beams, mounting the housing to the mounting area of the mounting tray, and connecting the inverter to the DC source and the AC power grid via terminal lines provided at the mounting tray.