An arrangement of a genset and a container, in which the genset is arranged, whereby the arrangement also comprises a cooling device and the genset can be cooled in the operating state of the genset by the cooling device, whereby the cooling device is arranged between a first position in which the cooling device is arranged entirely within the container, and a second position in which at least part of the cooling device can be moved at least partially outside the container, whereby the genset can be moved into its operating state when the cooling device is in the second position.