Abstract: The invention relates to a system comprising at least one battery tray and a tray holder, in particular for mounting the at least one battery tray in a battery box of a wind power installation, wherein the tray holder has a bearing side by means of which the battery tray can be placed on the tray holder, characterized in that the tray holder has an interlocking receptacle, wherein the battery tray is placed on the bearing side in a mounting position when it is held in an interlocking manner in the interlocking holder by means of a first side, wherein the tray holder has, at a distance from the interlocking holder, a fastening means for a force-fitting connection of a second side of the battery tray, and wherein the second side of the battery tray is pre-aligned in relation to the fastening means when the battery tray is in the mounting position.