Method for positioning a motor vehicle, system with such a motor vehicle as well as a motor vehicle

The method involves moving an electric car (14) to a predetermined charging position such that a primary element (18) of a charging device (10) corresponds to a secondary element (20) of the charging device on a side of a road. The reaching of the charging position is determined by an optical sensor that detects alignment of mutually different markings of a positioning element, where the positioning element overlaps with the primary element of a battery (12) or with the secondary element of the charging device. Independent claims are also included for the following: (1) a charging system for a motor vehicle (2) a motor vehicle.