NOVELTY - The device (1) has a solar module i.e. solar roof (3), for generating a solar voltage (Us), and a charging installation (4) for transferring electricity from an external electrical network to a battery (2). The charging installation has an intermediate circuit capacitor (6) rechargeable by the generated solar voltage or transformed solar voltage. The generated solar voltage is transformable into a pre-determined intermediate circuit voltage (Uz) by a direct-current (DC) static converter (14). Amount of the intermediate circuit voltage is evaluated by a control- and evaluation device (15).    USE - Device for solar-assisted charging of a battery i.e. high volt battery, of an electrical vehicle or a hybrid vehicle (all claimed). Can also be used for a low-voltage battery or an electrical system battery.    ADVANTAGE - The charging installation comprises the intermediate circuit capacitor that is rechargeable by the generated solar voltage or the solar voltage transformed from the external electrical network, such that the solar-assisted charging of the battery can be enabled while allowing auxiliary charging of the battery from the external electrical network. The utilization of solar module avoids a need of additional electrical components to be arranged in the vehicle, so that installation space in the vehicle can be reduced while minimizing a weight and production costs of the vehicle.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a charging installation    (2) a method for solar-assisted charging of a battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic circuit diagram of a device for solar-assisted charging of a battery.    Solar voltage (Us)    Pre-determined intermediate circuit voltage (Uz)    Solar-assisted battery charging device (1)    Battery (2)    Solar roof (3)    Charging installation (4)    Intermediate circuit capacitor (6)    DC static converter (14)    Control- and evaluation device (15)