Electrical system and method of operating an on-board network

The invention relates to a vehicle power supply, comprising: - a starter system with a high-power consumers, in particular a starter and a first energy store, in particular a double layer capacitor; - an intermediate network to a second energy store, in particular a lithium Polymerakkumulator; - a consumer network with at least one electrical load, - wherein the starter network is electrically coupled to the intermediate network via a first voltage converter, - wherein the intermediate network to the consumer network via a second voltage transformer is electrically coupled and the vehicle electrical system has a control device which controls the electric voltage in the network in dependence on a parameter of the second energy storage device or regulates.