The increasing demand of electric power is going to exceed the possibilities of the existing 12 V power net of today's vehicles and may finally lead to the 42 V PowerNet. A 42 V crankshaft starter generator system, however, is expensive due to the necessity of a drivetrain redesign. In premium and middle class vehicles a belt driven starter generator could be used especially for a transition period. One of the main advantages is that no redesign is neces sary as a belt driven starter generator offers considerably greater freedom for the placement somewhere in the neighbourhood of the drivetrain. In our testbed we want to investigate a belt driven starter generator system where a standard industry type 400 V induction machine is used as the electric motor. While for the 42 V PowerNet special induction machines are necessary such a standard induction ma chine will need an additional DC/DC converter to adapt the two voltage levels. On the one hand there is a cost advantage of the standard induction machine over the dedicated 42 V machine. On the other hand losses due to the comparably high power transmit ted between battery and machine at low voltage are expected to be reduced. So a standard induction machine may be a good solution for belt driven starter generators with spatial separation between battery and electric machine. For the full nominal machine voltage of 400 V the inverter needs an input voltage of 640 V DC. So a DC/DC converter has to be used on the battery side to supply the 640 V DC link. In this pa per a full bridge converter is proposed for the use with a standard induction machine as starter generator. The DC/DC converter must be placed near the battery to minimize the transmission losses between battery and induction machine whereas the three phase converter for the machine has to be placed closed to the starter generator. Due to the high DC link voltage currents at given power are low and so cheap IGET modules can be used. Peak currents necessary during engine cranking will be supported by the small DC link capacitor on the high voltage side. The decoupling of the battery from the machine voltage allows for simple battery monitoring systems and also for the use of supercaps at the high voltage side due to the higher voltage stroke.