Patent ID: 7609010

Claim:
An inverter for converting direct current voltage to alternating current voltage comprising: a first input arranged to be connected to a vessel's ordinary current supply system, where said current supply system comprises a generator connected to a battery, and an output arranged to be connected to an alternating current motor, where, for at least a period of time, said alternating current motor requires a first torque M 1 in order to rotate, wherein a regulating circuit is arranged to measure a charging current from said generator to said battery and to measure the voltage level in said battery, said regulating circuit is, in addition, arranged to permit an output current from said vessel's ordinary current supply system to said inverter which is higher than said charging current, in a first operating mode and said regulating circuit is arranged to limit said output current while maintaining the torque for said motor, in a second operating mode, said regulating circuit is arranged to assume said first operating mode if said battery voltage is over a limit value for the battery voltage, and said regulating circuit is arranged to assume said second operating mode when said battery voltage is below said limit value for the battery voltage, in order thereby to prevent said battery voltage from dropping further.