Aspects of the present invention relate to a
control system (200) for controlling a power
system (400) of a vehicle (600), the power
system (400) comprising at least one
high voltage battery pack (410), at least one primary DC-
DC converter (420,422), and at least one secondary DC-
DC converter (424), the at least one
high voltage battery pack (410) being electrically connected to a
low voltage bus (460) via the at least one primary DC-
DC converter (420,422), and selectively electrically connected via the at least one secondary DC-DC converter (424), the
control system (200) comprising one or more processors (220) collectively configured to: receive load information indicative of a power supply requirement of the
low voltage bus (460); determine, in dependence on the received load information, a
control signal (260) for each of the DC-DC convertors (420,422,424), to control the at least one primary DC-DC converter (420,422) to supply power from the at least one
high voltage battery pack (410) to the
low voltage bus (460), and further control the at least one secondary DC-DC converter (424) to supply power from the at least one
high voltage battery pack (410) to the low
voltage bus (460) when the received load information is above a first load threshold; and output the
control signal (260). Aspects of the invention also relate to a power
system (400) comprising a
control system (200), a vehicle comprising a power system (400) or a control system (200), and a method (500) for operating a control system (200) for controlling a power system (400) of a vehicle (600).