Editing Oberon-class submarine (section)

===Auxiliary power===
{{Unsourced section|date=June 2015}}
The batteries provide variable DC power (VP), which ranges in normal usage from 390 to 650 V. Pumps for ballast, water, air compressors, ventilation, cooling, and hydraulics are all designed to cope with this supply range, but some equipment cannot. The boat, therefore, is supplied with two sets of auxiliary motor generators designed to be powered by the batteries and produce stable output, one set powered by each main battery. A 220 V DC supply (CP) is provided by two {{convert|100|kW|abbr=on}} generators, one supplied from each battery with either being sufficient by itself. Two {{convert|15|kW|abbr=on}} 60&nbsp;Hz three-phase alternators provide power for equipment designed to work off 115 or 230 V AC and two more 15&nbsp;kW 400&nbsp;Hz generators provide power at 205 V AC used by radar, sonar, fire control, and communications electronics. Two {{convert|4|kW|abbr=on}} generators plus an additional backup battery provide 24 V DC.

In the event of damage to the main electrical distribution system, provision is made for one of the CP generators to be connected directly to one armature of the port motor, to provide some propulsion by alternative circuitry.<ref name=SFMNPA />