Power source assembly

A power source assembly for powering high current low impedance devices from an Autonomous Underwater Vehicle (AUV), battery pack and/or auxiliary battery packs, comprising:

• at least one high current low impedance device, a high current power source, wherein the high current low impedance device is powered by the high current power source;
• and
• at least one AUV comprising an AUV battery pack and/or auxiliary battery pack wherein the high current power source is recharged exclusively from the AUV battery pack and/or auxiliary battery pack onboard, and is without power supply from a surface vessel or umbilical,
• the high current power source configured to provide a high current supply at a set discharge current rate for a specified switching discharge period to the high current low impedance devices at one or more predefined current ranges, including a discharge current of 25-200 A to a low-impedance load of 0.1-10.0Ω,
• the high current low impedance device further comprising:
• a high current supply module comprising an electronic circuit configured to:
• supply a current from the AUV battery pack and/or auxiliary battery pack defined by a charge current available at a set voltage;
• store a supplied power in the high current power source;
• and
• supply a high current at the set discharge current rate to a connected high current output device,
• wherein charge/discharge switching periods of the high current power source is set to provide a charge period allowing the set discharge current rate to be maintained during the specified switching discharge period,
• wherein a switching cycle comprises discharging and recharging at current rates and time periods matching a recharge capability of the AUV battery pack and/or auxiliary battery pack, and
• wherein the high current supply module and the high current power source are enclosed in subsea pressure housings integrated with a hull of the AUV.