The Power Feeding Equipment (PFE) and Submarine Line Terminating Equipment (SLTE) are powered from a -48V DC system that has 1+1 redundancy. Each rectifier is made up of 17 x RT8 48V 60A rectifier modules so the total device capacity is 1020A. Having such a modular device allows for easy maintenance and expansion if we require more DC.
As we have explained in earlier entries, the PFE is set up such that the system is double end fed (DEF) between the PFEs in Sydney and Guam. To provide even further redundancy, the PFE at each site is able to single end feed (SEF) the entire system, which equates to approximately 8,500V at 0.95A. In order to allow for continuous service we have diesel generators which back up the commercial mains and two banks of batteries that can provide a total of 800A DC @ -48V for up to 4 hours in the event of a major catastrophe on the power system in Sydney. The batteries (pictured ) are HZ-B2 2000 from Haze. They are sealed lead acid AGM type.