Vicor MegaPAC DC/DC power supply.
this is a 115/230 auto-ranging input and has 8 modules.
6x M5.2v / 38.5A
2x M5v / 40Av2
These modules can be trimmed up as much as 10% or down as much as 50%.
To set up for 13.5v you just need to trim them down to 4.5v and then put three in...