Sevcon
Astrodyne
Quda
Astrodyne DC to DC converters
Features; adjustable output voltage, Isolated
Input: 19-36 or 36-72 or 72-144 VDC
Output: 12VDC 150-200W
Quda DC to DC converters
Features; Water resistant potting, compact size
Input: 36-48 VDC
Output: 12VDC 100watt