This page: high power 24 volt to 12 volt DC/DC
converters at low cost. 540 watts continuous.
These are fully regulated switching power
converters (switchmode), designed to allow the use of 12 volt equipment in
24 volt vehicles. These are attractive, reliable, robust DC/DC converters
good for fork lifts, off-road, construction and recreational equipment. This
has "forced air cooling" and should be protected from water, spray, and dust
that could be sucked into the power supply.