just to throw a spanner in the works
NORCOLD is ENGEL
The long tubular compressor that another poster mentioned is the
engel/norcold compressor.
the reason i know is a friend of mine is the dealer/repairer for these in WA
http://www.engeland.com.au/
he has often done conversions from the norcold to the engel.
Norcold is often 110v and Engel is often 240v
on freeze they will draw 5 amp
on refridge i think is is 2 amp.
on the newer models the older models draw more power 7 and 3 i think
i helped another friend install one into my old boat(i sold the boat to
him and now he is a friend him)
he built the suround in foam and glass with a small division so that it
had 2 chambers one is fridge the other freezer
works fine and all he has is 2 300 cca car batterys with 2 solar panels.
he plugs it into mains to draw it down then as soon a he leaves it auto
switches to 12v.
so far it has worked very well for up to 2weeks constant with out out
side power.
Shaun