Here's some info from Oasis Montana about solar/DC fridges/freezers. They seem kinda pricey to
me, but might be able to be resold, when your requirement is done, to recoup some of the cost.
http://www.eco-fridge.com/dcfridge.html
or an lpg powered option, also not cheap, but looks useful and is compact
http://www.lpappliances.com/RC3000.html
Or, if you did have room for a small propane tank, you might get a portable camping fridge from
C/W or some place like Bass Pro or Cabelas or Gander Mountain. The propane powered camp fridges
generally seem pretty reliable and don't use all that much propane, as far as I know. You can
usually find a refill place unless you're really "out there" some where.
http://www.campingworld.com/category/rv-appliances/130
http://www.insideyourrv.com/buying%20an ... ator.shtml
Just some other thoughts/options if the small meds-fridge doesn't work for you.
Good luck with it.