"A dry-fit of the fridge and insulation (2"" foam).  This will determine the location of the dividing wall as well as the shelf above the fridge opening.  The <a href=""http://www.novakool.com/index.htm"">Nova Kool</a> R4500 has an internal volume of 4.3 cubic feet and draws 2.2 amps at 12 volts DC.  For comparison...a compact fridge from Sears uses 315 kilowatt-hours per year, or 863 watts per day...which at 120 volts is 7.191 amp-hours.  The Nova Kool uses 2.2 amps at 12 volts DC, which is .22 amps at 120 volts AC.  <strong>This means the Nova Kool would have to run continuously more than 32 hours per day to use the same electricity used by the Sears model.</strong>  On average, fridges run 25% - 35% (6 - 8.5 hours) of the day, depending on ambient external temperatures and other factors.  We opted against a propane model because of the requirement to have the vehicle within 3% of level.  We also didn't want to deal with adding an exhaust vent stack.  We also considered 12vdc refrigerator models by <a href=""http://www.waecousa.com/"">Waeco</a>, <a href=""http://www.norcold.com/norcold_home.cfm"">Norcold</a>, <a href=""http://www.sundanzer.com/"">SunDanzer</a>, and Zero."
{}