I am using a Dometic RM 2451...I use it in the electric mode when traveling via an Inverter if I am on the move more than 5 hours, its silent and frugal on
propane when camping, the
propane which I have on board for the stoves and
furnace seemed the logical choice for me.
When you install any of these boxes or the ice only ice boxes I suggest to line the cabinet it will slip into with a foil backed reflective insulation...it can make a huge difference in refrigerator cycle times (solar) or ice survival and the temp of the contents in the box will benefit...there is two kinds of heat basically in this type of mechanical refrigeration...sensible and insensible heats...the first is managed by a mechanical/chemical process the second must be best handled by reflecting it mostly.
Here is a way of understanding it...your driving on a hot day, the
windows are up and the A/C is blasting...the car is actually cold but as your car changes orientation to the sun your arm has sunlight hit it and it becomes hot...now the air in the cabin is still cold...but the arm is still hot?...the heat striking your arm is infrared...as this insensible heat enters the cabin it will not raise the temp of the air but when it strikes a solid target like your arm that target goes up in temp and then the target can raise the temp of the air contacting it so the cabin gets hot.
For this reason fancy tinted
windows really work, the tint reflects infrared (insensible heat) away from the cabin before it can enter.
Fiberglass trailers are plastic, the outer colored shell (gel coat) is 20 to 50 mils thick on average, about as thick as a garbage bags plastic...the rest of the skin is spun glass and semi clear resin, (plastic) infrared penetrates this type of structure really well...in the case of the ice box it will come through and penetrate an unreflective ice box and warm the food quickly most ice boxes are white styrofoam and plastic liners...no foils are used...refrigerated boxes generally come with the outer reflectex card (foil) board and is already installed at the factory...the ice boxes do not give such considerations...you must add it if wise...your ice will last days longer in some sunny climates. If you do go with the solar concept the heat load can be reduced along with cycle times per hour needed (ergo demand) on the
battery power required per solar day, at least it will be diminished R-Max board can super insulate a cold box and in a solar design I would make that a prime consideration.
Harry