We just replaced our Dometic refrigerator with a new one. On our old refrigerator we had an aftermarket 3-way switch put in (AC, DC, Propane). That way we could run our fridge on DC while we drove. Now I am told I can only use propane or electric and the fridge is off during travel. I can't believe stuff stays cold enough. We often travel for several hours at a time. What is the problem with using DC while driving? The batteries charge while driving. Is it possible to put in an inverter? Edie T., (Kent, WA)
Yes, you could add a dedicated inverter to power the refrigerator on 120-volt AC while driving, but that too, would require proper sizing of the battery bank. In my experience, simply getting the refrigerator (and the properly stowed food), as cold as possible on propane or shoreline power before heading out, and then avoiding opening the doors during the day, will usually keep everything cold enough until you can fire up one of the other modes once you stop for the night. The frozen T-bones and lobster tails should not defrost during that time. Of course, even a 2-way refrigerator is designed to be operated on propane while driving down the road if you are in that camp, (check out this related question).
If you really must have the refrigerator on while driving, but aren’t confident using propane while going down the road, then the addition of an inverter and a healthier battery bank might be the most economical option; certainly less than swapping out the refrigerator again for a 3-way unit. I'm curious as to why the dealer simply didn't sell you a 3-way model to begin with...
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