On our '09 Elkmont, the fridge uses 12 VDC when traveling. The Norcold owner's manual is not very clear about this. If you have your owner's manual look at the falult codes (probably on page 11). The first fault code is no "on" light. The meaning is DC voltage is unavailable or fridge is OFF. I am not sure about using 12 VDC while not hooked up to shore power and gas turned off. That happened to me last week in a campground and I got a confusing fault code. I checked fuses, etc. and found that the shore power cable had pulled out of the power post. In any event, if only DC is available, the batteries would not last long.
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