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Old 07-27-2016, 12:30 PM   #1
Adventure Gypsy
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2015 Interstate Grand Tour
Phoenix , Arizona
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Clarify Nova Kool

I would like to get a clarification regarding the Nova Kool Fridge and Freezer units supplied with the newer Grand Tour models. Do they run either exclusively on 12v or 120v, or a combination of both? Will they still run with inverter off? How about 12v disconnect? What if both are off?
Any help as to how these units operate will be greatly appreciated.

2015 AI Grand Tour on 2014 MB Sprinter
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Old 07-27-2016, 12:51 PM   #2
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2012 Interstate Coach
Metairie , Louisiana
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Nova Kool refrigerators and freezers as installed in an Airstream Interstate run on either 120vAC or 12vDC, if the installer didn't make a mistake.

When any 120vAC source is available, the units default to that. The only way to make them run on 12vDC is to remove all 120vAC sources, including the inverter.

Running the units on the inverter is a waste. The fridges are designed to run on 12vDC, and include their own converter to convert incoming 120vAC to 12vDC; that's how they're able to operate AC/DC in the first place. So when you're using inverter power, you're turning 12vDC at the batteries to 120vAC to power the fridge/freezer, only to have the fridge/freezer convert it back to 12vDC. Since there are power losses at each device, the units operate less efficiently off the inverter than they do off straight DC power.

Seems to me that Airstream should have plugged them into a 120vAC outlet that is not powered by the inverter. That way it would run off 120vAC if you're on generator or shore power, but not off the inverter. On the non-Grand Tour models, some owners have unplugged the 120vAC cord to use their fridges in 12vDC mode only. This is a worthwhile modification for anyone who intends to boondock in their Interstate.

On the Grand Tours, that have separate fridges and freezers, there have been some reports of the 12vDC connections accidentally being left undone at Jackson Center so the unit is installed as 120vAC only. If yours doesn't work on 12vDC, that is something that needs to be corrected.

One final note, if you shut off both the 12v power and the inverter, the fridge and freezer will not run.

Does that clarify things, or just make them more confusing?

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Engineering: Finding complex solutions to simple problems you didn't even know you had.
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Old 07-27-2016, 03:31 PM   #3
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Yes. That helps a lot.
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