Bill is right about there being a typo, although he has surmised the wrong typo. My Norcold manual is a bit different from the one posted by Rickst, but in the Installation section, it says "DC Operation: 14 VDC (11.5 V min, 15.4 Volts max.)"
In the Operating section of my manual, Page 5 doesn't say anything about electric operation. On page 6, I find the statement "While the vehicle engine is running, have a qualified service technician make sure the voltage of the DC power supply leads at the refrigerator is more than 11.5 VDC."
Bill
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