I have used a Norcold freezer unit for 5 years. It is 12v or 110v. I took it to Alaska and all over the US, Works great and all we use it for is a freezer. When not traveling We keep it indoors at our place in Florida and use it for freezer storage as the house fridge has a small freezer. We also have a small Engle that we use as a fridge for drinks, it is also 12v or 110v ,and it also can be used as a freezer. Both have been trouble free and preform great.