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They work very well in boats,as the off engine drive refrig compresser only needs running for short periods to freeze the plate,which then keeps the box cold for days.Also some are 240v,these are only run while at the jetty,so the plate will be frozen,ready for a weekend or so away.
They run a simpl refrig. system,no electronics etc to cause grief.
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I've had my Auto Fridge for at least 15yrs, it spent three years rattling between Meekatharra and Wiluna and has also been on some other remote area trips in some hot and dusty conditions, it has also been unused for long periods. It has proven to be efficient and reliable.
However,
1- does not have in built 240volt power reducer. (came as seperate unit, merely an inconvenience)
2- if left to its own devices even on the lowest setting when left switched on it will eventually freeze everything. (Use of an indoor/outdoor thermometer helps prevent frozen and burst frothies, always switch it off overnight)
Would I recommend them as a set and forget fridge option? No
Our caravan came with a Waeco which we now use as our tavelling fridge and we use the Auto Fridge as a freezer in our caravan or for extended camping.
We are reasonably well set up with solar, dual batteries and gen set power so any small differences in power consumption and efficiencies are not a major factor.
My thoughts and experience for what they're worth.