I've noticed that my Norcold (Model 611 I beleve) in our 09 Cruiser does not cool as well on electricity as it does on propane.
I have to set it on coldest to register in the safe are on the refrig thermometer using electricity. Using propane I can set it on the next to lowest setting and keep the meter in the green.
BTW this test was with an empy frige. Camper was parked in my shed, i.e. in the shade.
Had a Norcold in our old Jayco that worked equally well on propane or electricity.
Anyone else experienced this?