Using 3 way fridge

I am new to caravaning. When I had my tow ball put on, I asked for an isolation switch to be added. (Who knows where that is, under bonnet I presume). I have since had two more solar panels put on the roof and thought I could run my fridge on 12V from the house battery when stationary. After paying thousands of dollars I am now told by the installers that my type of fridge which is not a compression fridge is only designed for battery use when driving along. Is this true? The only other things atm that I am using 12V for is water pump and lighting which is overkill for the amount of panels and extra battery I now have if I can’t run fridge on battery when stationary. I did try running on house battery overnight & even though the volt gauge showed 13, the freezer was defrosting in the morning. This is as clear as I can get, sorry. I would really like to understand how it all works & get some clarity before I take off on a long trip. Thanks Gail
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