Thanks for the information. I can't fathom any refer shutting down for 2 hours every 24 hours, that doesn't make sense to me. Seems to be a pretty useless feature, defrosting, for those of us that aren't using our rigs longer than a week at a time, or shorter trips.
I do believe the fan system I have seems to run 24-7, but I guess it could shut off if the defrost cycle shuts everything off.
My Refer is a Model 2811X ( 2021-3120RL that I believe has the 2022 upgrades-IE it might be a '22 model), and I just read the english portion of the owners manual. In 2 places it mentions " At regular intervals the temperature control system automatically melts most of the frost from the cooling fins.
I don't see anything else about any defrost cycle, but I have been known to miss reading instructions.....
Old rig: 2005 Ram QC 1500 5.7- Rockwood 8288 4- 6v batteries
New rig: 2016 Ram 25004x4 QC LB & ordered 3120rl legacy-solarflex Li batteries soon