We have a 2013 Palomino S238 that we bought new. When dry camping, we have to use the generator to charge the battery every AM, as it drops to about 30% power overnight. This is while using the frid...
Some of the Dometic fridges have a 12 volt electric defrosting heat element that can and will drain a battery in short order. Sometimes there's a switch to disable it, sometimes you need to open it up and clip the wire.
I am not sure if I should link to it, since its on a competing RV forum and I think that's against the rules here, but there is a lengthy thread on the other popular RV forum on it search "Dometic - How To Turn Off Heating Element For Seals"