Sure you can run your RV fridge on AC mode using an inverter whether going down the road or parked, although the majority of RVers believe it unnecessary preferring to just use propane mode. We did it a couple of times primarily to test inverter functionality while underway, without a doubt our battery bank was a bit down upon arrival. Since our preferred method of RVing is boondocking or dry camping out in the open without hookups, we find it an unwarranted waste of our 12 volt DC reserves.