Norcold 9.7 (10) cu ft 12 volt compressor fridge?

30 AH is a 20 hr draw from a room temp fridge to a #4 set program. Un-scientific but it was not impacted by any other heavy usage items other than parasitic draws. Last night, I uncovered the camper, turned on the battery switch and pleasantly surprised to find a full charge. Turned on the fridge. No sun today, In fact drizzling so no solar help to speak of.