We use our battery exclusively while dry camping and first thing I did was to run all my 12-volt things while my battery was connected through my amp meter and determined how much everything used. Those numbers, along with knowing the state of charge of my battery, allows me to generally have a handle on how long the batteries will last and also if something is wrong.
You may want to get a volt meter and find out if your battery is fully charged. One big battery draw that could go undetected is the switch at the frig that I believe de-humidifies the frig/freezer.