Welcome to Permies May!
We're oddballs here, and answer questions with different alternatives to the original question. I do make perpetual stew. But not in a crock pot. Mine is in a heavy bottomed stainless steel pot. I add ingredients, bring it to boil for 15 minutes, then put it in a "hay box". 8 to 24 hours later every thing is cooked, and still piping HOT. Note: I do now cook my meats before adding them, but only because sometimes it is needed to bulk up the current meal. We serve that up before placing the soup in the hay box.
Some relevant threads:
How to make a hay box.
Hay box cooker, thermal cooking...
Perpetual stew and friends.
My hay box is a styrofoam cooler. I wrap my pot in a wool blanket and put it inside.