I have the 86 qt unit and it has been holding -08f for well over three weeks in my cart. Works as advertised and is a best buy in my book. The damn thing just works.
I was gonna PM you but thought others might want your answer too (you too Dad’s Dogs).
Are you running your Edgestar straight off a battery or do you run a generator? If straight from12V battery, how long do you get out of your battery with this?