Refrigerator on 12v inverter

[TexasUltra]

When preparing for a trip I'd like to load the groceries including the refrigerator the day before.
If the batteries are fully charged (kept on battery tender) how long should the residential refrigerator run on the batteries/inverter?
Could I leave the battery tender on as additional power source?
I understand there are a lot of variables here so any input is welcome.

 

[david-steph2018]

Depends on how many batteries. In our Road Warrior we used to have 2 12v batteries. We could run the fridge for about 2 days, but I did not operate anything other equipment.

 

[TexasUltra]

Depends on how many batteries. In our Road Warrior we used to have 2 12v batteries. We could run the fridge for about 2 days, but I did not operate anything other equipment.

Yes, I have two...so overnight with just the fridge running should be OK. I think I'll try it without loading the fridge just to prove it.
Thanks for the input.