Good battery bank and a generator. I can't imagine more than 24 hours without 120v to the fridge. I'm guessing you have 5-6 k genset onboard, right. So it runs 2-3 hours in the am and 2-3 hours in the pm and you should be good. It's all depending on the restrictions of running the genset where you are and how much fuel your using for the genset.
2012 Cedar Creek 36 CKTS (loaded). Mrs Greentow & Missy & Maggie, Shih Tzu's with an attitude. USA(R). 30+ years in the Fire/EMS service, GS Life member.
TV is a 2012 RAM 5500 Quadcab with body by Eby (flatbed). Cummins 6.7 with 6 speed auto.