Welcome to the forum, Davianni

As not many people come to this part of the forum, it may pay to copy and paste your question, into the techi part of the forum

I am not a techi, so can only go by my own experience, I will assume you mean 2 X 100 AH batteries, the techies will probably want to know what type of batteries

I found that it was easier (for me) to actually work backwards

1. I figured out that I used about 7½ amps per hour, while I was using the TV + lights + fan 
   I then calculated that I would never use more than 120 AH (Amp Hours) each day
2. I then purchased 2 X 120 AH AGM Bosch batteries, knowing that (all things being equal), I would never drain them more than 50%
3. I then purchased 300 watts of solar panel, and placed on roof, with a 20 Amp DC/DC charger, near the batteries
   The CTEK DC/DC charger, uses the engine, and/or the solar to charge the batteries
4. I then (later on), changed my gas fridge, to a 12 volt only fridge
   This was OK as (for whatever reason), we do not bother with the TV anymore
5. I found that in certain situations, that my airconditioner was shading my roof solar panel
   I therefore purchased a lightweight 160 Watt portable solar panel

I have stayed (at Greens Lake) for up to three weeks at a time, with my current system

Hope that this info is useful to you, as it is very hard to predict, how long your system will last, without knowing what your power requirements are