How many watts of solar do you have? I have 200 watts and 2 six volt batteries. It has been plenty for my wife and I on a 13 day camping trip. We run the water pump, fridge (on propane), lights, fan, leak detectors, CD player, and daily charging of phones and laptop.
Your solar panel will be more productive if you can keep it aimed at the sun.
2015 Solaire 201SS
2015 GMC 2500HD Duramax