Roy is correct.
The VERY FIRST thing you need to know is what you plan on using, while dry-camping. You can then decide as to what your inverter size and battery needs will be. Then you have to decide as to how you want to recharge the batteries to meet your daily dry-camping life style.
If you want to continue living your regular life style (AC, Toaster, Elec coffee Pot...) no two ways about it, you will need a generator. If you can live without the AC, and high powered gizmos, SOLAR could be an option. Either way, you need to do a lot of research on each method.
Just my thoughts
I LOVE SOLAR and SOLAR is not that expensive any more
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329