Gotta agree with Mike. We're really satisfied with our simple and inexpensive set up. I've been watching a couple of threads on this subject recently and I'm just not understanding the overkill, (IMHO) where folks are wanting to run "everything" on their batteries. A pair of good 6v or even 12v batteries will work just fine for a weekend of camping and much much longer if you have some method of topping them off (recharging) during the day. Yes, there are those who need to run a CPAP and to those folks I say "Good on Ya" for continuing to get out there to camp and enjoy life! You likely need a more sophisticated system.
For us, we watch movies when we feel like it. Use the CD and lights as much as we want. Keep the Cougar warm when we're camping late in the season and generally enjoy our time camping. Of course, to each his own, but the KISS method works for us