Well, you're in good shape already. I've been in your shoes, and in fact we are heading out shortly for 8 weeks in AZ, which will include at least two off-grid stretches of two weeks each. If you can find a place to carry something 2'x2'x4", I'd suggest a 100w portable kit from eco-worthy. No need to deploy on the overnights, but once you get there, it will help a bunch! Depending on your energy usage, it might do everything you need. Our 100w portable kept up with our usage last year in the same situation.
As ninerbikes says, you need to be able to top off the batteries, and solar or plugging to shore power are the only practical ways. The generator is only good for getting to 80-90%, unless you want to run it for 12 hours.
http://www.eco-worthy.com/catalog/100w250w-foldable-poly-solar-panel-with-solar-charge-controller-free-shipping-p-347.htmlLED lights are a huge help if you haven't already changed to them. You can just change a few key ones for a start.
