There are some quality suitcase solar kits that are simple to set-up and easily moved to track the sun more directly. They are available in a variety of wattages, about 100 watts a battery will get your battery bank charged back up quickly if cloudiness isn't an issue.
Now for the eternal question, is solar a better option than a generator? It really boils down to what your energy requirements are when camping off the power grid. As with anything else, both have their pros and cons. Try using the solar option first along with converting to LEDs and see if that will work.
Our preferred method of camping is off the power grid miles from anyone and require reliable charging of our battery bank as well as instant power for high current items that are run momentarily a few times throughout the day. Having both solar and a generator is what we found to be the perfect set-up.