Chris has it right. For camping purposes, a smaller Morningstar 4.5a Sunguard controller would do fine with your 30 watt panel, especially because it is all sealed and potted. No adjustments.
Grab a small agm, like 5 to 7ah size as your intermediary load to charge, and at the same time use a 12v li-ion charger attached to that.
Like most controllers, attach the battery to the controller first, and the panel last. This allows the controller to get it's brain together first. If you attach the panel first, and the battery last, many controllers not knowing the difference between a dead 0 volt battery, and one that is missing entirely as you put the system together may either refuse to charge, or go into a float-only safe mode. So batt first, panel last. And of course attach your li-ion charger to the agm battery once that's all together.
Now you have a stable source of power for the charger. When clouds or other obstructions pass over the panel, the li-ion charger doesn't know any difference.
If the 14500's are LiFeP04 chemistry (3.2v nominal, not the 3.6v nominal of other types), a smaller setup like a folding panel with a 5v usb output to a SunJack AA/lifepo4 charger works too. BUT, you have to babysit the charger, since any obstruction to direct sunlight may make the charger reset, and in some cases stop charging altogether and error-out, requiring a reinsertion of the batteries. Make note of the beveled side of the micro-usb jack - it's not too apparent and if you push it in the wrong way, you can damage the jack. On mine, the smaller beveled side of the jack is facing down.
I charge 14500 lifepo4's as a goof this way. Not a serious setup, but it works. And, the low 300ma output per cell (if you're lucky) is just too slow for most AA nimh, but I guess if you have no other option ....