Bruce
Herd Master
I would think you would want cross fencing with 30 acres, otherwise you'll never find your animals Unless you have some well trained herding dogs to bring them in for you. Besides that I would guess you would want to have some control over where the animals are eating, especially if you are hoping they will clear out some of the vegetation. I suspect that like people, they will eat their favorites first and work their way down to the less "dessert" plants.
I know that on the Cyclops electric fence charger site that have a tool to help figure out what size charger you need. Along with length of wire run they ask about foliage. That said, I think you really want to make a nice wide clean path for the fence, and enough space to run your Gator (or whatever you have) to do fence checks. You don't want to be walking through weeds and trees to make sure all is well.
I know that on the Cyclops electric fence charger site that have a tool to help figure out what size charger you need. Along with length of wire run they ask about foliage. That said, I think you really want to make a nice wide clean path for the fence, and enough space to run your Gator (or whatever you have) to do fence checks. You don't want to be walking through weeds and trees to make sure all is well.