The other poster is incorrect when saying the reason for setting the post at less the 8'.
You do not cut each panel as there installed! You start the first one flush with the end and just hang all the rest without cutting anything, the panels are hung on the battens so there's no need for the panels to be sitting exactly where the post are.
Once you get to the end that one can be cut or the last post can be placed the distance needed to have it come out even.
I have not hung the panels with batter boards. I looked for pictures of this method and could not find any. How long are the batter boards? Do the go the entire length between the posts and then you hang the top rail of the panel on them? The rails of the pre assembled fence panels are not 1.5 inches thick they are typically somewhere between 3/4 to 1 inch thick so wouldn't you also have to shim the bottom two rails if you used 2x4 batter boards?
Well that's just a shame. A guy comes on and tells me what I'm wrong about but then doesn't explain what he's right about. How does one use baatte boards in this situation and how long are they? Full length?