I have a 27ft AG and a 4' x 20' panel. I bumped up a thread that shows my set up. Until your registration is completed, you'll have to first log out to be able to see the rest of the forum. So, log out and go and look at the Above Ground pool section of the forum. You should find the thread I bumped up. The title of the thread is 'Solar Heater for Above Ground Pools.'

Hope this helps!