I've looked through the post here and on web sites and I'm not sure on how many solar panels we will need. We have a 30' rnd pool-not 27' like I thought earlier, it was a long winter. I want to run 2-4x20 panels side-by-side down the length of the deck. Do you think 2 would keep the water in the upper 80s ? Can you run the panels side-by-side(length to length) with ease or am I going to have alot of plumbing on the ground? Does this make sense to you-I'm not sure if I'm explaining it right.