OK, I've read over a lot of the threads regarding solar panels and how they work but I'm still struggling. Here's my situation:

We had a 16'x46" round pool with two 2x20 panels piped to the roof and with a 1/2 hp pump. If we had 3 consecutive days over 80, the water temp would reach about 80. We are in Oregon and all in all, we were happy (although more warm water days would be nice).

This year we've installed an 18'x52" round with a 1 hp pump and the same solar panels. Today we opened the plumbing to the panels and the new filter is pushing the water through them so fast that it's barely heating.

What is the best way to determine if our setup will work? Any other ideas? The 2 panels are parallel with water going from: pool, pump/filter, lower panel, upper panel, pool.

Also, I just want to say that the people on this site are the best. I rarely post but lurk a lot. I found you two years ago in the middle of a baq nightmare and you've made my pool life enjoyable and easy!!