Nah...I just run 'em in the cooler night air. I've forgotten what the solar panel formula is... something like your panels should have half the surface area of your pool. 'Way more than you actually need. I have the equivalent of the 3 4'x20' panels, and the "Rule" says I'm short by one...no way! Since all you are doing is warming pool water, tight tolerances on things like panel size, flow rates, critical BTU/Calories gen'd aren't really important.

Carl