Just installed an 80 sq ft solar panel for my 160 sq ft pool. I'm very happy with the results and performance. The rack I built for the panel was the largest expense in the project. The panel is on 4x4's, 2x4's and hardibacker board. It is elevated about 9 feet and at a 45 degree angle. I have room to place another panel at a 20 degree angle below the first. Expense would be minimal to add on to the structure of the rack. For less than $300 I can get the panel and build the rack to hold it.
Is 160 sq ft of solar panels way overkill for 160 sq ft of pool? Would 2 panels keep the water warmer longer or just make the water hotter for the same time frame? I'm thinking when it turns to 3 or 4 hours of direct sun for the panel two panles would double the heat output.
Am I right or would a second panel just be a waste of money. When the weather turns will it be futile to try to heat the pool with solar regardless of the amount of solar panels?