Will put a laser thermo on the bottom of my panels Monday to see a temp reading . I would like to know my self i felt the bottom side of mine in January was pretty warm so Im sure it will be much hotter than the 65 constant degrees that my water well produces . Figure it would be a decent experiment for preheating it before the water heater. And i would like to see if it would have any effect on power production have thought about the same thing with the 12 thermocoolers i have laying around.