Your install is exceeding my expectations. You may remember that we have a timer on the water heater. At present, the timer connects the tank elements to the grid for a couple of hours in the evening. We took a chance the other day and turned the timer off. The next day was fairly sunny. Ambient temp never got above about 40 deg. The loop ran for about 3 hours, taking the tank from 60 degrees at the lower probe up to about 110 degrees, which is the same temp that the AC elements achieve. I’m a little bit nervous about what’s gonna happen in August. We might have to put some shadecloth over the panel!