Thank you for the replies!

Yes, I have a solar cover.

Yes, the panels are cool to the touch when the water is running through them.

Yes, the panels got warm to the touch when I turned the water off to them.

Yes, I have a diverter installed so I can turn the panels "on" and "off" at will.

The current water temp is about 68. When the panels are "on", the water coming into the pool is about 2 degrees warmer. Last year with the smaller pump, hence less water moving through the panels, the water coming into the pool was about 10 degrees warmer.

Am I correct in understanding that since more water is moving through the panels, even though the water coming into the pool is a lot cooler (than last year) that the water will heat faster?

Any guesstimates on how long it will take to heat the pool to about 80 degrees, assuming the panels are in the sun about 7 hours per day?

Also, with the diverter, I can adjust the flow of water to the panels. Someone suggested I reduce the flow of water into the panels. Is that a good idea? If so, how will I know if I'm causing too much back pressue to the pump?