Dumb Questions about set up

Does the addtion of solar panels create the need for larger pump - because of the addtional head?

Can I bypass (with a valve) the water's path through the panels if my pool temp is where I want it to be? - I think i know the answer to this but just want to be sure.

Is the head calcualtion any different since I would be going vertically up to my roof to reach the panels? IE can a WhisperFlo 3/4 HP EE pump handle the addtional head of the panels?

I am assuming ALL of the routing to/from the panels happens AFTER the filter just like in more 'conventional' heater set ups. Is this true?

I am curious, because I only need mild water temp warming to extend my season and add just a few degrees during the hottest months. I achieve good tempratures in late June through Aug with the use of a solar cover, but to eek out an extra month or two of swimming could be worth the investment in solar (but for me fossil-fuel heating is not the way to go).