Not sure which is the appropriate forum but I'll start here.
Starting to put more focus on getting a solar panel heating setup this summer, the panels in question will be placed on my garage roof, distance from filter to panels (at the closest edge) will be +-25 linear feet of 1.5" pvc, about 10 feet of that will be vertical.
What I'm having difficulty understanding is: each night when the pump goes off part of the downstream section will drain out due to gravity, having a check valve after the filter will prevent the water traveling TO the panels from draining back, but the feed FROM the panel will partially drain when the pump stops. Now, when the pump comes on in the morning won't this mini-priming cause some water hammering? I'm thinking that's not good.
Can someone shed some light for me?
PS, in the pic below I'll be coming from filter to pool edge, follow it a bit and then straight across to the garage wall and then vertically up the wall to the roof.