Im putting up some new solar panels and found a spot for another 4x8 piece on a lower level of my roof. However I'm unsure where to tie in the lower panel to into the other 5 panels. I'm thinking "b" and put a relief valve where "a" is and another relief valve where "c" is. Does that sound correct for the water to drain properly?
Also on the return to the pool, there is a 14ft drop that currently has a 1 1/2" PVC from the old solar. My solar is half 1 1/2 (old) and half 2"(new) panels and all 2" pipes. I was told that I should keep the vertical return drop from my roof at 1 1/2 and then plump everything else with 2" because of "cavitation", I think that what the solar guy said, or maybe he meant the the bigger the pipe for the drop could cause the solar to colapse on themselves. Sounds improbable but just wanted to see what you guys thought since I want the best possible flow. I really want to change everything to 2" pipe. (my pipes to my pool are 1 1/2 underground. Everything above ground is now 2" since i've replumbed everything. Thanks.