I have a rather small house but rather large pool, i have two small roofs and one larger roof and want to heat my pool. See attached file for basic layout. I have 2 4 x20 panels and 2 4'X12' panels. I'll be installing the two 4' x 20' panels (panels 1&2 in diagram) together as one patch on the large roof and one of the 4'x12' panels per small roof (panels 3&4 in diagram). I've been reading various posts on solar panel installs and everybody mentions parallel install. my question is specifically how is the parallel achieved. Bring one large pipe up to a common spot on the roof then branch it in 3 directions (do they sell a 3 way pvc branch?) then the return lines from the 3 patches all converge back into one pipe then into my pump shed? or do i branch all three lines right from the pump shed? I should mention I will have 3 patches, 2 of those patches ( 1 small and the 1 large) are at the same level one storey up, the third patch (panel 4 in diagram) is 1.5 storey up. My assumption is I would bring the return lines from the two lower patches up to meet the return line from the third patch at the highest point, but not sure if that is best.
Any help would be appreciated.