I would plan on connecting them all in parallel.
The panels have 1" copper pipe all the way through on BOTH the top an bottom of them.
BOTH ends of BOTH the top and bottom pipes would go from one panel to the next to the next.
That way all panels would be in PARALLEL. The incoming (cooler) fluid would go throw the lowest internal pipe to all the panels, flow up through all the the riser tubes, and move through all the upper tubes, then out to the solar storage/tranfer tank.
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