P.s.i after solar installation.

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It is hard to tell from the picture so do you know if that is the flapper type of check valve or spring loaded type of check valve. Does the filter check valve look the same?
 
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I am going to guess that is a spring type check valve, you may want to see if it has a model number or a psi spring strength listed on it, these can typically range anywhere from 1/2 psi to 5 psi for the springs, being a relatively short model, my guess is a strong spring.
 
From your drawing, I noticed that the full flow goes to the inlet header of the first array, with some water going up through the panels and the rest continuing to the inlet header of the second array. Other installers would have split before going to the first array, sending half the water to the first array and half the water to the second array. The outlet side is done the same, again adding a bit more friction loss, and likewise, it's normally tee'd back together after the second array. It will work fine, although I doubt the flow will be as close to equal in the two arrays as it would be if split before either array. Not a huge deal, just not the ideal way to do the split.
 
needsajet: It can be hard to get balanced flow doing what you propose depending on the actual roof top positioning, therefore there may be some validity in the method used, we don't have enough information from the drawing to conclude which would be best in this situation.
 
Do you have the length of runs for each of the pipes?


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At this point, I don't suspect the valve because that is inline with solar on or off and since you have much lower pressure with solar off, that is not causing the issue.

And no, I don't see a link.
 
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