Can I mix 1 1/2 inch pipe with 2 inch for solar system

Jul 17, 2013
13
Hi
Given Covid, we ordered the flexible pipe to hook up our solar system online. We didn’t have it at our old house, so we have made the newbie mistake of measuring the outside of the pipe instead of the inside. Now I have a bunch of 2” hose and it seems that our pump and pool has 1 1/2” pipe.

i assume that going from 1 1/2” to 2” to go to the solar panel would reduce the pressure too much but before reordering everything, I thought I would check that I really can’t use it.
Thanks
 
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