Solar plumbing - Do I need a second path to isolate the solar?

jimmyfloyd

Member
Jun 21, 2013
8
I am working on Plumbing my solar panels and have a question about necessity. THe majority of the diagrams I see have the 3 way valve as the only path for the water exiting the pump/filter. THe value therefore needs to be used to manage which direction the water goes.
For example:
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Now, I did se one diagram where there is a bypass section using 3 valves so that you can completely bypass the solar, or use it to limit the amount of water going to each. Example from Hot Sun Solar Pool Heating l How Does a Solar Pool Heater Function?:
fig1.webp


Is this bypass loop necessary? I am in Upstate NY, so the pool is only open 4-5 months out of the year, and closed otherwise. If it is not needed, that makes the plumbing much simpler.
 

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
14,735
Pleasanton, CA
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You don't "need" the bypass because the solar valve can act as a bypass too if needed. It just isn't as convenient as a separate bypass.
 
Last edited:

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
14,735
Pleasanton, CA
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
I do not have one in my system but I have a VS pump so I control the flow with that. With a single speed pump, there might be some value having one but again, bypass can be accomplished with the solar valve too.
 

jimmyfloyd

Member
Jun 21, 2013
8
Finally finished plumbing this up and did go with the bypass. While not completely necessary, since our pump is only a 3/4 hp, I liked the piece of mind in case we upgraded. Next is to figure out how to add the Hayward Solar Controller into the mix.
 
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