Pump Pressure with and without solar running

kr8434

Gold Supporter
Apr 13, 2014
17
Northern Virginia
I have a Hayward control switch which can redirect water to the roof to be solar heated. When I run with solar heating, my cartridge filter PSI is around 10-12. When I run without solar, PSI drops to 2-4.

How should I think about what the "right" pressure is with and without the solar heating turned on? I don't always have solar heating turned on, so it's not unusual to be running at that low PSI, and it seems too low to me.

Thanks.
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
12,999
Bedford, TX
kr,

Is the pump running the same speed when running with solar and without solar??? I would have thought it would be 10 without solar and 20 when using solar... :scratch:

But, I don't have a solar system, so lets see what our other members have to say..

Calling @pooldv

Thanks,

Jim R.
 

pooldv

Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
25,401
FL panhandle
It is normal and expected for the pressure to increase when solar is on. There is no right or wrong pressure in pool plumbing. It just is what it is.
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
12,999
Bedford, TX
Thanks pooldv,

I read the OP's post backwards... I thought he said his pressure was going down when in the solar mode, which did not sound right to me..

Glad to know it is working as it should..

Jim R.