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Thread: Pressure gauge placement for solar?

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    MJF54's Avatar
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    Pressure gauge placement for solar?

    I'm installing a solar panel and the manufacturer recommends a maximum pressure of 21 psi for the panel.

    i will have a home made pvc 3 valve diverter rather than a 3-way valve for the system and am not sure if the pressure gauge should be placed on the feed line or the return line for the panel to get the most accurate readings? I intend to place the gauge at the diverter, just after the filter. The panel will be 30-40 feet away

    Thanks,
    Mike
    Mike F.

    15' Above Ground Sharkline Matrix, Vinyl, 6,000 gal. Hayward XStream Cartridge Filter. TFT 50 Test Kit. Install 7/2014
    Raypack 150k BTU Natural Gas Heater installed 6-2016

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    Re: Pressure gauge placement for solar?

    Unless I am mistaken, the pressure will be identical throughout your system so placement of the gauge is not important.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Isaac-1's Avatar
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    Re: Pressure gauge placement for solar?

    Ok, first off you want pressure at the panels to be as LOW as possible, to maximize panel life, there is a good article or two on this at h2otsun.com

    Hot Sun Industries Case Study Rigid Solar Pool Heating Panel Issues with Pressure and Variable Speed Pumps

    They have a section in one of their pdf manuals also that goes into locating a pressure gauge after the solar diverter valve and subtracting the pressure from the height of the water column to get pressure level at the panels.

    Ike

    p.s. I have a flow meter and pressure gauge set up for my panels after my diverter valve here is a photo
    (note wrap around plumbing layout was needed due to existing equipment, holes in wall, plumbing, etc.)



    Also if you look carefully in the photo you can see I have a water flow of about 40 GPM and a pressure of about 8 psi, top of panels are located 16 feet higher than gauge so about 7 psi of water column (14.7 psi for every 34 ft water column fresh water)
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Isaac-1's Avatar
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    Re: Pressure gauge placement for solar?

    You might also want to read this Solar Pool Heating Challenges: Cheap Solar
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: Pressure gauge placement for solar?

    Thanks,
    The panel will be on the ground, I won't have to add for water column. Normal pressure on the filter is 20 psi so I think I am splitting a fine hair here. Just want to make sure I get max flow without bursting the panel/ causing leaks etc.

    Mike
    Mike F.

    15' Above Ground Sharkline Matrix, Vinyl, 6,000 gal. Hayward XStream Cartridge Filter. TFT 50 Test Kit. Install 7/2014
    Raypack 150k BTU Natural Gas Heater installed 6-2016

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