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Thread: How much PSI jump do you get when solar turned on?

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    How much PSI jump do you get when solar turned on?

    Hi,
    Just got my solar hooked up today.
    I was wondering how many PSI your gauge jumps when you turn on your solar?
    Mine jumps from 15 to 25psi. If I keep the return vaule cracked a hair it goes to
    18 or 19psi.

    Is it ok to run full pressure through the solar at 25psi, when it normaly runs at 15psi?
    Thanks
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

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    Mod Squad JohnT's Avatar
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    Re: How much PSI jump do you get when solar turned on?

    Mine goes up about 4psi. Depends on your panel manufacturer how much pressure they can run on.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: How much PSI jump do you get when solar turned on?

    You can see what I have in my signature. Mine goes up 3 lbs. when I run it through the solar.
    Skinman

    16 x 32 Doughboy AGP
    Doughboy 17" AquaView sand filter
    1 HP, 2 Spd. pump
    (4) 2 x 20 Sunheater Solar Heat
    Solar cover w/reel
    TF 100 Test Kit

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    Re: How much PSI jump do you get when solar turned on?

    I was thinking 4 or 5psi might be about right. Mine jumped 10psi,
    so I cracked the other vaule to keep it at 19psi not 25psi.
    Just trying to figure out if its hard on your equipment to run it at 25psi?
    Thanks for the replies.
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

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    launboy's Avatar
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    Re: How much PSI jump do you get when solar turned on?

    Yeah, I'm pretty much in ine with the others. My PSI goes up 2.5 lbs.(9 to 11.5)

    Adam
    18' x 42" Intex Easyset Pool, with 16' x 52" deep end in the middle. Approx. 5500 Gal.
    Hayward Power-Flo LX 1 HP, 100# Jacuzzi Brand Sand Filter(Piped underground so it looks nice) 8)
    3 - 2' x 20' Solar Pool Heater Panels(roof mounted)
    Goin' on 9 summers...NOBODY thought it would last this long.
    Buried Portable Spa sharing pumps and water with pool (Almost complete project)

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    Rockcrawler's Avatar
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    Re: How much PSI jump do you get when solar turned on?

    When I turn my solar on, the filter guage jumps 10lbs, to 25, I have another guage located on the bottom 1 1/2" header pipe that reads 5 psi, I believe 3-5 lbs is the optimal (btu transfer)pressure for the solar heater according to the instructions. My pentair DE 48 filter say max pressure is 50 psi, I was concerned when I first installed it but after reading the specs for the filter I am comfortable running it that high, also I have to mention that my solar panels are on my second story.

    Rob
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

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    Re: How much PSI jump do you get when solar turned on?

    Thanks,
    What a great idea check my filter manuel for max preasure.
    After I find that out maybe I can relax. My top pannels are on a
    12/12 pitched roof, we seem to be running the same psi's
    That took all but 2mins,my maximum working preasure is 50psi.
    Thanks again
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

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    Re: How much PSI jump do you get when solar turned on?

    Most solar panels have an optimium flow rate. For example I have Heliocol 4x8 panels. These panels like to have between 4 and five gpm each. I have six of them so the total flow rate through the solar bank should be about 25 gpm. At high speed my pump produces around 75 gpm. To try and send the entire flow of the pump throug the solra panels would no only stress them unduly, but also cause the pump to be much less efficient. For this reason I have a bypass around the solar panels. The filter pressure jumps about 1 to 2 psi when the solar panels are place online.
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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    Re: How much PSI jump do you get when solar turned on?

    The only gauge I have is on my filter. If I gave all my information(ie pipe run,pump GPM,panels sizes) could somebody brighter then me figure out my flow rate? I am running 1 1/2 poly
    to 1 1/4 headers. Should I just keep the straight return line cracked a little?
    Thanks for the replies so far.
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

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    Rockcrawler's Avatar
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    Re: How much PSI jump do you get when solar turned on?

    Haybird,

    If your trying to figure out if you have enough gpm going through your solar, the easiest way to this without all the mathematical stuff is, on a hot day, feel your solar panels, if they are cool to the touch then you have enough gpm going through them, if they are warm, you need more.

    This link has a bunch of information, as well downloadable instructions to see if you have enough flow or not.

    http://www.powermat.com/index.html

    so far as keeping the flow control cracked a little, it depends if you are getting enough water through the collectors, on mine, I leave mine cracked a little, I used a paint marker and painted a line where the valve should be if I want solar on, that way when I have it off, and decide to turn the solar on I just line up the painted lines and I am good to go all the time no guess work, like I said before if you have your flow control cracked a little bit and your solars feel like pool temp you have optimal water flow, if the solars are warm you need more water going through them,

    Hopes this helps
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

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    Re: How much PSI jump do you get when solar turned on?

    Thanks,
    I read that link before I decided to go with solar. Very informative.
    I think I on the right track. Before I turn my panels on they are hot to the touch.
    When I turn them on they cool down. When I place my hand infront of the return
    the water is quite a bit warmer. Its only been a couple days but it seem my temp.
    is raising about 1* per hour. Thanks for all the help.
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

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    Rockcrawler's Avatar
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    Re: How much PSI jump do you get when solar turned on?

    Haybird

    Sounds like your on the right track, if you have a solar cover your temp will rise even faster
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

  13. Back To Top    #13

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    Re: How much PSI jump do you get when solar turned on?

    I have 12 solar panels with optimum flow rate of 4 GPM each so 48 GPM total. The PSI running through the solar is 24 PSI while the same 48 GPM with the solar off is 10.5 PSI so a 13.5 PSI difference, but I've got a long run of pipe to/from the solar and the solar goes a long distance across the roof. When the solar is off, I normally run the pump at 26 GPM which saves a lot of energy (1500 Watts with solar on; 275 Watts with it off at lower GPM).
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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