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Thread: OK to turn off water circulation in solar panels on hot day?

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    Join Date
    Mar 2012
    Location
    Central NJ
    Posts
    31

    OK to turn off water circulation in solar panels on hot day?

    We just got about 500 sq/ft of Techno-Solis solar panels installed in the backyard with a Hayward Aqua Solar controller and it works well, actually sometimes too well. Pool water early this week was close to 90. Which made me wonder, in the peak of the summer, if the water was to be too warm, can the water circulation in the panel be turned off during the day... but then could the panels get damaged with the overheating? I can't really find information on the subject, I understand though that I can cool the pool with the system (circulate water at night to radiate out through panels) which would be one option if they can't be turned off. Thanks for sharing your experience.
    21'x41' Mountain Lake, Filter Pentair TA60D, Pump Pentair SuperFlo 1.5 hp, SWG Pentair IC-40, light IntelliBrite 5g LED, Liner 27 mil Dynastie/Blue Granite, 2 main drains, 2 multidirectional hydrostream return inlets, 2 wall skimmers , 2 in-floor cleaning heads, Heating 500 sq Techno-Solis Solar Panels, Hayward Aqua Solar control

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    Join Date
    Jul 2010
    Location
    Philly
    Posts
    332

    Re: OK to turn off water circulation in solar panels on hot

    Quote Originally Posted by NomDePlume
    We just got about 500 sq/ft of Techno-Solis solar panels installed in the backyard with a Hayward Aqua Solar controller and it works well, actually sometimes too well. Pool water early this week was close to 90. Which made me wonder, in the peak of the summer, if the water was to be too warm, can the water circulation in the panel be turned off during the day... but then could the panels get damaged with the overheating? I can't really find information on the subject, I understand though that I can cool the pool with the system (circulate water at night to radiate out through panels) which would be one option if they can't be turned off. Thanks for sharing your experience.
    Your controller shuts off circulation to the panels every time the water temp reaches your set point. I have panels with a manual bypass. In the heat of the summer the water sits in my panels all day when I don't need to run them. When I run water through them, the water is near scalding coming out of the return. I wouldn't worry about them. They're designed to withstand those conditions where water sits in them and heats up without moving. You would have to reach near boiling temps or above to hurt them.
    Bill
    18'X4' 7600 Gal AG
    3/4 HP Pentair Pump
    Hayward S166T 100 lb sand filter

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    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,490

    Re: OK to turn off water circulation in solar panels on hot

    It isn't the panels that you need to worry about, it is the PVC pipe that can have problems. One installer told me of some issues in the central valley of CA where temperatures can get very hot. After the panels have been sitting in the sun with water in them and the pump shuts off, the vacuum from the draining hot water can sometimes collapse the PVC pipe. But this is usually in extreme conditions and with the VRV installed just above the pad. If the VRV is on the roof, then it should be ok.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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