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proper solar sensor location

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  • proper solar sensor location

    I have a pentair suntouch controller controlling the valve for my DIY collectors in the garden (too far from the roof). The system compares the pool return water temperature to the solar temperature to determine when to open the solar valve. Pentair is celar that the solar sensor be mounted near the collectors, not in contact with them or the water. I think this is preventing me from heating the pool on cool sunny days. Does anyone have experience with alternate sensor locations?

  • #2
    I would imagine any near the panels would be best. Most i have seen are within 12" of the panels. You do not wanting it touching the panels but you want it to see the same sunlight that the panels get. If it where touching the panels it could read to high of a temp. If it is placed on a different surface than the panels have it might read to low becuase the surrounding surface may not get as hot as the panels thus not reading what the actual temp of the panels.

    Where is the sensor located right now?

    skeeter

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    • #3
      Hi, I'm looking for advice on this topic please! My sensor is on my pool house roof, but this is quite a long way from the panels and with tree growth obscuring the sun late afternoon it shuts the controller off whilst the panels are still in the sun. I'd like to move the sensor to where the panels are. Its about 70 metres or so but not difficult as I can run the cable along guttering. However, can I cut the two wire cable at it's connection with the controller and add in any 2 wire cable or is some special kind of electrical cable required? Also, is there any reason why a long length such as 70 metres or so would be a problem? Many thanks, Pete

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      • #4
        Originally posted by Peter Bonneville View Post
        Hi, I'm looking for advice on this topic please! My sensor is on my pool house roof, but this is quite a long way from the panels and with tree growth obscuring the sun late afternoon it shuts the controller off whilst the panels are still in the sun. I'd like to move the sensor to where the panels are. Its about 70 metres or so but not difficult as I can run the cable along guttering. However, can I cut the two wire cable at it's connection with the controller and add in any 2 wire cable or is some special kind of electrical cable required? Also, is there any reason why a long length such as 70 metres or so would be a problem? Many thanks, Pete
        The primary purpose of a pool water temperature controller is to send information about the temperature difference between the bulk pool water and that of the water in the collectors. Somewhat simplistically, the idea is to have the pump circulating pool water through the collectors when, and for as long as, the water in the collectors is warmer than the pool water (and note, usually by only a few degrees or less when operating normally). Other or less suited locations for meeting that goal will thwart that purpose.

        The controller usually/commonly has 2 sensors. One at or in the pool, in good thermal contact with the water in a place that has good circulation and where the local water temp. that's sensed is mostly representative of the bulk pool temp. The other sensor is, or ought to be located in a place and in such a way that it has good thermal contact with the water (or at least the collectors) where it can (somewhat) reliably determine the water temp. in the collectors. Usually, but not always, that's a place near the collectors outlet.

        Sensors located in places where they cannot sense, or cannot do a good (that is, reasonably accurate and reliable) job of sensing the (relative) temperatures of the water cannot do their job, and as a result, probably won't heat the pool water as effectively - or at all - as intended.

        Reads like your sensors are not in the best locations.

        Check/fish around websites for pool water solar collectors for more information.

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