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solar differential controller suggestions

mark schofield
mark schofield Member Posts: 152
Can anyone suggest a differential controller similar to the Goldline GL30 with the added capability of shutting down the pumps when the sensor (10000 ohm) reads a certain temperature. I would like to shut the system down when the collectors reach around 90 degrees. This is an older Grumman Sunstream system with a wall mounted heat exchanger, closed loop, and two pumps (one for the glycol and one for the DHW). Running fine since around 1978. I would rather not place another sensor in the collector, attach it to a relay, ect, ect.   Thanks for any suggestions.


  • Fortunat
    Fortunat Member Posts: 103
    every controller should be able to do this...

    Other than Goldline, and maybe a couple other really basic controllers, I think every solar controller you can buy will have a Storage and a collector max temperature that you can set.

    If you don't want to get on the roof and swap the sensor, you'll need a control that uses 10k sensors, like the Goldline. Te only solar controllers I'm familiar with that use 10k sensors are the Tekmar controllers. RESOL and all their third party branded controllers are all 1 k sensors.

    Tekmar has a basic dT controller. The Tekmar 156


    that should do the trick.

    Hope that helps,


  • Royboy
    Royboy Member Posts: 221
    IMC's Eagle 2

    controller provides high limit control and uses 10K sensors

  • mark schofield
    mark schofield Member Posts: 152
    solar controller

    Thanks for the replies. The Tekmar 156 will fit my needs. I want to shut the system down when the collectors get below 90 deg. Plus , the old controller has no LED's so a newer one should be fun.    Mark S
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