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  1. #1
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    I cannot power that pelletier module : TEC2-25408

    Hello,

    I have tried to power that pelletier module with an AT power supply but I reached max -10°C or something

    so I ordered a 12V 10A power supply,

    as I measure the pelletier module, it really does not go up to specs

    barely -20°C (should <-30°C) and current is only half of the specified current

    pelletier:

    https://www.aliexpress.com/item/3238...662f6f04RWvMLA

    power supply:

    https://www.aliexpress.com/item/3299...3da24c4d7hBp9i

    fan: I am using a 12V fan with a 10x10x4cm CPU fan

    what am I missing ?

    sheers

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  2. #2
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    Re: I cannot power that pelletier module

    Do you have a full datasheet with I/V/ΔT curves? What's the expected hot side temperature for -30° cold side? Did you check the actual temperature?

    Most likely problem is insufficient heat sinking at the hot side.



  3. #3
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    Re: I cannot power that pelletier module

    yes, checked the temp with an ir temp "gun"
    I am indeed building a bigger cooler/double fan apartus



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  4. #4
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    Re: I cannot power that pelletier module

    It's generally no good idea to operate a peltier element with fixed voltage supply because for each combination of heat sink thermal resistance, ambient temperature and pumped power there's an optimal operation current respectively voltage.

    Said TEC2-25408 may need higher voltage, e.g. 14 or 15 V.



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  5. #5
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    Re: I cannot power that pelletier module

    I can try many different voltages
    yet, finding datasheets is not easy



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    Re: I cannot power that pelletier module

    please describe your heat-sinking - if any ...?



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    Re: I cannot power that pelletier module

    After all is done and said, this is a thermodynamic problem.
    -What is the fan’s airflow and under what static pressure?
    -What is the heatsink’s thermal resistance, with the calculated airflow?
    -What is the heatsink’s ambient temperature?
    -How many calories, joules, BTUs (or whatever thermal unit you wish to use) is the peltier module rated for? How does that compare to your thermal load?
    -What are the peltier’s losses, which the heatsink will also dissipate?
    My batteries are recharged by "Helpful Post" ratings.
    If you feel that I've helped you, please indicate it as a Helpful Post



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  8. #8
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    Re: I cannot power that pelletier module

    no idea... just trying to follow this tutorial : https://www.instructables.com/id/Pel...Cloud-Chamber/

    I'll purchase a piped cooler like the one he uses, this gotta work



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    Re: I cannot power that pelletier module

    without calculating the heatsinks required for each side and the watts you are ( hopefully ) shifting off the hot side - you are operating blind - very tricky to arrive at a useful working arrangement under this approach ...



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    Re: I cannot power that pelletier module

    Watch this channel on YT, you will find lot of interresting things about peltiers.
    Make no mistake between my personality and my attitude.
    My personality is who I am.
    My attitude depends on who you are.



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