Help! : Need Electrical Expertise for a Horticultural Problem

Discussion in 'Band of Glockers' started by horge, Mar 22, 2010.

  1. horge

    horge -=-=-=-=- Lifetime Member

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    I need electrical expertise for a horticultural problem :)

    I've been caring for this silver maple (Acer saccharinum) seedling
    which I had brought in from Illinois last September. It's the only one
    out of four that didn't vanish in the floods of October (7 ft. deep
    inside the house), and it has doubled in size since then... but now
    is beginning to show signs of stress.
    [​IMG]

    Summer heat is REALLY on, and I tried to keep the soil and roots
    cool, by using a DIY styropor chillbox with a TEC (Peltier) module,
    both ends heatsinked with fans:
    [​IMG]

    [​IMG]

    The fans and TEC module were powered (in parallel) via AC-DC
    adapter, and it worked, cooling the chillbox interior, for all of 55
    minutes, before the adapter MELTED.

    The fans and TEC module still work, post testing with a 9v battery,
    but I could really use help choosing a proper power source...
    or confirming where I went wrong, lol... (I thought a 1A transformer
    would cut it... argh).


    The devices:
    Heibei TES1-12703 (DC Vmax 15.4v; Imax 3A)
    http://www.hebeiltd.com.cn/peltier.datasheet/TEC1-12703.pdf
    CD-R KING CPU fan TM-CF04 (DC 12v; 0.12A)
    CD-R KING CPU fan TM-CF07 (DC 12v; 0.12A)

    The failed power source was:
    NEWSTAR NA-1000RS (output 1.5 to 12v selectable; Imax 10000mA)

    I know that this species isn't supposed to survive here in tropical
    Philippines, but I really want to give it a shot.


    Thanks
    :)
    h.
     
    Last edited: Mar 22, 2010
  2. choi_tan2000

    choi_tan2000 BoG # 55555

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    bro try going to any comuter technician since you are using a PC fan.

    its really nice to try new things ako naman i tried to plant persimons. now it has a sprout already. mukhang mabubuhay kung bubunga yun ang tanong, i have some cherries also.

    good luck bro h.
     

  3. z_e_n

    z_e_n

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    Try using a fixed voltage output power supply. don't trust variable voltage output powersupplies on electronic equipment, they are unrealiable and the voltage sometimes drops under load. There are a lot of heavy duty 12VDC powersupplies in raon OR if you have an old CPU, you can use the cpu powersupply which has a regulated 12VDC output. hope this helps. :supergrin:
     
  4. horge

    horge -=-=-=-=- Lifetime Member

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    Thanks, choi_tan and Finzen :)
    I think I'm going to visit Raon right after the Holy Week,
    if I can't dig up an old PC Case somewhere.

    h.
     
  5. choi_tan2000

    choi_tan2000 BoG # 55555

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    good luck h.
     
  6. DyunyorBangBang

    DyunyorBangBang

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    hi horge

    Reason for melting, the TEC module (requires 2.4A@12Vdc according sa chart nya) and the 2 fans (.12A each) draws a total current of 2.6A versus sa 1Ampere rating ng Newstar power supply. Caused para mag-init yung transformer at possible masunog pa sya due to internal short.

     
    Last edited: Mar 25, 2010
  7. PMMA97

    PMMA97 TagaBundok

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    Maganda talagang pang kalso ng paso ang 1911 grips. :)
     
  8. horge

    horge -=-=-=-=- Lifetime Member

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    Muchos thanks for confirming the problem, DBB! :)
    I've asked my brother to buy me a 6A transformer tomorrow.

    :embarassed:
     
  9. DyunyorBangBang

    DyunyorBangBang

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