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Author Topic: Peltier based aquarium cooler/heater?  (Read 2825 times)
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Denmark
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They're available but cost a pretty penny.  Here is a 120V to 12V@600W(50A):
http://www.amazon.com/Tiella-Lighting-800AT600T-Remote-Transformer/dp/B007JY3U66

Ouch, yes.  Salvaging an old PSU so much more economical (assuming I can get it to switch on, been trying for a couple of hours now jumping various wires, etc).

Connect the green wire to one of the black wires, and it will turn on (assuming it's an standard ATX)

In some cases the PC power-supplies need a minimum load on the 5V output, but it's not often that it's an issue.

// Per.
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Thanks for the help.  I was wondering if these BTS7960B  (or similar components capable of reversing a motor) will supply the peltier with PWM or with pure DC?  I've read that PWM for peltier is not ideal.
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Thanks for the help.  I was wondering if these BTS7960B  (or similar components capable of reversing a motor) will supply the peltier with PWM or with pure DC?  I've read that PWM for peltier is not ideal.

They can supply the unit with a fixed DC voltage in either direction, or they can be used to PWM the element. See item 41 at http://www.tellurex.com/technology/peltier-faq.php regarding PWM and Peltier elements. It's true that if you want to use PWM to run the Peltier element at less than full power, then this is not as efficient as running it off steady DC at a lower voltage, unless you use a series inductor to smooth out the PWM.
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Hello,
I was looking for the same project as I also need to cool a small size (25 l) aquarium to a constant 26-27 deg. c. and I would like to use a Peltier based solution + temperature ontrol loop based on Arduino.
Please let me know in case you completed the project.
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They're available but cost a pretty penny.  Here is a 120V to 12V@600W(50A):
http://www.amazon.com/Tiella-Lighting-800AT600T-Remote-Transformer/dp/B007JY3U66

Ouch, yes.  Salvaging an old PSU so much more economical (assuming I can get it to switch on, been trying for a couple of hours now jumping various wires, etc).

Momentary contact the green output wire to any black (ground) output wire.
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Denmark
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Momentary contact the green output wire to any black (ground) output wire.

If you're only making the contact momentarily, the power supply turns off again. There are absolutely no "smarts" in the power supply that will keep it turned on. The green wire needs to be pulled down to GND potential to keep the power supply turned on.

In a PC, the Chipset has the control over this signal.

// Per.
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