Hello. (sorry my english)
I want to make a small cooler. I´m going to use a aluminium vat 80x80mm. In the sides and the top I´m going to isolate it and in tue bottom I´m going to put 4 peltiers. In the hot side I´m goingo to fix a copper plate whit coper pipe to the refrigeration.

The question is. I have no idea about what peltiers are the best. Is an experiment, so I don´t want to expend so much. I see some 12v peltiers that can consume up to 15 amps, what is a lot for me. But maybe in the future I can get this currents, so if I use these and instead 15amps, I give them for example 5 amps each, will they work at 1/3 of their power or is better use other with less power? I mean, to use this in the mean tome I get a biger power supply



Thank you

Best regards

 

Hello. (sorry my english)
I want to make a small cooler. I´m going to use a aluminium vat 80x80mm. In the sides and the top I´m going to isolate it and in tue bottom I´m going to put 4 peltiers. In the hot side I´m goingo to fix a copper plate whit coper pipe to the refrigeration.

The question is. I have no idea about what peltiers are the best. Is an experiment, so I don´t want to expend so much. I see some 12v peltiers that can consume up to 15 amps, what is a lot for me. But maybe in the future I can get this currents, so if I use these and instead 15amps, I give them for example 5 amps each, will they work at 1/3 of their power or is better use other with less power? I mean, to use this in the mean tome I get a biger power supply



Thank you

Best regards

Look for a used wine refrigerator or other device - you'll get the whole system, heat pipe, pelitier, power supply, thermostat. They do take a lot of power, not exactly a battery-operated device unless you want to port along some big lead-acid batteries.

 

You need to know:
1) ambient temperature, i.e. room temperature
2) target cooling temperature
3) volume of material you need to cool

TEC1-12706 is very popular, measures 40 x 40 mm and runs on 12V 5A = 60W.




The important parameter is the temperature difference, i.e. ambient temperature - target temperature.
Also it is very important to actively remove the heat from the hot size. Failing to do so will destroy the TEC.

Buena suerte!

 

Thanks for your answers.

I have looked for a wine refrigerator but I haven´t finde anything in my city, and I enjoy making this things.

About the TEC, I have just remember I have a PSU that can give 24V and 10 amps, so if I get for example 4, in series and parallel I can use it.

If I get a bigger PSU and buy a more powerful peltier, what I get? A colder temperature, a quicker temperature decrease or both?

Thank you

 

Peltiers are woefully inefficient as coolers. IMHO in most situations you're better off either with blocks of ice or a proper mini fridge. I'm tempted to suggest modifying a discarded office water cooler (the things that take the big inverted bottles of water), but having watched a friend attempt to fit one into a vintage ice box, it would really help to know a friendly refrigeration mechanic.