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120w+ TEC (peltier)
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Old 12th June 2005, 17:48   #1
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Default 120w+ TEC (peltier)

I'm looking for a bigger pelt to mod my portable refrigerator, anyone got a nice pelt which isn't used anymore?

Also, I need a better power supply to feed the thing, so i'm also looking for a VERY compact 220V AC->12V DC convertor which can deliver +7A on the 12V side.
(I already found small convertors which can handle 1.5A per piece, but will they work if I couple five of those in parallel?)
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Old 12th June 2005, 20:04   #2
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Originally posted by DUR0N
(I already found small convertors which can handle 1.5A per piece, but will they work if I couple five of those in parallel?)
can you give me some more information on the converters? It should work, I don't see a reason why it wouldn't
 
Old 12th June 2005, 20:20   #3
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Old 12th June 2005, 21:32   #4
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Quote:
Originally posted by TeuS

can you give me some more information on the converters? It should work, I don't see a reason why it wouldn't
http://www.velleman.be/images/products/2/pss1215m.jpg

when they differ even the slightest bit in voltage, you have two powersources working against eachother, which would be a huge waste of energy at +10A. Not to mention the heat that waste of energy brings along.
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Old 12th June 2005, 22:20   #5
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http://www.velleman.be/images/products/2/pss1215m.jpg

when they differ even the slightest bit in voltage, you have two powersources working against eachother, which would be a huge waste of energy at +10A. Not to mention the heat that waste of energy brings along.
true, but it depends on the voltage difference there is. how big would the voltage difference be?
peltiers already produce a lot of heat and any transformer (especially such small one) has a considerable loss when transforming power
 
Old 12th June 2005, 23:48   #6
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Originally posted by TeuS

true, but it depends on the voltage difference there is. how big would the voltage difference be?
peltiers already produce a lot of heat and any transformer (especially such small one) has a considerable loss when transforming power
Rated +/- 5% I think, so 1,2V max.
power conversion is over 80% so pretty good.
If I go for the 226w pelt, those little things won't last a second, or I need a dozen of them.
So i'll have to look for some kind of external transfo, like one from a laptop. Or build one out of a PSU.
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Old 13th June 2005, 05:50   #7
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does a TEC need a stable input voltage?
I've seen it once, you could just use one big-*** transformator with an average voltage the TEC needs
 
Old 13th June 2005, 11:02   #8
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Quote:
Originally posted by TeuS
does a TEC need a stable input voltage?
I've seen it once, you could just use one big-*** transformator with an average voltage the TEC needs
Doesn't need really stable voltage, but it has to be DC. So that would require some big-*** diodes to rectify the sinal wave.

Last night, I was thinking about making an external power source out of a PSU. Its relatively small, can deliver the power without a problem and with a bit of modding, it looks like a big laptop PSU.
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Old 10th July 2005, 00:40   #9
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I'm looking for a pelt too, someone got one for me? :d
 
Old 10th July 2005, 03:25   #10
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Quote:
Originally posted by Sharpside
I'm looking for a pelt too, someone got one for me? :d
I bought a 230w one from easypanic, but it's too big (50x50 instead of 40x40). I'm going to try to use it anyway, I'll give you a call when it fails.
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