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+5v vs +12v

post #1 of 10
Thread Starter 
I have been wondering... Since the +5v rail has more amps than the +12v rail, so, would switching my TEC to +5v increase my tec's performance? If I used any terms incorrectly, sorry
post #2 of 10
they go by watts... although the 5v does have more amps.. only having 5V compared to 12v will decrease its performance..

take the 5V X amps = watts
12V X amps = watts

find the most watts and ull get the most performance
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post #3 of 10
Thread Starter 
So right now...

+5v rail=225w
+12vrail=216w

>.> Not much of a difference but the voltage so I guess I'll just stay with 12 like suggested. Thanks.
post #4 of 10
How are you cooling the hot plate of your TEC? With that AC64? :/
    
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post #5 of 10
Thread Starter 
What do you mean? I cool it with my A64 Freezer. There's nothing else to it. Im getting subzeroe temps like -4*c or -2*c. Avg is -3*c. *idle*
post #6 of 10
This is not the case, what Ace has pointed out is incorrect. A peltier will only draw a certain amount of amps at a certain voltage. I point to my favorite chart, the TEC undervolting chart, here. http://www.xtremesystems.org/forums/...04&postcount=1

Look up your TEC. Go to the 5V and 12V rows, you will find it draws only a certain amount of amps.

You cannot "force" amps into a TEC, it will draw however much it needs.
For example: The first 437W TEC that is on the chart.

@ 5V: Draws 6.14A, capable of transferring 15.3 W
@ 12V: Draws 14.74A, capable of transferring 88.3W

That is it; you can't "force" more amps into a TEC, you have to up the voltage in order for it to transfer more energy in the form of heat.

Burn
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post #7 of 10
they only draw 14 amps at 12 V.... u could put that on a dedicated 12V rail of these 3 an 4 rail powersupplys and it wont effect components...
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post #8 of 10
TEC's and all other electronice only draw however many amps they need to function. Its the voltage that matters. The more voltage you pump into a TEC, the better it works untill a certain point. So running it on only 5v would have horrible effiency compared to running it at 12v. Not to mention how weak it would then be.
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post #9 of 10
Quote:
Originally Posted by pbasil1 View Post
TEC's and all other electronice only draw however many amps they need to function. Its the voltage that matters. The more voltage you pump into a TEC, the better it works untill a certain point. So running it on only 5v would have horrible effiency compared to running it at 12v. Not to mention how weak it would then be.
Actually, technically it would be slightly more efficient at 5v, producing less of its own heat versus heat moved. However, if your heat source is greater than the peltier's heat pumping capability (determined by the wattage at the given voltage) than it will be overloaded and overheat.

Effective would probably be a better description. It would definitely be more effective at 12v vs 5v.
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post #10 of 10
Yeah, efficiency vs. effectiveness is the name of the game when you undervolt a TEC...

As you decrease voltage, efficiency increases, but effectiveness decreases.
As you increase voltage, efficiency decreases, but effectiveness increases.

So, we work out what works best at a given voltage- I can fine-tune my Meanwell from 12-15 volts, which gives me a little bit of wiggle room as far as voltages are concerned.
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