Meanwell Question
 

I have the chance to get a...

Meanwell Sp-300-24

or

Meanwell Sp-300-48

for $20 usd.

now.. No so sure about amps volts and such, but could this be used for a 226 watt pelt? If not why not, if yes why yes

Pelt Specs
Maximum operating temp: 125 C

Imax = 24 Amps

Qmax = 226.1 Watts

Vmax = 15.2 Volts

Delta Tmax = >67 (C)

Size = 50mm X 50mm X 3.10mm




Thanks :)

Model Number SP-300-24 DC Output Voltage (V) 24
Output Voltage Tolerance (%)±1
Output Rated Current (A) 12.5

Ok these are the spec’s for that power supply, now what are the spec for that pelt? It’s hard to say yes or no then why without having all the numbers.
;)

Oh my bad, updated in the first post;)

If not could I use this for any other pelt? Or mod it to work with that pelt?

Pelt Specs
Maximum operating temp: 125 C
Imax = 24 Amps
Qmax = 226.1 Watts
Vmax = 15.2 Volts
Delta Tmax = >67 (C)
Size = 50mm X 50mm X 3.10mm

It's a 24V PSU and a 13.5V peltier. The Vmax of your peltier is 15.2V, so 24V is way too much.

Well, could I get a different PSU besides meanwell... It has to fit in my budget so about 80 bucks for a PSU, I was considering an Enermax... Um this one

http://www.newegg.com/app/ViewProduc...ion=17-103-443

http://images10.newegg.com/productim...103-443-02.JPG

bad link. I wouldn't personally run a 226W pelt off an ATX psu, but there's no reason why it won't work. Look on www.ebay.com and www.labx.com for other options. I am betting you'll find something that'll work.

Alright Ill look around, but this PSU will be just dedicated to 2 pelts, the 226 and a 80... This COULD work though right? Ill still search around. ( link fixed )

yea it'll work. You may need to put something on the 5V rail as well to pull a bit of load and make PSU give a full 12V. Just stick a DMM probe into the 12V molex and see.

Another option would be to get a 172W pelt instead of the 226; the 172s are rated up to 24V. The Meanwell can be adjusted +/- 10% so 21.6V minimum.

I must advise against putting pelt psu into the case; they get pretty hot and will noticeably raise case temp in their vicinity. In this respect the ATX PSU may be a better choice I guess.

Great :) Ill check out the other pelts. I think ill just build a little extrenal box for the psu, what could I use to dummy the 5v? Dimm probe.. Where could I grab one of these... What else could Do this? Also would that Enermax be the best choice of those type PSU's ? Seems decent and cheap.

Thanks pHaestus for all your help

DMM = digital multimeter. Something to test voltage. Under $10 at Radio Shack or automotive stores or pretty much anywhere.

I am not sure what the best thing to put on the 5V would be. I have seen people use light bulbs for their case, but I dunno if I would want to keep them on all the time. It may not even be an issue with newer PSUs but it is something to look into. You may not even miss that 0.5-1V anyway.

Bruce at Cooltechnica actually uses a peltier to cool his Mean Well PSU:

http://www.cooltechnica.com/personal...ra_PSU-TEC.jpg

funny but effective I am told

LOL wow thats crazy. But I guess you can cool anything now a days. :) Another question.. yes sorry lol

Would it be more effective to.....
Have a CPU cooled by that 170watt pelt @ 24v run on that 24V meanwell or 226 that runs at 15V on a 12V line which would make it , god im horrible at math. dont know lol run lower than it should.

Then instead of the 80watt Pelt on my GPU, have it the 120watt which alos runs at 24v

and does the size matter of a peltier for CPU? i mean does 50x50 have a better advantage than a 40x40, or doesnt matter?

ALSO ANOTHER STUPID QUESTION!

I heard people saying with Pelts on a GPU, you could freeze the core in windows... Well is this true? and could I turn off the pelt and have everything run still and work?

You will find that peltiers lose very little in performance by undervolting them slightly. The 226W at 12V should be right in its sweet spot. I think this would perform a good bit better than the 172 at 24V. I don't have very much experience with pelt cooling GPUs, but I would guess that they aren't locking up from coldness. More likely they are locking up from it being really hard to insulate them fully and from the entire card getting chilled by the peltier due to all the copper traces. If you turn off the peltier then it will act like an insulator and may cause overheating. You might well be able to run it at a much lower voltage though when not running games. Shouldn't be too hard to rig up a rheostat for it. You'll need something that can deal with 5-6A (80W/12V) though so a fan controller built on the LM317 or LM350 is not going to work.

Any possible way to rig my sunbeam rheobus into doing this? If not, I have a fan controller on my Aero 7, could I take the Postive Wire on the pelt and splice it in with this?

I think I will just go for the 24V meanwell, if I can still get it. If not then I will definetly go for the extra PSU.

You don't want a 24V supply for running those TEC's.

It would only be useful if you were going to put a switching voltage regulator in between that supply and the TEC's. It doesn't sound like you are going to do that.

You want a 12V supply rated for 30+ Amps to power those TEC's. From what I've seen, I'm not sure I'd trust an Enermax though. A dedicated supply would be best, but if you must use a PSU, a Fortron/Sparkle supply may be a better choice.

Ill check those out.. Where could I get a switching voltage regualtor if I plan on that meanwell psu?

Would this work ?

http://svc.com/ac50dufanp4r.html

http://svc.com/raid500watal.html

Which is better?

Im so just confused.....

Would they work? Let's do some math.

Now, the first thing you want to do is determine what the wattage for your targetted TEC is at 12V. Say that it is a 226W at 12V. No, the 226W TEC isn't 226W at 12V; that 226W rating is probably at 14V (correct me if I'm wrong on that, since I didn't look up the datasheet).

Current = Watts / Volts
Current = 226 / 12
Current = 18.83 Amps

Now, pick a power supply capable of supplying 10% or more so that you aren't running right at the edge. That means picking a PSU capable of handing out 20A.

Would an ATX PSU work? Probably. But, an ATX PSU is designed to work with a PC, so you aren't using it in the normal configuration. That means that the +12V rail may not be regulated to +12V unless the +5V rail is being used. Dedicated power supplies are much more robustly built and have better implementations of things like overcurrent protection. And they may be much more efficient. Of course... they cost more.

Great info Brian !

Now how would this work on that 300watt 24v 16amp meanwell I could get for practically nothing.

Would I need to regulate the voltage or anything if I use....

172W DRIFT 0.8 Potted!!
Imax = 11.3 Amps
Qmax = 172 Watts
Vmax = 24.6 Volts
Delta Tmax = 69 (C)
Size = 40mm X 40mm X 3.2mm

AND

120W DRIFT 1.15 Potted!!
Imax = 7.9 Amps
Qmax = 120 Watts
Vmax = 24.6 Volts
Delta Tmax = 69 (C)
Size = 40mm X 40mm X 3.4mm

Meanwell stats
Model Number SP-300-24 DC Output Voltage (V) 24
Output Voltage Tolerance (%)±1
Output Rated Current (A) 12.5


How could this work?

Thanks again

If you have pelts that have V(max) as 24V and your power supply is putting out 24V, yes they would work. Separately. Remember that you can add current.

What is 11.3A plus 7.9A ? Is that under 90% of the max current rating for your desired power supply?

Remember, though. The optimum efficiency of a pelt is not at Vmax. It is at about 80% of Vmax if I remember correctly. So, they would probably be most efficient at about 19V to 20V. Get the TEC datasheets and mfgr recommendations for the optimum voltage. Vmax is not necessarily optimum.

This is where adjustable power supplies shine.

So if I understand correctly. ( been reading a lot of threads lil confused)

If i hook up BOTH of those TEC's parrallel it will run fine
It will run even better if the meanwell psu ran at 20v?

If im understanding correctly, then does the meanwell psu have a voltage adjuster on it? If not could I go buy 1 ?

edit.. Reread some posts. The lowest this PSU can go is 21V, this would be okay?

No it won't work. Your PSU supplies how many amps? I'm trying to get you do the math, here.

What is 11.3A plus 7.9A ?

19.2


Edit- :eek: I get it, I wasnt adding them together so I thought it all ran seperatly! :p So, would this just be effective for a single Pelt?

Yes. Or you could run the TECs in series off of a single PSU at their much reduced 50% of Vmax. Instead of getting 24V, each would get something like 12V (TECs are non-Ohmic devices so they don't really act like resistors).

(EDITED to change "parallel" to "series")

I think I will just get it for a single Pelt

Now would this 172 watt pelt still get frosty temps?