View Full Version : dual psu 4 tec
benonmsn
10-06-2003, 12:35 PM
hi.. first post.. i luv u guys.
i have a dual psu case, very large, server style. a 226w tec and a 80w, cpu & gpu, respectivly. now rather then a psu for the tec like a meanwell or whatever. can i mount a 2nd psu, short out some pins to get it to be on, and still use a relay and timer. i.e turn on comp - pump and tec activate - 30 sec later computer turns on etc. ive been looking thro posts trying to see if soemthing like this was already asked and i could not really find anything. basically i want to not buy a dedicated psu when i have half a dozen turepower 430's (should be enough for JUST a 226w and 80w tec????) and to take advantager of the space for a 2nd psu in my case.
saaya
10-06-2003, 06:28 PM
lol welcome to xtremesystems :D :toast:
i think nebolous was running two psus in parallel to power tecs. use the forum search, there were somethreads about this in this part of the forum.
as long as you only want 12v from the psu's youll be fine, just connect them up and short the green to ground to start it up :)
id use 2 antecs for the tecs and then one for the pc making 3 in total however.
]JR[
benonmsn
10-07-2003, 09:59 AM
u dont think a 430/450 is enough for a 226 and a 80? thats a theoretical 306 watts.. 1 psu for the tec: use 1 system of molex for the 226 and another for the 80. and then the other psu for the mb and hdd and such..i thought an antec 430 would be enough for the 2 tecs =/
226 + 80 = 306 correct. Although that isnt the power used by the tec its the max cooling power.
306 x 1.6 = 490watts of power to run them tecs.
]JR[
benonmsn
10-07-2003, 10:42 AM
how bout a Antec TRUE 550 psu for the tec's and call it a day...?
saaya
10-07-2003, 11:05 AM
why x1.6 jr?
benonmsn
10-07-2003, 11:13 AM
watts = amps x volts.
x 1.6 came out to the right amount, however im not sure how he came up with it. it was right non the less :banana:
226 watt tec = 15 VDC 24 amps 360 watt-ish
80 watt tec = 15 VDC 8 amps 120 watt-ish
480 watts of power to run them. thanks for refreshing me on my electronis theory, its been many years.
so you think an antec 550 will handle that? i dont see any reason why it would not
As far as I'have read elswhere (manufacturesrs sites) it goes like this.
Every TEM (Thermoelectric Module has certain ratings:
Imax = max amperage which module is able to draw
Vmax = max voltage module is rated to run without failing
Qmax = max amount of heat energy a module can pump.
The most popular modules are rated Vmax 15volts, Imax depends on tec's power.
Power consumption is calculated by multiplying Imax by supplied voltage (226watt pelt has Imax of 26A, if you power it from 12volt supply it'll draw 26 x 12 = 312 watts of power.
The important rating to watch for is Imax.
Compare it to your PSU 12v amperage rating (check if it is not saying in specs that lets say 33A 12v rail is combined with +3volt line - highly unlikely but MUST check for REAL rating, not combined).
80watt pelt's Imax is 10A so you need a PSU with 36A 12volt line rating to power 226 and 80 watt pelts from it.
If its 33A it's ot going to be a problem, you'll not blow your PSU, it'll only lower 12volt rail voltage to compensate :)
benonmsn
10-07-2003, 02:02 PM
thanks alot, i was not considering an indepentant amp rating from 12v. i was looking at the combined. im looking at psu now with just the 12v amp rating in mind
Sparkle Power 550W Power Supply MODEL FSP550-60PLG
output voltage minimum load MaximumLoad
+3.3V 0.4A 27A
+5V 3.0A 29A
+12V 1.5A 36A
-5V 0.0A 0.3A
-12V 0.0A 0.8 A
+5V sb 0.0A 2.0 A
ENERMAX EG651P-VE(FMA). 550W
output voltage minimum load MaximumLoad
+3.3V 0.3A 36A
+5V 0.3A 36A
+12V 1.5A 36A
-5V 0A 1A
-12V 0A 1A
+5V 0.1A 2.2A
:confused: get the enermax? :confused:
Holst
10-07-2003, 03:29 PM
Id trust the sparkle to live longer.
But if your going to use TEC you will be beter off looking on ebay for a dedicated PSU. I have a look for CB radio stuff they are usually high amperage low volts and often dead cheap. JR has got some great bargains in the past.
Originally posted by saaya
why x1.6 jr?
Cos i said so :p:
Do the math, if you take imax x vmax of any tec and compare it to qmax (i.e. watts pumped) its always very close to 60% less than input power.
Its just me being lazy, i cant be bothered about looking up the specs for tecs all the time.
adding 60% to q is just multiplying by 1.6
and yes especially if you are in the uk ebay have some very high quality psus cheap.
]JR[
Originally posted by ]JR[
Cos i said so :p:
Do the math, if you take imax x vmax of any tec and compare it to qmax (i.e. watts pumped) its always very close to 60% less than input power.
Its just me being lazy, i cant be bothered about looking up the specs for tecs all the time.
adding 60% to q is just multiplying by 1.6
and yes especially if you are in the uk ebay have some very high quality psus cheap.
]JR[
I'll go and check ebay straight away :)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=3670&item=3433879577
I got a few of these, the guy has lots of them so just email him and offer to buy some @ £15 + del or something :)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=3670&item=3433879579
would work also well.
The main 5v line is on a split ground to the rest of the lines on the first one i linked, and the lines are adjustable +/- 10%, so putting the 12v and 5v in series and adjusting to min gives you 15.3v at lots of amps, enough for dual 220watt tecs.
The rated amperage is at passive cooled also, it doubles almost with a fan, so then thats 4 220watt tecs ;)
Being a smps it does need a load on the main 5v line to operate properly but thats not a major problem, either a 0.5ohm power resistor or a tec will suffice.
]JR[