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13.8volt 20-25amp power supply for pelts!!!

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peewee

Member
Joined
Apr 23, 2001
we use this company to buy laser diodes from, i went on their site and they have a bunch of stuff overclockers might like, led's, fans, cheap to
they have a power supply that is 13.8volt 20-25amp
would run a 156watt pelt great...
check the site out mpja.com do a product search for 5386ps , and lemme know what you think of it, its 99 dollars,,,
 

schmidty

Registered
Joined
Dec 17, 2000
Location
Portland, OR
I've got that power supply, but I bought it from radio shack awhile back, and paid 10$ less ;-).

The only issue i have with the 20-25 amp (mind you 20A is its continous rating) is that the posts are larger than normal sized posts. The posts that work in my 8A PS don't work in this one (well they don't just 'stay' there). Understandably, this is due to a much larger current being drawn thru the cables... but then i look at the itsy bitsy wires on the pelts and i wonder how much restistance those are adding to the system...

Its not really had any use (as of yet... but there are plans).

cheers!
 
OP
P

peewee

Member
Joined
Apr 23, 2001
schmidty (Jun 15, 2001 01:31 a.m.):
I've got that power supply, but I bought it from radio shack awhile back, and paid 10$ less ;-).

The only issue i have with the 20-25 amp (mind you 20A is its continous rating) is that the posts are larger than normal sized posts. The posts that work in my 8A PS don't work in this one (well they don't just 'stay' there). Understandably, this is due to a much larger current being drawn thru the cables... but then i look at the itsy bitsy wires on the pelts and i wonder how much restistance those are adding to the system...

Its not really had any use (as of yet... but there are plans).

cheers!

what do you mean posts??? the wire terminals?
 
S

SPLEEN

Guest
I believe that the correct voltage for that pelt woulb be 15.1 volts @ 10.3 amps, pelts will not work properly if they dont have right ratio of amps to volts! I just bought a power supply on ebay for 20 bucks adjustable up to 30 amps.
 

Badger

Member
Joined
Mar 11, 2001
SPLEEN (Jun 15, 2001 12:06 p.m.):
I believe that the correct voltage for that pelt woulb be 15.1 volts @ 10.3 amps, pelts will not work properly if they dont have right ratio of amps to volts! I just bought a power supply on ebay for 20 bucks adjustable up to 30 amps.

You can't directly adjust the Amps, you can only adjust Voltage or the resistance. The amps are a function of the Voltage divided by the resistance of the curcuit (I = V/R.)

You also need to read up on how you rate pelts, a 156W pelt will actually consume much more power than 156W, close to 250W in fact.
The '156W' is actually the Qmax of the device (the heat load transferred at DeltaT of 0).
So a 156W pelt @ 15.1 (Vmax) volt will pull around 16 Amp not 10.3. Many people make the same mistake and end up with undersized power supplies.