A simple high quality 12Volt 100Amp Power Supply- Part1 - Page 100 - RC Groups
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May 03, 2012, 12:54 AM
Frankenstein recycled packs
rampman's Avatar
IMO, pricey if not converted for rc use. In line if plug-n-play.

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May 05, 2012, 01:27 PM
"cheap, small, lightweight"

Compaq/HP DS-SE2UP-AB silent Fan mod

Cool, now I've got a pretty decent power supply that's almost un-hearable.

Just get a silent 80mm fan (e.g. Arctic F8 Pro TC) and connect it to one of the
red and black wires that go to the DB-9 connector. The fan blows out so you
have to make sure that only the opposite side of the case is open to get good
airflow (I used shrinktube).

Unfortunately, the two holes at the backside do not fit for an 80mm fan, so
I used only one screw plus 2-component glue to secure the fan (I didnt't like
drilling because of the metal flakes ...).

See Post #1251 for instructions on howto make it run and more photos:
May 05, 2012, 04:13 PM
xandrios's Avatar
Hey Rodizio.

That's a nice setup.

And thank you for putting in the time and effort to get your PSU started.

Can you also post your instruction link (Post #1251) in this thread.


Many people will find it useful.
Last edited by xandrios; May 06, 2012 at 09:56 AM.
May 05, 2012, 08:14 PM
Registered User
Originally Posted by flarssen
Same PSU? If so, I posted some info here: https://www.rcgroups.com/forums/show...&postcount=731

I don't think it's the same. I'm talking about the NPS 700ab.
May 05, 2012, 08:22 PM
Nelapaty's Avatar
Originally Posted by chriscap
I don't think it's the same. I'm talking about the NPS 700ab.
Have you checked the how to convert a server psu thread..anyways is this what your looking for? this is dell NPS 700AB
May 05, 2012, 08:44 PM
Registered User
I'm looking for a way of isolating the ground so I can run in series. I have seen that site and it appears that he has done it, but doesn't give any instructions on isolating the DC ground. He just isolates the AC ground. Not a huge fan of that as it's not as safe.
May 05, 2012, 09:51 PM
Nelapaty's Avatar
pm to kiloone seems like hes isolated the groundhttps://www.rcgroups.com/forums/show...&postcount=444
May 07, 2012, 07:00 AM
"cheap, small, lightweight"

Fan airflow direction

Having converted some server PSUs now, I'm wondering about one thing.

Almost all of them have the fan 'pushing' air through the PSU case, is there
maybe a special reason for that?

Usually, as far as I know, 'sucking' the air through the case (i.e. blow out)
gives better results, and now I'm wondering if I shoud reverse the fan on my

Has anybody tried that, or can give theoretical information on that topic?
May 07, 2012, 10:59 AM
Frankenstein recycled packs
rampman's Avatar
The push through the case to also vent the main CPU case of the server. IMO, don't change it. You could be creating a hot spot if you do.

May 07, 2012, 02:19 PM
"cheap, small, lightweight"
Originally Posted by rampman
The push through the case to also vent the main CPU case of the server. IMO, don't change it. You could be creating a hot spot if you do.

No, actually with most 19" rack servers (atleast the ones I've seen) the airflow
through the case is from front to back. With the PSUs being at the back, they
receive air that has already been warmed up by the other components of the
server (CPU, mainboard, harddrives, etc.).
May 09, 2012, 03:40 AM
xandrios's Avatar

Astec/Emerson DS-2900-3, Sun ZFS Storage 7720 PSU (12V 240A) Full Pinout

Astec/Emerson DS-2900-3, Sun ZFS Storage 7720 PSU Full Pinout.

220V Input. 12V@240 2900W Output

The provided pin outputs are flipped versions of the other.

C6=C1 C2=C5 and so forth.

Test against ground and 3.3Vsb pins for correct pinout.

Connect Ps On and Ps Kill to ground to power up.
Last edited by xandrios; Sep 07, 2012 at 08:56 AM.
May 09, 2012, 10:36 AM
Registered User
hey xandrios,

i gave up on that FS011U psu.. no way to get it to run. so i went over to a poweredge 2800 (DELL 7000815-0000) psu wich starts and works well, got those "hurricane" fans quieter with the voltage divider method and now i would be happy to rise the voltage a bit. i get 12.05V without load. no pots inside. any suggestions? searched the whole thread but got no infos about that.

edit: drops to 11.99v unter 20Amp load
Last edited by vnt17; May 09, 2012 at 12:03 PM.
May 09, 2012, 06:03 PM
xandrios's Avatar
Hey vnt17.

The DELL 7000815-0000 PSU doesn't have external +V and -V sense lines so you can't adjust the main output voltage via the external pins.

The only way to kick up the main output voltage would be to connect pin A2(12v current share) to pin A4(3.3vsb).

That should give you a voltage boost to around 13.2v - 13.3v.
Last edited by xandrios; May 09, 2012 at 08:13 PM.
May 10, 2012, 01:43 AM
Registered User
is it possible to use that pin for voltage regulation AND fan control? or is there any other way to slow down the fans?
May 10, 2012, 05:14 AM
xandrios's Avatar
It may be possible to use the current share pin for double-duty,

but the desired results would be compromised.

You can simply short pin B2(fan control) to ground to slow the fans down.

Then connect pin A2 to A4 to get the voltage boost.

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