Mod 12VDC 32Amp Power Supply : Need Help! - Page 3 - RC Groups
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May 18, 2011, 01:51 AM
Registered User
himagain's Avatar
Originally Posted by jointer
I have 4 these units, any idea if they can be connected in series easily?
DC ungrounding preferred.
I did not looked inside yet, is there any pot for voltage adjustment?

Not sure as ive not tested it, you must make sure that the negative and case are not common to earth or you will effectivly short it out via the earth wire on the mains supply.

Maybe NYDI can comment on this as he's making a 24v unit

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May 31, 2011, 10:18 PM
Joe from New England
pete236's Avatar

Finished yet?

Originally Posted by nydi
Here my solution for 2 ESP 113 in serie (not yet completed...)

Fix the power supply with plastic bolts, so you isolate the ground to the case.

The AC ground (110/230V) you can connect with the case...
I've just gotten a few of these HP PS and was wondering if you had finished it yet?
Jun 01, 2011, 12:36 PM
Registered User
Any ideas, how to make the fan slower?

for the DPS600PB you can connect PIN4 to ground and the the noise would be fine

but what with the ESP113? is there a choice?
Jun 06, 2011, 11:58 AM
Registered User

Does some one know how much cooling these server PS need??
I want to disable the stock fan. And put the PS in a closed box with a 12cm normal PC fan. Would that be enough? So it looks almost like a normal Computer PS.

And does some one know what normal operating temp. are?


Jun 12, 2011, 07:44 AM
Registered User
The right pot controls the output voltage.
With PS control pins connected to ground as suggested here, turning the pot counter-clockwise upped the output voltage to 13.2-13.25V.
The purpose of the left pot is unknown to me yet, it seems not to be overvoltage protection, because moving at no load did not made the PS to shutdown.
Could it be current limit?
Jun 13, 2011, 06:06 PM
Registered User
Okay, the unit was switching off at 13.25V, it seems it is working at 13V.
The left pot could be OverCurrent Protection.
Turning it far left allowed me to push the PS very hard, i took 42A/12.8V with my charger for 2 minutes (without cooling).
That is almost 540W, enough stress test.
Turning it right was making the PS to shut down early.
Hope it will help someone.
Jun 20, 2011, 04:17 PM
Registered User
Two other units.
These did not liked voltage near 13V (switching off), so they are around 12.86V at no load, both tested independently at 38A continuous load.
Images - front, rear with Y cable with switch.

For DC side ungrounding, 2 front screws must be isolated from case.
Seems to work.
Jun 30, 2011, 08:25 PM
Registered User
By front screws do you mean the 2 screws under the fan?
Jul 01, 2011, 05:33 AM
Registered User
The 2 screws from 4, which hold the PCB to case, near output/fan.
Isolating them unground the PS on DC side.
If anyone will be doing it, you should of course test it with multimeter.
Jul 01, 2011, 12:25 PM
Southern Pride
everydayflyer's Avatar
I want to disable the stock fan. And put the PS in a closed box with a 12cm normal PC fan.
Many if not most will not operate without the fan(s) connected. Several have placed resistors in line with the fan's power lead to reduce fan speed.
Jul 01, 2011, 01:09 PM
Limbo with 30,000V...
J_Arner's Avatar
Originally Posted by jointer
The 2 screws from 4, which hold the PCB to case, near output/fan.
Isolating them unground the PS on D/C side.
If anyone will be doing it, you should of course test it with multimeter.
By isolating the DC side you eliminate the need to lift one of the A/C grounds, correct?

I will be sure to test the continuity, but want to make sure I understand what to do on the A/C side.
Jul 01, 2011, 04:11 PM
Registered User
By ungrounding on DC side, you need no changes on AC side.
Read the forum here, there are threads about safety and what to do.
Some are long.
There are some risks - you need to know what you are doing, at least in some amount.
Jul 01, 2011, 06:28 PM
Limbo with 30,000V...
J_Arner's Avatar
I have read quite a bit on the ungrounding from the AC side, but hadn't seen much info on ungrounding the DC side. Do you have a particular thread you are referring to? I will continue to read before making any supplies myself.

Thank you for the input and for the tests you've done so far.
Jul 01, 2011, 06:43 PM
Registered User
You can find it - as i did and choose to do it on DC side.
Deep in the 100A power supply thread, i think.
Or in the sticky...
Lot to read.
Jul 27, 2011, 12:24 PM
Registered User
Hi, I am a Ham Radio Operator and use this PSU for my Radio, max 22 Amps.
But I need 13,8 volt. If I turn up the voltage higher as 12,75 volt the PSU switches off or goes in Standby. Probably the voltage over protection circuit is doing that.
Has someone a idea how to change that?
Greetings from the Netherlands, Ben - PA2OLD

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