The following article is nothing more than a project report. I take no responsibility for how others may use this information.
After my success with the HP power supply (PS), I started a search for other models. That lead me to this Dell unit. I grabbed a pair to play with and this is what I have found.
After my success with the HP power supply (PS), I started a search for other models. That lead me to this Dell unit. I grabbed a pair to play with and this is what I have found.
The Dell 700W units (model NPS-700AB) Doing some research, I found out that these PS units come out of the Dell PowerEdge 2850 series servers. They are larger than the HP DPS-600PB PS and the fan is much louder but they do offer a few benefits over the HP, including 125W more output, better cooling and an output that is slightly adjustable. Notes, annoyances and updates
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The business ends. Wow no fan shield!
Mods complete.
12V output voltage adjustment pot.
Turn CCW to increase voltage. | The Dell 550W units (model AA23300) When I was researching other units I came across these 550W models but passed on them. After receiving the 700W models and finding out just how freaking loud they are, I thought I would try a pair of these. These small units are used in PowerEdge 1850 series servers. They have the same hot-swap plug as the NPS-700AB units and so far it seems to be wired the same. I took the units, modified them to work outside the server and intended to wire them in series. I opened up one and found out how the DC ground was connected to the case. Turns out it is only connected with one screw but I saw no easy way to disconnect it at the board. I used some heat shrink and a paper spacer to isolate it and that did the trick. I then attached them together and wired them in series, and that is what is pictured below. Notes, annoyances and updates
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