Advise needed
 

Hi guys,

I finally got the server p/s like pictued above. The question is, how to get power.
With an old servo plug I got at least the fans running, running slowly.

But no power yet. Then I tried to connect some of the pins to the big plugs. And hey, I got some volts:
http://i52.tinypic.com/14j92bq.jpg

The fans are completely on now,and pretty loud too.

Detailed view on the pins
http://i55.tinypic.com/10d72as.jpg
like that, I get the power finally on.

but what is what, here some pics
http://i52.tinypic.com/2ztbu5t.jpg
http://i54.tinypic.com/df9e0h.jpg
http://i56.tinypic.com/2e1857k.jpg

so I think, the top three are minus/ground, the lower three contacts are plus.

I got my degree on the MIT, still I need your help :party:
I think I am on the right track. So I can solder three plus/minus cables? in total?

When I am right, I just got a very powerful p/s for just USD 3,47, not quite expensive for about 1000 watts...:smile:

Of course I will replace that bloody screw.

Thanks a lot for your input!

florian

finished
 

Hi there,

got it finished. I have changed the fans, the new ones are very quiet. soldered some wires, cleaned inside, not that much to do.

http://i52.tinypic.com/j61u84.jpg

Sufficient charging power for three chargers. costs: less then 15 usd in total.
florian

I like it :)

http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT

reckon that will be any good to convert?

I had a diff. server supply(53amp max) loaded with 45ish amps, took 7 chargers to do it, but it was still putting out a stable 12.22v:surprised:

Thanks Ben for pics with these type of supplies. I got similar ones just have Compaq on them instead of HP. I had just taken some pictures and was going to post them to see if anyone could help. Nice job and thanks for sharing Everyone.

There should a good selection of used power supplies hitting ebay shortly.:lol:

Nothen like usen "500Watt" to produce "50Watt"..... LOL

Got my HP sserver p/s the other day. Just soldered it up. It works great on my sound system in the shop.

Pics of the powered sound system?

Charging a 4s @32A with the Powerlab + 20 dollar PSU. 8awg wires were at 121F during charging.

http://i189.photobucket.com/albums/z...8/DSCF0582.jpg
http://i189.photobucket.com/albums/z...p/DSCF0583.jpg

Nothing special, just a cheap sony radio/speaker combo, 250w amp and a 8" sub.

If connecting two power supplies in series is so dangerous, how the hell maxamps did that???:surprised:

like RC Toy mentioned above I am surprised no one has mentioned this has gotta be the same power supply that Max Amps is selling for $80,
http://www.maxamps.com/Power-Supply-12V.htm

Thanks to the thread starter for posting this, I had been browsing around looking for a new power supply and came across this thread. I picked one up off of ebay for $15 + $12 shipping
Had I not seen this I was about to buy the Max Amps one.

there was a thread when the maxamps PS came out pointing out that they were the same thing ;)

Cool, well I am glad I found out just in time. I got my ebay PS today, cant wait to get it hooked up ;)

So I've been trolling eBay looking at supplies. Specifically ones that look to have good 12v amperage that I could use in series to get 24v, what I'm drawn to are the X0551 Dell server units (47.5a at 12v). Aside from the complexity of safely connecting them in series do you guys see any reason why these would not work?

As long as you have a way to turn it on, it should work great.

I don't know why I took this long to do this but I finally got me a 47A PS off the bay for a few cents under $18 shipped. It's going to replace my 26A ATX PS which still works and I will use for truing tires and such at home and as a backup. I was blown away by how small the server PS compared to the ATX PS and I really like the form factor as it makes it easier to carry it and my other CellPro 4S chargers to the track in one Pelican case on race day. It registered 12.58V with no load after I cranked it up.

Thanks to Snellemin and others who've contributed to this thread. Now I wait for my PL8 to show up so I can start working on my LiPos for the 2011 race season. Looking forward to the first ever 1.1s ET on 3S in 1/10 electric TF drag racing.

http://i256.photobucket.com/albums/h...108_214510.jpg

So, here's my "Charging Box" that I recently completed. I used the HP 47A server power supply and cranked it up to output 13.4V. While I was tweaking inside the power supply, I rewired the fan to run off the 5V output, so it's much quieter. So far, it still stays plenty cool. I put it into a modified Plano tackle box with a pair of iCharger 206B chargers (capable of charging at 20A each). I added a socket on the outside of the box for a detachable power cord. I had previously modified the power supply with a toggle switch, so that powers the whole thing up. There is a ton of space for all the miscellaneous charge leads and balance adapters. And finally I added an LED volt meter because I thought it looked cool :oops: So far, I'm really liking this setup.

http://www.nuibe.com/rc/chargingbox/charging_box_1.jpg

http://www.nuibe.com/rc/chargingbox/charging_box_2.jpg

http://www.nuibe.com/rc/chargingbox/charging_box_3.jpg

very cool... well done on that installation :yes:... been wanting to do something similar with the pair i have... what voltmeter is that? where can i find them?

Alien

This is the one that I bought:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=230363049931
There are many out there that would work, but be careful as a lot of them require a 5V power supply.

Very nice.

Oh.. thanks for the link and advice man... I'll do some searching again for suitable boxes that will fit all my charging/electric field gear and work on the install... will post up some photos when I'm done.

Alien

Kazuaki, I think you've hit on a really good idea there :yes:
Hope you're ok with the shameless copying of your idea, because I'm all over that :mdr: Good job!

I like this tackle box idea. I too shall shamelessly copy this.

Not a problem at all, that's why I shared it. One thing I just realized...it kinda looks like a bomb :gasp: So, be careful going near federal buildings or airports with it...

I too like the idea. However, if I might make a suggestion: To minimize power wire flex every time you open the box, how about mounting the chargers to a false bottom right above the PS? That would give you more room to store your adapters and provide a larger lipo tray for charging.

BTW: I see you were able to get a good stable 13.4v. What resistors did you end up using in the feedback circuit?

I ended up settling on 200ohm on the positive side and 22ohm on the negative side.

I did something similar a while back. Not as nice, but it worked.

http://i206.photobucket.com/albums/b...p/DSCF2565.jpg
http://i206.photobucket.com/albums/b...p/DSCF2563.jpg
http://i206.photobucket.com/albums/b...p/DSCF2562.jpg

That would work, but I guess I didn't see the wire flex as much of an issue.

BTW, for those that go looking for a tackle box, most of the ones big enough to hold the server PS will be 3 tray boxes. This one had 3 trays, but I removed the top tray. They disassemble easily.

I like that, nice and heavy duty!!

Another little update for this little PS unit.

I got another one of these and was doing my voltage boost mod when I accidentally discovered the ground connection for the sense/feedback circuit is not even needed. After doing some more playing around, a 1.5k ohm resistor between the main 12v terminal and pin 5 is all that is needed to boost the output to 13.2v.

BTW, the max voltage you can get out of this is around 13.5v. At 13.6v, the PS shuts down.

Also, for those that think the fan is a bit loud on 12v: If you run this PS at 25A or more for extended periods (>1/2 hour), the air coming out the back is pretty toasty. I figure even if this unit is 90% efficient, 35A @ 13.2v is 528w which will produce 53w of heat. That's quite a bit, so if you do turn down the fan, I wouldn't go too far.

Brian you're the man! Thanks for posting!! :smile:

Here's mine, but with a 42A PS. When I charge 2 lipos (3s 5800) at 2C (11.6A each for a total of 23.2A from the PS) it barely even gets warm. :intello:

http://i188.photobucket.com/albums/z...x/IMG_2180.jpg

http://i188.photobucket.com/albums/z...x/IMG_2181.jpg

http://i188.photobucket.com/albums/z...x/IMG_2182.jpg

http://i188.photobucket.com/albums/z...x/IMG_2184.jpg

http://i188.photobucket.com/albums/z...x/IMG_2185.jpg

http://i188.photobucket.com/albums/z...x/IMG_2186.jpg

http://i188.photobucket.com/albums/z...x/IMG_2187.jpg


Yes, the lid is burnt. After I went through the extreme hassle of making a false bottom that fit (major PITA) the charger did not fit. I was not about to toss all my work in the trash so I softened the lid up with a lighter and expanded the it a bit. Made it fit. :intello: I use the velcro from hobbycity to hold everything in place. Plus a side to barely fitting is it doesn't rattle around inside at all, even when upside down. The velcro is crazy, its a bear to pull the charger and PS out of the box. :lol:

I have the charger plugging into the false bottom so that I can unplug it from there and into some alligator clamps for charging from a car. :) BTW, the box is amazing. Makes charging easy, and portable while keeping it protected.

ok for a semi-noob. With the original ps, which main line do you use for the charger(outsides or insides)? Can you use it to power 2 chargers off of different sets of lines?

Ok BrianG I took off the hot swap connector like this http://sites.google.com/site/tjinguy...projects/HP47A
wondering whow would I put the 1.5k ohm in to boost volts and what watt of resistor did you use? I have 12.45 now.

Honestly, if you are getting 12.45v now, there really is no reason to mess with it. ~13.2v is not a whole lot more voltage for the work required. But if you still want to:

The pic below is the first PS I modded before I realized I didn't need as many wires, but all you need to do is attach the 1.5k ohm resistor to the red and white wires (the ground isn't needed). Resistor wattage can be your typical 1/4w.

http://scriptasylum.com/forumpics/ps47_b.jpg

In this pic, you can also see the jumper wires I added to turn the supply on without having to mess with the little pins.

Be aware that I cut the standalone purple and blue wires (-12v and 5v aren't used) and cut away the PCB where they attached to give me room for those white and red wires in the pic above.

Ok will leave be but I modded even further and took that whole board out per the link I posted before. It's at the bottom of the page.

Just finished mine and wanted to share it. What an awesome power supply that has tons of power. This thread is what got me started and I thank everyone here for your knowledge and support.

Terry
http://www.youtube.com/watch?v=KB_MghvoqHE

I just posted why you are getting 17v on your YT vid, but for some odd reason, it appears to be posted from peterscalab??