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-   -   How to build a $20 47A power supply (https://www.rc-monster.com/forum/showthread.php?t=27554)

snellemin 08.09.2010 02:43 PM

Naah, ik ben een Surinamer. 250km is quite a distance for sure. And gas ain't cheap either.

VZW 08.09.2010 03:01 PM

How is this deal?
CLICK These are the right ones right?

VZW 08.09.2010 03:09 PM

Okay just realized that it is the GX I need to be looking at. The ones I linked to are of okay wattage but I don't know that they will be as easily converted.

Nard Cox 08.11.2010 08:08 AM

Yesterday evening I bought myself 3 of these, they shipped this morning.

They look pretty identical to the one in this thread BUT I've just found that the one in this topic has model nr : 321632-001 and the ones I've bought are : 338022-001. Hopefully it will work *fingers crossed*. I will let you know :)

Bmr4life 08.13.2010 02:12 PM

Nice. I did the same with two old server power supplies I got free from work. They're only 32a, but I only need one to get max wattage to my 208B.

Nard Cox 08.13.2010 02:35 PM

Quote:

Originally Posted by kazuaki (Post 375604)
The reason I can leave the jumper in place is because I added a power switch to the input side.

http://www.nuibe.com/rc/ps_switch.jpg

So far, it seems to work well...

Any pics on how you did that?

I received my three PSU's today. All three work flawlessly. :)

How do you shut down the PSU, just by pulling out the power cable? The fan makes a noice that is freaky loud ... definately need a solution for that. The PSU itself is also WAY smaller than I expected, even when I knew the dimensions...

Will post a pic tomorrow, going to solder some leads and stuff now. Thanks for the tip, this saved me a nice buck.

Metallover 08.16.2010 10:15 PM

I got mine up and running last week... Thing sounds like a hair dryer! Prank your roommate by putting it in the bathroom for awhile!:lol:

It would probably be possible to open it up a little bit and use multiple quieter fans.. I might have a go at it.

Thanks for the post snellemin!!

Nard Cox 08.17.2010 04:00 AM

The three victims:

http://lh4.ggpht.com/_oXx8nzDDQME/TG...A/P1060917.JPG

Opening it up:
http://lh4.ggpht.com/_oXx8nzDDQME/TG...4/P1060922.JPG
http://lh6.ggpht.com/_oXx8nzDDQME/TG...I/P1060923.JPG

The noisemaker:
http://lh5.ggpht.com/_oXx8nzDDQME/TG...0/P1060924.JPG

Possible solution?
http://lh4.ggpht.com/_oXx8nzDDQME/TG...c/P1060925.JPG



I tested the PSU's shortly with my EOS0615i Duo2. When charging a 4S 5A pack with 5A/1C the voltage is at ~12.35, when I put it at 10A/2C the voltage drops down to ~12.17v and I will only charge at ~9.75A, any ideas? I saw snellemin's stay at 12.8v @ 25.4A:

Quote:

Originally Posted by snellemin (Post 373341)
Naah, I haven't bothered opening it up. I wanted something simple and cheap. A regular ATX is too much work compared to this PSU. I will ask at work if boosting the voltage is even feasible with this PSU. I have no schematic of what the other pins do. I was pulling 25A last nite out of the PSU and the charger stated 12.8V@25A. When I get a few more, I'll open one up.

http://i189.photobucket.com/albums/z...8/DSCF0257.jpg


snellemin 08.17.2010 04:06 PM

Mine might be a fluke man. As long as it works right.

Nard Cox 08.17.2010 04:17 PM

True, but I though it was strange that it only charged at 9.75A and not 10A ... Oh well I will empty some packs soon and try charging two 4s 5a both at 10A/2C.

mistercrash 08.19.2010 02:33 PM

Pardon me if I seem ignorant, but is there any way to use those power supplies to build something as powerful as this.

http://www.rivergatedist.com/bulldog_90.htm

I had a Rivergate PS years ago and I loved it. It was a 30 amp model which was perfect at the time. But although they are really good and powerful from what I remember, they are way too pricey.

snellemin 08.19.2010 05:00 PM

Sure you can, but you will have to wire them up in series, which is dangerous if you don't know what you are doing.

ANGRY-ALIEN 08.19.2010 05:33 PM

Quote:

Originally Posted by mistercrash (Post 377370)
Pardon me if I seem ignorant, but is there any way to use those power supplies to build something as powerful as this.

http://www.rivergatedist.com/bulldog_90.htm

I had a Rivergate PS years ago and I loved it. It was a 30 amp model which was perfect at the time. But although they are really good and powerful from what I remember, they are way too pricey.

You can also look at one of these - HP DL580/ML570 G3 Power Supply 1300W Watts Power Supply


Photos below taken from rcgroups:

http://static.rcgroups.com/forums/at...g?d=1235262571



http://static.rcgroups.com/forums/at...g?d=1235262571



Alien

mistercrash 08.19.2010 09:13 PM

Quote:

Originally Posted by snellemin (Post 377398)
Sure you can, but you will have to wire them up in series, which is dangerous if you don't know what you are doing.

I don't know what I'm doing so I won't go that route :lol:

stampy 08.20.2010 10:43 AM

I was thinking of wiring 2 of the 47amp power supply's up. I'm no electrical engineer, so how would your house hold 120 volt circuit handle almost 100amps of power? arnt most circuits in a house only 15amps?


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