How to build a $20 47A power supply

[Nard Cox]

Byte, yeah I couldn't resists. Charging 4S packs with 50W takes ages ...

snellemin, ben je van NL naar Houston verhuisd?

I'll keep it in mind, altough it's a 250km drive for me which isn't free either. Think I will order 2 or 3 ... one for spare and another for selling.

[Big House]

I have a few old desk tops in storage that are not going to be used again. How can I convert one of those into a dependable PS for my charger? Thanks.

[snellemin]

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

[VZW]

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

[VZW]

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]

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]

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.

[Metallover]

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!

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]

The three victims:



Opening it up:



The noisemaker:


Possible solution?




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:

Originally Posted by snellemin

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.

[snellemin]

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

[Nard Cox]

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]

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.

[ANGRY-ALIEN]

Originally Posted by mistercrash

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:









Alien

[Thirdgen89GTA]

Originally Posted by ANGRY-ALIEN

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


Photos below taken from rcgroups:









Alien

Just bought one of these powersupplies. I was thinking of the 575w one originally posted, but the charger I want is 2x 400w chargers. While I don't own any 6S batteries alone my Jammin truggy uses 2x 3S 5000mah lipos and 2x 2S 5000mah lipos. I also have some adapters that let me charge two 3S lipos as a single 6S, same for 2S as 4S.

So I was figuring at a 3C charge rate that would be about 630w not counting losses so that would be maxing out the 575 and getting into bad territory.

The 1300w is only on 240v but on 120 its rated at 910w I think it was (12v x 75a). Which should still be plenty for the twin 400w model.

Realistically as i won't be using both 2S and 3S sets at the same time I'll be charging the twin 3S separately which is about 500w or so.

Glad I found this thread, was struggling to find a DC PS before I'd put money down on a good DC charger.

[snellemin]

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.