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Old May 17, 2008, 09:00 AM
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United States, NY, Fairport
Joined Jun 2000
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good power supply

Just a heads up to those needing a power supply for chargers. I've been using this power supply for a couple of months now and it works very well with my CellPro's and Triton.
http://cgi.ebay.com/12-0-VOLT-15-AMP...QQcmdZViewItem

He's an veteran HAM radio guy who knows electronics very well and provides a modified new computer supply. Note his description and the picture, its a nice clean package. He also has a 1 year warranty.
Hope this helps,
Dave
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Old May 17, 2008, 09:47 AM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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Reasonable I guess but delived price is nearly twice what I paid for 12 volt /30 amp. IBM 235 hot swapable server power supplies.


Charles
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Old May 17, 2008, 12:57 PM
Proud to eat Kraut ;-)
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Germany
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I recently aquired this baby:
http://cgi.ebay.com/12V-DC-29A-350W-...713.m153.l1262

It survived a 30A, 30min burn-in test powering my brother's van's headlights.
I made a new frontplate with some connectors, a switch and a bright power indication led.
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Old May 17, 2008, 01:30 PM
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Western KY
Joined Sep 2003
1,563 Posts
Quote:
Originally Posted by everydayflyer
<snip>.....is nearly twice what I paid for 12 volt /30 amp. IBM 235 hot swapable server power supplies.

Charles
When using converted PC powersupplies, the server PSUs are often the best buys, even if priced higher. Many of the supplies are proprietary and manufactured under fairly tight controls set up by the vendor. Servers are expected to run 24/7, are many times used in mission critical situations where downtime is unacceptable and place demands on the PSU not found in the desktop PC. The big players in the server market do not want a reputation of selling substandard equipment so the products are usually correctly speced and production is of a higher quality.


Hot swap server supplies often have load sharing features that allow them to be connected in parallel to distribute the load and provide increased power. Everydayflyer has previously posted some data relative to load sharing.

andrew
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Old May 17, 2008, 03:46 PM
T2H
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France
Joined Aug 2007
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I have a Mass 25A power supply that is working perfectly.
http://www.maas-elektronik.de/index....rr=R535&hcurr=
In my opinion we can find cheaper PS that do the job for our usage. Maas PS are suitable for radio amateur use, we do not need so much accuracy for powering our chargers. Anyway you can consider these power supplies if you find it at good price because it works flawlessly. There are 40A, 60A and 120A available too.
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Old May 17, 2008, 08:02 PM
The Great Santini
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Madison, NJ 07940
Joined Dec 2004
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I bought one of these recently for (20 amp) $44 on sale. Very nice. I run three chargers off of it.
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Old May 17, 2008, 08:13 PM
Southern Pride
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Haralson County GA. USA
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http://www.rcgroups.com/forums/showp...5&postcount=31

About $25 delivered to your door from E Bay. Takes 5 min. to solder output leads on and install a jumper clip. Supplies 30 plus amps. I have ran two in parallel up tp 45 amps. and stopped there as I ran out of loads. I have purchased 4 at a time for less than $20 each delivered.
If there is a better buy I am not aware of it.

Charles
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Old May 17, 2008, 08:27 PM
willfly4$
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United States, MS, Bay St Louis
Joined Apr 2005
250 Posts
man you guys have some serious power supplies! ive been converting and selling mine here on the grous, but mine are small 10amp ps. they work fine for my use but i have been looking for some bigger supplies, i just cant seem to find a good deal on ebay YET

thanks for the info guys!
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Old May 18, 2008, 12:30 PM
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San Jose Ca / RSA flyer
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U can get more compact cheaper switching power supplies @ local electronic surplus~ $20 bucks and no shipping
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Old May 18, 2008, 12:43 PM
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Mercer Co. PA
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We give a lot of kudos here to things, simply because they work. Very important, is the regulation of these supplies, and you would need to check that on a scope, as I wouldn't trust what they print. Lipo chargers may not have much filtration, if any, and require a clean source. It's possible to burn up the filter caps (if they exist) or the device itself, with a cheap supply. Basically saying these are devices that need to be reviewed on tested specs.

Bill
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Old May 18, 2008, 01:55 PM
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Quote:
Originally Posted by everydayflyer
http://www.rcgroups.com/forums/showp...5&postcount=31

About $25 delivered to your door from E Bay. Takes 5 min. to solder output leads on and install a jumper clip. Supplies 30 plus amps. I have ran two in parallel up tp 45 amps. and stopped there as I ran out of loads. I have purchased 4 at a time for less than $20 each delivered.
If there is a better buy I am not aware of it.

Charles
TOO MUCH WORK, man

on SWITCHERs, all U gotta do is attach an ac power cord and trim the POT
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Old May 18, 2008, 02:11 PM
willfly4$
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United States, MS, Bay St Louis
Joined Apr 2005
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Quote:
Originally Posted by EDF30
We give a lot of kudos here to things, simply because they work. Very important, is the regulation of these supplies, and you would need to check that on a scope, as I wouldn't trust what they print. Lipo chargers may not have much filtration, if any, and require a clean source. It's possible to burn up the filter caps (if they exist) or the device itself, with a cheap supply. Basically saying these are devices that need to be reviewed on tested specs.

Bill

The specs that come with the triton jr i have state that input voltage can be anywhere from 10v to 15v, so for me, almost any of the small computer power supplies will work even if i push them to a low voltage. i think the cellpro4s goes that low too.

in response to EDF30, i guess people arent worried about using these power supplies we are talking about as for some time now they have been "field tested" and i personally havent heard of anyone frying or having problems with their batts because of bad wave filtering. certainly though, if you tested these things with an oscope that would be one less thing to worry about
rock on bill
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Old May 19, 2008, 06:14 AM
T2H
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France
Joined Aug 2007
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I have a second lighter and smaller power supply for field usage (but not only). It is a Much More power master miini, 8A PS which weight 375g: http://www.muchmoreusa.com/power-supplies/index.html
Much-more iswell known in the world of electric car racing

It is suitable for any charger <=100W but in comparaison with the maas 25A we can ask whhere is the DC regulation :
The Maas ouputs 100mA or 25A at 13.8V (or whatever you want providing it is <15V) but the much-more's voltage drop is significant:
-I set 13.8V with no load
-13.5V at 8A, it is still good to power a 100W charger, my charger need 5A at this voltage for charging my 5s at 3A.
-12.6V t 10A (overload)
-the small fan is noisy, very present (high frequencies) and become louder with the load.

For a radio enthusiast or scientific usage, this small power supply is junk like maybe all PS from RC vendor but it is suitable for RC chargers which can cope with voltage drop about 5%. Finally I am very pleased with this small PS in my small field case. With it I charge all my packs including 5s 3700.
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Last edited by T2H; May 19, 2008 at 06:23 AM.
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Old May 19, 2008, 03:06 PM
ProgressiveRC
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Seattle, WA
Joined Dec 2006
1,996 Posts
Quote:
Originally Posted by Julez
I recently aquired this baby:
http://cgi.ebay.com/12V-DC-29A-350W-...713.m153.l1262

It survived a 30A, 30min burn-in test powering my brother's van's headlights.
I made a new frontplate with some connectors, a switch and a bright power indication led.
Nice find right there Julez, although a little output voltage range would be nice to have.
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Old May 19, 2008, 03:26 PM
Proud to eat Kraut ;-)
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Germany
Joined Dec 2003
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No Problem, it is available.
http://www.meanwell.com/search/s-350/default.htm
Here a better eBay link:
http://search.stores.ebay.de/Sure-El...644246QQsofpZ0
There is a little poti at one side; I adjusted the voltage to 13.8V, like on my other power supply:

http://desc.shop.ebay.de/items/_W0QQ...sacat=0&_rdc=1

The SmartTips use an internal voltage divider to adjust the voltage here. I soldered a little voltage divider from SMD resistors; it is so small that it fits between the contacts of a Deans or MPX plug.
Now, it can do 13.8V @ 6.5A, and it is the perfect mobile power supply for me. It looks neat, is very slim, and has a blue power LED.
What more can you ask for
If soldering around extensively in or at a power supply is not your flavour, you can take a slightly bigger and slightly less beautiful ordinary mobile power supply:
http://www.hobbycity.com/hobbycity/s...A_Power_Supply

I have attached some pictures of my contraptions.
Cheers,

Julez
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Last edited by Julez; Mar 23, 2009 at 02:47 PM.
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