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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 12-23-2010, 05:05 PM   #1
Buck Rogers
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Default High Output 12V Supply

I was thinking about getting a new charger than can charge several packs simultaneously. The problems is I'm not sure what sort of 12V supply to get for it - it seems most supplies wont handle the power levels required (200w).

Whats the best and most economical sort of supply to use?

Ideas please.


I should also add I'm in the UK so I need a supply that can convert 240v AC to 12v DC.
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Old 12-23-2010, 05:27 PM   #2
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There are some good high output power supplies but. they are expensive, here's a couple of cheaper ideas.

Many people use power supplies from computers, some are very powerful, check with a lodal computer repair shop for one that may have lost it's 5 volt output, they probably through them away,

Another idea is to use a car battery that is hooked to a small automatic charger. You may be able to put it in a box outside and run the wires inside (I have a friend that did that for a while) almost unlimited power. At least vent the hydrogen gas to the outside. don't let it build up inside a box.

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Old 12-23-2010, 07:41 PM   #3
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Thanks. I think a car battery sounds like a bit too much hassle but the computer power supply sounds like a good idea. I'll look into it.
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Old 12-23-2010, 09:02 PM   #4
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Computer power supplies work very well and by the time you used one from your old computer, they are cheap.

Look at the label for the 12 VDC maximum current in amps. Some have multiple 12 volt rails, each with their own maximum capability. To keep things simple on my LED reef aquarium lighting I use single-rail power supplies. The old-style Molex connectors (the four conductor) that are normally plugged into things like hard disks, CD-ROMS, etc. can usually handle a couple amps but don't go wild on each connector. Instead, you can solder on some Deans, EC3's, or whatever - keeping in mind the current capability of the gauge of wire.

Additionally, you will probably need to jumper two pins on the larger connector that would ordinarily get plugged into the motherboard.


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Old 12-23-2010, 09:56 PM   #5
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Default I've got a 30 amp and it's way more than I've used

I have a 20 amp and it's been way more than I need. It's a Pyramid PS21KX, here's a link on Amazon:

http://www.amazon.com/Pyramid-PS21KX.../dp/B0002JTD2A

You can save some money and get one without the ammeter, your choice.

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Old 12-23-2010, 10:27 PM   #6
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I was trying to remember the brand name that many people are using and finally remembered - Meanwell. They are reasonably priced, widely available, and can put out a lot of power.

You can find them on eBay as well as well as many other electronics suppliers.

Here is a 29 amp beast - http://cgi.ebay.com/MW-12V-DC-29A-35...item3a60e75e7f

(I have no relationships with this seller. I just searched eBay.)


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Old 12-24-2010, 02:14 AM   #7
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Default

Originally Posted by Buck Rogers View Post
I was thinking about getting a new charger than can charge several packs simultaneously. The problems is I'm not sure what sort of 12V supply to get for it - it seems most supplies wont handle the power levels required (200w).

Whats the best and most economical sort of supply to use?

Ideas please.


I should also add I'm in the UK so I need a supply that can convert 240v AC to 12v DC.
Check out www.mpja.com in the USA, per below:
http://www.mpja.com/prodinfo.asp?number=17824+PS 12 VDC, 8.5 Amps ($35 USA)

(or)

http://www.mpja.com/prodinfo.asp?number=18435+PS 12 VDC, 18 Amps ($48 USA)

These power supplies are simple to use, just plug 120 (or 240) on the AC input, and connect your unit to this devices DC output.

I've used a number of them at work before retiring. Several were energized 24 hours a day for 5 years straight. These are commercial duty power supplies. And they work very well.

Maybe if you are lucky, you might have a similar supplier in the UK??

Take a look at a real shocker!
http://search.digikey.com/scripts/Dk...me=285-1851-ND (We used these at work to, about 200 of them a month!)
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Old 12-24-2010, 02:57 AM   #8
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Heres a pretty good set of instructions: http://www.marcee.org/Articles/PCPowerSupply.htm Originally posted by CHELLIE. I found them pretty easy to follow and built myself a 400 watt 12 volt power supply in about an hour. It cost about 50 cents. Ive used it for about a year and it still works.


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