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wallablack

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Joined: 10/08/2011
Location: Australia
Posts: 164

Posted: 10:42am 10 Nov 2013

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Hi Guys,

I wish to build a 24V 30 AMP+ battery charger or power supply. I want it to go to 35V but it must be 30+ amps. I want to use it to boost up my 24V 400AH battery bank on low sun and low wind days.

Does anyone know of any good designs....cheaper the better and if I can build it from recycled parts I would be more than happy...

Foolproof systems do not take into account the ingenuity of fools.

dwyer
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Joined: 19/09/2005
Location: Australia
Posts: 574

Posted: 11:01am 10 Nov 2013

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hi
Best way do Google searching look up for second hand forklift batteries changer that will product high amps is easy way to find

Dwyer the bushman

MOBI
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Joined: 02/12/2012
Location: Australia
Posts: 819

Posted: 12:11pm 10 Nov 2013

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I have a couple of old gasless mig welders (courtesy of downwind) that produce pretty well near the current you are looking at. I had to wind a couple of extra turns on the core to get the right voltage.

The unit doesn't have any regulation but the voltage selection switches give a fair range of control. It wouldn't take much to fit a few voltage taps. I used it when I had the generator going for welding. These days I generally have enough charge current now that I have hooked up a grid tie inverter to my RAPS system. The new mono panels really work well.

I used the diode assembly that came with the mig welder as they seem to be able to handle surges and a good deal of heat. A small computer fan as a cooler wouldn't go astray. The potted bridge rectifiers that hobbyists usually use kept over heating and blowing up.

David M.

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 04:03pm 10 Nov 2013

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Did you try a forum search.

Glenn done this one a little while ago.

http://www.thebackshed.com/forum/forum_posts.asp?TID=5262&PN =3&TPN=1

Pete.Edited by Downwind 2013-11-12

Sometimes it just works

wallablack

Senior Member

Joined: 10/08/2011
Location: Australia
Posts: 164

Posted: 11:00am 11 Nov 2013

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Very interesting read Pete.
I always search before asking...maybe not thoroughly enough lol.

Edited by wallablack 2013-11-12

Foolproof systems do not take into account the ingenuity of fools.

Madness

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Joined: 08/10/2011
Location: Australia
Posts: 2498

Posted: 09:33pm 11 Nov 2013

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You could just use the welding transformer idea as a bulk charger and have it turn off at a pre-set voltage. Would be very easy to do with an Arduino, that way you could also switch to a different windings for absorbing charge.

There are only 10 types of people in the world: those who understand binary, and those who don't.

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