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'[EE]: 15 amp power supply.'
2001\05\16@022256 by Peter Grey

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I need to drive some equipment that requires 12 volts (car battery) at 14
amps. Initially it will require 10 amps while heating and then
intermittently to maintain temperature on the heaters. I want to have
something external to the equipment and preferably UL approved. I would
prefer if it was available in the USA but this is not essential. Of course
cost is, as always, a major consideration.


Any ideas.

TIA,

Peter

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2001\05\16@023104 by Arpit

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Try a 400 wat computer psu

On Wed, 16 May 2001 14:13:59 +0800, you wrote:

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2001\05\16@024629 by Chris Carr

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Arpit replied


>Try a 400 wat computer psu

Assuming you mean a PSU for a PC, I fail to see how this will provide a
solution. Please provide more details.

Regards

Chris Carr

>>I need to drive some equipment that requires 12 volts (car battery) at 14
>>amps. Initially it will require 10 amps while heating and then
>>intermittently to maintain temperature on the heaters. I want to have
>>something external to the equipment and preferably UL approved. I would
>>prefer if it was available in the USA but this is not essential. Of course
>>cost is, as always, a major consideration.
>>

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2001\05\16@030839 by Vasile Surducan

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45Ah acid battery, car tools from car battery.

On Wed, 16 May 2001, Peter Grey wrote:

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2001\05\16@032404 by Bill Westfield

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> I need to drive some equipment that requires 12 volts (car battery) at 14
> amps. Initially it will require 10 amps while heating and then
> intermittently to maintain temperature on the heaters. I want to have
> something external to the equipment and preferably UL approved.

"Consumer" high current power supplies at "car" voltage (12 to 13.8V) are
pretty commonly available - check "ham radio" suppliers.  For instance:

http://www.robotbuilders.net/B9/retail_suppliers/astron/astron.html

BillW

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2001\05\16@090619 by Olin Lathrop

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> I need to drive some equipment that requires 12 volts (car battery) at 14
> amps. Initially it will require 10 amps while heating and then
> intermittently to maintain temperature on the heaters. I want to have
> something external to the equipment and preferably UL approved. I would
> prefer if it was available in the USA but this is not essential. Of course
> cost is, as always, a major consideration.

I don't undertand the problem, just connect it to the battery.  All you need
is some 12 gauge wire.  Car batteries have no problem with 14A, although you
don't want to do this for many hours without the engine running to charge
the battery.

If you want to run your equipment from 110V AC, you can get "car battery
chargers" at Radio Shack and other places.  I have one here that plugs into
a normal AC outlet and produces 14.3V at 10A.  It has a cigarette lighter
socket and binding posts for outputs.  I imagine there are 15A models.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, @spam@olinKILLspamspamembedinc.com, http://www.embedinc.com

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2001\05\16@125010 by Chris Carr

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Peter Grey wrote

> I need to drive some equipment that requires 12 volts (car battery) at 14
> amps. Initially it will require 10 amps while heating and then
> intermittently to maintain temperature on the heaters. I want to have
> something external to the equipment and preferably UL approved. I would
> prefer if it was available in the USA but this is not essential. Of course
> cost is, as always, a major consideration.
>

A 12 volt car battery with a 5 to 7 Amp charger. (Charger sized to top up
battery when not supplying load)

Or look for Amateur Radio Suppliers. They stock 13.8 volt power supplies
for powering Amateur Radio Equipment.

Regards
Chris Carr

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2001\05\16@195027 by Peter Grey

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At 07:21 AM 5/16/2001 -0400, you wrote:

I really did not explain this too well. I need to have something powered
from the mains voltage - 110VAC in the USA. I understand that now days most
power supplies will operate from about 100 to 260 volts AC. I am currently
using a car battery and a customer has said they want to operate it
indoors. This makes it awkward dragging a battery around.

Thanks,

Peter
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2001\05\16@204345 by David Huisman

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Peter,

Try http://www.logitekinc.com/oldindex.htm

They have a range of Switchmode power supplies that go up to 300W.

Also can search web for "switch mode power supplies", there are heaps of
them in the US that would be 110VAC powered, 12V at over 170VA that you
require.

Regards

David Huisman

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2001\05\16@211006 by Peter Grey

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At 10:27 AM 5/17/2001 +1000, you wrote:

Thanks to all for the suggestions on the power supply. I have found one at
a reasonable cost (Astron Corporation) and am getting one over to have a
look.

Peter
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