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HomeAircraftHelicopterTools and Field Equipment › Why can't I use a 10 amp Battery Charger for 12v?
10-15-2005 03:39 AM  12 years agoPost 1
hootowl

rrProfessor

Garnet Valley, Pa.

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Stupid question I think. I have a decent Sears 10amp battery charger for car batteries. Does it output ok to run as a 12v power supply to run my 12v battery charger? Am I missing something here?

Wolves don't lose sleep over the opinions of sheep

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10-15-2005 03:51 AM  12 years agoPost 2
hootowl

rrProfessor

Garnet Valley, Pa.

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What are you saying? Use a battery as a capacitor to regulate the charger output?

Wolves don't lose sleep over the opinions of sheep

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10-15-2005 03:53 AM  12 years agoPost 3
Sar

rrElite Veteran

Saugeties, NY

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Car battery charges have little to no noise/transient regulation on them.. Like Tom said, hook it to a battery then connect the charger, the battery will help filter out the 'junk' on the line

--
Jon

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10-15-2005 10:26 AM  12 years agoPost 4
Ace Dude

rrProfessor

USA

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I was under the impression the car battery chargers tend to leak A/C as well. I would never use one on any of my chargers. Plus, how convenient is it to use a big lead battery and the charger? Just get a real power supply and be done with it.

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10-15-2005 11:37 AM  12 years agoPost 5
hootowl

rrProfessor

Garnet Valley, Pa.

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I have a 20 amp linear power supply on the way. I was just curious about the charger

Wolves don't lose sleep over the opinions of sheep

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10-15-2005 03:00 PM  12 years agoPost 6
BARTGALAMBOS

rrVeteran

Huntsville, Alabama! U. S. A.

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Power Supply!
Power Supply is the answer. I thought that's what you were looking for. A charger is not a power supply.

Bart

Precious Metal Investor!!!

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10-15-2005 07:09 PM  12 years agoPost 7
Twobeers

rrKey Veteran

Toronto, Canada

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Put a volt meter on your unloaded 10amp battery charger! Its not 12volts coming out of that sucker. Do you want to risk ruining your charger. Enough said.

I lost my infamous tag line.

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10-15-2005 11:50 PM  12 years agoPost 8
Sipper

rrApprentice

Poole, Dorset, UK

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You may also find that the DC output is quite wavy, due to the method of converting from AC to DC, as compared to a clean flat DC supply. The DC - AC conversion is generally done with a bridge rectifier which does not really give out a true DC voltage, and is probably not smoothed out either. If the charger has no means of smoothing out the DC voltage you may damage any equipment you are running off it.

Scrounge an old PC power supply and make yourself up a 12v power supply for a couple of bucks.

HTH

Sipper

My memory's not as sharp as it used to be. Also, my memory's not as sharp as it used to be.

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10-15-2005 11:55 PM  12 years agoPost 9
hootowl

rrProfessor

Garnet Valley, Pa.

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Thanks for all the replys.

Earlier I stated I have a 20 amp linear supply ordered but I was just curious why you couldn't use a charger.

PC power supplies don't put out enough for my Graupner... it requires 15 amps power supply and 30 ah battery.

There was also the question of whether I went with a switching power supply or a linear type. I discovered the linear type is the cleanest.

Wolves don't lose sleep over the opinions of sheep

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10-16-2005 02:12 AM  12 years agoPost 10
CT.Chopper

rrVeteran

Meriden, CT

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I just bought a Ripmax pro-peak 13.8v 20 amp
power supply.

it works awesome, im charging a 20 cell 4000 mah battery
right now, and the output is still at 13.7v

it cost me 50 bucks brand new

probably the best 50 i've spent on this hobby...

Rob Landry.

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10-24-2005 05:40 AM  12 years agoPost 11
stott1

rrNovice

Roy, Utah

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Cheap Power Supply
Just go down to your local computer store and purchase a computer power supply. Better yet, tear one out of an old computer and use it. The yellow wires are the 12v supply and the black ones are the ground. You can discard the rest. The one that I am using is rated at 8.0A on the yellow 12v wires. It has served me well with all my charging needs.

Now that I have read all the posts,I feel like a dummy. lol! Anyhow, I am relatively certain that with the newer computers the power supply needs have increased it would probably be worth the effort to take a look.

Just a thought.

Don

There is always enough time and money to do it right the second time!

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12-08-2005 01:56 AM  12 years agoPost 12
NitroPolymer

rrVeteran

Southeast Florida

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Half wave recitification is employed on almost all 12 battery chargers, and this method of converting AC to DC blocks only the inverted porions of the sine wave, which results in a wild-frequency pulsing (noise) which will have a significant adverse affect on the hobby chargers input circuitry. A 12V power supply on the other hand uses full-wave conversion, which uses a series of diods to align the polarities of the positive and negative portions of the sine wave, and has enough capacitance to smooth the transients. I hope this isn't too technical, but I think it is important to understand the differences between the two devices, because even though both have 12V of output, there are significant differences.

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12-08-2005 05:03 AM  12 years agoPost 13
darkfa8

rrElite Veteran

Brick, NJ - USA

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I'll be doing the el cheapo computer AT or ATX style power supply mod to power my Sirius Pro in the house instead of hauling up my 12vdc 35amp sealed lead acids from the garage to my room :P

- Dan Goldstein
Team Revolectrix

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