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Tool Talk Discussion Forum

Using a 6 volt fence charger with a 12 volt batter

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Bob G

06-10-2004 09:58:27

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I have a couple of 6 volt fence chargers and no batteries, but I have some deep cylce 12 volt ones.
Someone said you can get a resister to put in the + side of the wire to drop the voltage down to 6 at the charger. Does anyone know what part(s) I would need and where I could get them.

Thanks,
Bob

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Another option

06-11-2004 08:00:55

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

Get one of these and wire it into the fencer. The you'll have a 12v fencer.

12 to 6 volt converter

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Larry in Tn

06-11-2004 06:42:09

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

Bob
I have to agree with the get a 6volt battery advice. Check around at a few yard/garage sales and try to find a couple of the little 6volt rechargeable batteries used in the "power wheels" kids riding toys. Two of them in parallel(plus to plus and neg. to neg.) should be good for 10 amps. @ 6volts. You can parallel more of them if you find more. Voltage will remain the same but current will capacity will increase.
Dropping resistors work but as a last resort. They just dissipate the voltage by converting it to heat.
If you are pretty handy with electronic gadgets you can get a zener diode which is a solid state device that acts as a voltage regulator. They can be had in different voltage values and do a good job of holding voltage to a set level. Biggest draw back is the fact that price increases with wattage/current handling ability. You will need to figure the wattage size of the zener based on the current demand multiplied by the voltage.
There are some other ways to improve on the zener concept but you may not want to go that way.
I'm the type that will go to extremes to see if something is possible. Not everyone subscribes to that line of thought.
Larry

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RayP(MI)

06-10-2004 18:02:09

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

The amount of resistance necessary to drop the 12v to 6v will vary with the load, ie. how much the fencer actually presents. If the fencer is a pulse type unit, as most are, the load will vary, so you really can't come up with a resistor which will do the job. Your best bet is a 6v battery, or get a 12 volt fencer.

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Bus Driver

06-10-2004 17:56:39

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

In theory, a dropping resistor will work OK. But the value of the resistor must be matched to the amperage draw of the device. Simple Ohms Law calculation. If the charger has intermittent draw- click, click- which I suspect it has, the voltage applied will be the full 12 volts anytime there is no current draw- the voltage drop occurs only when current flows. The 12 volt jolt at each click may be harmful to the charger.

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T_Bone

06-10-2004 13:22:11

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

Hi Bob,

Buy two cheap 6v latteren battery's and use the 12v battery to keep the 6v battery's charged.

Wire the positive of 6v Bat#1 to the negative of 6v Bat#2, this makes 12v between the negative of #1 and the positive of #2

Wire the 12v Bat negative to the negative #1
Wire the 12v Bat positive to the positive of #2 6v to the fence charger is taken from negative and positive of 6v battery #2

*************************6v to fence charger
****************************l----- --l ****************************/---^---/
****************6v Bat******/----- -/
********l_-#1--+l----- ----- ->-l_--#2-+ ********^_____ _____ _____ _____^
********l_____ _____ _____ _____ l
********l_<-----12v Bat----- ----- ->+l Sorry my scanner took a dump.

Thats about the only way you'll get enough "cheap" amps to run the fence charger other than buy a 6v deep cycle battery.

T_Bone

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MAC,IL

06-10-2004 12:55:08

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

I dont think I would go the bother trying to get 6v out of 12v. Myself I would just get a battery.

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Greg

06-10-2004 11:47:59

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

I think you could use a ballast resister off of a mid to late 1960�s Chrysler product. It was used to drop the voltage down to 12 volts for the ignition systems.

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paul

06-10-2004 12:18:53

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Re: Re: Using a 6 volt fence charger with a 12 vol in reply to Greg, 06-10-2004 11:47:59

I really have no idea, but very many older tractors converted to 12v use that type of ballast resistor to continue to use the 6v ignition system. You might want to ask at a good NAPA or ag supply place.

--->Paul

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ScottP

06-10-2004 11:40:57

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

Bob
You would be better off getting a 6 volt battery to run your fence off of. If you use a resister to drop down the voltage the battery wont last as long as a 6 volt battery would. Also those resisters get very hot dropping the voltage and could start a fire.

Scott

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Ron

06-10-2004 10:41:04

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Re: Using a 6 volt fence charger with a 12 volt ba in reply to Bob G, 06-10-2004 09:58:27

Radio Shack.

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Bob G

06-10-2004 11:19:16

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Re: Re: Using a 6 volt fence charger with a 12 vol in reply to Ron, 06-10-2004 10:41:04

I went to Radio Shack and asked them how I could do it and they didn't know. Do you know what parts are needed.

Bob

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