batteries to charge electric fencing

[alsxx]

I have a fence energiser that takes two 9v batteries, works fairly well but does require batteries replacing fairly often (it connects to quite a large amount of fencing).

I have a 12v leisure battery for the lights, which won't be used in the summer as don't need the lights. I'm guessing this will give a slightly bigger shock as more volts if connected up to fencing? If so this would be quite appealing to use on the fence as I have one who needs to be restricted in summer, and she's a bit of a houdini.

How would I got about connecting it to fence? With the lights its connected via both +ve and -ve terminals...but my fence energiser only connects +ve to fence, then -ve looks like its earthed, so would I need to do the same if using the batt??

 

[Mananzwa]

By using 12v it may burn out the motherboard that would have been designed for 9v. Only one way to find out.

The 9v battery will be connected to the input terminals of the energiser - I think you are looking at the output terminals where the live is to the fence and neutral to the ground. You will have to see how the battery is connected and replicate that.

I'm not saying it will work - I think there may be a puff of smoke and a bill for the replacement.

 

[CBFan]

Some energisers are designed to take both 9v and 12V bateries. For 12V you will probably need 2 extra leads (if your 9V usually slot inside the energiser) connect your battery to the energiser and then the energiser to the fence

 

[PeterNatt]

If the energiser operates from 9 Volts then you can not use a 12 v supply. It will simply burn it out.
Buy yourself a decent energiser (Eddier Paylin) and buy yourself the largest 12 volt battery (for a diesal vehicle). Then you will not have to re-charge it as often.

 

[Mananzwa]

How long do your batteries last, As you have 2 in parrallel (I assume) then you will have a minimum of 110amp hours. With a average unit drawing say 45milliamps it should last 2000 hours. (I don't know what the consumption of your particular unit is - I've simply looked at a unit that is on the market)

If it is not lasting long then look at your fence, a unit does not draw much power unless it is under challenge. You need a tester.

 

[alsxx]

Sorry don't think I was too clear in OP... I don't mean connect the 12v batt via the energiser, but could I somehow connect the 12v batt directly to the fence, or would I need some kind of converter?

My fence energiser lasts on average approx 6 - 8 weeks, and its powering approx 800m length of double stranded fence. Its a decent energiser, however houdini pony still goes through it on occaison, and at old yard farmer used a normal 12v leisure batt on his electric fence for the cows, saying it was a bigger shock. So this combined with the fact that I already have a 125amp hour 12v leisure batt that doesn't get used in the summer led me to ask my question. I have a batt charger, which makes more sense to recharge the 12v batt over the summer rather than buy new 9v batts for the energiser.

Hope that makes some sort of sense!!

 

[Mananzwa]

It will not work at all.
12v does not shock and an energiser is basically a step-up transformer converting 12v into 6000v (plus other features that allow an EF to run safely) and it is the 6000v that gives a shock. Prove it by holding both terminals on your battery-you won't be able to do that with the output leads of the energiser

Remember it is the "sting" of the shock that does the work. If you have a horse vthat is not respecting a fence, smear some treacle, syrup or molasses on a few places on the fence line. I know it sounds a bit rough but hey, it works everytime a coconut.

8 weeks is about 1300 hours so I'd suggest you are losing power on the fence somewhere. I have a feeling the farmer had a 12v unit and they are generally more powerful than a 9v unit.