The main fence chargers I use are Parmak 12 DC fencers......which are 3.0 joules and rated for 30 miles of fence.
I also have this one.......which is 0.6 joules.....and rated for 5 to 15 miles of fence....
https://gallagherelectricfencing.com/products/b60-battery-powered-energizer-15-miles-60-acres.
Fence chargers seem to be a loosely rated standard......in other words.....one outfit's 1 joule may not be the same as another. And there seems to be as many explanations of what the joule fence rating means as there are companies that make them.
But for our purposes, if you find one rated for at least 1 joule or 10 miles, and in your setup, it tests out to 7,000 volts or more, you should be OK. That is as per instructions that came with both brands of fence chargers.
My Parmak fencers, on a small run and fresh battery will test out to 13,600 volts. The Gallagher must have a different type of internal regulator, as it only tests out to 7,400 volts no matter the fence. But videos of coons touching the Gallagher fence suggests it is just as effective. They don't like it. That is assuming you get a clean shot at em, like on a paw or their nose. If there is an advantage to a super hot fencer, if the voltage gets cranked up high enough, you risk induction........which means the spark is ready to jump and over a wide area. A low voltage unit will give off a small, mild spark when shorted out. With a hot fencer on the verge of induction, a large loud spark. A hot fencer may punch through fur.....like when a varmint is crawling under a fence and the wire is only rubbing on their back. With a hot fence, if the wire gets close enough....it will jump and get em.
As near as I can tell, there is no downside to a hot fencer...in the range of 1 to 3 joules......10 to 30 mile fencers.....other than the marginally higher cost.
I also have this one.......which is 0.6 joules.....and rated for 5 to 15 miles of fence....
https://gallagherelectricfencing.com/products/b60-battery-powered-energizer-15-miles-60-acres.
Fence chargers seem to be a loosely rated standard......in other words.....one outfit's 1 joule may not be the same as another. And there seems to be as many explanations of what the joule fence rating means as there are companies that make them.
But for our purposes, if you find one rated for at least 1 joule or 10 miles, and in your setup, it tests out to 7,000 volts or more, you should be OK. That is as per instructions that came with both brands of fence chargers.
My Parmak fencers, on a small run and fresh battery will test out to 13,600 volts. The Gallagher must have a different type of internal regulator, as it only tests out to 7,400 volts no matter the fence. But videos of coons touching the Gallagher fence suggests it is just as effective. They don't like it. That is assuming you get a clean shot at em, like on a paw or their nose. If there is an advantage to a super hot fencer, if the voltage gets cranked up high enough, you risk induction........which means the spark is ready to jump and over a wide area. A low voltage unit will give off a small, mild spark when shorted out. With a hot fencer on the verge of induction, a large loud spark. A hot fencer may punch through fur.....like when a varmint is crawling under a fence and the wire is only rubbing on their back. With a hot fence, if the wire gets close enough....it will jump and get em.
As near as I can tell, there is no downside to a hot fencer...in the range of 1 to 3 joules......10 to 30 mile fencers.....other than the marginally higher cost.