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Electric fence circuit for perimeter defense

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radhoo

Thu Sept 08 2011, 02:21PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

A great tool to have in the wild, here is a high voltage pulse generator that will produce configurable pulses of up to 20KV.
Also known as "electric pastor", this device will keep big animals away.

Construction details here:

A test video:

HazzWold 1993

Fri Sept 09 2011, 02:41AM

Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280

That will tickle, or at best aggravate the bear if anything.

Turkey9

Fri Sept 09 2011, 03:42AM

Registered Member #1451 Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661

A great thing for bear defense is hanging your dirty socks around the camp. Bears don't come into your camp looking to attack; they come looking for food. If they smell a human, they'll keep clear.

As far as the pulse generator goes, good job! Is it going to be going all night? I assume that the LED is to check that it is still running. Are you going to have a solar panel to recharge the batteries?

testtest

Fri Sept 09 2011, 09:55PM

Registered Member #3271 Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159

Been around bears.
That will just p***-off the bear if he/she puts the nose forward. Human scent is the way to go. Just mark your territory around each fence post (dont forget to turn off your gizmo however....)

GrantX

Sat Sept 10 2011, 02:53AM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

Heres a small black bear copping a few kVA and a 5 meter fall and surviving.

Your gonna need a lot more juice. Just hook up an NST at the very least :D

radhoo

Sat Sept 10 2011, 08:38AM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Turkey9 wrote ...

As far as the pulse generator goes, good job! Is it going to be going all night? I assume that the LED is to check that it is still running. Are you going to have a solar panel to recharge the batteries?

All night long. Average power consumption 50mA for a 12V pack of batteries . If this thing runs only at night, it will last enough for the whole trip. For day encounters pepper spray.

Here's a document discussing the use of electric fences to protect from bears:

wrote ...
Additionally, current research recommends approximately 5,000-
6,000 volts needed to effectively shock a black bear. Two basic energy sources for
chargers are batteries (12-volt automotive type), and household current (110 volt);
however solar panes can be added to battery chargers.

So please don't worry about how effective high voltage can be. Pain can be a very good argument to make a bear go away, especially when it has no special interest to the protected perimeter.

Here's another commercial unit doing the same thing:

You can save a few bucks and build one yourselves.

HazzWold 1993 wrote ...

That will tickle, or at best aggravate the bear if anything.

Actually it will create intense pain. Not something any living animal wants to feel. Read the docs above to learn more.

XravenorX wrote ...

Heres a small black bear copping a few kVA and a 5 meter fall and surviving.
Your gonna need a lot more juice. Just hook up an NST at the very least :D

I don't want to kill the bear.

GrantX

Sat Sept 10 2011, 09:33AM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

radhoo wrote ...

I don't want to kill the bear.

But then what will you eat while camping? :D

radhoo

Sun Sept 11 2011, 06:46PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

XravenorX wrote ...

But then what will you eat while camping? :D

Good one :)

jnbrex

Mon Sept 12 2011, 09:59PM

Registered Member #3950 Joined: Wed Jun 15 2011, 12:45AM
Location:
Posts: 51

The reason this won't hurt the bear at all is because the current is so low. Too get enough current to actually hurt the bear, you will need a much beefier power supply. With the amount of current that thing appears to be generating, I doubt the bear would even acknowledge the shock.

radhoo

Tue Sept 13 2011, 09:20PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Actually it would . Please read the links posted above. This type of fence is used for domestic animals, including Horses, Sheep, etc.

The bear doesn't have the greatest fur, so not much insulation for them, unlike sheep.

Do you have any experience with electric fences? Or perhaps with bears?

Why most of you only think that a Nazy Lethal fence would work for bears?
HV penetrates skin. Penetrated skin means affected nerves. Affected nerves equals pain. No need to kill the bear.

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