Electric bear fence


  #1  
Old 07-12-22, 09:38 AM
WRDIY's Avatar
Member
Thread Starter
Join Date: Jul 2012
Posts: 1,096
Received 38 Likes on 36 Posts
Question Electric bear fence

Can someone help me understand how a bear fence works in terms of delivering the shock?

I have been watching Youtube videos and have been researching on Amazon.

https://www.amazon.com/Parmak-DF-SP-.../dp/B000BWZB74

It comes with a negative(ground) and positive terminal. I guess some of my outstanding questions are:

In some of the videos, it said to make sure the positive fence line not to touch the weeds or soil. Why? If it does, what will happen? Does it catch the weed on fire? Does it not shock if someone touches it since the circuit has been completed already?

Why is the black terminal the negative connected to the ground rod? Why is this needed?

https://youtu.be/lqIRMavnahE?t=492

Is it better to have alternate negative and positive like here:

https://youtu.be/lqIRMavnahE?t=202

How can 6 volt have enough juice to be converted into 7K volts to shock a bear?

https://youtu.be/lqIRMavnahE?t=504

Will this work for zombies?

Thanks
 
  #2  
Old 07-12-22, 10:33 AM
P
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 28,341
Received 1,628 Likes on 1,461 Posts
With an electric fence you often hook the ground up to a ground rod driven into the ground (did I say ground enough?). Literally making the ground a conductor in the circuit. Then you put high voltage to the wires. The voltage is high enough that things like fur, plants or shoes are not enough to protect against the shock so the animal gets zapped. It's very high voltage but low amperage so it can make a nice spark and it's far from comfortable to touch but it's pretty safe.

In very dry soils the ground cannot conduct well enough. In that case you run both positive and negative wires and the animal needs to touch two of them to complete the circuit and get shocked.

Weeds and grass are conductive enough that if they touch the fence the weeds get shocked. Pretty quickly the high voltage kills and dries out (burns) that part of the plant. If it's dry enough the weed may smoke but I've never seen one actually catch fire. But if it's windy you can sometimes see the spark and hear the pop when a weed just brushes against the fence.

My neighbor is a buffalo farmer. You do NOT want to touch his electric fence. His fence will shake you to the core.
 
The following users liked this post:
  #3  
Old 07-12-22, 11:04 AM
WRDIY's Avatar
Member
Thread Starter
Join Date: Jul 2012
Posts: 1,096
Received 38 Likes on 36 Posts
Hi Dane, would you be able to share with me how can a 6 volt battery have enough juice to be converted into 7K volts to shock a bear?
 
  #4  
Old 07-12-22, 11:52 AM
G
Member
Join Date: Sep 2009
Location: USA
Posts: 189
Received 4 Likes on 4 Posts
6V is converted to AC and then to high voltage with transformer, like a tesla coil. It's all about conservation of wattage. So 6V 10A can be converted to 60V 1A, or 600V 0.1A, or 6000V 0.01A, etc. (assuming 100% conversion efficiency).
 
The following users liked this post:
  #5  
Old 07-12-22, 12:47 PM
J
Member
Join Date: Sep 2002
Location: welland ontario
Posts: 8,342
Received 462 Likes on 382 Posts
would you be able to share with me how can a 6 volt battery have enough juice to be converted into 7K volts to shock a bear?
Think of the spark plug on your lawn mower. It's the same circuit idea.
 
The following users liked this post:
  #6  
Old 07-12-22, 02:01 PM
C
Member
Join Date: Mar 2007
Posts: 2,349
Received 239 Likes on 197 Posts
My fences run off a 12v battery. The very short duration pulseless than a millisecond, measures at 9000V. After a few weeks the deer no longer go near the fence so I shut it off. They still stay away.
 
  #7  
Old 07-12-22, 02:16 PM
WRDIY's Avatar
Member
Thread Starter
Join Date: Jul 2012
Posts: 1,096
Received 38 Likes on 36 Posts
CWBuff, what brand do you have for the energizer?
 
  #8  
Old 07-12-22, 05:55 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 15,030
Received 629 Likes on 538 Posts
You can get everything you need to set up an electric fence from a farm store. (Tractor Supply, Fleet Farm, Farm Fleet, Blain's Farm Fleet, Etc)
 
The following users liked this post:
  #9  
Old 07-13-22, 07:01 AM
W
Member
Join Date: Feb 2006
Location: USA
Posts: 6,919
Received 56 Likes on 49 Posts
Weeds touching an electric fence partially grounds the fence and weakens the shock effect.
 
The following 2 users liked this post by Wirepuller38:
  #10  
Old 07-13-22, 09:58 AM
P
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 28,341
Received 1,628 Likes on 1,461 Posts
Another good place to look for fencing supplies is Kencove. They even have an electric netting fence. I've never tried it but I'm really curious.
 
  #11  
Old 07-13-22, 10:44 AM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: United States
Posts: 11,173
Received 167 Likes on 150 Posts
How can 6 volt have enough juice to be converted into 7K volts to shock a bear?
Just curious, are you trying to keep the bears in or keep the bears out? Black bears?
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: