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  1. #21
    Join Date
    Dec 2002
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    Denver, Colorado
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    5,113

    Default Re: Had to get my bear license

    Yes, but with an all in one unit, typically, the solar panel is small, the battery is small, and the charger puts out a fraction of a joule. They work great for horses and animals which are more sensitive. Some times you need a bit more power!

    My chicken fence uses a 30 watt panel, a 75 amp hour battery, and a 1 joule charger. It will go a month without sunshine, a bit overdone, but what can I say.
    Solomon Parker, Parker Farms, ParkerFarms.biz
    11 Years Treatment-Free, ~25 Colony Baseline

  2. #22
    Join Date
    Mar 2011
    Location
    Utica, NY
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    9,799

    Default Re: Had to get my bear license

    I wonder how they do it in the medical field. It seems to me the defib packs used for starting your heart went up to 300 joules off a little 12 volt battery initially designed for lap tops. That much power can stop your heart as well as start it so I don't think a bear would go for a second shock.
    Brian Cardinal
    Zone 5a, Practicing non-intervention beekeeping

  3. #23
    Join Date
    Feb 2009
    Location
    Colorado Springs, CO
    Posts
    359

    Default Re: Had to get my bear license

    The solar powered fence chargers do have a battery. The less expensive ones (ie. Harbor Freight) do have far less "kick" and of course are China stuff. The more expensive ones (ie. Kencove) are usually made for longer fence runs and have a greater "kick". The batteries in these are larger and will run effectively for 20-30 days with zero sunlight. Another factor is the age of the battery, ie. its health.

    Steve

  4. #24
    Join Date
    Dec 2002
    Location
    Denver, Colorado
    Posts
    5,113

    Default Re: Had to get my bear license

    Not to get off topic, but from what I understand, defibrilators do not start hearts, just stop them. The idea is to stop the fibrilation so the heart will start rhythmic beating on its own. Bad idea for children and such.

    Steve, I got both my battery powered chargers from Kencove. They are made in New Zealand and work excellently.
    Solomon Parker, Parker Farms, ParkerFarms.biz
    11 Years Treatment-Free, ~25 Colony Baseline

  5. #25
    Join Date
    May 2012
    Location
    Roanoke, VA
    Posts
    1,503

    Default Re: Had to get my bear license

    Quote Originally Posted by Bwar77 View Post
    Attachment 3444
    I bear hunt everyyear with a group just so I dont have to go to work
    I need your boss to talk to my boss. If going hunting gets you out of work I need to get a better boss!

    I've heard peanut butter on the wires work. You need to get them to lick the wire. Then they will stay away. Unfortunately, once they get in you can't keep them out, at least that is what I've been told. I hope you have better luck going forward.

  6. #26

    Default Re: Had to get my bear license

    Quote Originally Posted by Acebird View Post
    defib packs used for starting your heart went up to 300 joules off a little 12 volt battery
    For a millisecond or so. Duration is the other element. A decade ago, when I meddled with the things they were pretty smart. They knew when to correct for atrial fibrillation or ventricular fib or a full restart for asystole.
    A good fence charger may need to supply that same energy for an extended period and/or repeatedly to thwart a bear.
    Dan www.boogerhillbee.com
    Experience is a hard teacher because she gives the test first, the lesson afterwards

  7. #27
    Join Date
    Mar 2011
    Location
    Utica, NY
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    9,799

    Default Re: Had to get my bear license

    Can anyone explain how a fence charger works? Is there a circuit that charges up a capacitor to a higher voltage and then discharges when something makes contact? How is the step up done without draining the battery in a short time?
    Brian Cardinal
    Zone 5a, Practicing non-intervention beekeeping

  8. #28
    Join Date
    May 2012
    Location
    Roanoke, VA
    Posts
    1,503

    Default Re: Had to get my bear license

    Never set one up, but my guess is that the solar charger trickle charges the battery. Not sure how long the battery would last without that.

  9. #29
    Join Date
    Dec 2002
    Location
    Denver, Colorado
    Posts
    5,113

    Default Re: Had to get my bear license

    Brian, the pulse is discharged every time the charger *clicks*. There is not much energy expended, a joule is only equal to one watt for one second. Add to that the intermittance and power consumption is pretty low. Including losses a one joule charger probably uses one watt continuously. The voltage is high, 5000 or so, which gives you the jolt, to cause pain but not much else. A 75 amp hour battery will contain almost a thousand watt hours, meaning the charger can run about a thousand hours before the battery is dead.

    I know you know the electrical stuff, but others might not.
    Solomon Parker, Parker Farms, ParkerFarms.biz
    11 Years Treatment-Free, ~25 Colony Baseline

  10. #30
    Join Date
    Jan 2011
    Location
    Clackamas Oregon
    Posts
    759

    Default Re: Had to get my bear license

    After some guys stole the boat motor off of my aluminium boat I was going to bring home a utility power factor correction capacitor (we are talking big boys here) and charge it with a hi-pot to about 100K volts. My wife objected for the very reason that cerezh mentioned. Good advice here, the current needs a complete circuit (created by the bear and the earth). The better the path (chicken wire ground, open mouth, sweaty bee keeper) the more energy delivered to the target.
    “Why do we fall, sir? So that we might learn to pick ourselves up” Alfred Pennyworth Batman Begins (2005)

  11. #31
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    Mar 2011
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    Utica, NY
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    Default Re: Had to get my bear license

    Quote Originally Posted by Solomon Parker View Post
    Brian, the pulse is discharged every time the charger *clicks*.
    I thought they were much more sophisticated. It seems to me they could have a sensing circuit to first detect contact and as soon as contact is made then start "clicking" say for 3 seconds. Then it would last almost indefinitely being backed up by solar.
    Brian Cardinal
    Zone 5a, Practicing non-intervention beekeeping

  12. #32

    Default Re: Had to get my bear license

    Quote Originally Posted by Acebird View Post
    I thought they were much more sophisticated.
    And the next thing you knew, they'd have day/night image analysis built in to identify friend or foe....with terabyte harddrives, multicore processors, internet connectivity and internal cooling systems.
    Some things are better off left simple.
    Dan www.boogerhillbee.com
    Experience is a hard teacher because she gives the test first, the lesson afterwards

  13. #33
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    Mar 2011
    Location
    Utica, NY
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    9,799

    Default Re: Had to get my bear license

    Quote Originally Posted by beemandan View Post
    Some things are better off left simple.
    Not if they fail to do what they are intended to do. When that happens they are useless but still simple.
    Brian Cardinal
    Zone 5a, Practicing non-intervention beekeeping

  14. #34
    Join Date
    Dec 2002
    Location
    Denver, Colorado
    Posts
    5,113

    Default Re: Had to get my bear license

    Quote Originally Posted by Acebird View Post
    I thought they were much more sophisticated. It seems to me they could have a sensing circuit to first detect contact and as soon as contact is made then start "clicking" say for 3 seconds. Then it would last almost indefinitely being backed up by solar.
    The sensing circuit would have to be based on current traveling through the wire. The problem is, there is almost always something touching the wire, grass, tree, whatever. There would always be a connection being made, clicking off every 3 seconds, which is exactly what you have now. It would be even worse with my poultry nets which are impossible to keep off the grass and hard to keep off the ground.

    My chargers have a light sensor that allows you to change the click rate based on whether it is day or night. I have it set to go every 2.5 seconds in the daytime and 1.5 at night.

    They already last indefinitely with solar backup. My solar backup is powerful enough to power lights as well. If I could just find a decent 12 volt timer, I wouldn't need to run an extension cord out there every winter.
    Solomon Parker, Parker Farms, ParkerFarms.biz
    11 Years Treatment-Free, ~25 Colony Baseline

  15. #35

    Default Re: Had to get my bear license

    Quote Originally Posted by Acebird View Post
    Not if they fail to do what they are intended to do.
    Which is why I said some things.
    Dan www.boogerhillbee.com
    Experience is a hard teacher because she gives the test first, the lesson afterwards

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