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Electric Fence Question

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I'm setting up my first electric fence (ok, converting a horse fence to a sheep fence) and I'm having an issue (I think) that I'm not sure what to do about.  Details:

Ground rods in super saturated soil
(4) hot wires - (2) uppers are piggybacked together and (2) lowers are piggybacked together.  Cut-out switches at upper and lower groups.
Wood posts at ~ 10' oc.  All screw in insulators used.

Currently, there is heavy vegetative load on the lower (2) strands.  When all (4) strands are powered, I am getting readings of around 3.4 kV anywhere on the fence, including really close to the source.  When I open the cut-out switch so the upper (2) wires are the only ones with power, voltage goes up to as high as 9.2 kV anywhere in the system.  However, this is an inconsistent voltage.  The cadence of the pulses varies and voltage numbers bounce all around from 0.1 kV all the way up to 9.2 kV.  Is this indicating a leak in the system somewhere or do I have something else going on?  My fault finder does not indicate there is a fault in the system, but it seems odd to have the voltage fluctuate so much.  The upper (2) wires have very little weed pressure on them.

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Location: Virginia USDA 7a/b
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I am not an expert here, just designing a sheep fence right now. So free advice, may be worth what you pay for it.

What is your intent on the fence? Keep sheep in or predators out? Flighty sheep or domesticated sheep? What predators?

Big predators or exclusion of other animals needs big voltage. I have a small (I think) solar 0.6J system for animal retaining. Due to the fact that this goes in fairly high forage I'm ok with >4k V. This is the mobile paddock, and is not really for large predator protection- that's the perimeter fence.

Perimeter is grid powered, and aiming for >9k V. This with intermittent charge should keep weeds from growing into it.

Based on the presentation, this is bad contact to the fence, really low resistance short or a faulty charger. 0.1kV seems really low even with heavy weed pressure. Check output directly from the charger, then isolate the fence in a weed free area and dry-test it if you have a moveable system (sounds like you don't have that). Since yours is on fenceposts I guess see if your can isolate different runs with a car battery and portable charger and see which one is your low resistance run.

If you can get your hands on one, you can use a clamp-type tester to see roughly where you are losing if you can isolate as you go along, adding runs. I have one that is very portable. Unfortunately for troubleshooting there is no way I know of other than breaking into units and testing each added section.

"To do good, you actually have to do something." -- Yvon Chouinard
Whom would you place at Level 9 on the Wheaton Eco Scale?
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