Yes you can run a ground wire from your charger to your metal roof. If you have a hot wire around the top then the roof will be grounded,
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Awesome infoI have a ground rod that's attached to the charger of course, but everything I've read says that if the animal only touches the hot wire and is not itself grounded (feet on the ground), they won't get a shock. Not true? Reading below it seems as if the fence itself would be enough of a ground for the run wire, but for the coop wire I'll need to add a ground. Not sure if I should add a wire above and below.. or would grounding the tin roof work?
Tall Fences
If you already have a chain-link or tall wooden fence and want to mount electric fence wires on top of it you must first ensure that the invading animal isgrounded at the moment it touches the electrified wire or wires. (See also "How does an electric fence work?") You can do this in 3 ways:
1.) For a wooden fence run a 6"-12" strip of bare chicken wire (no vinyl coating) along the fence at a place where the animal's feet will be when it touches an active (electrified) wire with a nose or paw. Then run a grounding wire (electric fence wire or insulated wire) from the chicken wire to the ground terminal on theelectric fence energizer.
2.) For a bare metal fence (chicken wire or chain link) no grounding material is needed because the fence itself is a conductor. Be sure to keep the electrified wire out of contact with the fence at all times. You will also need to run a wire from the chicken wire or chain link to the ground terminal on the electric fence energizer.
3.) You can also run a ground wire in parallel with the active wire at the top of the fence, keeping the active and ground wires at least 4" apart. In this case the animal will have to touch both wires at the same time in order to be shocked. You will also need to run a wire from the ground wire to the negative terminal on the electric fence energizer.