mathey, thats a great idea, I'm not sure how much zip a 3 mile solar unit has but I've gotten a bit hard of hearing working in a print shop the last 30 something years and I never use less then a 20 mile AC fence charger but what works for me is go out at night when its good and dark, I don't have to rely on hearing the pop I can see it arc wherever its grounding at. As far as the fellow from NY I wouldn't worry about anything touching the ground wire maybe even the more the merrier since it would just give you a better ground, its only the charge wire that you are concerned with grounding out, which is how the charger works so the less touching the hot wire the more jolt you have in reserve for the beasties that your trying to keep in or out. I rewired my wifes garden last weekend its rather large so I can plow and disk it with a 90hp tractor. I had used tpost for post and the chargers I use were powerful enough to arc across the plastic insulators into the tpost, I changed to the ceramic insulators and cedar post, I'd expect if you leaned on the fence now it'd leave a welt, with a insulated handle big screw driver grounded it will arc over a 1/4" and leave a dark spot where it arc'd. After warning my honey of this she was out working on her garden a few nights ago and stepped back into it and got zapped on the butt, did you know a 45 year old woman can stand flat footed and jump a 4+foot fence. I learned another lesson to boot you shouldn't laugh if you see her do it or you end up in a foot race.
Steve