I bought about 10 of those little fiberglass, step-in posts and one 650' roll of the fiberglass rope with copper wires in it and we used the solar charger that we already had. It was only about 100' from the corner of the barn to the perimeter fence so that's why there's so many strands. We really didn't want to cut it, in case we needed to use it somewhere else sometime, so we just went back and forth with it until we used the whole spool. The charger was meant for 25 miles of fence, so it's a bit of an overkill, but it's very effective. Lee said that he thought he could see a corona around it. ;o) Poor little Ellie found out how strong it was with the tip of her nose, right off the bat. I thought she was going to flip over backwards.