No less than a 1 Joule energizer or up to a 3 Joule one for predator control. A prefabricated fence that has 9 horizontal twines (8 conductive); is 35" tall installed, and has large white plastic vertical struts every 12". White PVC posts are built into the mesh every 12.5'. When energized, it is nearly an impenetrable mesh to sheep, goats, coyotes and doe's.
Set up is fast and easy and this kit includes a warning sign, corner stakes, repair kit, and installation instructions.