Zareba 50 Mile AC-Powered Low Impendence Electric Fence Charger - Contain Pigs, Goats, Horses, Cattle, and More - Keep Out Predators - For Heavy Weed Conditions - EAC50M-Z

I'm in the thick of bear country, they come through almost every day. The big thing with an electric fence is to make sure it's powerful enough for bears. Those little portable mesh chicken fences are super convenient but always reliable against a big determined bear. The recommendation I've read is at leat 1 joule for predators; my charger is 2 (I use this one, though I'm fortunate enough to have convenient AC power) and my beehives are the one thing the bears won't mess with, no baiting necessary.