DNR told me he likes to see at least 3000 volts. 5000 is better. Make sure you use proper ground rod and copper wire from fencer to ground and to hot wires. He says three wires/poly tape is enough, 6 inches off ground, 18 inches then about 28 inches. He said bears do not go over fences they go under them. Keep hives at least four feet from fence because they will reach in and pull them out.