you need a fence charger that delivers a minimum of 2,000 – 3,000 volts on the fence line. Voltage levels are impacted by vegetation on the fence line, length of fence, and type of wire.
Fence chargers are available in different models...2 mile-—5 mile-—20 mile—50 mile, etc. I have a 20 mile model on my horse property of 5.58 acres.