I've used a 3 wire electric fence with teflon 4' posts in long runs and 4x4s at corners and ceramic insulators screwed into those for 18 years here. Works fine for keeping hooved rats out (some people call them "deer", no dear to a gardener). Bottom wire is placed at bottom spot on the teflon posts, about 4" up. Middle wire is between bottom and top wire. I use the lightest weight wire, as it's the easiest to work with.
Buy the teflon posts at TSC or Lowes/Home Depot. They have a metal bottom point with a stepping point to allow you to just push them into the ground with one foot.
I use the "15 mile" fence charger powered by a 12v utility battery kept charged with a little 50w solar panel. Battery typically lasts about 3 years. Charger goes for about 6 or 8 years. Solar panel is still good at 18. I just mount a bucket horizontally onto one of the 4x4 posts and slide the battery into the bucket with side holes for the wires, etc.
Every so often, certainly at the beginning, you have to "bait" the electric fence either by smearing peanut butter onto the top wire or by placing strips of Al foil with peanut butter smeared onto it.
I'd also advise getting yourself a kill permit from your game warden and a 410 shotgun with "buck" shot. Take out a few. I'm up to about 35 now. Buzzards will take care of the carcass if you have no outlet for it. We've eliminated their preditors. They're only here for US or the buzzards to eat now. So no other use for them. They're not cute.
Ralph