This past year, 2015, was the first time we had ever taken the plunge and put up an electric fence. Overall, it worked out very well for us. Really short description of our "system"...three total strands, two strands on one set of poles on the "inside" and one strand on the "outside" pole.
Inside pole...one strand at 18" off of the ground and the second strand at 36" off of the ground. Outside pole...about 36" outside the inside pole and the one strand was at 24" off of the ground.
Clearly a deer could jump that...but they hardly ever did. I only had to repair downed strands a couple of times and I suspect those were cases where the bucks were chasing does during the rut, perhaps even at night, and the chasee ran into the fence causing mostly minor damage.
I used a solar powered charger and it worked well all of the time the fence was up. We put it up around a bean plot sometime in early July and took it down after Christmas...at which point the deer began using the preserved beans very well.
Look up the subject here on IW in Dbltree's Corner and also on Outreach Outdoors, where Dbltree also posted a great deal of information. I pretty much based my setup on what I read in those threads.