Personally don't see much of a problem with ridding the world of a few rabies-infested raccoons (worse than possums). My chickens are on my land, which has no electricity, but is only a couple miles from my house. Before I was able to bring them out there, my wife insisted I make the run predator proof. Being the tinkerer I am and belief I'm always broke (dad grew up during the depression so I inherited a figure it out with little money attitude), I made a solar and battery powered electric fence for around 100 bucks total. The actual shocker was a bit of an overkill, but I couldn't find a small 12V powered one. I bought the parts from eBay and amazon (10W solar panel, charge controller, and 12v sealed lead acid battery for about 15 each, and the shocker for 45). Have not had a problem in the two months its been running. Even if it rained for several days, the battery will keep it going. I did finally add a switch that's accessible from the outside to be able to shut it off when the kids come out.