I have been debating this subject for awhile now too. I only have six acres, but the place is 200 ft wide by 1250 feet long, and of course where I want the fence is on the wrong end of the 1250 feet!
Well, while reading on the net about this I've run across more than one New Zealand website that mentions this: "American electric fences are overbuilt and underpowered." Which got me to thinking, and checking on the price of chargers.
Tractor Supply (it might not be the best place to buy a charger, but it was close for price checking) has various chargers. The one I am now buying costs $100, and is a "50 mile of fence" (1.5 output joule I think, maybe it was 2). The same priced built in solar and battery models were far less impressive in stats. With all my future fence plans included: all the pig pens, the cross fencing for the goats, containment pens, and even with a six strand fence my totals came out to just over a true mile of fencing. The chart on the above mentioned charger claims that with one mile of wire the fence will have 11,000 volts on it... which I'm thinking will be enough to keep animals from touching the fence on a regular basis. :baby04:
With such a strong charger, unless your power is VERY far from where you want the fence, you could put the charger where your power is, then run the fence to where you want it... and good sized charger gives your room to expand as well. In my case, I'm only fencing off about an acre this month, but before I am finished I'll have over a mile of wire on the place.
Anyway, I hoped I made sense.... tired
Rowdy
Oh, here are a few links:
Mistakes to Avoid with electric fencing
Fence design-small article
Large list of links concerning fencing
Another How To with diagrams