I got this from Robo about a Yr. ago
I have tried a few over the years and Parmak http://www.parmak.com/
is my brand of choice. They are very reliable and they have great support. I have one that has been running 3 years non-stop. I watch eBay and buy used ones and then ship then to Parmak for repair, It can be a lot cheaper that buying a new one. Occasionally (once a month or so) there is a guy in Texas that puts up a new one for $125 on eBay. I've bought one from him for a client and it was perfectly fine.
As far as fence, if it is a permanent yard, I drive T post in the ground and run 3 strands of wire. For temp yards I use the push in plastic posts with 2 or 3 runs of the string line. They key is to bait the wire by hanging strips of #8 hardware cloth with peanut butter on the wire. Without bait, they will just plow through the fence and be insulated by their fur. With the bait, they get nailed on the nose or tongue and never come back. I've had 4 bear in my yard at one time, and the only hive they got was a nuc I had in my garden that was only protected by 8ft high fencing. They ripped right through the fence. I had a trailer with 8 full hives about 10 ft away protected by the temporary electric fence and they never touched them. They also tore the door off my chicken coop to get at the feed, and were back every night, until I put a single baited strand of electric wire around the chicken coop, never had a problem since.
I also use the non-solar parmak's and power them with a standard 12V wall wart with no problem. For the 6v ones I just use a couple dollar voltage regulator. I also have converted a non-solar unit to solar by putting a $20 car solar panel on top and using a 12V car battery.
I have never had a lightning issue with the parmak's like I did with most other brands. I also had bad luck with the Zareba solar units, if they weren't in direct sunlight for 8 hours a day, they would not get enough charge to continue working. I have had the parmak's go weeks with the solar panel covered with snow and still work.
There are some other high end units out there like gallagher that I have no experience with.This is what I have for a charger
One of the larger queen breeders in New England told me he likes the 1.5" white ribbon for permanent fence and 0.5" white ribbon for temporary . It seems that the bears are fascinated by the way it flutters in a breeze and touch it with their nose. Won't do that again.If you use wire to increases the visibility of the wries put on fence flag that will move in the breeze.
BEE HAPPY Jim 134