We bought some pos/neg fencing and had a colony-style set up in it last year spanning across parts of winter through to late summer. We used 4 ft tall fence and leaned the fence in so that digging around the perimeter would be discouraged by the proximity of the hot wires to the ears of any diggers. It wasn't 100%, especially with very young rabbits who were small enough to fit through the netting, but the social structure tended to keep the rabbits in and there was plenty of room for the rabbit hierarchy to play out in. We had two 80 ft lengths of netting and the Premier 1 100(?) solar energizer. The rabbits didn't prefer our provided housing and made several burrows, so they ended up staying in one place longer than I would have liked, but this could be overcome with experimentation (see the Coney Garth, Julie Engel's movable pastured rabbit set up). The main issue that was worrisome about the electric fencing was during wet and cold weather when we had ice accumulation on the fence; we didn't lose any to predators, but it basically left the colony unprotected due to grounding out and the fence falling over from the weight. We might revisit this one day, but our situation is different now and we no longer raise rabbits.
