My dad likes to use the hotwire fence when he's out with the horses. He bought a battery powered unit. With four D-cell batteries, it advertises it will last up to three months. The unit he bought will also work with a 6 or 12 volt vehicle battery (has a switch for voltage). The unit cost just under $100 at a local hardware store. He also bought 1/2 wide electric fence ribbon, I think it was about $50 for 300'. Tractor Supply carrires both chargers and ribbon, but I don't recall seeing a D-cell battery powered charger there.
He currently uses it full-time in his corrals to keep the horses from tearing down his fences. When he goes on a pack trip, he just puts in the batteries and packs it in his paniers. The unit is only about 4X6X9 or so. Couldn't tell you the brand name, but I might be able to get it from him later today. He's pleased with it.
He made a bunch of steel stakes he drives into the ground for anchors. Then he slips pieces of 1/2" PVC pipes, with slits cut in the tops, on the stakes to hold the ribbon. Compact and lightweight for packing.
If you want to go really cheap, and are handy, I found a DIY plan for a portable fence charger that uses D-cell batteries on the Internet. I may give it a try just for kicks, but for under $100 you really can't go wrong buying one.
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Last edited by thenrie; 08-12-2013 at 05:27 PM.