I am planning a small duck/goose yard next to our pond which is surrounded by field fencing. I would like to build a simple shelter that is somewhat portable and surround it by electric field fencing. I looked at the Premier website and found the shortest roll available is 82', which would be quite large enough. I am confused as to which type of fence energizer I will need. Seems like most of them are designed to power much more fence that I will need. There is no power supply out there, so it would need to be battery operated. Anyone have experience with this setup? I would like a balance between functionality and economy, but figure the budget to be about $250-300 for the whole fence. I am leaning toward a power supply bigger than I think I need so I could expand or use the same one for goats, etc in the future. Is it really predator-proof for nighttime? I am not worried about owls so much since the geese will be in there, but we have fox, coyotes, raccons, etc. Thanks!