I haven't done it yet but it is on my 'to do' list. I was thinking of getting an old metal locker type box, drilling holes in the top for the fence wire, and in the base for battery/earth/drainage wires, then chaining the whole thing to a wooden fence post. It would slow the thieves down I reckon.
Exactly! Find your nearest stockist of fencing materials, find an NZ company called Gallagher, and buy yourself a length of what's known as "underground cable". It isn't expensive.
Strip off the last 3 inches, twist it TIGHTLY around your fence, and then feed out the remainder of the cable, to where you've hidden your unit and battery.