A few months ago, we had to put up a solar electric fence for a horse, fast. (As opposed to a fast horse, unless you're talking about eating speed.)
I went into an electric fence retailer and stared at the shelves of equipment, not knowing I would need:
The energiser, with compatible battery and solar panel, connected to an earth (about a metre long), with galvanised wire:
And connected to the (in this case) 25mm electrical fencing tape:
Wooden posts at each corner, with special corner tape-holders:
Enough plastic spacers to have one every 12 metres (yards) or so (these are a bit rubbish, as the tape-holding bits tend to break - but this is fixable with more wire) - they're utterly unworkable as corner posts:
And a gate kit:
When you run out of tape, you can simply tie on some more, stripping back the plastic to expose the wires, which you can then twist together to keep the current flowing:
We also use the electric fence string and isolators screwed into wooden fence posts, in our Mark II veggie bed that the pigs have nearly finished clearing.
I hope this helps you as much as it would have helped me.