yes I was talking about rigging up a either cattle type or a camping type e fence wire
and yes I was thinking of a solar powered one, or one that runs off D cell batteries
they sell very small kits these days
as if you have plastic or wooden hoppers critters can eat holes in them, costing you $$
I know I had a few chewed up on me yrs back

them metal plates can work , but still seen critters chew past them