Nice setup! Having 8 week old piglets tossing dirt on the bottom wire can be a thing yes. We raise it as they get a little older but I agree all fences should be checked as part of a daily routine. We use the Gallagher S10 solar panel for years now and even though it should not have a very strong spark we did not have any breakouts. I love these little mobile things. We also have a mobile pig shelter. I still need to put gutters on there to collect rainwater. Winter project.

One thing to add is that pigs can't take heat so they need shade and a mud bath (keeps their skin in good condition). If you pour water somewhere they will dig the hole themselfs but some people use kiddie pools. Note that they will flip over any sort of container even if you put a brick or something heavy in it so make sure to secure whatever you are using.