PSYOP
Make the property look like it has security. Use fences, dummy cameras, dummy key fob entry, and caution signs. "Caution sewage treatment area" signs could go a long way.
Even with a battery based system you will need a charging source. Solar is okay but it is often impractical for wooded locations. A generator on a timer may be an option.
:tsk:
I don't see a topo map. You plan on a complete SHTF scenario where you have to land navigate the eastern US and don't even have a map. If you are that afraid, don't go.
Cash.
Not every SHTF scenario will be Armageddon. If phones or power is out cash goes a long way. If you are having mechanical problems 6:30 pm on a Friday, a couple hundred dollar bills is the difference between "we're closed" and "how can I help you". It is amazing what doors Benjamin...