Solar setup just for a security system cove or simply safe

I have some vacant homes and most have regular electrical service. However when I purchase a property without the ability to get power turned on due to inspections needed and necessary upgrades I still need to stop break-ins and protect against squatters. Anyone have a solar setup if so what are the components? Currently using charge packs that need to be changed about every 32 hrs. It's not the end of the world but it's a lot of time to do all that so looking for an alternative Thanks