"just looking for a way to use a small wind turbine to charge a battery in a disaster preparedness kind of way"
The machine will be flying and maintaining an unused 12V bank, waiting for a disaster?
The battery bank will not be huge AH? (seems kind of silly to spend big bucks on a mostly unused battery)
"with no charge controller"
~300W of 12V into a lowish AH battery with no charge controller does not sound like a great idea to me.
100W for a whole day can do some damage to a fully charged smallish 12V battery bank.
You have heard of the "ghurd controller", right?
G-