The reason I am posting this is so YOU CAN CHECK OUT THE RECTIFIER HE IS USING.
I didn't know it was that simple to convert AC to DC!
The funny thing is that I understood instantly the principle of what he is doing and I never thought of it! I own $40 rectifier boards for AC-To-DC wind turbines and always wondered what I would do if one of them broke down in the aftermath. This is the sole reason I have always encouraged people to use pure DC turbines as generators because they will work without a rectifier and a simple shunt if they generate too much current. Now that I know this is possible it opens the possibility of using a lot of different kinds of fans that normally output AC and can be found in almost ANYTHING in a post-apocalyptic world.
If you don't mind the cosmetics of the situation, you can mount these in arrays and use micro-wind generation of electricity from what is literally ubiquitous junk found everywhere!
With motors balanced on these kinds of ball bearings you could use different kinds of motion to generate current. For example, putting them with blades under a downspout so whenever water pours through it the blade spins. During a rainstorm you could charge your batteries just from the flow of water down a gutter!
We will be getting into all this in 2017. Vault-Co is about to get really good. Those of you who have been reading for a while are going to be pleasantly surprised at the change in direction and content that is coming. I am very interested in these kinds of technologies that turn junk into generators without monolithic wind turbines and huge rectifier boards, etc. They may seem tame individually but once you have a dozen wired together and working you're starting to talk some serious juice coming out to power a shelter or retreat which is itself designed along low voltage philosophies.