Listen to the gas engine that is turning the generator, it's not under load when he flips the switch, I suspect that he has more then his old charge controller burned out, those switches he is using are often rated at 15 amps, the 20 and 30 amp versions are out there but harder to find but he really should have a DC disconnect breaker instead of a toggle switch, so given that I would guess that it's his own poor design that is causing this not to work.
A string of light bulbs right on the generator would be a better test without mailing it back.
But how he starts out the video showing his wind "turbines" that are on a 40 foot pipe surrounded by 120 foot trees... he might as well have them inside his basement next to an open window and ask why they don't work, 50 feet above ANYTHING within 500 feet is the standard rule, main reason for that is that the higher you go the greater the wind speed and that when you are to low not only is there less energy but the difference between the energy in the air at the top of the rotor and the bottom tip of the rotor can be enough that it will destroy wind turbines, not so much an issue with these little toy turbines that put out a few watts, but as you get bigger you can have twice the energy hitting the top tip of the blade compared to what hits the bottom tip, that is, if you are to low and close to ground clutter.
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