Mini Wind Generator @ Menards?

I went wandering in the electrical department at Menards recently and came across this 400 watt wind generator that was among a few different alternative energy supplies like small solar panels.  You can see on the box that it has a few applications like power failures, remote and backup power.  And, that had me wondering if you could fire this thing up and have it provide backup power for our house.

After reading the reviews, people *are* using this type of product for power, but it is mostly off-the-grid folks who are using this to charge a battery, which then powers various portions of their home/shack/what-have-you.  So, if I have a battery backup system for say, my sump pump, I *think* I could use this to charge *that* battery?  Not as cool as it seemed in my mind when I was in the store.