Thanks all! Good input, many variables to consider. I certainly wouldn't expect 400w constant output, and I had noted that the altitude hits the efficiency. I have the RV to anchor it too, so I can make a nice tall mast (grounding it is a very good thought!) The turbine does have a brake so overspin...

I'm setting up a charging/power system for this year. It's my first go with an RV (lucked into an old freebie that I can gut and set up just how I want.) I'd love to avoid a generator and I don't want to fire up the RV motor ever once I park. I'll have probably 4 12v batteries wired in parallel so a...