Installing a windmill is something that I would not advise for novel installations unless you have a lot of room around you and quite a bit of spare time. Windmills, compared to solar are finicky devices and require a lot of thinking to get them right, solar power is much simpler.
The 'DIY powerwall' scene has turned recycling Li-Ion batteries into an art form, not all of it is done safely but some of the results are quite impressive, battery power too is now a fraction of what it cost back then and the life-span has gone up considerably, with more and more interesting options right around the corner.
I got blackballed for life at Avis for that stunt, they had an 'unlimited mileage' two week offer for very little money, they gave me a brand new car, I averaged 1000 per day or so :)
It was nicely broken in by then.