> It's uncommon, but a wind generator can help a lot

It's uncommon for a reason. Wind generator capacity rises with the square of the rotor diameter. That means small-ish generators (let's say "small enough to be roof mountable without additional mechanical supports") are significantly below 1 kW of power. Seriously, the systems people by for their sailing yachts make around 50W from a nice breeze - enough for lights and to trickle charge the battery while docked, not nearly enough for a fridge.

Combine that with quite a number of moving parts, changing loads and exposure to weather, you get very short maintenance intervals and final lifetimes.

If you have any other option for power, its almost always economical to just use that.