Second conversion from 24 to 12 is better less cable losses from the place you have the turbine to the miner
also if the turbine has too much wind produces many volts and amperes (common problem of wind turbines)
you have to bypass the miner at these times so need a special bypass switch
Dont you want to purchase solar panels In the north you will have more sunny days in the summer!!!
I thought the same thing regarding unreliability of the weather. So then I remembered that thing where someone had an exercise bike hooked up to some sort of power generation system. If that could work it could really be something. I can just imagine putting my whole family to work on an indoor exercise bicycle!
Here we go: http://www.adafruit.com/products/1533?gclid=Cj0KEQiA8rilBRDZu_G8hszXraoBEiQABlB9Y2JQ_1TgUvy4QE_UVuFXLJ4GCl_fvgfkrXwbmRRPqcEaAoL18P8HAQ
And of course there was that soccer ball that was made to be kicked around and then plugged in for a lamp... but not very practical