Hello,
Just reading back over the posts, and thought that a home wind generator might be a good idea as it would supplement the winter power supply. The .gov link below is pretty good.
https://www.yourhome.gov.au/energy/wind-systems
I loved the aesthetic of your obs of choice, I'd be worried about a restaurant wanting to open on the 2nd floor.
Steve
Ps. Perfection by definition is stagnation...
PPs. Checked ebay for wind generators, seems like you could power a obs battery bank fairly cheaply. "500W Wind Generator DC 12V 3 Blades Wind Turbine With Charge Controller - $170". However I might suggest your final buy is not from ebay for those and a little larger.