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To subsidise the solar power supply, we were strongly advised to  add at least one wind turbine. We purchased a kit from China; 500watt output at 12v. We will add at least one extra turbine in March 2019.

If you divide the cost by the wattage output, wind power generation on this scale is 1/3 of solar power and can provide energy up to 24hrs a day.

August 2018 update; the post was extended by another 4ft and made a large difference to the daily power generation.

Wind power

Astronomy Roadshow Observatory Project in Apache County, Arizona, USA