30$ Open-Source Wind Turbine: http://www.poc21.cc/30-wind-turbine/
https://www.instructables.com/id/Vertial-Axis-Wind-Turbine-from-30-Of-Scrap-Materia/
- Generates 80W in a 25 km/h wind up, or 1000W in a 60 km/h wind
- Max. costs of $30 per unit, mostly from scrap materials
- Can be assembled by 2 people within 6 hours
