Zenith Solar is certainly more advanced. Thanks for pointing it out.
The difference between the two projects though is open source vs proprietary. Zenith looks very impressive but Solar Fire is meant to put solar power cheaply and easily into anyone's hands. They are both worth following IMO
No, I don't know, but could investigate. It'd be interesting to see a device that was placed in a location over the course of a year and measured different facets of sun and wind for that location and enabled simulation of various technologies.
Each ZenithSolar Z20 unit generates 5 KWh Electricity plus an additional 11 KWh hot water (up to 100 degrees C). 18 units at Kibbutz Yavne are now providing all the hot water needs for 400 people, the electricity is all be sold into the electric grid. ZenithSolar is now installing new fields in Australia and China...firstname.lastname@example.org