James Newtons Massmind wrote:
> Sadly, many years of attempts have shown that the best solar tracking is...
> No tracking at all. Mechanical systems fail and so require maintenance. In
> every case, the cost of maintenance exceeds the increase in power.

A friend of mine has a system that tracks the sun but has no motors or 
electrical control system.

His setup has a differential set of pipes with a working fluid that 
evaporates when in the sun.  The fluid condenses on the side in the 
shade and creates a weight imbalance which makes the panels rotate until 
there is equal weight on both sides.



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