> Ah.  I don't have any problem believing that the gain from
> tracking is substantial during the "early morning" or "late
> afternoon" phases of things.  But I think the claims is that
> for the whole day the difference is smaller because most of
> the energy is going to show up in that 9am-3pm timeframe where
> tracking is less critical.

Applying my assumptions from prior post to 9am - 3pm gives a tracking 
gain of only ~10%.

So. most of the gains are, as expected at the ends of the day.
Checks ...
Yes, the 6am - 9am tracking gain is 2.07:1

ie 1Q & 4Qgain is 2:1
2Q & 3Q gain is 10%
Overall gain is 27%
Those figures can't be linearly added as both raw insolation and 
tracking gain vary with angle.


        Russell




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