> I don't know. I think trying to track the sun with PV panels based solely=
 on time
> and date is a little suspect.
> As you've pointed out, you need a _very_ precise long term clock, but you=
 also need
> angular position of the panel as well. How are you measuring that? What's=
 it's
> repeatability and reliability and how well is it calibrated during instal=
l?
> I would think that some type of sensor that finds the brightest spot in t=
he sky
> would be a more consistent solution.=20

Come late to this conversation after being on holiday.

Rather than a single sensor looking for the bright spot, use two sensors, o=
ne each side of the panel, and the panel moves until they are equally illum=
inated. I believe this could be done using a hydraulic system in places tha=
t are warm enough, so it wouldn't require any electronics at all.
--=20
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--=20
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