mike wrote:

Then I turned the panel ever so slightly away from the sun.
I was amazed at how dramatically things changed with just
a small angle. Looks like I'd gain WAY more watt-hours/day
by tracking the sun
than by anything else I could think of.

Yep. It doesn't take much of an angle from perpendicular for a
silicon cell to act as a pretty fair mirror.

--
John Popelish