John Grabowski wrote:

That's a nice set up. I was wondering how you shut the panels down for the
summer?

They're controlled by earth's axial tilt. In summer, the light is
reflected to the ground in front of the panel.

As winter approaches and the sun appears lower in the sky, the
panels "turn on" - and in areas where there's snow cover, the
amount of heat produced can almost double as the panels absorb
snow-reflected energy.

In summer, some energy will still be collected due to open-sky
radiation and reflection from terrestrial objects, and the panels
can be shut down completely by installing an opaque cover.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto