"Nigel" wrote in message ...
Thanks for all the feedback. The problem we have got is that we live in
the Alps so the sunlight in the winter is quite short as soon as it dips
below the mountain the sun is gone.

However we do have a south facing roof so it does get a fair bit of sun.
How does the snow affect it??

It will block the sunlight until it melts. The snow on the panel might melt
more quickly than that on the rest of the roof.

Mary