"Capitol" wrote in message
...
The bit I haven't understood is why a roofing company hasn't come up with
a solar panel roof? Or have they? I can't see the case for drilling holes
to install panels on top of roof tiles/slates.

They have. Intended for complete re-roofs/new builds.
The individual tiles type are a joke, both in terms of expense and
performance.

There are others with large interlocking panels.

The problem is the are unique, if the firm went bust and you needed just one
replacement panel, you would be buggered.

The term for the technolgy is "integrated solar panels/roofs".
The whole roof becomes a solar PV panel.
http://www.spiritsolar.co.uk/solar-p...integrated-pv/
Another disadvantage is there is no cooling air beneath the panels which
reduces efficiency.