FWIW, I have had solar PV since 2011. Very expensive to install then compared to now, and newer panels are probably more efficient, but we do get a good FIT rate from being in so early. Up to a point, our longer summer days up here in Scotland's "cold shoulder" go some way to make up for the lower gains in winter. The system has now paid for itself, so inputs from now on are positive.Fascinating thread folks. Thanks for all the detailed inputs. Are there any recommended sites where I can look at info on sun levels for each area? I’m Aberdeen based so I think this is a non starter as our days are so short in winter. But with the new price cap I’m investigating all avenues.
Daughter and husband in next village have both PV and solar thermal, with some quite sophisticated control circuitry to dump any currently unused current either into a phase change heat store, or now, into their Renault Zoe. Means local use of the car is pretty good economics. NOT so good when working on Islay, and all the charging points are dead!