I have a 4.2kw pv system that gives us 100% of our power needs over the course of a year. We had huge problems with the planners when we installed the system but battled through! We also have a Solar Twin hot water system which is ok but it's a flat panel system and not a patch on the evacuated tube version.
I have been an active environmentalist since the early 1970s. Since 2004 I have run a vegan guest house in the New Forest - I believe it is the only fully solar powered guest house in the UK - unless you know better!