I have built & used thermal solar systems since 1976 & have a grate interest in any form of renewable energy. Now using a combination of PV & thermal systems for my house plus a controller system of my own design for energy optimisation in my home.
Always do your homework before embarking on a new project. Find & talk to people who have had several years of experience with the type of system you are considering. watch out & check all the new regulations covering your intended project, they can be very strict if you are intending to connect up for a Feed In Tariff.
Good Luck !.