If you have the money go for the panels that produce electricity they cost about £12000 but you get about £850 per year from the goverment which is more than you can get from a bank in interest plus you get the electricity to use and if you do not use it you can sell it back to the electricty company,also the £850 in guarrenteed for 20 years so you get all your money back,be quick because this is not going to last,only use licenced installers do not use the ones who say they will do it free.