We currently have 10 panels which produce around 18 kw a day in summer and 2kw in winter, all this is sold to EDF and we get around 1400 euros annually. We are starting major restorations and are considerating all energy options , u/f heating , solar ,batteries , heat pumps. etc. The major problem we see is that if we size the project for winter usage when we need it most then there will be wasted production in summer as we are already on the maximum level for private selling back to EDF. And again the costs and hassle of installation versus the benefits ,we pay on average 18 cents kwh for day time usage, this will of course rise , but the only way I see of re-couping the outlay costs is if we sell up.