For those that don't use things like PV Sol already, http://easy-pv.co.uk/ may be a handy tool for you.
The schematic tool and the roof loadings tool look particularly useful.
It's made by Midsummer Energy and you can only use their panels though.
The schematic tool and the roof loadings tool look particularly useful.
It's made by Midsummer Energy and you can only use their panels though.