Hi FB.
It seems you've done the analysis (assuming correct performance figures) and now you've come to a decision which is a client decision not really an installer decision. Now it comes down to other considerations.
Capital outlay.
Aesthetics.
Possible alternative use of roof space.
Weight on roof.
The only thing i would say is that you are considering first years returns only, i know this is correct from a sales view, but it is worth considering your return 5/10 years down the line if you think power prices are going to increase quicker than RPI then a system producing more electricity will start to give extra returns as a higher proportion of the total return will be savings (if they use the energy).
It seems you've done the analysis (assuming correct performance figures) and now you've come to a decision which is a client decision not really an installer decision. Now it comes down to other considerations.
Capital outlay.
Aesthetics.
Possible alternative use of roof space.
Weight on roof.
The only thing i would say is that you are considering first years returns only, i know this is correct from a sales view, but it is worth considering your return 5/10 years down the line if you think power prices are going to increase quicker than RPI then a system producing more electricity will start to give extra returns as a higher proportion of the total return will be savings (if they use the energy).
