App module suggestion

I've got an idea for an app but sadly no coding knowledge to develop it with.

I have a Solar PV system as well as 2 hot water heating diverters and one question at the back of my mind is what would the addition of extra panels do to my grid consumption and export. Down here in New Zealand we get a pittiful 7C (around 3 1/2 Pence) for export which is 1/4 of the import rate so exporting is bad, and importing is worse.

As any shortfall in Solar production will lead to water heating later in the week this isn't as straight forward as it looks.

Now that decent export rates are disappearing sizing a PV system so it covers as much as possible without excessive exporting will become more important.