WordPress Solar panal calculator plugin

Hello,

I'm building a website in WordPress for a solar panel company in Australia who sell and install solar panel to consumers.

I'm in need of a calculator WordPress plugin which is able to dynamically calculate the costs of a solar panel installation according to the amount of panels, size of the roof and so on. And see how fast their investment will pay it self back. And then contact the company for a quotation.

A special feature they want is that a customer can measure their own roof via Google Maps satellite view ( example [url removed, login to view]).

Can anyone help us with this?