Installing solar means paying a large sum once for savings that arrive over years, so hesitation is natural. A calculator that takes the electricity bill and returns an estimated saving turns the idea from "expensive" into "an investment with a return".
A quote in this field needs data: area, roof type, consumption and location. When that data is gathered in the survey request from the start, the engineer arrives prepared and the quote goes out faster than a competitor who is still asking questions.
After installation, a customer who can see their system's output day by day is your best advertisement. Completed projects with photos and capacity on your site, and a dashboard where customers follow performance, turn every installation into a new referral.