In order to properly design, size and quote a system to a customer, you will need to collect some information from the customer:
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What is their annual demand for electricity in kWh?
What is the rate structure? (There are four types - Seasonal ; Flat ; Time of use rate, which vary seasonally and hourly ; Tiered Rate that increases based on kWh during a month).
What is the type of Roof?
What is the condition of the Roof?
How easily accessible is the roof?
Roof Azimuth/Orientation?
Is there a tilt of the roof from horizontal?
What is the estimated roof surface area available for the array? (draw sketches and take pictures)
Is there any shading areas?
Does the worst part of the roof have any sun access from 9am to 3pm?
What will be the array location and its size?
Is there room space for a DC Connect? Inverter? AC Disconnect?
What is the conduit location and the length?
What is the manufacturer of the service panel? What model is it?
WHat is the main break or rating of the bus bar?
What is the location of the Utility Meter? The Service? The Subpanel?
What is the space available for the breaker?