The financial case for the solar PV varies for each customer. You will need to determine what are the specific conditions of each client:
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Is the customer interested in cash or leasing for this project?
If they choose to do a lease, have you collected the necessary information to perform a credit check?
What incentives are the customers able to obtain? (You can check for available incentives at DSIRE)
After looking at the site plan, what are the possible costs before incentives?
What is the value of the annual solar power?
What is the estimated yearly production in kWh?
What are the financial returns after looking at the costs (such as IRR, NPV)?