First, it is suggested to get a few quotes. Compare them and make sure you are comparing similar items and if you see differences, ask about them. Pay attention to the cost per watt. You can figure it out by taking the total system cost (minus any incentives) and divide by the solar system size to determine the cost per watt.
Make sure your system size and type of solar panels that will be installed are in the quote. That way you can do research on the quality of the panels. Pay attention to the long-term power generation of your panels; they vary from company to company.
Look at the warranty offered by your installer (labor) and manufacturer, the quality of your equipment and nail down your completed by installation date.
Get everything in writing. Make sure your salesperson has included everything you were promised in the terms of the contract.
