Getting more than one quote is one of the best ways to understand what a fair price looks like in your area. Different installers may suggest different system sizes, equipment and financing, so the lowest total isn't always the best deal.

Line the quotes up side by side. Look at the system size, the estimated yearly production, the price per unit of capacity, the models of panels and inverters, the warranty terms and the timeline for permits and installation. Ask each company to explain any big differences.

Be wary of high-pressure tactics, such as a discount that disappears if you don't sign today. A trustworthy installer should give you time to review the contract, answer questions in writing and provide references from nearby customers. Checking online reviews and your state's contractor licensing records is also worth a few minutes. Taking an extra week to compare can help you avoid a decision you'll be living with for a long time.