It also depends where you got your quotes and estimates. Retail sales reps are a complete disservice to the industry, often quoting double what an installation

It also depends where you got your quotes and estimates. Retail sales reps are a complete disservice to the industry, often quoting double what an installation _should_ cost. I highly recommend EnergySage for quotes. It's free and unbiased for sourcing local installers while skipping the sales reps. And do keep in mind warranties cover 90% efficiency on panels and they'll continue working beyond warranty at reduced capacity.