Check that your solar-energy installer has the proper licenses and insurance. Installing solar panels on a steep roof is a delicate job, and you should feel confident that your installers know what they are doing. At a minimum, look for a contracting license, workers compensation insurance, and general liability insurance.
Check into all of your potential rebates. You know there are rebates, correct? The government (in certain states) has a bunch of ways that they'll reward you for taking the solar energy plunge. And there are also benefits during tax season. Look into them all so you'll get every penny coming back to you.
This is a Solar Install i did on my Mobile Home. I worked on it for several months.
Solar panels must be cleaned regularly. If your home is in a filthy region or close to the desert, they should be hosed weekly. Regardless of air born dirt and dust, you should do a through cleaning every couple months. Clean solar panels are productive solar panels.