If you're planning to buy Solar equipments and panels look for the UL seal
There are so many illegitimate and fly by night Solar installers. In the Solar convention at SMX there were many individuals who voiced out what to do when their installer have closed their business and need repairs, modifications or maintenance. Many just shrugged their shoulders and accept their faith. They have been sold a very expensive system and now it's inoperable and useless.
So if you're in the market and looking for legit designer, installation and maintenance of your Solar power system make sure they have the proper licenses and they only sell equipments with the UL seal as shared to me.