State Availability: Although we only regarded companies that work in California for this assessment, installers gained much more points for using a service spot that addresses various U.S. states. Inquire whether or not the folks developing and setting up your system hold a related credential, for instance a NABCEP certification, https://www.americanarraysolar.com/4-things-to-see-when-hiring-solar-installers-in-california-in-a-budget/