Companies that supply strong warranties, which include People for workmanship, tools, and power output that safeguard the solar systems they set up towards possible damages rating extremely within our system. ADT Solar — previously Sunpro — manages to barely eke out SunPower as our decide on for best warranty protection. https://www.scribd.com/document/673539522/4-Tips-to-Check-Before-Hiring-Solar-Installers