Our Team made a scoring system for solar businesses which allows us to rank and evaluate installers dependant on what’s most important to people. Other certifications you need to watch out for, none of which might be legally needed but make sure high quality, contain the following: NABCEP certification — https://californiasolarpanelinstallation.tech.blog/2025/08/23/best-solar-company-in-california-affordable-solar-installation/