In California, installers are needed to have both a standard contractors license or maybe a C-forty six Solar Contractors License. This license addresses installations for photovoltaic systems, solar water and space heating, and solar pool heating. Other certifications you need to look out for, none of that are legally necessary https://solarinstallationcalifornia.video.blog/2025/09/14/commercial-solar-installation-dublin-power-your-business-sustainably/