In California, installers are needed to have both a standard contractors license or possibly a C-46 Solar Contractors License. This license addresses installations for photovoltaic systems, solar drinking water and Area heating, and solar pool heating. Tesla gives all four major funding alternatives: cash, financial loans, leases, and PPAs. Leases https://solarpanelinstockton.blogspot.com/2025/07/how-american-array-solar-helps.html