I'm not aware of any solar tax credit on a CA tax return. The 30% credit that you read about is on the federal return.
They do have some rebate programs and incentives, but I haven't seen any credits that are taken on the tax return itself.
https://solartechonline.com/blog/california-solar-tax-credit/
♪♫•*¨*•.¸¸♥Lisa♥ ¸¸.•*¨*•♫♪
