There is a federal tax credit available to everyone who goes solar. As of 2019, it covers 30% of your entire project cost and you credit it to your taxes owed for the following year. However, this credit is reducing to 26% for 2020 and then to 22% in 2021. After that, it will be completely phased out. In California, there is a state-rebate program for batteries only, not panels. However, the funds have been depleted from this battery rebate program (Self Generation Incentive Program) and there is now a waitlist for SDG&E and Edison customers. The funds will be replenished in 2020, but at an amount that is to be determined.