Straight cash, or however you like. It’s. Law to have solar in new homes even on ADU in Ca. Knock doors, call a friend, help someone complaining about bills. I’ve been doing this over ten years and can sell almost ANY home improvement. Solar costs them nothing to save money, everything else does. After first deal, your levels to completion earned will go UP with EACH ONE . Costs nothing to save money… even can do other states…