For example, a home in Los Angeles with a roof size of 1,352 square feet that uses 1,954 KWh/month will probably need a 13.53 kwh solar power system. Before factoring in available credits/incentives, the system will cost $94,688. In this example, the post-incentive cost is $9,213. Incentives for this system consist of the federal tax credit of 30 percent, a property tax exemption from the state and a rebate of $0.12/kwh for 20 years from the city of Los Angeles. The breakeven point is 3.64 years  where the savings equal the initial investment.