The cost of solar panel installation in San Bernardino County, California varies depending on factors such as the size of the solar system, roof condition, energy consumption, and installation requirements. On average, homeowners can expect to invest between $10,000 and $25,000 or more for a residential solar energy system. Federal tax incentives may reduce the overall cost by 30% or more, making solar power more affordable for many households. Additional factors, including roof type, system design, installation complexity, battery storage options, and energy efficiency goals, can influence the final price. While the upfront investment can be significant, solar panels often help reduce long-term electricity costs and may increase the overall value of a property.