The cost of a solar energy system varies from home to home. It depends on many factors, and the most influential are: Your energy usage and how much you want to replace or offset. The degree of shading and obstacles. Where shading plays a role, and extra panel or two may be added to overcome the losses. The design and condition of your roof and the suitability to add solar to your home’s existing electrical system. For estimating, here is one example — An average system in our geographic location is designed with approximately 30 panels. Such a system will generate around 11,000 kwh/year and will cost between $32-$38,000 before the 26% federal tax credit is applied, or between $24-$28,000 after the tax credit. Please visit our more detailed explanation of solar electric costs.