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The National Renewable Energy Laboratory (NREL) developed a tool called PVWatts for the purpose of estimating the energy production and cost of energy of grid-connected PV energy systems for any address in the world. It allows homeowners, small building owners, installers, and manufacturers to easily develop estimates of the performance of potential PV installations, and can even compare solar’s cost to utility bills. These tools are great for getting started. But call Solar DC Power   for a free consultation and a custom estimate of the cost, and how much power your solar energy system is likely to generate.