Access Energy Cooperative - Check out the PV Watts calculator! It was created by the National Renewable Energy Laboratory (NREL), and is an unbiased tool that helps you make smart solar decisions
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Have officially had my 7.4kw system running for 1 year in Colorado Springs, CO, measured actual output vs the NREL calculator I did before system was installed (put in some EXACT numbers)
Resource Center – CED GREENTECH
How to use NREL's PV Watts Solar Calculator - YouTube
How to Use NREL's PVWatts Solar System Calculator | EnergySage
PVWatts at 20: Measuring Success in Megawatts and by the Millions | News | NREL