Introduction to NREL's PVWatts Calculator | NREL's PVWatts Calculator is a web-based application that estimates the energy production and cost of energy of grid-connected solar energy systems... | By National Renewable Energy
How to Use NREL's PVWatts Solar System Calculator | EnergySage
PVWatts at 20: Measuring Success in Megawatts and by the Millions | News | NREL