PVWatts was updated on July 9th, 2015 to fix a problem that resulted in overprediction of system energy in fixed tilt systems with very high tilt angles and west or east facing azimuth orientations. The difference in predicted output for the vast majority of system configurations is well within the stated uncertainty of PVWatts (+/- 10%).
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Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations.
PVWatts® is a registered trademark by Alliance for Sustainable Energy, LLC in Golden, CO, 80401.