PVWatts

Source: 
United States National Renewable Energy Laboratory

PVWatts is a web-based tool that calculates electrical energy production and cost savings of grid-connected photovoltaic energy systems. The PVWatts calculator is available in two versions. Version 1 allows users to select a location from a map or text list of pre-determined locations throughout the world. Version 2 allows users to select any location in the United States.

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Technology and Application: Solar Power