NREL PVWatts Energy and Cost Savings Calculator
Friday, February 25th, 2011The National Renewable Energy Laboratory (NREL) developed the PVWatts map and calculator tools to give non-experts access to solar radiation data and estimates for grid-tied photovoltaic systems in the 48 contiguous U.S. states, Alaska and Hawaii. Users click on the map or type in an address to display the amount of sunlight that falls on a square meter at that location over the course of a year, as well as the local cost of electricity. After identifying a location the user can export the data to the PVWatts Cost Savings Calculator.

The Calculator takes a PV system size, the cost of electricity and the location’s exposure to solar radiation to calculate system efficiency, monthly and yearly cost savings.

