PVWATTS v. 1 can be used for locations accessible through links on the map below, or through a text list for U.S. sites; or for sites outside the US, through text lists by region. Researchers at the National Renewable Energy Laboratory developed PVWATTS to permit non-experts to quickly obtain performance estimates for grid-connected PV systems.
Also available is an option to output hourly performance data. This option can be run after the inital calculation, and outputs the data in a separate browser window. Instructions for saving the output to a text file can be accessed through the “Help” link at the top of the hourly output page.
click on the link above (PVWATTS logo) to connect to the entire web site and articles
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PVWatts calculator for Madison Wisconsin
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