PVWatts Grid Data Calculator

MDI Sunspot Oct 2003

Here’s another solar calculator from National Renewable Energy Laboratory called PVWatts Grid Data Calculator.  This revised calculator uses monthly weather data and a PV performance model to estimate yearly energy production and cost savings on a typical crystalline silicon PV system installed.

This calculator is a little more geeky than others listed here so you’ll probably have to click the “help” links. After you choose a city you can click on “Explain This Result” and the view help page will hopefully help you understand the results:

Here’s the PVWatts Version 2 U.S. States Calculator-Viewer.

PVWatts Viewer Help Page.

* Sun image courtesy of SOHO (ESA & NASA)

PVWatts Grid Data Calculator