There's a (relatively) new website made for those folks who like to keep up with all the PV solar installations across the U.S. It is a part of the National Renewable Energy Laboratory's Website (openpv.nrel.gov) and there you can find a dynamic time map showing installation activity from 1998 to 2009.

In addition, you can see graphs on the number of PV installations, cost and capacity over time in any State or even ZIP code, using the so called "PV Market Mapper."

The Open PV database is the brainchild of geographers in the Data Analysis and Visualization Group within the Strategic Energy Analysis Center at NREL. So far, it has catalogued more than 64,000 systems with a total capacity of about 733 MW, and it doesn't surprise that it has been embraced by the two largest solar trade groups – the Solar Energy Industries Association and the Solar Electric Power Association, both of which are encouraging their members to use the maps and graphs as tools to grow their businesses.

Finally, there's an option for those who want to contribute data via the "Share Data" page.

[Via: NREL]