http://pvwatts.nrel.gov/pvwatts.php

Quote: It allows homeowners,
small building owners, installers
to easily develop estimates
of the performance
of potential PV installations worldwide!!

Do try it and see your savings!!!

change the location for your own...

OK, without learning how to make a watch, just what is this telling me? It says 6700 watts per year for this part of South Texas, with an initial cost of $14,400. That's not very efficient when natural gas is cheap.