Your roof should be in good condition before installing solar panels. If your roof is old and in poor shape, it may need to be replaced before panels can be mounted. Additionally, your roof should receive a lot of sun to make the most of a rooftop system. Consider how much sun (and shade) the roof receives and if any trees will need to be removed. Solar panels perform best when facing south, so keep this in mind as you think about where the panels will be mounted. Visit the PV Watts Website for a free online calculator provided by the National Renewable Energy Laboratory that can help homeowners develop estimates of the performance of potential solar installations.
