A Solar Reference: Tilt and Direction

How Does The Orientation of my Roof Affect Solar Production?

Two important factors that can determine the efficiency of your solar energy system is the tilt (angle of the panels) and the orientation (direction – north, south, east or west).   To make sure that you’re getting the most out of your panels, they need to be pointed in the direction that captures the most sunlight.  Solar panels should always be faced south, unless you are in the southern hemisphere where they need to be faced north. The solar panel tilt varies depending on location.

Below is a Graph that shows the Efficiency of a Solar Panel at differing Orientations:

A Perfect World:
The green arrow points to the center part of the chart which is 100% insolation.  If you follow the grey line to the left you can see that at 100% insolation there is a 35 degree tilt.  Additionally, if you follow the line down you will see a direction of 180 degrees (true south).  After looking at this chart you can see that in Bridgeport, Connecticut you would need a 35 degree tilt and a roof facing true south to get the most out of your solar panels.

In An Imperfect World:

Most roofs are not perfectly positioned for solar panels.  They don't have to be perfect to benefit from solar energy.  Typically anything above an 80% Tilt-Orientation factor is good.  

For example, If you live in Bridgeport, Ct and you only have a 15° tilt on your roof and it faces South Southeast you can still reach a 95% Tilt-Orientation factor.

Questions?  Contact PurePoint Energy for your solar needs.  www.purepointenergy.com