Solar Panels South Facing Roof

Even with this decrease in performance solar panels will produce enough electricity to save you hundreds of dollars a year.

Solar panels south facing roof.

To correct the compass reading your solar installer will calculate the magnetic declination of your site. Panels mounted on a standard pitch roof facing east or west will produce approximately 15 less output than panels mounted on a south facing roof of a standard pitch. Why orientation matters with rooftop solar. On a south facing roof the panels produce energy when the sun is high in the sky but as the evening sets in that production decreases.

We also took at look at a tilt angle of 40 for the south facing orientations mainly just to show that a south facing roof with a steep pitch is probably not a good place for solar panels. Solar south or geographic south. If the panels face west instead they get more energy during the afternoon an evening. You can add an extra panel if you have the room to make up the difference.

For the northern hemisphere south facing roofs will give you the best results from solar panels. Therefore directions like southwest or southeast are fine. In general solar panels that are oriented directly east or directly west will produce about 20 percent less electricity than if they were facing south. The closer to horizontal the better it will be for solar.

A littlle east or west causes no problems. The direction solar panels should face is true south a k a. True south can also be calculated at noon when shadows from vertical objects run north south. However solar panels can be orientated on any roof that faces south of either east or west.

The results backed us up on this theory showing poor solar radiation levels for south facing roofs at this steep tilt.