01/26/2021
Thinking about solar? Understanding what factors affect a solar systemâs performance is important when considering an installation. Here are 6 factors to consider before installing a rooftop solar installation! Authored by Danielle Kvadas ()
1. Roof Quality
Before installing solar panels, the quality of the existing roof should be assessed. Most roofs last about 20 years but if the roof is due for a replacement, the replacement should be completed first. Solar being installed on a roof that is less than 15 years old is ideal. Installing panels on a roof that needs to be repaired will only result in excess money spent on the removal and reinstallation of the system.
2. Roof Pitch
The pitch of a roof can affect the production of a solar system. Typically, pitches between 30-45 degrees work well, although most tilts within range will produce sufficient production.
3. Azimuth
Both south and west facing roofs tend to be the best orientation for solar systems in the northern hemisphere. Like pitch, the azimuth will also affect the amount of energy produced by solar panels.
4. Shading
Trees, rooftop obstructions, and cloudy days typically result in a less efficient system. Given that panels are powered by the sun, shading would affect the overall solar systemâs performance. Thus, depending on the components of the solar system (string inverter vs. microinverters), some systemâs production can be impacted greatly by shading.
5. Obstructions
Rooftop obstructions may be a critical obstacle in system design. Obstructions can vary from pipes to chimneys and skylights. Depending on the height and width of the obstructions, shading severity can vary. Aside from shading concerns, obstructions also restrict the system design. An aesthetically pleasing system design might be unachievable if the obstructions are permanent or unable to be moved.
6. Setbacks
Different codes require different setbacks to be implemented on solar system designs. For example, the fire code requires a three-foot setback from the ridgeline and sides of the roof plane. Codes may vary under which jurisdiction has authority and are continually changing. If there is already a lack of roof space, system design will be affected.