With enough roof space, your building may be able to support a solar photovoltaic (PV) system that completely offsets your monthly electricity bill. It is even possible to generate more electricity than your business needs, at which point you can net meter your system and sell your power back to the grid. But, how can you determine if your roof is suitable for solar? And how large a system can your roof support? Our new Capacity Calculator is the first step in helping you to envision a future where your roof is helping your bottom line by generating clean, renewable power. A full site visit and study will need to occur to gain a more accurate understanding, but here are some of the factors determining your system’s capacity.

  1. Roof size

Simply enough, a larger roof can support a larger system, and therefore generate greater electricity. A 125,000 square foot roof, for example, will, on average, support a 1 megawatt (MW) solar PV system.

  1. Orientation

A south-facing roof (or south facing panels installed on a flat roof) is ideal. Panels can be positioned to face west, as well, though this will likely come with diminished productivity.

  1. Panel tilt

Panel orientation and tilt are the two most important factors in determing system productivity. A roof-mounted solar PV system will typically be angled between 5 and 15 degrees.

  1. Shading

As part of system design, a shade study is completed in order to determine where the building is shaded during peak production hours (10 AM – 2 PM). HVAC equipment and neighboring buildings are some of the most frequent shade producers that will impact productivity.


What are you waiting for? Check out the Capacity Calculator and contact us to get started on your new solar PV project.