25 degree solar power generation on a pitched roof

Should solar PV modules be mounted on a pitched roof?

Often, solar PV modules are mounted on pitched rooftops without considering the optimal tilt angle, but rather using a tilt angle equivalent to the pitch angle. This consideration affects the overall performance of the solar PV system resulting in lower solar energy yield.

What is the tilt angle of a solar panel?

The array’s tilt is the angle in degrees from horizontal. A flat roof has a 0-degree tilt and a vertical wall mount has a 90-degree tilt angle. Whether you are installing a solar panel on a flat roof or a pitched roof, the output of the solar PV system would be increased by optimizing the tilt angle.

What angle should solar panels be installed on a flat roof?

Most experts consider a 30-degree angle ideal for solar panels, which will likely require a stand to achieve such an angle with a low-sloped roof. The roof and solar panels may be less visible to passersby in a flat roof installation, providing an aesthetic bonus.

Does the slope of a roof affect solar energy output?

The slope of your roof isn’t as important as the orientation, but it can affect your solar energy output.

Does tilting solar panels increase energy output?

Results are shown in the graph below. Tilting the panels significantly increases energy output (read our article to find out solar panels power generation rate). The maximum output, at 30 degrees tilt, is 14% higher than the energy output of flat panels. Over the 25 year life of the panels, that’s a lot of energy.

Why do solar panels need a pitched roof?

Let’s explore the dynamics of this decision. Roof pitch plays an important role for solar panels, with pros and cons for flat roofs, low-sloped roofs and pitched roofs. A pitched roof can make it easier to achieve the optimum angle toward the sun without using stands. It also can provide for improved runoff of snow, rain and debris.