Roof Mounting and Ground Mounting
The two most common system installations in the solar industry are roof mounting installations and ground mounting installations. You could find roof mounting installations mostly in residential places due to lot size, the array space on the ground may be limited. Also, roof mounted arrays are a lot more aesthetic looking and safe (due to accidental contact with energized components).
Ground mounted systems are more common for commercial systems. Ground mounted systems are more time consuming then the roof mounting systems due to the larger support system.
For roof mounting, you have to make sure that you have installed a fire-rated roofing product on your roof, the roofing products you should use may be different depending your local code requirements. An example of a fire rated product would be asphalt shingles. Depending on your roof type and system design due to spacing you can choose to put your panels portrait (vertical) or landscape (horizontal) orientation. There are three different ways of securing your panels to the roof deck:
- Mounts directly to the roof
- Modest looking
- Subject to lowest wind loads
- Limited circulation of air beneath the panels, increases panel temperature while decreasing the output
- Commonly used in flat roofs
- Designed to match the desired tilt angle
- Supplied with or without an adjustable tilt
- Secure the panels using triangular support
- Greatest degree in air circulation
- Subject to greatest wind loads
- If installed improperly may cause shading therefore, reducing or even preventing system output voltages
- The most common type of mounting systems for sloped roofs
- These systems provide 3-5 inches of space between the panels and the roof, which is great for air circulation while minimizing the wind loads.
DID YOU KNOW?
The first solar cells built in 1950s had efficiency of 4%! Today’s technology in solar cells has the efficiency of 25%!!!