What is Rail Mounted Solar Systems and Rail-less Solar Systems?

 

There are two main mounting variations for rooftop solar - rail mounted and rail-less; the most widely used method being the rail mount.

Art Sign compares rail mounted and rail-less racking solutions available for residential shingle rooftops and identifies the pros and cons of each.

Art Sign offer a variety of rail mounting solutions that allow us to customize our system designs to best meet customer’s aesthetic and financial needs. However, we realize rail mounted solar isn't for everyone. So take a look at the comparison below.

Similarities Between Solar Racking with Rails and Without Rails

• They can be integrated when the roof is first installed or later after the roof is already on the house
• Roof warranties (if one exists) are typically not impacted by either mounting method
• Both should be installed by professionals - with proper installation the system will protect the rooftop and keep the roof watertight
• The price variation is a few cents per KW, a very small proportion of the overall system cost
• Both types integrate with inverters similarly

How Both Systems Work

Standard Rail Mounted Solar:

This method uses a flashing to attach onto the existing rooftop. The flashing is similar to what would be used for a standard roof vent. An “L” foot or support component is then fastened to this flashing and holds the aluminum/steel rail 2-4 inches above the rooftop, upon which the solar panels are mounted.

The Pros for Standard Rail Mounting:

• Can be used with almost any KW module in the colar of your choice
• Rails themselves are available in silver/black to blend with the rooftop if desired
• Many manufacturers offer flashing to help blend in with the rooftop and keep rodents out
• Conduit/wires can be run through the rooftop or across the rooftop
• Most manufacturers have been around for a long time and have long histories of success

The Cons for Standard Rail Mounting:

• Rails add additional weight to the roof which could mean older/less engineered buildings may not support the additional load
• The solar system is more prominently displayed as it sits several inches above the shingles
• When installed without flashing, equipment is more accessible to rodents/weather

Rail-less Mounted Solar:

This more of a low profile mounting method. Systems typically use multiple attachment points on the rooftop and attach to each panel individually, eliminating the need for rails.

The Pros of Rail-less Solar:

Sleeker, less noticeable design offered with flashing that helps blend the system in with the roof and keep rodents/weather out

Less weight on rooftop means it may be more compatible with older/less engineered buildings

Wires are contained beneath the array and hidden from view

The Cons of Rail-less Solar:

Limited to darker module types which are typically more expensive and not as highly rated in KW

• Wires and conduit must be run through the rooftop, leaving no option for conduit across the rooftop or down the side of the building
• Less common and newer products may mean a higher risk of problems during the install or long-term as well as the presence of fewer experienced installers
• There are fewer product manufacturers versus rail mounted system. Two of those brands are Deco Tech Roof Integrated Solar and Quick Mount PV

Picking Between Rail Mounts and Rail-less Mounts, please contact us for more detail.

Email: sales@artsign.net.cn Whatsapp/ Wechat/ Skype: +86 180 3023 5875