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What's the consideration when going roof solar

July 02 , 2018
When properly designed and installed, rooftop solar power systems are extremely reliable. But that requires several aspects to be considered in a good way. Solar mounting systems consist of a number of field-assembled parts and have to be integrated with existing roofing materials, as well as the underlying structural components of a house.

Anatomy of Solar Panel Mounting Systems
Importance of Reliable Solar Mounting Systems

A. Solar panels (also referred to as modules) convert sunlight to DC power. Solar cells are laminated behind tempered glass for durability and encased in a sturdy aluminum frame. These frames are designed so that panels, when properly mounted, can withstand the expected wind and snow loads that occur in a particular location.

B. Mounting clamps are generally aluminum brackets with stainless steel bolts that hold the solar panels securely against the underlying racking. Some mounting clamps also provide an electrical grounding path between the panel and underlying racking. Antaisolar provides the grounding clamp with a sharp point to penetrating the surface thus making it achieving electrical grounding.

C. Racking (often using a parallel metal rail structure) provides a level framework on the roof to which the solar panels are mounted. For cost and durability reasons, racking is typically fabricated from extruded aluminum. Antaisolar 's racking mostly uses anodized aluminum 6005 T6 and have different type to meet different requirements.

D. Mounts (also referred to as L-feet,you can click here (metal roof mounting system) read more about L-feet, standoffs or hangerbolt ) standoffs or hangerbolt ) attach the racking securely to the roof surface. Mounts vary depending on roof type and material; mounts are available for most common roof types including composition shingle, shake, slate, metal shingle, clay or concrete tile, low-slope (flat), and corrugated or standing seam metal. Mounts are generally available so that panels can be installed at different heights off of the roof, generally from about 1.5” to 12” (shorter mounts may provide better aesthetics but restrict air flow underneath the panels). Depending on the layout of the array, type of roof, wind load and size of racking, there may be one or two mounts for each panel. For example, a 20- panel array (about 5 kW) will typically require 25 to 40 mounts. Mounts are attached to the racking above with stainless steel bolts and the rafters below the roof surface with lag bolts.

E. Flashings provide a water-resistant seal between the mounts and roof surface. The basic function of a flashing is to redirect any water that leaks through or around the mount or fastener to a sheet of durable metal, thereby preventing the water from leaking through to the underlying roof decking.

F. Direct current (DC) wiring (for string inverters) uses positive and negative wires from each panel connected to the wires on adjacent panels. A “home run” wire is connected from the last panel in the string to complete the circuit. All wires must be secured to the racking or panels so that they do not hang down or rest on the roof surface.

G. Alternating current (AC) wiring (for microinverters and AC modules) uses AC cables (trunk cables or daisy chain cables) connecting each microinverter to adjacent microinverters. Cables must be secured to the racking or panels so that they do not hang down or rest on the roof surface.

H. Microinverters (for AC systems only) on some rooftop systems mount to the back of or underneath each panel to convert from DC current directly from the panel to household AC current.

I. Grounding components minimize electrical shock hazards. Every conductive metal component in an array that is likely to be energized in the event of an accidental fault must be securely grounded. Generally, small accessories such as mounts, flashings and clips do not need to be separately grounded.


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