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For residential, commercial and municipal solar projects, roof-top solar often provides the lowest cost per watt of installed capacity. Roof-top solar installations are also considerably faster than ground-mounted, as no geotechnical soil investigation is required, while structural engineering is straightforward in most cases. The speed of installation makes roof-top ideal for small-scale projects.
A combination of several factors determine the roof-top solar system sizing:
As the roof orientation and roof tilt dictates the orientation of the solar array, it is important to understand how much of the roof-top solar energy is produced under the given roof constrains as a percentage of the ideal South azimuth and ideal tilt. The table below shows Edmonton, Alberta losses compared to the optimal conditions:
When budgeting for the roof-top solar systems operations and maintenance, take into account the age of the roof. Additional expenses required for dismounting of the solar array during roof repair or replacement may outweigh the economical benefits for the roof-top solar PV installation. Also, the building economic life has to be long enough for the solar to pay-off.
Roof-top solar systems vary by the type of racking used to attach solar array to a structure.
Pitched solar systems have stand-offs screwed through the roof, typically into the rafters, or stand-offs are attached to the metal roof ribs.
Ballasted racking systems are installed on flat roofs or roofs with less than 5 degrees tilt. The racking helps to tilt modules towards the sun and concrete ballasts are used to hold the racking in place. Often, ballasted roof-top solar systems do not require roof penetrations.
Wall-mounted awning systems provide the benefit of an easy installation combined with steeper and optimal array tilts.