Solar roofs, which integrate solar cells directly into roofing tiles, face significant challenges in cost and efficiency compared to traditional solar panels, hindering their widespread adoption. While some consumers dislike the appearance of conventional solar panels, solar roofs offer an aesthetic alternative, particularly for historic buildings where appearance regulations are strict.
However, the economics and practicality of solar roofs remain a hurdle. Companies like Solar Service of Colorado, represented by operations manager Kate Collardson, find that the custom nature of each roof installation, coupled with complex building regulations, significantly increases time and cost. Collardson notes that repair costs for solar shingles are higher than for standard photovoltaic (PV) setups due to the lack of easily accessible electronics and mapping systems.
Efficiency is another major drawback. Solar roof tiles are typically smaller than standard solar panels, and their close proximity to the roof surface reduces airflow, leading to heat buildup that impairs performance. Colored tiles are even less efficient, as black is the optimal color for absorbing solar energy. This means more roof space is needed to generate the same amount of electricity as a standard system.
Despite these issues, companies like Freesuns, led by CEO Deborah Learoyd, are optimistic. Freesuns has seen sales grow and is exploring expansion into the US market. They are early adopters of matrix shingling technology, which connects solar cells in strips that allow electrical current to flow around shaded areas, improving both efficiency and appearance by hiding silver wires. This technology also allows for more flexible sizing of tiles.
Supporters, such as Martin Heinrich from the Fraunhofer Institute, argue that solar roofs should be viewed as a way to utilize roof space for electricity generation rather than directly competing with standard solar modules. While companies like Sunsave, co-founded by Ben Graves, do not offer solar roofs due to cost concerns among UK consumers, the potential for integrated solar technology remains a focus for future development.