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A fresh investigation by IEA PVPS Task 15, appearing in Energy & Buildings, takes aim at a long-standing assumption in the building-integrated photovoltaics field: that arrays mounted on rooftops at optimal tilt angles represent the gold standard against which all other BIPV setups must be measured, and that vertical facade installations amount to little more than a concession.
The paper, called Multi-objective assessment of BIPV yield, complementarity, and economic feasibility, examines the circumstances under which BIPV genuinely delivers returns and what facade orientation decisions truly cost in terms of surface area. It offers one of the largest comparative datasets compiled on building-integrated photovoltaics, encompassing 357 design configurations.
A standardized BIPV module measuring one square meter was constructed by the researchers, who then conducted simulations spanning 44 cities across 12 countries on six continents, yielding the 357 configurations examined. Instead of settling on a single optimal angular setup for each city, the team explored a wide range of tilts and orientations across eight BIPV application categories: continuous and discontinuous roofs, skylights, curtain walls, rainscreens, double-skin facades, balustrades, and shading devices. These were combined with efficiencies covering the current commercial spectrum.
As anticipated, rooftop BIPV installations reach peak output near solar noon. When east- and west-oriented vertical facades were modelled together with a rooftop system, employing a genetic algorithm to fine-tune azimuth for temporal alignment and smoothness rather than maximum output, a distinct pattern appeared. East-facing vertical BIPV produces earlier in the day, west-facing produces later, and merging both with a rooftop array substantially flattens the combined generation profile.
The authors present this as a legitimate design tool rather than a consolation for buildings lacking roof area. They characterize it as a means to lower ramp rates, enhance the match between solar generation and a building’s own consumption pattern, and reduce the strain that concentrated midday peaks impose on electrical grids.
Pursuing smoothness and complementarity does not exact a heavy toll on overall yield, the study indicates. Vertical facades need greater surface area than an optimally angled roof to produce equivalent electricity, yet the authors characterize the resulting area penalty as remaining within the reasonable building surface for most projects.
They further observe that optimizing for complementarity and smoothness hardly alters that area requirement relative to a system tuned solely for yield. The takeaway is that architects need not sacrifice either a stable, well-distributed generation profile or a reasonably compact footprint.
The study gently contests the standard design guideline that panel tilt ought to simply equal local latitude. Among the cities examined, the tilt yielding maximum annual output consistently diverged from this rule, especially at higher latitudes and in locations with considerable cloud cover or diffuse radiation, where flatter tilts gathered more sky and outperformed what the latitude-matched angle would predict.
For facade-integrated systems in particular, the researchers discovered that steep near-vertical tilts near 75 degrees regularly beat true vertical at 90 degrees for capturing irradiance close to solar noon. Fully vertical installations still ranked as strong runners-up, particularly at higher latitudes where the sun remains low in the sky for much of the year.
Numerous high-performing facade configurations did not face the equator. East- and west-facing surfaces demonstrated value for harvesting morning and afternoon sun, giving architects greater design latitude without a significant energy trade-off.
The paper’s sharpest criticism concerns how BIPV economics are handled. Standard net present value and levelized cost of energy computations systematically underrate BIPV, the authors contend, since they regard it purely as a power-generation asset akin to ground-mounted solar. This perspective overlooks that a BIPV skylight, curtain wall, or rainscreen simultaneously substitutes for a conventional, non-generating building material that the owner would have purchased anyway.
By constructing effective variants of net present value, levelized cost of energy, and payback period that give BIPV credit for this avoided material expense, the study concludes that BIPV viability is considerably more achievable than the technology’s expensive niche reputation suggests.
The paper additionally identifies a trend across application types that developers might intuit but seldom see measured. Double-skin facades and skylights reliably delivered the strongest economic results, specifically because they replace costly conventional materials, whereas shading devices trailed since the conventional alternative they substitute is relatively inexpensive. This disparity means identical module technology and pricing can appear economically appealing on one building component and marginal on another.
Among the report’s most striking conclusions is what genuinely propels BIPV economic performance over time. The correlation analysis identified electricity price growth as possessing the strongest link to long-term project value, exceeding the impact of electricity generation itself, the initial electricity price, or the cost of the BIPV product.
The sensitivity analysis supports this by demonstrating that no individual input variable determines outcomes alone, whether module cost, discount rate, or generation. Rather, it is the interplay among variables that decides whether a project proves viable, such as how long a system operates balanced against the material-replacement benefit it secures, or how electricity price trajectories interact with the discount rate applied to future savings.
The authors reach a straightforward conclusion: reducing BIPV product prices in isolation, without simultaneously tackling financing assumptions, installation costs, and local electricity market conditions, is unlikely to be enough to enable widespread adoption.
The authors take care to present their findings as comparative and scenario-based rather than predictive for any individual project. The model intentionally applies uniform assumptions concerning temperature coefficient, albedo, and loss factors across every application type and city to maintain consistency in the cross-regional comparison.
Consequently, it does not account for real-world factors such as rear-ventilation conditions, self-shading among building elements, or mounting-specific thermal behaviour that would vary significantly between, for instance, a rainscreen and a curtain wall.
The paper explicitly positions itself as a macro-level screening instrument for early investment choices and policy formulation, urging future research that incorporates application-specific detail. It also advocates for improved international coordination in sharing BIPV cost data, contending that fragmented, city-specific datasets have impeded precisely the kind of cross-regional evidence base this study seeks to establish.
The article was written by Ignacio Landivar and is part of a monthly column contributed by IEA PVPS Task 15, which concentrates on enabling frameworks for BIPV development. The third phase of Task 15, extending activities for four years, commenced in 2024. Involvement in Task 15 is offered as one avenue for influencing BIPV standardization without formal membership on a standardization committee.
Interactive table based on the Store Companies dataset for this report.
This report provides an in-depth analysis of the Solar Panels market in the World, including market size, structure, key trends, and forecast. The study highlights demand drivers, supply constraints, and competitive dynamics across the value chain.
The analysis is designed for manufacturers, distributors, investors, and advisors who require a consistent, data-driven view of market dynamics and a transparent analytical definition of the product scope.
This report covers photovoltaic (PV) solar panels, which are devices that convert sunlight directly into electricity. It encompasses the global market for finished modules, including all major product technologies and form factors designed for a wide range of end-use applications.
The market data is classified and analyzed according to international trade codes, primarily under the Harmonized System (HS) headings for photovoltaic cells and electric generating sets. This ensures consistent tracking of trade flows for assembled solar modules and relevant apparatus across global markets.
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Historic leader, now smaller scale
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Former industry leader, still significant
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