BIPV

A French-Italian research group has shown that BIPV facades on buildings can cause a ‘darkening’ effect by reducing light reflectance on nearby installations, dragging down energy production by 11%. The ‘urban heat island effect’ can also weigh on PV system performance, the researchers said.

European scientists have developed mini modules with an active area of 14 cm² and a 3.68% efficiency rating. The panels also have a self-adjusting feature that can help to mitigate the amount of light when they are exposed to full sunlight, or to the temperatures of buildings with large windows and/or glass facades.

U.K. business Roof Tiles Technology Ltd has developed a solar tile with a claimed efficiency of 17.5% and power output of 175 W per square meter. The company’s founder, Antonio Lanzoni, said a PV system featuring the product would cost 25-30% more than a standard solar rooftop.

German panel maker Sonnenstromfabrik has developed a glass-glass monocrystalline PV module in three versions offering different levels of transparency. The company says the transparency feature makes the panels suitable for verandas, pergolas, awnings, carports, swimming pools, halls and facades. Their power output varies from 160 W to 280 W, while their efficiency ranges from 9.5% to 16.7%.

Japan’s Kaneka and Taisei have designed their T-Green Multi Solar system to be integrated into walls and window surfaces. The system is available in two different versions – a solid type in which PV laminates are turned into vertical exterior panels or walls, and a variant that achieves transparency through striped solar cells that are integrated into window glass.

In a recent conversation with pv magazine Roland Valckenborg, business developer and project manager at the Netherlands Organisation for Applied Scientific Research (TNO), has described the results of a multi-year testing program for colored BIPV modules. Just a few years ago, it it was thought that power yield could be up to 50% lower than conventional panels, but tests have shown a difference of just 10%. Valckenborg says that losses can vary depending on the color of a panel.

French organic PV module manufacturer Armor said it began manufacturing free-form PV modules in early April. The new technology will allow the company’s ASCA PV film to be produced in a range of different shapes.

The building-integrated PV devices have taken a big leap forward on the back of a partnership between Australian scientists and a major glass manufacturer which will investigate the use of semi-transparent solar cells in commercial applications, potentially revolutionizing building design.

Taiwanese manufacturer Heliartec Solutions is offering BIPV panels for building facades that can be designed to mimic different kinds of textures in conventional building materials. The panels can also work as colored laminated safety glass and replace traditional cladding in the ventilated facades of buildings. They vary in length from 60 cm to 240 cm, with widths ranging from 30 cm to 120 cm. Depending on their size, the panels can offer power outputs of 90 W to 150 W per square meter.  

The lure of building integrated photovoltaics continues to attract entrepreneurs and startups.