Building Integrated Photovoltaic (BIPV) System Testing and ...

20 May.,2024

 

Building Integrated Photovoltaic (BIPV) System Testing and ...

The increasing popularity of building integrated photovoltaic systems

As solar photovoltaic (PV) technology matures it is increasingly being integrated into building construction and used to replace conventional materials in parts of the building envelope such as roofs, curtain walls, and windows. As conventional roof installations continue to increase and PV prices decrease, Building Integrated Photovoltaics (BIPV) are gaining popularity. Architects are now integrating the technology into their designs for the aesthetic value while helping building owners save on their cost of electricity with environmentally friendly generation. Furthermore, BIPV is a means to achieve compliance with energy conservation and sustainability requirements and helps in achieving a Leadership in Energy and Environmental Design (LEED) Building certification.

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What is BIPV?

BIPV are products incorporating photovoltaic modules that also function as a component of the building envelope, and have been designed for both the basic requirements for both photovoltaic products and construction materials they are intended to replace. BIPV products are intended for mounting integrally to the structure or protective surfaces of a building in one of two primary installation methods:

  • to serve as the roof, or as a major component of the roofing system of a building
  • to serve as part of a structural or non-structural component of a building, such as a curtain wall, facade, atrium, or skylight.

BIPV systems compliance to various safety standards 

Currently, BIPV systems and their mounting means for roofing systems are evaluated separately for compliance to:

  • UL 7103, the Outline of Investigation for Building-Integrated Photovoltaic Roof Coverings
  • UL 61730-1, the Standard for Photovoltaic (PV) Module Safety Qualification - Part 1: Requirements for Construction
  • UL 61730-2, the Standard for Photovoltaic (PV) Module Safety Qualification - Part 2: Requirements for Testing
  • UL 790, the Standard for Flat-Plate Photovoltaic Modules and Panels
  • UL 580, the Standard for Tests for Uplift Resistance of Roof Assemblies

The safety evaluation includes electrical, temperature, mechanical loading, wind resistance, impact and fire tests. The product’s output wiring system is also investigated for conformance with the provisions of the National Electrical Code (NEC). Having one standard (UL 7103) to address all aspects of concern – electrical, fire, wind resistance, weather protection, impact resistance and durability – of this new type of building material makes it far easier to demonstrate code compliance.

Safety certification for BIPV products is more stringent than for conventional PV modules

The National Electrical Code (NEC), International Building Code (IBC) and International Residential Code (IRC) require that all PV products that are intended to be installed on or around a building must be certified by a Nationally Recognized Testing Laboratory (NRTL). Because of these Code requirements, all BIPV products are subjected to the same electrical certification and safety testing standards as conventional PV modules and more.

Product installation concerns for PV panel systems include:

  • Utility compatibility and interaction
  • Environment (e.g., indoor, outdoor, hazardous location)
  • Maximum number of modules (affecting voltage/current/short-circuit)
  • Fire exposure ratings
  • Wind and snow loading
  • Mounting and attachment
  • Grounding and bonding
  • Shading

Since some BIPV are designed to directly replace roofing material, a BIPV system must be evaluated not only as a PV module but also as a roofing material with additional Code required testing such as:

  • Fire testing *
  • Impact testing
  • Wind resistance
  • Wind driven rain
  • Environmental testing for conditions like:
    • Temperature
    • Humidity

Why UL Solutions for building integrated photovoltaic (BIPV) system testing and certification

Integration of PV systems into building products and architectural designs is growing. UL Solutions' safety science leadership, regulatory expertise and experience in the building and solar industries uniquely position us as the partner of choice for testing and certification of BIPV products into the building envelope.

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* The fire testing includes those tests performed under the Solar PV Module safety standard (UL 61703) and additional tests that are normally applied to roofing materials (UL 790).

Building-integrated photovoltaics: The A to Z of BIPV systems

Construction is a strong contributor to climate change, with the construction sector accounting for 38% of global carbon emissions.

And as CO2 emissions from building operations reached an all-time high of around 10 GtCO2 in 2021 – a 5% increase compared to 2020 – it’s clear that the construction industry needs a greener method to combat climate change while also keeping up with the demand from a growing population.

That’s where building-integrated photovoltaics (BIPV) can help. BIPV is a form of solar system that can be used as a conventional functional part of a building while also generating electricity from solar energy.

BIPV can substitute traditional construction elements, such as roofs, façades, and skylights – an exciting development to seamlessly incorporate solar photovoltaics into modern architectural structures.

BIPV systems have already been incorporated into a wide variety of buildings all around the world. From the iconic Copenhagen International School in Denmark – whose 700 kW BIPV systems power 50% of the school’s total annual electricity consumption – to the impressive Solar Ark building in Japan. The Solar Ark’s BIPV systems generate 630 kW from over 5,000 solar panels, totaling around 500,000 kWh of energy per year.

With the global BIPV market rising to a value of roughly $10.8 billion in 2022, it’s clear that BIPV are here to stay, with more and more people looking to green solutions for energy generation over time.

In this article, we will discuss the differences between BIPV and regular PV systems, the different forms you can find BIPV in, the advantages of BIPV, as well as some real-life examples of BIPV systems around the world.

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