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MANUFACTURINGMATERIALS


showed a comparative increase. Due to the higher light transmission of ETFE, PV cells experience an increased amount of light resulting in higher generated power output.


ETFE also provides superior weatherability and UV resistance, ideal for use in the design of flexible and lightweight solar modules. Tough and flexible, these highly transparent films – weighing as low as 0.1 kg/m2 – offer outstanding resistance to chemicals and weathering, low flammability, stress crack resistance, and insulating properties. ETFE films also work well when used in tandem with other film products, such high-quality EVA encapsulants.


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Chart 1: Efficiency increase of ETFE modules relative to glass modules, based on Isc


Strong Performance


The most important factor to consider in designing a product that end-users depend on for their energy needs is performance. Thin-film ETFE frontsheets help manufacturers design a lightweight PV module with concrete performance benefits throughout its product lifecycle, most importantly, excellent light transmission. More transparent than conventional materials, ETFE provides higher efficiency in frontsheet applications (chart 1). Comparing the efficiency of modules made with an ETFE with those made from glass, both the 2mil and 10mil ETFE covered modules


EVA encapsulants allow greater light transmission, superior adhesion to frontsheet and backsheet materials for both rigid and flexible modules, and strong electrical, mechanical, and weathering properties, providing long-lasting protection for solar cells (chart 2). An increased level of long- term weathering and UV protection is vital in extending the power-generating capabilities of any PV module exposed to the elements (charts 3-6).


Production efficiencies


In addition to product performance, design decisions can also have a positive impact on the manufacturing process. Efficient manufacturing resulting from increased production throughput can make a major difference in overall profitability. Design decisions regarding materials that make the best use of valuable resources, including


Chart 2: Typical properties of EVA


www.solar-pv-management.com Issue I 2011


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