REI Mar-Apr 2012 - Renewable Energy Installer

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Knowledge: ET Solar From silicon to solar panel The manufacture of a solar panel is a thorough process which in the case of ET Solar involves over 200 stages of development and checks, says Jane Hughes EI was invited to see ET Solar’s R manufacturing process fi rst hand through ingot, wafer and cell to fi nished module at the company’s manufacturing plant in China. Modules are produced for commercial, residential and utility applications with 90 | www.renewableenergyinstaller.co.uk 4 projected capacity for <strong>2012</strong> year end being 800MW wafer, 1000MW cells and 1600MW of modules. The company’s solar panels feature integrated bypass diodes to protect the solar cell circuit from hot spots during partial shadowing. Anodised aluminium frames with 5 1 hexagon drainage holes have strong load resistance with grounding holes on four sides. Modules are fi nished in transparent, lowiron and tempered glass with anti-refl ective coating. A selection of the process stages are illustrated on these pages. 2 (1) The silicon which is sourced from Korea is heated to a melting point of 1420ºC using American equipment. (2) This solid block of melted silicon can produce 12,000 wafers. The block is fi rst made into 25 smaller blocks or ingots using a Swiss slicing machine. 3 (3) Each ingot is infra red scanned in a laboratory to check for impurities. (4) The provenance of each ingot can be tracked via its unique code. (5) The ingot undergoes a series of processes to smooth edges until a glass like fi nish is achieved. Continued on page 92
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REI Mar-Apr 2012 - Renewable Energy Installer

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