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Energética India | September / October 2015

RENEWABLE ENERGY ENERGETICA INDIA From Energetica India’s Blog Stable; Sep/Oct 2015 Energetica India brings forward the work of bloggers and contributors associated with Energetica India. The article collates thoughts/ideas/concepts based on the writers’ industry experience. MR. SESHADRI AKELLA MANAGING DIRECTOR OF DAKSHESH ENERGY PVT LTD Solar PV Panel vs Cell Manufacturing in India The solar PV panel manufacturing opportunity, especially the crystalline silicon variety, was the best thing to have happened for Indian businessmen interested in solar PV, for it gave them a chance to participate in the electronic hardware manufacturing boom which India is going to witness over the next few years. Strategically speaking, it had exciting but surmountable challenges and the scope to become a mature and stable industry in India and pose a threat to even top Tier 1 foreign vendors offering similar products. This was a long drawn patience game and the issue of Chinese onslaught of cheaper Tier 2 but not so reliable panels could have been overcome gradually, as more and more developers recognized the importance of reliability. The challenges lay in 1. Selecting the right kind and right quality of raw materials and the Bill of Materials(BOM),be it the encapsulant (ionomer vs traditional EVA), the backsheet (traditional TPT varieties vs Aluminium foil),glass to glass panels, interconnects(leaded vs non-leaded, copper vs Aluminium),cells(front contact vs back contact, PERC, p-type Cz mono and multi vs ntype Cz mono substrates, thicker vs thinner cell thickness),glass (plain vs textured) 2. Selecting the right kind of manufacturing process suitable for the raw materials. For example, the type of soldering for tabbing-stringing(based on type of interconnect, importance of automation for soldering, for this is one critical process where micro-cracks can be induced),adjusting the lamination cycle based on type of laminate, importance of AAA simulator instead of AAB or BBB types, checking suitability of flash vs steady state simulation 3. Selecting the right kind of inspection tools and techniques, understanding the various possible module and cell defect and failure mechanisms, and developing suitable vendor,in-process and product quality checks using the right equipmen t(PL,EL,thermograph,laser scan,interferometry,RUV etc) in the right places, if required at the project site as well. Striving to go beyond than be content with the run-of-the-mill UL and IEC product certifications, which most vendors ‘claim’ to have, which really do not mean much 4. Selecting the right kind of packing materials for packing the panels so that they do not get damaged during container movement during transportation, loading and unloading and do not get wet when unloaded and stored in the open at the project site. This is critical to ensure that no microcracks are induced in the panel cells during this stage 5. Setting up a State-ofthe Art reliability testing lab with a large outdoor space to test various possible BOM and inverter combinations in the field under carefully controlled conditions Unfortunately, I saw this opportunity frittered away in most cases. I never frankly thought India was as yet ready for solar PV crystalline silicon cell manufacturing as an industry which can be set up and stabilized as easily as a solar PV panel manufacturing unit, given the nature, type and extent of logistics, quality of raw materials and in-process quality checks required of the well-known but very arduous and sensitive manufacturing processes. Further, enormous resources were required to be pumped in to constantly upgrade the cell manufacturing processes (every day you hear some new process) and equipment and the attendant quality control equipment 66 energetica INDIA · SEP | OCT15


Energética India | September / October 2015
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