Tuesday, June 25, 2024

Edge passivation improves shingled photo voltaic module efficiency – pv journal Worldwide


A bunch of scientists from Germany’s Fraunhofer ISE has proposed a brand new metric to judge the efficiency of shingled photo voltaic panels. They additionally utilized the so-called passivated edge expertise (PET) to experimental shingled modules and located that it might enhance their pseudo fill issue with out compromising their interconnection high quality.

Researchers at Germany’s Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE) are testing the referred to as passivated edge expertise (PET) of shingled photo voltaic cells and located that it could actually enhance their pseudo-fill issue (pFF) with out compromising the standard of their interconnection.

Shingle panels have a busbar-free construction the place solely a small portion of the cells are usually not uncovered to daylight. The cells are bonded with electrically conductive adhesive to type a shingled high-density string and the ensuing strips are related. Reducing the variety of busbars reduces shadow losses.

The scientists defined that the fill issue is a “questionable” parameter for evaluating the efficiency of small format shingle modules with and with out edge passivation, as a result of it is extremely delicate to present mismatch. The pFF, quite the opposite, reveals the saturation currents and parallel resistance and, in response to the analysis group, helps to quantify the fill issue losses on the module stage.

on paper”Investigating the impact of edge passivation on shingle photo voltaic modules,” revealed in Solar Energy Materials and Solar Cellsthe group stated that their work is primarily meant to analyze the implications of the so-called passivated edge expertise (PET) in experimental knowledge collected on the module stage from prototype manufacturing.

The PET expertise was developed by Fraunhofer ISE itself and consists of of passivating the lower edges of the shingles by depositing a dielectric layer after photo voltaic cell separation. The German institute filed a patent software again in 2018 and is providing a sampling of the expertise for companions. Solaria was one of many first business companions to check post-metallization PET in TOPCon shingle photo voltaic cells.

Fraunhofer ISE researchers used Python software program to conduct a collection of simulations on six small-format modules with 14 rectangular-shaped heart shingles to examine whether or not the pFF parameter is a “affordable” amount to judge. the impact of PET on shingle modules. “This is meant to be carried out on the proof-of-concept stage, that means that relative variations in pFF are thought of extra essential than absolute values,” they defined.

The efficiency of the modules can be in comparison with reference panels with out edge passivation. “At the proof-of-concept stage, simulations of shingle strings with and with out edge passivation present that pFF is an appropriate amount to evaluate edge recombination inside shingle photo voltaic modules, as it’s largely unaffected by present mismatch results,” the teachers acknowledged. “For very best strings, pFF linearly correlates with peak energy.”

They additionally discovered that the modules designed with the PET technique supply a pFF of about 0.5% increased than the reference panels. “This determine is in step with the rise in pFF discovered on the shingle stage, when contemplating the median values,” they concluded. “At the identical time, the PET course of utilized on this work doesn’t contain a big compromise within the high quality of the interconnection.”

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