{"id":107,"date":"2019-11-08T14:51:03","date_gmt":"2019-11-08T14:51:03","guid":{"rendered":"https:\/\/solartechlab.wordpress.com\/?page_id=107"},"modified":"2020-03-17T12:15:03","modified_gmt":"2020-03-17T11:15:03","slug":"snail-trails-and-micro-cracks","status":"publish","type":"page","link":"http:\/\/www.solartech.polimi.it\/activities\/snail-trails-and-micro-cracks\/","title":{"rendered":"Snail trails and micro cracks"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-3\">\n<div class=\"wp-block-column is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"has-normal-font-size\">  Snail trails (snail tracks) are a product of the formation of silver carbonate nanoparticles which discolor the silver grid. Micro-cracks are instead due to\u00a0thermo-mechanical stress.<\/p>\n\n\n\n<p class=\"has-normal-font-size\">In the first activity (August 2013) and second activity (Summer 2015) the performances of modules\u00a0affected by &#8220;<strong>snail trails<\/strong>&#8221; and\/or &#8220;micro-cracks&#8221;\u00a0phenomena\u00a0are measured and compared to the expected production in order to determine the efficiency and incidental degradation phenomena.<\/p>\n\n\n\n<p class=\"has-normal-font-size\">Measurement of PV modules&#8217; I-V and P-V characteristics under actual environmental conditions, thermal analysis and power output analysis have been performed.<\/p>\n\n\n\n<p class=\"has-normal-font-size\">After completing the experimental measurements on affected PV modules we observed that daily energy production can be decreased by 30% when this phenomenon occurs.  <\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow\" style=\"flex-basis:40%\">\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/immagine7-1.png\"><img decoding=\"async\" loading=\"lazy\" src=\"http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/immagine7-1.png\" alt=\"\" class=\"wp-image-1036\" width=\"603\" height=\"491\" srcset=\"http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/immagine7-1.png 603w, http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/immagine7-1-300x244.png 300w\" sizes=\"(max-width: 603px) 100vw, 603px\" \/><\/a><\/figure>\n\n\n\n<p class=\"has-small-font-size\"> <em>Picture, thermal image, and Measured I\u2013V and P\u2013V curves of one PV modules affected by the snail trail phenomena in comparison with datasheet curve<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-background has-vivid-red-background-color has-vivid-red-color\"\/>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/mpp.png\"><img decoding=\"async\" loading=\"lazy\" src=\"http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/mpp.png\" alt=\"\" class=\"wp-image-1037\" width=\"400\" height=\"282\" srcset=\"http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/mpp.png 400w, http:\/\/www.solartech.polimi.it\/wp-content\/uploads\/2020\/03\/mpp-300x212.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\n\n\n\n<p class=\"has-small-font-size\"> <em>Maximum power point of some PV modules affected by snail trails or micro-cracks measured at STC in comparison with datasheet value (100%).<\/em>  <\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Snail trails (snail tracks) are a product of the formation of silver carbonate nanoparticles which discolor the silver grid. Micro-cracks are instead due to\u00a0thermo-mechanical stress. In the first activity (August 2013) and second activity (Summer 2015) the performances of modules\u00a0affected by &#8220;snail trails&#8221; and\/or &#8220;micro-cracks&#8221;\u00a0phenomena\u00a0are measured and compared to the expected production in order to&#8230;<\/p>\n<p class=\"more-link\"><a href=\"http:\/\/www.solartech.polimi.it\/activities\/snail-trails-and-micro-cracks\/\"><span>Read More<\/span><i>&#43;<\/i><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":80,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0},"_links":{"self":[{"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/pages\/107"}],"collection":[{"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/comments?post=107"}],"version-history":[{"count":5,"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/pages\/107\/revisions"}],"predecessor-version":[{"id":1039,"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/pages\/107\/revisions\/1039"}],"up":[{"embeddable":true,"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/pages\/80"}],"wp:attachment":[{"href":"http:\/\/www.solartech.polimi.it\/wp-json\/wp\/v2\/media?parent=107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}