{"id":30462,"date":"2024-12-03T10:11:13","date_gmt":"2024-12-03T02:11:13","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=30462"},"modified":"2024-12-03T10:11:13","modified_gmt":"2024-12-03T02:11:13","slug":"clc0072","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/clc0072\/","title":{"rendered":"Possible problems with long-term use of EVA materials and the impact of EVA material aging on photovoltaic modules"},"content":{"rendered":"<p><a href=\"https:\/\/www.ray-tron.com\/en\/\" data-internallinksmanager029f6b8e52c=\"14\" title=\"Photovoltaic modules\">Photovoltaic modules<\/a>Some problems that EVA packaging materials may encounter during long-term use, and the impact of EVA material aging on photovoltaic modules.<\/p>\n<p><strong>1. Fading<\/strong><\/p>\n<p>EVA (ethylene-vinyl acetate copolymer), as the packaging material of photovoltaic modules, is prone to discoloration when exposed to outdoor environments for a long time, especially under the influence of ultraviolet rays, temperature and moisture, usually showing &quot;yellowing&quot; or &quot;browning&quot;. This discoloration causes the light transmittance of EVA to decrease, thereby reducing the photocurrent of photovoltaic cells and ultimately leading to power loss of the module. The main reason for the discoloration is that the chemical composition of the EVA material changes under the influence of ultraviolet light and moisture, producing unsaturated polyolefin chromophores. As these compounds accumulate, the color of EVA gradually changes from light yellow to dark brown. This degradation also produces unsaturated carbonyl compounds, which further affect the light transmittance and reduce the efficiency of the module.<\/p>\n<p><strong>2. Layering<\/strong><\/p>\n<p>Degradation of EVA also leads to a loss of adhesion, which eventually causes delamination of the PV module. Delamination usually manifests itself as a loss of adhesion between the cover glass and the solar cell, or between the solar cell and the backplane material, resulting in increased light reflection, increased water permeability, and loss of output power. One of the main causes of delamination is the aging of the EVA material, which destroys the interface connection, especially in hot and humid climates. The aging process is exacerbated, resulting in gaps between the EVA and other layers, further exacerbating the delamination.<\/p>\n<figure id=\"attachment_30460\" aria-describedby=\"caption-attachment-30460\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-30460 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2024\/12\/202412030956148.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><figcaption id=\"caption-attachment-30460\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-30460 lazyload\" src=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2024\/12\/202412030956148.jpg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2024\/12\/202412030956148.jpg 450w, https:\/\/www.ray-tron.com\/wp-content\/uploads\/2024\/12\/202412030956148-300x200.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/noscript> <a href=\"https:\/\/www.ray-tron.com\/en\/pvribbon\/\" data-internallinksmanager029f6b8e52c=\"43\" title=\"Photovoltaic welding ribbon\">Photovoltaic welding ribbon<\/a>factory<\/figcaption><\/figure>\n<p><strong>3. Foaming<\/strong><\/p>\n<p>Blistering is a phenomenon caused by the lack of adhesion of EVA. Although the affected area is small, it will cause the heat dissipation efficiency of the module to decrease, increase the risk of overheating, and thus shorten the service life of the photovoltaic module. Bubbles are usually generated during chemical reactions, especially in the center of the battery. Due to the high temperature inside the battery, the adhesion of EVA is uneven, and the gas is easy to gather in the package. Occasionally, bubbles will form between the glass and the battery. Bubbles not only affect the absorption of sunlight by the photovoltaic module, but also increase the reflection of light, reducing the photoelectric conversion efficiency of the photovoltaic module.<\/p>\n<p>These problems all involve the aging and degradation process of EVA materials. Therefore, in the design, manufacturing and use of photovoltaic modules, special attention should be paid to material selection, process control and environmental impact in order to extend the service life of the modules as much as possible and improve their efficiency.<\/p>","protected":false},"excerpt":{"rendered":"<p>Some problems that EVA packaging materials in photovoltaic modules may encounter during long-term use, and the impact of EVA material aging on photovoltaic modules. 1. Fading EVA [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[19],"tags":[368],"class_list":["post-30462","post","type-post","status-publish","format-standard","hentry","category-blog","tag-eva"],"_links":{"self":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/30462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/comments?post=30462"}],"version-history":[{"count":0,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/30462\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/media?parent=30462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/categories?post=30462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/tags?post=30462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}