{"id":7593,"date":"2023-06-02T09:15:41","date_gmt":"2023-06-02T07:15:41","guid":{"rendered":"https:\/\/cubeconcepts.de\/?p=7593"},"modified":"2026-06-01T15:11:03","modified_gmt":"2026-06-01T13:11:03","slug":"the-dimensioning-factor-for-inverters","status":"publish","type":"post","link":"https:\/\/cubeconcepts.de\/en\/der-dimensionierungsfaktor-fuer-wechselrichter\/","title":{"rendered":"The dimensioning factor for inverters"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The inverter sizing factor describes the ratio between the maximum direct current (DC) output of all installed photovoltaic modules and the maximum alternating current (AC) output of the entire PV system. It serves as the basis for determining the size and number of inverters required. These inverters convert the solar power into grid-compliant alternating current (AC), which is suitable for connection to the public power grid or for direct consumption within the company. The sizing factor is calculated as the ratio of the inverter\u2019s DC power to the PV power. If the system is undersized, the value is above 100; if it is oversized, the value is below 100. A sizing factor of 100 % therefore means that, for example, with an installed PV capacity of 700 kWp, the DC inverter capacity is also 700 kW. However, such a configuration is not always the optimal or most economical one. Therefore, the sizing factor must be recalculated individually for each commercial photovoltaic system during the planning phase.&nbsp;&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"989\" height=\"751\" src=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image.png\" alt=\"\" class=\"wp-image-7594\" style=\"width:614px;height:466px\" srcset=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image.png 989w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image-300x228.png 300w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image-768x583.png 768w\" sizes=\"(max-width: 989px) 100vw, 989px\" \/><figcaption class=\"wp-element-caption\"><em>Example: Planning a 700 kWp roof-mounted system in east-west orientation - each color represents a separate module string.<\/em><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Inverters and module strings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The planning of larger photovoltaic systems for businesses becomes complex because only solar modules with the same actual power output should be connected to an inverter. For such a string, all modules must therefore have the same orientation, inclination, and shading so that the inverter can efficiently convert direct current into alternating current. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">80 different strings for dimensioning at 700 kWp<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">However, one usually plans different <a href=\"https:\/\/cubeconcepts.de\/en\/suitable-commercial-and-industrial-areas-for-pv-systems\/\">Hall roofs<\/a>, Inverters, solar carports, solar canopies, or open-space fields with different orientations, tilts, and shading. The calculation takes place again every time a module string with a new MPP tracker of the inverter or an MPP tracker of a multi-string inverter is completely planned. To remain with a system size of 700 kWp, the planner already calculates about 80 strings for a simple roof PV system of this dimension if the system is to have an east-west orientation, as the number of modules per string also cannot be arbitrarily large: The most powerful inverters today can convert a maximum of 1,000 volts per string, which corresponds to a power of about 20 modules.<\/p>\n\n\n\n<figure class=\"wp-block-image alignleft size-full is-resized\"><img decoding=\"async\" width=\"701\" height=\"402\" src=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image-1.png\" alt=\"\" class=\"wp-image-7601\" style=\"width:614px;height:352px\" srcset=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image-1.png 701w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/MicrosoftTeams-image-1-300x172.png 300w\" sizes=\"(max-width: 701px) 100vw, 701px\" \/><figcaption class=\"wp-element-caption\"><em>Planning of a single string with a dimensioning factor of 117.9 %<\/em><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Most of the time, inverters are in partial load operation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With a dimensioning factor for inverters of 100 %, it is assumed that under ideal conditions, i.e. with optimum solar radiation without clouds and at temperatures below 25\u00b0, each string with its inverter delivers the best possible electricity yield. However, such conditions rarely exist and most of the time an inverter is operated at partial load. And this is precisely where the problem lies: all inverters no longer work as efficiently under partial load. This effect sets in from a 20 percent power drop in the string and an 80 percent partial load operation of the inverter. Apart from the higher investment costs of large inverters, undersizing is therefore also economical.<\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized\"><img decoding=\"async\" width=\"579\" height=\"626\" src=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/Screenshot-2023-06-02-090019.jpg\" alt=\"\" class=\"wp-image-7608\" style=\"width:394px;height:425px\" srcset=\"https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/Screenshot-2023-06-02-090019.jpg 579w, https:\/\/cubeconcepts.de\/wp-content\/uploads\/2023\/06\/Screenshot-2023-06-02-090019-277x300.jpg 277w\" sizes=\"(max-width: 579px) 100vw, 579px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">A dimensioning factor for inverters greater than 100 % is economical<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bei der wirtschaftlichen Planung einer gesamten Photovoltaikanlage f\u00fcr ein Unternehmen spielt die Berechnung und Dimensionierung der Wechselrichter dadurch eine entscheidende Rolle. Sind sie unterdimensioniert, lassen sich die Leistungsspitzen nur dann kappen, wenn ideale Bedingungen herrschen. Dieser Energieverlust \u00fcber einen gesamten Jahresverlauf einer PV-Anlage ist in der Regel marginal und muss dann den h\u00f6heren Investitionskosten f\u00fcr gr\u00f6\u00dfere Wechselrichter entgegengesetzt werden. Bei einer 700 kWp-Anlage, die j\u00e4hrlich je nach Standort etwa 630.000 &#8211; 700.000 kWh produzieren k\u00f6nnte, wenn sie mit einem Dimensionierungsfaktor von 100 % geplant w\u00fcrde, betr\u00e4gt der Energieverlust in unseren Breitengraden bei einer Unterdimensionierung von 120 %&nbsp; durchschnittlich 4.500 kWh. Demgegen\u00fcber stehen mehrere zehntausende Euro f\u00fcr Wechselrichter, die eine h\u00f6here Nennleistung aufweisen. Je nach Sonneneinstrahlungsintensit\u00e4t gelten in Europa Dimensionierungsfaktoren zwischen 110 und 130 % als besonders wirtschaftlich. Alleine in Deutschland kann dieser Wert um +\/- 5 % je nach Standort variieren.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/cubeconcepts.de\/en\/knowledge\/fachbeitraege\/\">Back to overview<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"15300\" class=\"elementor elementor-15300\" data-elementor-post-type=\"elementor_library\">\n\t\t\t<div class=\"elementor-element elementor-element-7720627 e-flex e-con-boxed e-con e-parent\" data-id=\"7720627\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-e2d7cf1 e-con-full e-flex e-con e-child\" data-id=\"e2d7cf1\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-7f42313 e-con-full e-flex e-con e-child\" data-id=\"7f42313\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-42660e6 elementor-widget elementor-widget-heading\" data-id=\"42660e6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Energy Newsletter<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b495a97 elementor-widget elementor-widget-spacer\" data-id=\"b495a97\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-916e623 elementor-widget elementor-widget-text-editor\" data-id=\"916e623\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Always stay up-to-date!<\/p><p><strong>Your advantages:<\/strong><\/p><p>\u2713 Latest news on renewable energies<\/p><p>\u2713 Updates on energy law &amp; 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This article explains how to find the balance between maximum yield and optimal system costs by precisely calculating the oversizing factor.<\/p>","protected":false},"author":3,"featured_media":7596,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61,25],"tags":[],"class_list":["post-7593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-grundlagen-technik","category-photovoltaik"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dimensionierungsfaktor f\u00fcr Wechselrichter | CUBE CONCEPTS<\/title>\n<meta name=\"description\" content=\"Der Dimensionierungsfaktor f\u00fcr Wechselrichter spielt eine entscheidende Rolle f\u00fcr die Wirtschaftlichkeit von Photovoltaikanlagen.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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