{"id":117618,"date":"2023-08-16T13:53:05","date_gmt":"2023-08-16T11:53:05","guid":{"rendered":"https:\/\/www.velasolaris.com\/handbuch\/inverters\/"},"modified":"2025-10-14T10:44:53","modified_gmt":"2025-10-14T08:44:53","slug":"inverters","status":"publish","type":"handbuch","link":"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/electric-components\/inverters\/","title":{"rendered":"Inverters"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"Automatic-Inverter-Layout\" style=\"font-size:30px\">Inverter Sizing: Optimize PV Systems with Polysun\u2019s Assistant<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Inverter sizing is crucial for optimizing solar system performance, and <a href=\"https:\/\/www.velasolaris.com\/en\/products\/polysun-designer\/\">Polysun\u2019s <\/a>Inverter Assistant streamlines this process with tailored configurations. The tool makes inverter sizing for solar systems straightforward, accessible by double-clicking the Photovoltaic or PVT component and clicking the Assistant icon. It provides a list of possible configurations (see image below) for your PV system, with a menu displaying these options for easy selection of correct inverter size.<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/10\/image55-2-1024x688.png\" alt=\"\" class=\"wp-image-71064\"\/><figcaption class=\"wp-element-caption\">Figure: inverter configuration<\/figcaption><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The following data are given in the calculation of configuration system diagrams:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Location<\/li>\n\n\n\n<li>Type of module<\/li>\n\n\n\n<li>Number of modules<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally the following values will also be considered in the calculation of the max. DC power (and partially also for the calculation of the min. and max. module temperature and therefore the max. MPP voltage and the max. DC current): orientation, , tilt angle, level of soiling, degradation, wind percentage and rear ventilation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\" id=\"Configuration-Result-\u2013-Configuration-System-Diagrams:\">Configuration Result \u2013 Configuration System Diagrams:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Configuration system diagrams are characterised through the following data:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type of inverter<\/li>\n\n\n\n<li>Number of inverters<\/li>\n\n\n\n<li>Number of MPP trackers employed<\/li>\n\n\n\n<li>Number of strings (per inverter or MPP tracker)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Number-of-MPP-Trackers-Employed:\"><strong>Number of MPP Trackers Employed:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In case multi-string inverters are used Polysun attempts to reach the full or partial allocation of all MPP-controlled inputs. The configuration programme assumes here that strings were allocated uniformly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally the following data will also be displayed&nbsp; in the inverter assistant:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">inverter manufacturer, number of modules per string and power ratio.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Power-Ratio:\"><strong>Power Ratio:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The term \u201cpower ratio\u201c refers in Polysun to the ratio between generator output at standard test conditions (STC) and the inverter\u2019s maximum DC output.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Electrical-Limit-Values:\"><strong>Electrical Limit Values:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Configuration system diagrams are essentially selected based on the relevant electrical limit values. Polysun basically only reproduces combinations that comply with the limit values specified below (occasionally subject to particular operation and weather conditions). Voltage and current peaks can be calculated by means of the temperature coefficients included in the catalog.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table: Electrical limits for the selection of the layout variants<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Nr.<\/strong><\/td><td><strong>Component<\/strong><\/td><td><strong>Limit value<\/strong><\/td><td><strong>Mode<\/strong><\/td><td><strong>Weather conditions<\/strong><\/td><\/tr><tr><td>1<\/td><td>Inverter<\/td><td>Max. DC output<\/td><td>&nbsp;<\/td><td>Max. irradiance<\/td><\/tr><tr><td>2<\/td><td>Inverter<\/td><td>Max. DC voltage<\/td><td>Idling<\/td><td>Min. air temperature<\/td><\/tr><tr><td>3<\/td><td>Inverter<\/td><td>Min. MPP voltage<\/td><td>MPP<\/td><td>Max. air temperature<\/td><\/tr><tr><td>4<\/td><td>Inverter<\/td><td>Max. MPP voltage<\/td><td>MPP<\/td><td>Min. module temperature<\/td><\/tr><tr><td>5<\/td><td>Inverter<\/td><td>Max. DC current<\/td><td>MPP<\/td><td>Max. module temperature<\/td><\/tr><tr><td>6<\/td><td>Module<\/td><td>Max. system voltage<\/td><td>Idling<\/td><td>Min. air temperature<\/td><\/tr><tr><td>7<\/td><td>Mains<\/td><td>Max. phase imbalance<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Module-Temperature-Calculation:-\"><strong>Module Temperature Calculation:&nbsp;<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Polysun enables module temperature to be calculated by the user. The following data are considered in the calculation: air temperature, irradiance, module gamma, wind percentage and rear ventilation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If PVT collectors are used a fixed minimum (10\u00b0C) and maximum temperature (80\u00b0C) are assumed for inverter configuration purposes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Phase-Imbalance:\"><strong>Phase Imbalance:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The configuration system diagrams provided by the configuration assistant comply with the requirement for a maximum phase imbalance of 4.2 kVA.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Thin-Film-Modules-\u2013-Galvanic-Separation:\"><strong>Thin-Film Modules \u2013 Galvanic Separation:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Thin-film modules should only be operated with a transformer or galvanic separation. This applies to all inverter configurations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Filters\/Tolerances:\"><strong>Filters\/Tolerances:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Configuration system diagrams are eventually filtered, i.e. only given tolerance values will be allowed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\" id=\"Filters\/Tolerances-Inverter-Assistant:\"><strong>Filters\/Tolerances Inverter Assistant:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The following fixed-sized filters will be used in the inverter assistant:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0.75 &lt;= power ratio &lt;= 1.25.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally a fixed tolerance of 10% is given fort he maximum input power. A tolerance of 0% applies to all remaining maximum values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There isn&#8217;t any guarantee that the automatic inverter layout wizard will find every solution suggested by a manufacturer tool. According to the conditions very detailed intermediate results could occur which then require limitations due to limited resources (memory, simulation time etc.). In those cases the user should design the inverter manually (chapter 2.2.2).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Manual-Inverter-Layout\" style=\"font-size:30px\">Manual Inverter Sizing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u2018Automatic\u2019 or \u2018Manual\u2019 inverter layout shall be chosen in the dialog window by clicking on the photovoltaic component in the system diagram.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is a common practice to start the project with a Wizard design and then adapt the automatic design version to the required conditions. If the system shall be slightly changed, manual design is also preferable.<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/10\/image56-1-1024x822.png\" alt=\"\" class=\"wp-image-71067\" style=\"width:675px;height:542px\"\/><figcaption class=\"wp-element-caption\">Figure: manual inverter layout<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">With a manual inverter design the following parameters can be changed:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table: List of parameters for the manual inverter design<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Parameters<\/strong><\/td><td><strong>Description<\/strong><\/td><\/tr><tr><td><strong>Number of inverter types<\/strong><strong><\/strong><\/td><td>Defines the number of inverter layouts (sub-layouts) in the combined layout. Up to 3 sub-layouts are possible. Each inverter layout (sub-layout) is defined by the inverter type, the number of inverters, the number of strings and the number of modules per each tracker.<\/td><\/tr><tr><td><strong>Layout: Inverter<\/strong><\/td><td>Selection of the inverter from the catalog.<\/td><\/tr><tr><td><strong>Layout: Number of Inverters<\/strong><strong><\/strong><\/td><td>Number of parallel connected inverters.<\/td><\/tr><tr><td><strong>Layout: Number of strings<\/strong><\/td><td>Number of strings in parallel per inverter. The maximum current of the PV generator should not exceed the maximum input current of the inverter, otherwise premature aging of the inverter will take place.<\/td><\/tr><tr><td><strong>Layout: Number of the modules per string<\/strong><strong><\/strong><\/td><td>Number of modules in series.<\/td><\/tr><tr><td><strong>Layout: Orientation<\/strong><\/td><td>The azimuth angle (0\u00b0 = South, +90\u00b0 = East, -90\u00b0 = West, +\/-180\u00b0 = North) allows to define a different value per each tracker input. Optimal orientation depends on the local weather and climate conditions, however generally taken if possible in the direct south direction.<\/td><\/tr><tr><td><strong>Layout: Tilt angle<\/strong><strong><\/strong><\/td><td>Fixed angle at which PV modules are mounted from the horizontal plane, allows to define a different value per each tracker input. Tilt angle shall be chosen in order to maximize the exposure of the PV panel to the direct sunlight.<\/td><\/tr><tr><td><strong>cos \u03c6<\/strong><\/td><td>Sets the cos \u03c6 (ratio between real power and apparent power called power factor) to a constant value. The default value is cos \u03c6 = 1 which means no reactive power. The usable power is only a real power. The grid operator may demand to set up certain power factor cos \u03c6 in order to avoid high additional load, which cannot be used to supply electrical devices.<\/td><\/tr><tr><td><strong>Energy source<\/strong><strong><\/strong><\/td><td>Energy source used as reference to calculate the economical and ecological results<\/td><\/tr><tr><td><strong>Grid Wiring<\/strong><\/td><td>Defines how single phase inverters are connected to the grid if there is more than one option. Refers to split-phase and high leg delta grids only. Options for split-phase grid:<br>1. \u2018Split\u2019 or line to neutral (120V)<br>2. \u2018Default\u2019 or line-to-line (240V)<br>Options for high-leg delta grid:<br>1. \u2018Split\u2019 or line to neutral (120V)<br>2. \u2018High-leg\u2019 high leg to neutral (208 V)<br>3. \u2018Default\u2019 or line-to-line (240V)<br>The default value is \u2018default\u2019.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If the layout is changed manually in the photovoltaic component dialog window, it shall be checked afterwards through the Wizard for validity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Manual inverter design is often used for inverters with multiple MPP trackers (multistring concept). Multistring inverters are simulated as one device with multiple, independent DC inputs and one AC output. Polysun supports up to 10 MPP-inputs. It is possible to manually define different sub-layouts for each MPPT-input available for the specific inverter type. The automatic layout algorithm always uses all the available tracker inputs. In the manual layout mode, you can set individual orientations and tilt angles for each tracker input by overriding the settings of the component. The PV-array pro MPPT input shall be homogeneous. Currently the multistring inverters can be simulated with only one module type.<\/p>\n","protected":false},"author":19748,"featured_media":0,"parent":117525,"menu_order":34,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-117618","handbuch","type-handbuch","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Inverter Sizing: Optimize PV Systems with Polysun<\/title>\n<meta name=\"description\" content=\"Streamline inverter sizing for PV systems with Polysun\u2019s Inverter Assistant. 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