{"id":117597,"date":"2023-08-16T11:39:06","date_gmt":"2023-08-16T09:39:06","guid":{"rendered":"https:\/\/www.velasolaris.com\/handbuch\/weather-data\/"},"modified":"2026-07-07T13:22:50","modified_gmt":"2026-07-07T11:22:50","slug":"weather-data","status":"publish","type":"handbuch","link":"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/getting-started\/weather-data\/","title":{"rendered":"Weather Data"},"content":{"rendered":"\n<h1 id=\"h-energy-meteorology\" class=\"wp-block-heading\">Energy Meteorology<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the first steps of the project design is the selection of the weather data. Polysun provides reliable yield forecasts for more than 8400 locations worldwide, but also allows reading meteo data from a file, calculating of hourly meteo data from external monthly values and obtaining the meteo data from the location through the internet from the Meteonorm webservice.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" hcb-fetch-image-from=\"https:\/\/youtu.be\/P8qIFdFReCc\" title=\"Defining the Location and Weather-data for Polysun projects\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/P8qIFdFReCc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\"><strong>Video: Meteorological data<\/strong><\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 id=\"Location\" class=\"wp-block-heading\" style=\"font-size:30px\">Location<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The weather data dialog window can be easily accessed in the \u2018Geographical Location\u2019 in the project folder in the upper left side.<\/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-full\"><img loading=\"lazy\" decoding=\"async\" width=\"248\" height=\"215\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Define-Location.png\" alt=\"\" class=\"wp-image-144205\" srcset=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Define-Location.png 248w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Define-Location-200x173.png 200w\" sizes=\"auto, (max-width: 248px) 100vw, 248px\" \/><figcaption class=\"wp-element-caption\">Figure: defining the location of the system<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">A suitable geographical location can be chosen either \u2018from map\u2019 or \u2018from database\u2019. In order to define the location from the database the following parameters shall be specified: continent, country and location of the system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The map of the world is available at a resolution of 3 km. However, not all of the locations can be found on the map by entering the name in the field of the \u2018Search\u2019 option. In this case you would have to look for them manually on the map, the weather data will be interpolated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The location of the system includes the continent, country and the city. You can also decide whether to apply \u2018daylight saving time option\u2019 or ignore it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are six options available for weather data: \u2018from location (according to Meteonorm version 8)\u2019, \u2018Profile\u2019, \u2018Webservice\u2019, \u2018from location (1 h, according to Meteonorm version 6)\u2019, \u2019from location (1 min, according to Meteonorm version 6)\u2019 and \u2018External monthly values\u2019.<\/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-full\"><img loading=\"lazy\" decoding=\"async\" width=\"958\" height=\"573\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/location-of-the-system.png\" alt=\"\" class=\"wp-image-144208\" srcset=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/location-of-the-system.png 958w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/location-of-the-system-300x179.png 300w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/location-of-the-system-768x459.png 768w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/location-of-the-system-200x120.png 200w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/location-of-the-system-400x239.png 400w\" sizes=\"auto, (max-width: 958px) 100vw, 958px\" \/><figcaption class=\"wp-element-caption\">Figure: location of the system<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The option \u2018import weather data from Meteonorm Vers. 6\u2019 can be chosen in order to calculate weather data for the given location by embedded Meteonorm procedure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For Meteonorm version 6 the underlying measured weather data date from 1986 &#8211; 2005: the irradiance parameters date from 1986 &#8211; 2005, the other parameters from 1996 \u2013 2005.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The option \u2018import weather data from Meteonorm Vers. 8\u2019 can be chosen in order to use embedded weather profiles available for more than 7500 locations. For this option, the location has to be chosen from the drop-down list and not from the map.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The option \u2018Meteonorm version 8\u2019 is recommended since it provides the more up-to-date data. The option \u2018Meteonorm version 6\u2019 is kept for backwards compatibility reasons. If the location has to be chosen specifically from the map, then the \u201cwebservice\u201d option is recommended as it provides the most up-to-date data. However, in order to use \u201cwebservice\u201d the internet-connection has to be provided.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For Meteonorm version 8 the irradiance parameters date from 2001 \u2013 2020,  all other parameters date from 2000 \u2013 2019.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For more detailed information see <a href=\"http:\/\/www.meteonorm.com\">www.meteonorm.com<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Besides the meteo data included in Polysun, many other sources are available. Thus, the option \u2018Profile\u2019 allows to import the meteo data from the file (with .CSV extension \u201cComma Separated Values\u201d). In this case, the on-site measurements can be used. The software requires the following hourly weather data:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gh&nbsp;&nbsp;&nbsp;&nbsp; Global radiation [Wh\/m<sup>2<\/sup>]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dh&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Diffuse radiation [Wh\/m<sup>2<\/sup>]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lh&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Long wave irradiation [Wh\/m<sup>2<\/sup>]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tamb Ambient temperature [\u00b0C]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vwnd&nbsp; Wind [m\/s]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hrel&nbsp;&nbsp;&nbsp; Humidity [%]<\/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 loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"635\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-1024x635.png\" alt=\"\" class=\"wp-image-144210\" style=\"width:935px;height:549px\" srcset=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-1024x635.png 1024w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-300x186.png 300w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-768x476.png 768w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-1536x952.png 1536w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-1300x806.png 1300w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-200x124.png 200w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile-400x248.png 400w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Weather-Profile.png 1865w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Figure: selecting weather data from profile<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">It is possible to use one of the profiles available in the catalog. Please note, that importing the weather data from a file you need to select the same location under \u2018Location of the system\u2019 since the sun path is defined from location of the system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can also copy one of the available Meteorological data profiles with chosen name, open it and insert the available measured weather data in the corresponding column.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The option \u2018External monthly values\u2019 allows doing manual changes in the available monthly values. In this case the hourly meteo data is calculated from monthly values by embedded Meteonorm procedure.<\/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-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"981\" height=\"592\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Custom-external-monthly-data.png\" alt=\"\" class=\"wp-image-144212\" style=\"width:800px;height:612px\" srcset=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Custom-external-monthly-data.png 981w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Custom-external-monthly-data-300x181.png 300w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Custom-external-monthly-data-768x463.png 768w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Custom-external-monthly-data-200x121.png 200w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Custom-external-monthly-data-400x241.png 400w\" sizes=\"auto, (max-width: 981px) 100vw, 981px\" \/><figcaption class=\"wp-element-caption\">Figure: external monthly values of weather data<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Polysun gives an opportunity to use newest weather data from Meteonorm \u2018Webservice\u2019. This weather data is dynamic and changes according to the Meteonorm website. It uses the Meteonorm Version 9. The parameters date from 2001-2020. First you can choose the \u2018Webservice\u2019 option and then switch to the system diagram. <\/p>\n\n\n\n<h3 id=\"Horizon-and-Shading\" class=\"wp-block-heading\" style=\"font-size:30px\">Horizon and Shading<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In order to make a precise calculation of the energy yield of a solar energy system, any possible shadow creating objects, such as adjacent houses, trees, mountains, etc. shall be taken into account. Shading obstacles have even bigger influence on the solar array\u2019s performance in winter months because of the low sun elevation. The shortest day of the year in the Northern Hemisphere, December 21<sup>st<\/sup>, can be used for shading calculation as a worst-case scenario.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The horizon profile as well as nearby obstruction and shadings can be simulated in the \u2018Horizon editor\u2019, which allows you to take into account the surrounding topography. The objects are taken into account based on distance and height. The dimensions of the objects are then reflected on the horizon line, allowing greater precision in site data entry and yield calculation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In order to define the horizon, you can click on the location of the system, selecting the project location. The \u2018Horizon editor\u2019 can be opened by clicking on \u201cEdit\u201d. The Horizon editor is divided into four parts. In the upper left part, there is a horizon line, which is indicated with the red line and the sun path, which is indicated with the yellow line. The sun path can be displayed throughout the year on a daily basis or during one day on an hourly basis by moving the sliding bars on the right side. If you go on the lower left part, there are obstructions and mutual shadings. In the \u2018Obstruction\u2019 tab you can enter a building or an object which is located near your PV module or solar collector. You can start by importing the profile of the horizon of the selected location. In order to do that we can click on the Meteonorm button and the horizon of the chosen location will be indicated with a red line. Then you can define the new object in the \u2018Obstruction\u2019 tab by indicating the distance to the object, the height of the object and the Azimuth angle to the left side of the object. In the \u2018Mutual Shading\u2019 tab Polysun offers a possibility for mutual sheds optimization. In this tool, you can define the location and the disposition of the PV module or solar collector area. The mutual shading depends on the shed orientation towards the southern direction (a), the distance between the rows (d), tilt angle (\u03b1) and the height of the solar collector or a PV module (w), which cause the shading.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then you can click on the button \u2018Add to Horizon\u2019 and the object and the mutual shadings will be added in the horizon line. The Horizon profile can also be adjusted manually by inserting azimuth and elevation angles in the bottom right part of the \u2018Horizon editor\u2019. In order to delete all changes in the horizon profile, you can click the Reset button.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Horizon profile can also be imported by a *.hor file from other tools and sources.<\/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-full\"><img loading=\"lazy\" decoding=\"async\" width=\"809\" height=\"800\" src=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Horizon-Editor.png\" alt=\"\" class=\"wp-image-144214\" srcset=\"https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Horizon-Editor.png 809w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Horizon-Editor-300x297.png 300w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Horizon-Editor-768x759.png 768w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Horizon-Editor-200x198.png 200w, https:\/\/www.velasolaris.com\/wp-content\/uploads\/2023\/08\/Horizon-Editor-400x396.png 400w\" sizes=\"auto, (max-width: 809px) 100vw, 809px\" \/><figcaption class=\"wp-element-caption\">Figure: defining the horizon and shadings in the horizon editor<\/figcaption><\/figure>\n<\/div>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" hcb-fetch-image-from=\"https:\/\/youtu.be\/WVsl98ggW9s\" title=\"Editing the Horizon line in Polysun\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/WVsl98ggW9s?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Video: Nearby and row-to-row shading<\/strong><\/p>\n","protected":false},"author":19748,"featured_media":0,"parent":117524,"menu_order":39,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-117597","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>Energy meteorology: weather data for precise simulations<\/title>\n<meta name=\"description\" content=\"Discover energy meteorology with Polysun and access weather data for over 8,400 locations worldwide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/getting-started\/weather-data\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" 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