{"id":54,"date":"2026-07-02T22:12:41","date_gmt":"2026-07-02T20:12:41","guid":{"rendered":"https:\/\/www.calibsun.com\/?page_id=54"},"modified":"2026-07-28T17:47:44","modified_gmt":"2026-07-28T15:47:44","slug":"sur-place","status":"publish","type":"page","link":"https:\/\/www.calibsun.com\/fr\/solar-data\/on-site\/","title":{"rendered":"Expertise | On site solar data"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"54\" class=\"elementor elementor-54\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ee8fe2f e-con-full e-flex e-con e-parent\" data-id=\"ee8fe2f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-715c7fa3 e-con-full e-flex e-con e-child\" data-id=\"715c7fa3\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;background_motion_fx_motion_fx_scrolling&quot;:&quot;yes&quot;,&quot;background_motion_fx_scale_effect&quot;:&quot;yes&quot;,&quot;background_motion_fx_scale_speed&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:3,&quot;sizes&quot;:[]},&quot;background_motion_fx_scale_range&quot;:{&quot;unit&quot;:&quot;%&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:{&quot;start&quot;:50,&quot;end&quot;:100}},&quot;background_motion_fx_scale_direction&quot;:&quot;out-in&quot;,&quot;background_motion_fx_devices&quot;:[&quot;desktop&quot;,&quot;laptop&quot;,&quot;tablet_extra&quot;,&quot;tablet&quot;,&quot;mobile&quot;]}\">\n\t\t<div class=\"elementor-element elementor-element-495981f4 e-con-full e-flex e-con e-child\" data-id=\"495981f4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3bc529a2 elementor-icon-list--layout-inline elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"3bc529a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items elementor-inline-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Calibsun | Expertise<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ada6634 elementor-widget elementor-widget-heading\" data-id=\"1ada6634\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\"><span class=\"color-orange\">On-Site Solar Data:<\/span> The primary source of truth for accurate power forecasting<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-20d99567 e-flex e-con-boxed e-con e-parent\" data-id=\"20d99567\" 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-5be6fe92 e-con-full e-flex e-con e-child\" data-id=\"5be6fe92\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-6cd04ff3 e-con-full e-flex e-con e-child\" data-id=\"6cd04ff3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-58131f11 elementor-widget-tablet__width-initial elementor-widget elementor-widget-heading\" data-id=\"58131f11\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Introduction<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7ad79b26 elementor-widget-tablet__width-initial elementor-widget elementor-widget-image\" data-id=\"7ad79b26\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.calibsun.com\/wp-content\/plugins\/elementor\/assets\/images\/placeholder.png\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-37bc3083 e-con-full e-flex e-con e-child\" data-id=\"37bc3083\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-139fc191 text-pretty elementor-widget elementor-widget-text-editor\" data-id=\"139fc191\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">On-site solar data refers to all ground-based measurements collected directly at a photovoltaic power plant (irradiance, power output, temperature, wind) to monitor real weather conditions in real time. For solar power forecasting, these in situ measurements are not a secondary input: they are the primary source of truth that satellite imagery and numerical weather prediction (NWP) models cannot replace at short forecast horizons. For IPPs, aggregators, and grid operators managing imbalance exposure and DSM penalties, the quality of onsite measurements directly conditions forecast accuracy, curtailment detection, and intraday power forecast reliability. On-site solar data enables model recalibration against actual plant behavior, spatial irradiance mapping across large utility-scale sites, and real-time state estimation: three capabilities that satellite-derived irradiance products and NWP alone cannot deliver. <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-03c38fc e-con-full e-flex e-con e-child\" data-id=\"03c38fc\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cce3ba0 elementor-widget-tablet__width-initial elementor-widget elementor-widget-heading\" data-id=\"cce3ba0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Key facts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6afb076 elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"6afb076\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>On-site solar data refers to all ground-based measurements collected directly at a photovoltaic power plant<\/b> (irradiance, power output, temperature, wind speed\u2026) to monitor local weather conditions in real time.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Satellite (3\u201310 km2 refreshed every 15 minutes + lag) and NWP (20 km2, refreshed every 6 h)<\/b> lack the spatial and temporal resolution required for intrahour forecasting on utility-scale PV plants.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Quality check and historical data<\/b> are essential: filtering outliers, detecting sensor drift, and leveraging multi-year time series enable robust model calibration and real-time recalibration, reducing intraday nRMSE.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>CalibSun<\/b> combines existing on-site data or added sky-imagers, satellite imagery, and NWP.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7da4ae76 e-flex e-con-boxed e-con e-parent\" data-id=\"7da4ae76\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-4b7f0849 e-con-full e-flex e-con e-child\" data-id=\"4b7f0849\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-29b36c62 elementor-widget elementor-widget-heading\" data-id=\"29b36c62\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"color-orange\">The main sensors<\/span> deployed at a solar power plant<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3958ac9c elementor-widget elementor-widget-text-editor\" data-id=\"3958ac9c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Photovoltaic power plant equipped for power production forecasting typically integrate several categories of sensors, each measuring a different physical quantity.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">A photovoltaic solar power plant typically integrates several sensor categories, used by Calibsun for power production forecasting. Each sensor is measuring distinct physical quantities for solar energy management.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-72950e12 e-con-full e-flex e-con e-child\" data-id=\"72950e12\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-37f09d88 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"37f09d88\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"682\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-40-1024x873.png\" class=\"attachment-large size-large wp-image-1753\" alt=\"\" srcset=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-40-1024x873.png 1024w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-40-300x256.png 300w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-40-768x655.png 768w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-40-14x12.png 14w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-40.png 1125w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-199f5733 e-con-full e-flex elementor-invisible e-con e-child\" data-id=\"199f5733\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInRight&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1dbfa7de elementor-widget elementor-widget-heading\" data-id=\"1dbfa7de\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">GHI &amp; Weather <span class=\"color-orange\">data<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-719b0704 elementor-widget elementor-widget-text-editor\" data-id=\"719b0704\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Ground data delivers two capabilities that remote sensing structurally cannot. The first is real-time GHI measurement: a pyranometer provides the exact local irradiance, and SCADA tells the model exactly how much electricity the plant is injecting into the grid. This current-state information is essential for short term forecasting.<\/span><\/p><p><span style=\"font-weight: 400;\">Plant-specific model calibration is the second capability. Every photovoltaic power plant has a unique relationship between incident irradiance and power output. Only historical on-site time series (GHI and production measured over a sufficient period) allow CalibSun&#8217;s algorithm to learn this signature.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-be580d9 e-flex e-con-boxed e-con e-parent\" data-id=\"be580d9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-6d6ca79e e-con-full e-flex e-con e-child\" data-id=\"6d6ca79e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-6455d05b e-con-full e-flex e-con e-child\" data-id=\"6455d05b\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;sticky&quot;:&quot;top&quot;,&quot;sticky_on&quot;:[&quot;desktop&quot;,&quot;laptop&quot;,&quot;tablet_extra&quot;,&quot;tablet&quot;],&quot;sticky_offset&quot;:120,&quot;sticky_parent&quot;:&quot;yes&quot;,&quot;sticky_effects_offset&quot;:0,&quot;sticky_anchor_link_offset&quot;:0}\">\n\t\t<div class=\"elementor-element elementor-element-6d4800f5 e-con-full e-flex e-con e-child\" data-id=\"6d4800f5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-16f1c301 elementor-icon-list--layout-inline elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"16f1c301\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items elementor-inline-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Product page<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-22817bcc elementor-widget elementor-widget-heading\" data-id=\"22817bcc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How CalibSun Integrates On-Site data ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-32922e6d e-con-full e-flex e-con e-child\" data-id=\"32922e6d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2d3e2903 elementor-widget elementor-widget-button\" data-id=\"2d3e2903\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#data-quality-historical-calibration\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Data quality control and historical calibration<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5002b8f4 elementor-widget elementor-widget-button\" data-id=\"5002b8f4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#analog-ensemble-algorithm\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">An analog ensemble algorithm<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51c0f5d4 elementor-widget elementor-widget-button\" data-id=\"51c0f5d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#real-time-data-workflow\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">The real-time data workflow<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2147c52a elementor-widget elementor-widget-button\" data-id=\"2147c52a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#sky-imagers\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Sky imagers<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2ef4b2c7 e-con-full e-flex e-con e-child\" data-id=\"2ef4b2c7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-62f6893e e-con-full e-flex e-con e-child\" data-id=\"62f6893e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-397f7a5f elementor-absolute elementor-widget elementor-widget-menu-anchor\" data-id=\"397f7a5f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"data-quality-historical-calibration\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-15f67cbc elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"15f67cbc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"221\" height=\"273\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Data-error.svg\" class=\"attachment-large size-large wp-image-1616\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51b3f1b elementor-widget elementor-widget-heading\" data-id=\"51b3f1b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Data quality control and historical calibration<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7c43d885 elementor-widget elementor-widget-text-editor\" data-id=\"7c43d885\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Before any on-site data enters the forecasting algorithm, it passes through a systematic quality control process. CalibSun flags and removes data that are physically inconsistent: values exceeding the theoretical clear-sky envelope, production readings inconsistent with concurrent solar data and temperature, or sensor readings exhibiting step changes characteristic of hardware failure.<\/span><\/p><p><span style=\"font-weight: 400;\">The cleaned historical dataset, ideally covering at least one year of continuous operation, then serves as the training base for the forecasting model, encoding the plant&#8217;s energy production behavior across the full range of seasonal and weather conditions.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-42bf8dd3 e-con-full e-flex e-con e-child\" data-id=\"42bf8dd3\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6d747132 elementor-absolute elementor-widget elementor-widget-menu-anchor\" data-id=\"6d747132\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"analog-ensemble-algorithm\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a6919eb elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"7a6919eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"240\" height=\"266\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/analog-ensemble.svg\" class=\"attachment-large size-large wp-image-1598\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-325e4d11 elementor-widget elementor-widget-heading\" data-id=\"325e4d11\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">An analog ensemble algorithm<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a4108a2 elementor-widget elementor-widget-text-editor\" data-id=\"2a4108a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">CalibSun&#8217;s forecasting approach is built on an analog ensemble algorithm: a machine learning technique that identifies, in the historical archive of on-site measurements, the past situations most similar to current weather conditions. The energy production outcomes observed during those analogs construct the forecast distribution, both the deterministic central estimate and the full probabilistic envelope from P10 to P90. While deep learning approaches are increasingly used in solar forecasting, the analog ensemble method offers superior interpretability and robustness on the limited historical datasets typical of operational PV sites. A minimum of one year of historical data is recommended at onboarding to ensure the analog pool covers the full range of seasonal conditions.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1f0979e0 e-con-full e-flex e-con e-child\" data-id=\"1f0979e0\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2aac5393 elementor-absolute elementor-widget elementor-widget-menu-anchor\" data-id=\"2aac5393\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"real-time-data-workflow\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1fbaab71 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"1fbaab71\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"293\" height=\"199\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/API-cloud-transfer_1.svg\" class=\"attachment-large size-large wp-image-1599\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b1551b9 elementor-widget elementor-widget-heading\" data-id=\"2b1551b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The real-time data workflow: frequency, latency, and seamless integration<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5b808222 elementor-widget elementor-widget-text-editor\" data-id=\"5b808222\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><b>CalibSun&#8217;s NEXT algorithm ingests on-site measurements continuously via API integration<\/b><span style=\"font-weight: 400;\">. The optimal temporal resolution is 1 minute. In practice, many clients transmit at 5-minute resolution, which is operationally sufficient for most solar forecasting applications. NEXT adapts automatically to the shortest temporal resolution available in the incoming data stream.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">The algorithm operates seamlessly across data availability states. When onsite measurements are temporarily unavailable, the forecasting system continues to operate using satellite and NWP inputs alone. Short-term accuracy is reduced during these gaps, but the service does not interrupt. As measurements resume, the model recalibrates automatically and forecast accuracy is increased.<\/span><\/p><p><b>A minimum of one year of historical on-site data<\/b><span style=\"font-weight: 400;\"> is strongly recommended at onboarding to ensure the analog pool covers the full range of seasonal conditions. Without this baseline, forecast quality improves progressively as on-site measurements accumulate. <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6f46df3f e-con-full e-flex e-con e-child\" data-id=\"6f46df3f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-48cc6579 elementor-absolute elementor-widget elementor-widget-menu-anchor\" data-id=\"48cc6579\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"sky-imagers\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e532837 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"3e532837\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"281\" height=\"252\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/cloud-detection-1.svg\" class=\"attachment-large size-large wp-image-1607\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-767816b4 elementor-widget elementor-widget-heading\" data-id=\"767816b4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Sky imagers: extending local observability below 30 minutes<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1e628d9b elementor-widget elementor-widget-text-editor\" data-id=\"1e628d9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">For very short forecast horizons, below 60 minutes, and especially below 30 minutes, a different question becomes critical: <\/span><b>what cloud structures are approaching the plant, and when will they reach it?<\/b><\/p><p><b>CalibSun deploys networks of sky cameras in a stereoscopic configuration<\/b><span style=\"font-weight: 400;\">: multiple cameras positioned around the plant capture simultaneous images of the sun and sky dome from different angles, enabling three-dimensional reconstruction of cloud positions, geometries, and trajectories. This is the only method capable of anticipating irradiance ramps at sub-30 minutes. <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7d61905 e-flex e-con-boxed e-con e-parent\" data-id=\"7d61905\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-df0feca e-con-full e-flex e-con e-child\" data-id=\"df0feca\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fa0026d elementor-widget elementor-widget-heading\" data-id=\"fa0026d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"color-orange\">Why Satellite and NWP Data<\/span> alone lack accuracy<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba070a4 elementor-widget elementor-widget-text-editor\" data-id=\"ba070a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Satellite-based solar irradiance data and numerical weather prediction models are essential tools in solar resource assessment and day-ahead weather forecasting. But they carry structural limitations that become critical at short forecast horizons, limitations that only on-site data can address.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-830ac92 elementor-widget elementor-widget-heading\" data-id=\"830ac92\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The spatial resolution problem: what satellites and NWP cannot see<\/h3>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f276f26 e-con-full e-flex e-con e-child\" data-id=\"f276f26\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43a92be elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"43a92be\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"682\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41-1024x873.png\" class=\"attachment-large size-large wp-image-1754\" alt=\"\" srcset=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41-1024x873.png 1024w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41-300x256.png 300w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41-768x655.png 768w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41-1536x1309.png 1536w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41-14x12.png 14w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-41.png 1552w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1430bf7 e-con-full e-flex elementor-invisible e-con e-child\" data-id=\"1430bf7\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInRight&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5f8b032 elementor-widget elementor-widget-heading\" data-id=\"5f8b032\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Satellite: 15 minutes + data retrieval and treatment lag at 2km2 resolution<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-352759a elementor-widget elementor-widget-text-editor\" data-id=\"352759a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Satellite irradiance products typically operate at spatial resolutions of several kilometers per pixel. For a utility-scale solar power plant, this means that the irradiance driving solar energy production is represented by a spatially smoothed estimate that cannot capture sub-kilometer output variability.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-114992e e-con-full e-flex e-con e-child\" data-id=\"114992e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-e2b76f8 e-con-full e-flex elementor-invisible e-con e-child\" data-id=\"e2b76f8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInLeft&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ab687b elementor-widget elementor-widget-heading\" data-id=\"7ab687b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Meteorological model : 6h + data retrieval and treatment lag at 10km2 resolution<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0e3e432 elementor-widget elementor-widget-text-editor\" data-id=\"0e3e432\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Numerical weather prediction models face a similar constraint, operating at spatial resolutions ranging from a few kilometers to tens of kilometers. At these scales, local weather conditions are either smoothed out or represented with significant temporal lag. At intraday horizons, satellite and NWP inputs alone produce power forecasts that miss the rapid irradiance ramps caused by passing cloud cover, precisely the events that drive imbalance exposure and DSM penalties.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-49e7149 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"49e7149\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"682\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site--1024x873.png\" class=\"attachment-large size-large wp-image-1752\" alt=\"\" srcset=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site--1024x873.png 1024w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site--300x256.png 300w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site--768x655.png 768w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site--1536x1309.png 1536w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site--14x12.png 14w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/Export_On-site-.png 1552w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d9e9e44 e-con-full e-flex e-con e-parent\" data-id=\"4d9e9e44\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-760b2b8e elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"760b2b8e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"868\" src=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/frequently-asked-questions-2.webp\" class=\"attachment-large size-large wp-image-1902\" alt=\"\" srcset=\"https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/frequently-asked-questions-2.webp 721w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/frequently-asked-questions-2-249x300.webp 249w, https:\/\/www.calibsun.com\/wp-content\/uploads\/2026\/07\/frequently-asked-questions-2-10x12.webp 10w\" sizes=\"(max-width: 721px) 100vw, 721px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3104ee6e e-con-full e-flex e-con e-child\" data-id=\"3104ee6e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-6f53fb64 e-con-full e-flex e-con e-child\" data-id=\"6f53fb64\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6802ad35 elementor-icon-list--layout-inline elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"6802ad35\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items elementor-inline-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Questions<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e5fbdf2 elementor-widget elementor-widget-heading\" data-id=\"6e5fbdf2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently asked questions about on-site solar data<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-261ec7f6 elementor-widget elementor-widget-n-accordion\" data-id=\"261ec7f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;all_collapsed&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-6390\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-6390\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> What is on-site solar data and why does it matter for solar power forecasting? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 11.6351L31.5103 27.0167C32.1857 28.5487 33.3677 30.1421 35 31L33.1989 31C30.3846 31 27.8518 29.2228 26.6135 26.4652L20.8724 13.1671C20.8724 13.1671 20.591 12.6769 20.0844 12.7382C19.5779 12.7382 19.2964 13.1671 19.2964 13.1671L13.5553 26.4652C12.3734 29.2228 9.78424 31 6.96998 31L5 31C6.63227 30.1421 7.81426 28.5487 8.48968 27.0167L15.3002 11.6351C16.0882 9.61282 18.7899 9 19.9719 9C21.1538 9 23.8555 9.55153 24.6435 11.6351L24.6998 11.6351Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 28.3649L31.5103 12.9833C32.1857 11.4513 33.3677 9.85794 35 9L33.1989 9C30.3846 9 27.8518 10.7772 26.6135 13.5348L20.8724 26.8329C20.8724 26.8329 20.591 27.3231 20.0844 27.2618C19.5779 27.2618 19.2964 26.8329 19.2964 26.8329L13.5553 13.5348C12.3734 10.7772 9.78424 9 6.96998 9L5 9C6.63227 9.85794 7.81426 11.4513 8.48968 12.9833L15.3002 28.3649C16.0882 30.3872 18.7899 31 19.9719 31C21.1538 31 23.8555 30.4485 24.6435 28.3649L24.6998 28.3649Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-6390\" class=\"elementor-element elementor-element-28aa536a e-con-full e-flex e-con e-child\" data-id=\"28aa536a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-63d9cecf elementor-widget elementor-widget-text-editor\" data-id=\"63d9cecf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">On-site solar data encompasses all ground measurements collected directly at photovoltaic installations: solar irradiance from pyranometers, electrical power output from SCADA systems, and meteorological variables. These in situ measurements provide real-time plant state and enable plant-specific model calibration \u2014 a core<\/span> <span style=\"font-weight: 400;\">capability that satellite data and NWP cannot deliver. For the renewable energy industry, this insight drives reliable electricity generation and supports corporate sustainability goals and carbon reduction.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-6391\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-6391\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> What is the difference between GHI and GTI in solar forecasting? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 11.6351L31.5103 27.0167C32.1857 28.5487 33.3677 30.1421 35 31L33.1989 31C30.3846 31 27.8518 29.2228 26.6135 26.4652L20.8724 13.1671C20.8724 13.1671 20.591 12.6769 20.0844 12.7382C19.5779 12.7382 19.2964 13.1671 19.2964 13.1671L13.5553 26.4652C12.3734 29.2228 9.78424 31 6.96998 31L5 31C6.63227 30.1421 7.81426 28.5487 8.48968 27.0167L15.3002 11.6351C16.0882 9.61282 18.7899 9 19.9719 9C21.1538 9 23.8555 9.55153 24.6435 11.6351L24.6998 11.6351Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 28.3649L31.5103 12.9833C32.1857 11.4513 33.3677 9.85794 35 9L33.1989 9C30.3846 9 27.8518 10.7772 26.6135 13.5348L20.8724 26.8329C20.8724 26.8329 20.591 27.3231 20.0844 27.2618C19.5779 27.2618 19.2964 26.8329 19.2964 26.8329L13.5553 13.5348C12.3734 10.7772 9.78424 9 6.96998 9L5 9C6.63227 9.85794 7.81426 11.4513 8.48968 12.9833L15.3002 28.3649C16.0882 30.3872 18.7899 31 19.9719 31C21.1538 31 23.8555 30.4485 24.6435 28.3649L24.6998 28.3649Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-6391\" class=\"elementor-element elementor-element-5549ee73 e-con-full e-flex e-con e-child\" data-id=\"5549ee73\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1c24c0b6 elementor-widget elementor-widget-text-editor\" data-id=\"1c24c0b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><b>GHI<\/b><span style=\"font-weight: 400;\"> (Global Horizontal Irradiance) measures total solar radiation on horizontal surfaces, while <\/span><b>GTI<\/b><span style=\"font-weight: 400;\"> (Global Tilted Irradiance) measures radiation on panel-tilted surfaces &#8211; <\/span><b>the more relevant measurement for solar energy systems modeling<\/b><span style=\"font-weight: 400;\">. GTI derivation from GHI using transposition models enhances energy efficiency and design optimization for solar installations.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-6392\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-6392\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> Can accurate solar forecasting be achieved without on-site measurements?  <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 11.6351L31.5103 27.0167C32.1857 28.5487 33.3677 30.1421 35 31L33.1989 31C30.3846 31 27.8518 29.2228 26.6135 26.4652L20.8724 13.1671C20.8724 13.1671 20.591 12.6769 20.0844 12.7382C19.5779 12.7382 19.2964 13.1671 19.2964 13.1671L13.5553 26.4652C12.3734 29.2228 9.78424 31 6.96998 31L5 31C6.63227 30.1421 7.81426 28.5487 8.48968 27.0167L15.3002 11.6351C16.0882 9.61282 18.7899 9 19.9719 9C21.1538 9 23.8555 9.55153 24.6435 11.6351L24.6998 11.6351Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 28.3649L31.5103 12.9833C32.1857 11.4513 33.3677 9.85794 35 9L33.1989 9C30.3846 9 27.8518 10.7772 26.6135 13.5348L20.8724 26.8329C20.8724 26.8329 20.591 27.3231 20.0844 27.2618C19.5779 27.2618 19.2964 26.8329 19.2964 26.8329L13.5553 13.5348C12.3734 10.7772 9.78424 9 6.96998 9L5 9C6.63227 9.85794 7.81426 11.4513 8.48968 12.9833L15.3002 28.3649C16.0882 30.3872 18.7899 31 19.9719 31C21.1538 31 23.8555 30.4485 24.6435 28.3649L24.6998 28.3649Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-6392\" class=\"elementor-element elementor-element-14e9aa06 e-con-full e-flex e-con e-child\" data-id=\"14e9aa06\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3e89ac6d elementor-widget elementor-widget-text-editor\" data-id=\"3e89ac6d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Satellite and NWP models enable day-ahead forecasting, but at intraday horizons, absence of on-site data significantly limits accuracy: satellites cannot capture sub-kilometer variability or plant-specific energy production behavior &#8211; critical for grid reliability and cost control in growing electricity consumption segments.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-6393\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-6393\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> What happens to forecast quality when on-site data is temporarily unavailable? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 11.6351L31.5103 27.0167C32.1857 28.5487 33.3677 30.1421 35 31L33.1989 31C30.3846 31 27.8518 29.2228 26.6135 26.4652L20.8724 13.1671C20.8724 13.1671 20.591 12.6769 20.0844 12.7382C19.5779 12.7382 19.2964 13.1671 19.2964 13.1671L13.5553 26.4652C12.3734 29.2228 9.78424 31 6.96998 31L5 31C6.63227 30.1421 7.81426 28.5487 8.48968 27.0167L15.3002 11.6351C16.0882 9.61282 18.7899 9 19.9719 9C21.1538 9 23.8555 9.55153 24.6435 11.6351L24.6998 11.6351Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"40\" viewBox=\"0 0 40 40\" fill=\"none\"><path d=\"M24.6998 28.3649L31.5103 12.9833C32.1857 11.4513 33.3677 9.85794 35 9L33.1989 9C30.3846 9 27.8518 10.7772 26.6135 13.5348L20.8724 26.8329C20.8724 26.8329 20.591 27.3231 20.0844 27.2618C19.5779 27.2618 19.2964 26.8329 19.2964 26.8329L13.5553 13.5348C12.3734 10.7772 9.78424 9 6.96998 9L5 9C6.63227 9.85794 7.81426 11.4513 8.48968 12.9833L15.3002 28.3649C16.0882 30.3872 18.7899 31 19.9719 31C21.1538 31 23.8555 30.4485 24.6435 28.3649L24.6998 28.3649Z\" fill=\"currentColor\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-6393\" class=\"elementor-element elementor-element-7d243df e-con-full e-flex e-con e-child\" data-id=\"7d243df\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4b253da8 elementor-widget elementor-widget-text-editor\" data-id=\"4b253da8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">CalibSun&#8217;s NEXT algorithm operates seamlessly across data states. When measurements are interrupted, satellite and NWP inputs sustain forecast continuity without manual intervention, reducing short-term accuracy during gaps but recovering automatically &#8211; ensuring <\/span><b>reliable service<\/b><span style=\"font-weight: 400;\"> and <\/span><b>growing confidence<\/b><span style=\"font-weight: 400;\"> in <\/span><b>renewable energy deployment<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is on-site solar data and why does it matter for solar power forecasting?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"On-site solar data encompasses all ground measurements collected directly at photovoltaic installations: solar irradiance from pyranometers, electrical power output from SCADA systems, and meteorological variables. 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GTI derivation from GHI using transposition models enhances energy efficiency and design optimization for solar installations.\"}},{\"@type\":\"Question\",\"name\":\"Can accurate solar forecasting be achieved without on-site measurements?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Satellite and NWP models enable day-ahead forecasting, but at intraday horizons, absence of on-site data significantly limits accuracy: satellites cannot capture sub-kilometer variability or plant-specific energy production behavior &#8211; critical for grid reliability and cost control in growing electricity consumption segments.\"}},{\"@type\":\"Question\",\"name\":\"What happens to forecast quality when on-site data is temporarily unavailable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"CalibSun&#8217;s NEXT algorithm operates seamlessly across data states. When measurements are interrupted, satellite and NWP inputs sustain forecast continuity without manual intervention, reducing short-term accuracy during gaps but recovering automatically &#8211; ensuring reliable service and growing confidence in renewable energy deployment.\"}}]}<\/script>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Calibsun | Expertise On-Site Solar Data: The primary source of truth for accurate power forecasting Introduction On-site solar data refers to all ground-based measurements collected directly at a photovoltaic power plant (irradiance, power output, temperature, wind) to monitor real weather conditions in real time. For solar power forecasting, these in situ measurements are not a [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":43,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-54","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/pages\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/comments?post=54"}],"version-history":[{"count":0,"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/pages\/54\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/pages\/43"}],"wp:attachment":[{"href":"https:\/\/www.calibsun.com\/fr\/wp-json\/wp\/v2\/media?parent=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}