{"id":1022957,"date":"2026-01-22T10:11:37","date_gmt":"2026-01-22T04:41:37","guid":{"rendered":"https:\/\/blog.otthydromet.com\/?p=1022957"},"modified":"2026-01-22T19:24:35","modified_gmt":"2026-01-22T13:54:35","slug":"reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction","status":"publish","type":"post","link":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/","title":{"rendered":"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &#038; Construction"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1022957\" class=\"elementor elementor-1022957\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3e0a7ec elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3e0a7ec\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9489674\" data-id=\"9489674\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dff4f65 elementor-drop-cap-yes elementor-drop-cap-view-default elementor-widget elementor-widget-text-editor\" data-id=\"dff4f65\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;drop_cap&quot;:&quot;yes&quot;}\" 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><span class=\"TextRun SCXW40409641 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW40409641 BCX0\">Accurate irradiance data is\u00a0<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">the backbone<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">\u00a0<\/span><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW40409641 BCX0\">of<\/span><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW40409641 BCX0\">\u00a0 solar<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">\u00a0project performance, bankability, and long<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">&#8211;<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">term investor confidence<\/span><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW40409641 BCX0\">\u00a0For<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">\u00a0EPCs, it shapes everything from yield assessments and energy modeling to commissioning acceptance tests and contractual guarantees. But this reliability depends on a critical assumption:<strong>\u00a0<\/strong><\/span><\/span><strong><span class=\"TextRun SCXW40409641 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW40409641 BCX0\">the irradiance measurements used to\u00a0<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">validate<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">\u00a0performance are\u00a0<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">accurate<\/span><span class=\"NormalTextRun SCXW40409641 BCX0\">.<\/span><\/span><span class=\"EOP SCXW40409641 BCX0\" data-ccp-props=\"{}\">\u00a0<\/span><\/strong><\/p><p><span style=\"letter-spacing: 0.1px;\">Even the most advanced pyranometers are exposed to environmental, mechanical, and user-induced influences that introduce error. Understanding these sources, and controlling them during design and construction, helps EPCs minimize uncertainty, avoid avoidable PR disputes, and safeguard their reputation for technical excellence.<\/span><\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f885d1c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f885d1c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fe8894b\" data-id=\"fe8894b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b7315e5 elementor-widget elementor-widget-heading\" data-id=\"b7315e5\" 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\">Why Small Measurement Errors Create Big Financial Impacts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3df271a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3df271a\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-db95abc\" data-id=\"db95abc\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8defa1e elementor-widget elementor-widget-text-editor\" data-id=\"8defa1e\" 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>A small deviation in <a href=\"https:\/\/earth.gsfc.nasa.gov\/climate\/projects\/solar-irradiance\/about\">irradiance<\/a> accuracy can translate into major financial consequences over the life of a PV plant. For example, a \u00a0<strong>4% Performance Ratio (PR)<\/strong> \u00a0deviation at a 64\u00a0MW site can result in more than <strong>$1.8 million in lost revenue over 30 years<\/strong>. Even fractional errors can cascade into issues like:<\/p><ul><li>Missaligned performance guarantees<\/li><li>Unexpected EPC warranty exposure<\/li><li>Incorrect Yield model validation<\/li><li>Faulty Investor reporting<\/li><li>Poor SCADA \u2011based operational decisions<\/li><\/ul><p>For EPCs,\u00a0 <strong>irradiance accuracy is not just a technical requirement &#8211; it&#8217;s a risk management imperative.<\/strong><\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-dbd4827 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"dbd4827\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-dd699cc\" data-id=\"dd699cc\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a002961 elementor-widget elementor-widget-image\" data-id=\"a002961\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"418\" src=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Financial_Impact_PV_PR_Difference-768x418.jpg\" class=\"attachment-medium_large size-medium_large wp-image-1022965\" alt=\"Financial Impage of a PV site with a different in PR of 4%\" srcset=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Financial_Impact_PV_PR_Difference-768x418.jpg 768w, https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Financial_Impact_PV_PR_Difference-300x163.jpg 300w, https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Financial_Impact_PV_PR_Difference.jpg 788w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Financial impact ofa PV site with a different in PR of 4%<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\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-378e56b elementor-widget elementor-widget-heading\" data-id=\"378e56b\" 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<h3 class=\"elementor-heading-title elementor-size-default\">Manufacturer Related Sensor Errors: The Baseline EPCs Must Understand<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a0901fa elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a0901fa\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8c2ae42\" data-id=\"8c2ae42\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-658f9c5 elementor-widget elementor-widget-text-editor\" data-id=\"658f9c5\" 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>Modern <a href=\"https:\/\/www.otthydromet.com\/en\/products\/pyranometers?origin=dropdown&amp;c1=products&amp;c2=solar-instruments&amp;c3=pyranometers&amp;clickedon=pyranometers#classapyranometers\">ISO 9060:2018 Class A pyranometers<\/a> have significantly reduced design intrinsic uncertainty, and innovation for over nearly a century. With \u00a0quartz domes, fast response thermopiles, digital temperature compensation, and improved calibration methods, pyranometers have pushed irradiance accuracy closer to physical limits. Still, several baseline error sources remain<\/p><ol><li><strong>Directional \/ Cosine Response<\/strong><\/li><\/ol><p>Sensors do not respond equally to all angles of incoming radiation. Errors are highest at low sun angles, precisely the conditions where siting and alignment mistakes compound.<\/p><ol start=\"2\"><li><strong>Spectral Error<\/strong><\/li><\/ol><p>Changes in the solar spectrum (clouds, aerosols, humidity) interact with sensor materials. Quartz domes minimize this, but EPCs should still expect slight variations under unusual atmospheric conditions.<\/p><ol start=\"3\"><li><strong>Temperature Coefficient<\/strong><\/li><\/ol><p>All thermopile pyranometers drift slightly with temperature. High quality instruments compensate electronically, but they cannot fully eliminate this behavior.<\/p><ol start=\"4\"><li><strong>Nonlinearity<\/strong><\/li><\/ol><p>At the extremes of irradiance (very low or very high), output voltage does not scale perfectly with input light.<\/p><ol start=\"5\"><li><strong>Calibration Uncertainty &amp; Long- Term Drift<\/strong><\/li><\/ol><p>Even ISO accredited calibrations include small uncertainty margins, and sensors naturally drift over years. EPCs should account for recalibration schedules in project documentation.<\/p><p>Together, these form the baseline uncertainty EPCs need to factor into PR guarantees and model assumptions.<\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-cce8b87 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"cce8b87\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-cd9539c\" data-id=\"cd9539c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a819093 elementor-widget elementor-widget-heading\" data-id=\"a819093\" 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\">User Induced Errors: The Most Common, and Most Preventable Source of EPC Measurement Issues<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-841243c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"841243c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2b769ed\" data-id=\"2b769ed\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3c798d7 elementor-widget elementor-widget-image\" data-id=\"3c798d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/elementor\/thumbs\/DSC04313-scaled-rhznpltwzhi914ihzlkue3wf5gj9f1bojrluzml5oi.jpg\" title=\"DSC04313\" alt=\"Intalling pyranometer\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Installation of a pyranometer<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ad4b141 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ad4b141\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-177464f\" data-id=\"177464f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fbfec74 elementor-widget elementor-widget-text-editor\" data-id=\"fbfec74\" 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>Field research consistently shows that <strong>installation and handling errors contribute to more uncertainty than the sensor itself<\/strong>. These errors are fully within EPC control.<\/p><ol><li><strong>Soiling<\/strong><\/li><\/ol><p>Dust, pollen, bird droppings, and construction debris all reduce irradiance transmission. Even short\u2011term <a href=\"https:\/\/www.researchgate.net\/publication\/381157205_Mitigating_the_Impact_of_Soiling_on_Performance_and_Capacity_Testing_Using_Optimized_Soiling_Measurement_Strategies\">soiling<\/a> can skew early PR measurements.<\/p><ol start=\"2\"><li><strong>Leveling &amp; Tilt Misalignment<\/strong><\/li><\/ol><p>A pyranometer intended for GHI must be perfectly level.<br \/>A POA sensor must match the module tilt within <strong>&lt;0.5\u00b0<\/strong>.<\/p><p>A single degree of misalignment can create <strong>up to 20% relative error<\/strong> at low sun angles, large enough to trigger false underperformance claims.<\/p><ol start=\"3\"><li><strong>Improper Siting &amp; Placement<\/strong><\/li><\/ol><p>Incorrect placement, edge rows, atypical modules, or inconsistent tracker positions, can introduce <strong>up to 7.6% variability<\/strong> across the same site.<br \/>EPCs should standardize siting rules <em>before<\/em> construction begins.<\/p><ol start=\"4\"><li><strong>Shading<\/strong><\/li><\/ol><p>Cable trays, conduit, tracker motors, combiner boxes, or even temporary construction infrastructure can cast micro\u2011shadows that distort PR.<\/p><ol start=\"5\"><li><strong>Dew &amp; Frost<\/strong><\/li><\/ol><p>Cold morning dew increases diffuse radiation, temporarily inflating readings. Heated domes prevent this effect and improve early\u2011day data.<\/p><ol start=\"6\"><li><strong>Mechanical Shock or Transport Damage<\/strong><\/li><\/ol><p>Sensors mishandled during construction, shipping, or installation can develop small internal misalignments not visible to the eye &#8211; yet impactful.<\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-31fc6e2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"31fc6e2\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-48a97d4\" data-id=\"48a97d4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fb20f6e elementor-widget elementor-widget-heading\" data-id=\"fb20f6e\" 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\">Environmental &amp; Operational Influences EPCs Should Expect<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f3ecc07 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f3ecc07\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-57e1dc7\" data-id=\"57e1dc7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8021c8d elementor-widget elementor-widget-text-editor\" data-id=\"8021c8d\" 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>Even with perfect installation, natural conditions can temporarily affect pyranometer output:<\/p><p><strong>Rapid Temperature Changes- <\/strong>Thermopile sensors rely on heat flow, making them sensitive to strong temperature gradients.<\/p><p><strong>Atmospheric Spectral Shifts &#8211;<\/strong>Clouds, aerosols, or wildfire smoke alter spectral distribution; even spectrally flat sensors are not immune.<\/p><p><strong>Wind Effects &#8211; <\/strong>While domes protect the detector, strong gusts can still influence temperature differentials.<\/p><p>High quality <a href=\"https:\/\/www.otthydromet.com\/en\/products\/pyranometers?origin=dropdown&amp;c1=products&amp;c2=solar-instruments&amp;c3=pyranometers&amp;clickedon=pyranometers\">pyranometers<\/a> mitigate these effects, but EPCs should recognize that environmental variability is inherent to solar measurement .<\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ceb8950 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ceb8950\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-df13085\" data-id=\"df13085\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8bed9ed elementor-widget elementor-widget-heading\" data-id=\"8bed9ed\" 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\">How EPCs Can Reduce Pyranometer Error<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3d1a42e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3d1a42e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d568139\" data-id=\"d568139\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3191e10 elementor-widget elementor-widget-image\" data-id=\"3191e10\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/elementor\/thumbs\/AdobeStock_1634430088-rhz930ow8sncthesvz91izo2mg0l7et5heh873d3ia.jpeg\" title=\"quick checklist to reduce pyranometer error\" alt=\"quick checklist to reduce pyranometer error\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Checklist to increase irradiance accuracy<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\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-295d285 elementor-widget elementor-widget-text-editor\" data-id=\"295d285\" 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>The most effective strategies are neither expensive nor complex, they simply require consistency, planning, and quality control.<\/p><p><strong>\u2714<\/strong><strong> Specify the Right Accuracy Class<\/strong><\/p><p>Choose ISO 9060:2018 Class A pyranometers. These reduce design intrinsic uncertainty to the lowest practical levels and \u00a0should be standard for bankable EPC projects.<\/p><p><strong>\u2714<\/strong><strong> Install with Precision<\/strong><\/p><ul><li>Level GHI sensors using bubble levels accurate to 0.1\u00b0<\/li><li>Match POA tilt precisely to module tilt (&lt;0.5\u00b0)<\/li><li>Avoid edge rows and non\u2011representative modules<\/li><li>Route cables and conduit to avoid any shading risk<\/li><\/ul><p><strong>\u2714 Maintain Throughout Construction &amp; Commissioning<\/strong><\/p><ul><li>Keep domes clean (dust, paint spray, construction dirt)<\/li><li>Inspect for accidental shading from temporary structures<\/li><li>Verify alignment regularly, especially on trackers<\/li><li>Document calibration dates and plan for long\u2011term recalibration<\/li><\/ul><p><strong>\u2714<\/strong><strong> Use Heating or Ventilation Where Climate Requires It<\/strong><\/p><p>Integrated dome heaters prevent dew\/frost bias in cold or humid climates.<\/p><p><strong>\u2714<\/strong><strong> Validate Data Early<\/strong><\/p><p>Unexpected patterns during commissioning often indicate siting or installation issues, not sensor flaws.<\/p><p>These steps cost little, but they significantly reduce uncertainty and help EPCs hand over a plant with fully validated, high quality <a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/irradiance\">irradiance<\/a> data.<\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d7949d2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d7949d2\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9b59fa5\" data-id=\"9b59fa5\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ff0c923 elementor-widget elementor-widget-heading\" data-id=\"ff0c923\" 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<h3 class=\"elementor-heading-title elementor-size-default\">Why This Matters for EPC Project Success<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b96a383 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b96a383\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6cc3a7f\" data-id=\"6cc3a7f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0f284ff elementor-widget elementor-widget-text-editor\" data-id=\"0f284ff\" 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>Well-designed and well-installed irradiance measurement systems:<\/p><ul><li>Protect EPCs from disputes during commissioning<\/li><li>Reduce the risk of PR guarantee claims<\/li><li>Strengthen investor confidence and model credibility<\/li><li>Ensure that any future underperformance can be correctly attributed<\/li><\/ul><p>Simply put: <strong>accuracy today prevents costly conversations tomorrow.<\/strong><\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-57e1f1f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"57e1f1f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ad65e77\" data-id=\"ad65e77\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-62b5c10 elementor-widget elementor-widget-heading\" data-id=\"62b5c10\" 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<h3 class=\"elementor-heading-title elementor-size-default\">Conclusion: Accuracy Is a Shared Responsibility<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6a69d5e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6a69d5e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4c0e18d\" data-id=\"4c0e18d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f50b3b1 elementor-widget elementor-widget-text-editor\" data-id=\"f50b3b1\" 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>Manufacturers have spent decades reducing intrinsic sensor limits, but <strong>EPCs exert the greates influence on real world irradiance accuracy<\/strong>. By applying proper siting, installation discipline, and environmental awareness, EPCs can ensure that pyranometer data reflects true onsite conditions, supporting fair PR validation, reliable yield modeling, and longterm project success.<\/p><p><span data-teams=\"true\">Ready to see these strategies in action? Download the visual guide to optimizing pyranometer accuracy and boosting your solar project\u2019s performance.\u00a0<\/span><\/p>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ddb6497 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ddb6497\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2975a2d\" data-id=\"2975a2d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-85a112e elementor-align-center elementor-widget elementor-widget-button\" data-id=\"85a112e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/cdn.hach.com\/1XMCM0ZF\/at\/rvcjcp5cfn843s8fm3mcqs\/Reducing_Pyranometer_Error.pdf\">\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\">Download the Pyranometer Error Reduction Infographic<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Accurate irradiance data is\u00a0the backbone\u00a0of\u00a0 solar\u00a0project performance, bankability, and long-term investor confidence\u00a0For\u00a0EPCs, it shapes everything from yield assessments and energy modeling to commissioning acceptance tests and contractual guarantees. But this reliability depends on a critical assumption:\u00a0the irradiance measurements used to\u00a0validate\u00a0performance are\u00a0accurate.\u00a0 Even the most advanced pyranometers are exposed to environmental, mechanical, and user-induced influences that [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1022959,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-1022957","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solarenergy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &amp; Construction - OTT Blog<\/title>\n<meta name=\"description\" content=\"Discover practical EPC strategies to reduce pyranometer error, improve irradiance accuracy, and ensure reliable solar project performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &amp; Construction - OTT Blog\" \/>\n<meta property=\"og:description\" content=\"Discover practical EPC strategies to reduce pyranometer error, improve irradiance accuracy, and ensure reliable solar project performance.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\" \/>\n<meta property=\"og:site_name\" content=\"OTT Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-22T04:41:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-22T13:54:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1707\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Ela Jozsef\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ela Jozsef\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\"},\"author\":{\"name\":\"Ela Jozsef\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#\/schema\/person\/ed8bcb38a462068acffdcc3e845662dd\"},\"headline\":\"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &#038; Construction\",\"datePublished\":\"2026-01-22T04:41:37+00:00\",\"dateModified\":\"2026-01-22T13:54:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\"},\"wordCount\":1015,\"publisher\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#organization\"},\"image\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg\",\"articleSection\":[\"Solar Energy\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\",\"url\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\",\"name\":\"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting & Construction - OTT Blog\",\"isPartOf\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg\",\"datePublished\":\"2026-01-22T04:41:37+00:00\",\"dateModified\":\"2026-01-22T13:54:35+00:00\",\"description\":\"Discover practical EPC strategies to reduce pyranometer error, improve irradiance accuracy, and ensure reliable solar project performance.\",\"breadcrumb\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage\",\"url\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg\",\"contentUrl\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg\",\"width\":2560,\"height\":1707,\"caption\":\"Reducing Pyranometer Error\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Startseite\",\"item\":\"https:\/\/blog.otthydromet.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &#038; Construction\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#website\",\"url\":\"https:\/\/blog.otthydromet.com\/en\/\",\"name\":\"OTT Blog\",\"description\":\"HydroMet\",\"publisher\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blog.otthydromet.com\/en\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#organization\",\"name\":\"OTT HydroMet\",\"url\":\"https:\/\/blog.otthydromet.com\/en\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2020\/07\/ottblog_logo.svg\",\"contentUrl\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2020\/07\/ottblog_logo.svg\",\"width\":176,\"height\":60,\"caption\":\"OTT HydroMet\"},\"image\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#\/schema\/person\/ed8bcb38a462068acffdcc3e845662dd\",\"name\":\"Ela Jozsef\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2025\/12\/Ela_Jozsef-e1766999932910-150x150.jpeg\",\"url\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2025\/12\/Ela_Jozsef-e1766999932910-150x150.jpeg\",\"contentUrl\":\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2025\/12\/Ela_Jozsef-e1766999932910-150x150.jpeg\",\"caption\":\"Ela Jozsef\"},\"description\":\"As a Senior Manager, Strategic Communications &amp; Campaigns at OTT HydroMet, I focus on creating stories and campaigns about water, weather, and sun that show why reliable data matters.\",\"url\":\"https:\/\/blog.otthydromet.com\/en\/author\/elajozsef\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting & Construction - OTT Blog","description":"Discover practical EPC strategies to reduce pyranometer error, improve irradiance accuracy, and ensure reliable solar project performance.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/","og_locale":"en_US","og_type":"article","og_title":"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting & Construction - OTT Blog","og_description":"Discover practical EPC strategies to reduce pyranometer error, improve irradiance accuracy, and ensure reliable solar project performance.","og_url":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/","og_site_name":"OTT Blog","article_published_time":"2026-01-22T04:41:37+00:00","article_modified_time":"2026-01-22T13:54:35+00:00","og_image":[{"width":2560,"height":1707,"url":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg","type":"image\/jpeg"}],"author":"Ela Jozsef","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Ela Jozsef","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#article","isPartOf":{"@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/"},"author":{"name":"Ela Jozsef","@id":"https:\/\/blog.otthydromet.com\/en\/#\/schema\/person\/ed8bcb38a462068acffdcc3e845662dd"},"headline":"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &#038; Construction","datePublished":"2026-01-22T04:41:37+00:00","dateModified":"2026-01-22T13:54:35+00:00","mainEntityOfPage":{"@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/"},"wordCount":1015,"publisher":{"@id":"https:\/\/blog.otthydromet.com\/en\/#organization"},"image":{"@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage"},"thumbnailUrl":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg","articleSection":["Solar Energy"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/","url":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/","name":"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting & Construction - OTT Blog","isPartOf":{"@id":"https:\/\/blog.otthydromet.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage"},"image":{"@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage"},"thumbnailUrl":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg","datePublished":"2026-01-22T04:41:37+00:00","dateModified":"2026-01-22T13:54:35+00:00","description":"Discover practical EPC strategies to reduce pyranometer error, improve irradiance accuracy, and ensure reliable solar project performance.","breadcrumb":{"@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#primaryimage","url":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg","contentUrl":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2026\/01\/Pyranometer_SMP_CMP-scaled.jpeg","width":2560,"height":1707,"caption":"Reducing Pyranometer Error"},{"@type":"BreadcrumbList","@id":"https:\/\/blog.otthydromet.com\/en\/reducing-pyranometer-error-why-irradiance-accuracy-starts-in-plant-design-siting-construction\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Startseite","item":"https:\/\/blog.otthydromet.com\/en\/"},{"@type":"ListItem","position":2,"name":"Reducing Pyranometer Error: Why Irradiance Accuracy Starts in Plant Design, Siting &#038; Construction"}]},{"@type":"WebSite","@id":"https:\/\/blog.otthydromet.com\/en\/#website","url":"https:\/\/blog.otthydromet.com\/en\/","name":"OTT Blog","description":"HydroMet","publisher":{"@id":"https:\/\/blog.otthydromet.com\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blog.otthydromet.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/blog.otthydromet.com\/en\/#organization","name":"OTT HydroMet","url":"https:\/\/blog.otthydromet.com\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/blog.otthydromet.com\/en\/#\/schema\/logo\/image\/","url":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2020\/07\/ottblog_logo.svg","contentUrl":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2020\/07\/ottblog_logo.svg","width":176,"height":60,"caption":"OTT HydroMet"},"image":{"@id":"https:\/\/blog.otthydromet.com\/en\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/blog.otthydromet.com\/en\/#\/schema\/person\/ed8bcb38a462068acffdcc3e845662dd","name":"Ela Jozsef","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2025\/12\/Ela_Jozsef-e1766999932910-150x150.jpeg","url":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2025\/12\/Ela_Jozsef-e1766999932910-150x150.jpeg","contentUrl":"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2025\/12\/Ela_Jozsef-e1766999932910-150x150.jpeg","caption":"Ela Jozsef"},"description":"As a Senior Manager, Strategic Communications &amp; Campaigns at OTT HydroMet, I focus on creating stories and campaigns about water, weather, and sun that show why reliable data matters.","url":"https:\/\/blog.otthydromet.com\/en\/author\/elajozsef\/"}]}},"_links":{"self":[{"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/posts\/1022957","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/comments?post=1022957"}],"version-history":[{"count":0,"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/posts\/1022957\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/media\/1022959"}],"wp:attachment":[{"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/media?parent=1022957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/categories?post=1022957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.otthydromet.com\/en\/wp-json\/wp\/v2\/tags?post=1022957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}