{"id":18501,"date":"2024-11-20T13:18:49","date_gmt":"2024-11-20T12:18:49","guid":{"rendered":"https:\/\/cubeconcepts.de\/?p=18501"},"modified":"2026-06-01T13:44:24","modified_gmt":"2026-06-01T11:44:24","slug":"repowering-of-pv-systems","status":"publish","type":"post","link":"https:\/\/cubeconcepts.de\/en\/repowering-von-pv-anlagen\/","title":{"rendered":"Repowering of PV systems: When is modernization worthwhile?"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><em>(Updated April 2026)<\/em> Repowering of PV systems replaces old, inefficient components with modern technology to increase yield and profitability. Typical measures include module replacement, new inverters, and optimized cabling \u2013 often <strong>with 20\u201350 %, higher power output<\/strong> on the same area.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This post shows when repowering is profitable, what funding rules will apply in 2026, and how companies can achieve maximum benefit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is repowering for PV systems?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When repowering, older photovoltaic systems are modernized without rebuilding the entire system. The goal is to <strong>maximize efficiency<\/strong> and to utilize the remaining service life economically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Measures<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Replacement of old modules (250\u2013350 Wp) with 450\u2013600 Wp models<\/li>\n\n\n\n<li>Modernization of inverters (higher efficiency, better MPP tracking)<\/li>\n\n\n\n<li>Optimization of Cabling and String Design<\/li>\n\n\n\n<li>Integration of Energy Management Systems (EMS)<\/li>\n\n\n\n<li>Retrofitting tracker systems for ground-mounted systems<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When is repowering worthwhile?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Repowering is worthwhile for plants starting at&nbsp;<strong>10\u201312 years<\/strong>&nbsp;Meaning, especially when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Performance Ratio &lt; 80 %<\/strong>&nbsp;(typical for older systems)<\/li>\n\n\n\n<li><strong>Modules &lt; 18 % Efficiency<\/strong>&nbsp;(vs. 22\u201324 % current)<\/li>\n\n\n\n<li><strong>Remaining term of EEG remuneration &gt; 5 years<\/strong><\/li>\n\n\n\n<li><strong>Planned roof renovation<\/strong>&nbsp;or building renovation<\/li>\n\n\n\n<li><strong>High electricity prices<\/strong>&nbsp;make self-consumption more attractive<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rule of thumb<\/strong>: In the event of yield losses &gt; 15% due to <a href=\"https:\/\/cubeconcepts.de\/en\/degradation-of-pv-systems-is-actually-much-lower-than-long-assumed\/\" type=\"post\" id=\"27390\">Degradation<\/a> Repowering usually pays for itself within 3-5 years.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Yield increase through modern technology<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">According to the International Technology Roadmap for Photovoltaics (ITRPV), the average module efficiency increased by approximately 0.56% annually between 2011 and 2021. If this trend continues, efficiency levels of 26 to 30% could be achievable for standard modules over the next 10 to 15 years. Consequently, replacing older modules and inverters can generate significantly higher PV yields per square meter today. Here is a rough overview:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Time period<\/strong><\/td><td><strong>Efficiency<\/strong><\/td><td><strong>Performance\/m\u00b2<\/strong><\/td><td><strong>Yield increase<\/strong><\/td><\/tr><tr><td>2005-2010<\/td><td>14\u201316 %<\/td><td>140\u2013160 Wp<\/td><td>\u2013<\/td><\/tr><tr><td>2015<\/td><td>17\u201319 %<\/td><td>170-190 Wp<\/td><td>+15\u201320 %<\/td><\/tr><tr><td>2020<\/td><td>19\u201321 %<\/td><td>190-210 Wp<\/td><td>+25\u201335 %<\/td><\/tr><tr><td>2026<\/td><td>22\u201325 %<\/td><td>220\u2013250 Wp<\/td><td>+40\u201360 %<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example<\/strong>: A 1,000 kWp system (2010) with 80 % PR modules will be upgraded to 140\u2013160 kWp (95 % PR modules) through repowering \u2013&nbsp;<strong>+60 % Revenue<\/strong>&nbsp;at the same area.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Advantages of repowering PV systems<\/h2>\n\n\n\n<h3 id=\"technische-verbesserungen\" class=\"wp-block-heading\">Technical improvements<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Higher module power<\/strong>: 350 Wp \u2192 550 Wp per module<\/li>\n\n\n\n<li><strong>Better inverters<\/strong>: 98% % efficiency vs. 94\u201396% %<\/li>\n\n\n\n<li><strong>Fewer string losses<\/strong>&nbsp;through optimized wiring<\/li>\n\n\n\n<li><strong>EMS Integration<\/strong>&nbsp;for <a href=\"https:\/\/cubeconcepts.de\/en\/self-consumption-optimization-through-better\/\" type=\"post\" id=\"27842\">Self-consumption optimization<\/a><\/li>\n<\/ul>\n\n\n\n<h3 id=\"wirtschaftliche-vorteile\" class=\"wp-block-heading\">Economic advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Amortization<\/strong>3\u20135 years for self-consumption<\/li>\n\n\n\n<li><strong>EEG compensation<\/strong>&nbsp;remains proportionately preserved<\/li>\n\n\n\n<li><strong>Additional performance<\/strong>&nbsp;as a new plant (20 years)<\/li>\n\n\n\n<li><strong>Appreciation<\/strong>&nbsp;the property<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Regulatory relief<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The&nbsp;<strong><a href=\"https:\/\/cubeconcepts.de\/en\/solar-package-at-critical-points-continues-to-be-blocked\/\" type=\"post\" id=\"24388\">Solar package I<\/a> (since 2024)<\/strong>&nbsp;makes repowering significantly more attractive:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>EEG remuneration remains on module exchange <\/li>\n\n\n\n<li>Additional work = New installation (20 years remuneration) <\/li>\n\n\n\n<li>No proof of damage required anymore <\/li>\n\n\n\n<li>Simplified direct marketing<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Costs &amp; Economic Efficiency<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical repowering costs<\/strong>&nbsp;(1.000 kWp system):<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Measure<\/strong><\/td><td><strong>Costs<\/strong><\/td><td><strong>Yield increase<\/strong><\/td><\/tr><tr><td>Module<\/td><td>400.000 \u20ac<\/td><td>+ 30-50 %<\/td><\/tr><tr><td>Inverter<\/td><td>150.000 \u20ac<\/td><td>+ 5-10 %<\/td><\/tr><tr><td>Cabling<\/td><td>50.000 \u20ac<\/td><td>+ 3-5 %<\/td><\/tr><tr><td>EMS<\/td><td>20.000 \u20ac<\/td><td>+ 10\u201320 % Own consumption<\/td><\/tr><tr><td><strong>Total<\/strong><\/td><td><strong>620.000 \u20ac<\/strong><\/td><td><strong>+ 50\u201380 % yield<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Return on Investment<\/strong>3\u20135 years for self-consumption, 5\u20137 years for feed-in.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Legal Framework 2026<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The repowering of photovoltaic systems was supported by the <strong><a href=\"https:\/\/cubeconcepts.de\/en\/solar-package-i-new-impetus-for-the-energy-transition\/\">Solar package 1<\/a><\/strong>which has been in force since May 2024. With the aim of accelerating the expansion of solar energy, the 2023 amendment to the EEG provides for simplified approval procedures and financial incentives. The key points of the legal changes are<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Module Replacement within Approved Performance: EEG Remuneration Remains in Place<\/li>\n\n\n\n<li>Performance increase: Additional performance = New installation (20-year compensation) <\/li>\n\n\n\n<li>No proof of defect required <\/li>\n\n\n\n<li>Joint billing possible<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important prerequisites: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Client remains the same<\/li>\n\n\n\n<li>Network operators inform<\/li>\n\n\n\n<li>Document technical acceptance<\/li>\n\n\n\n<li><a href=\"https:\/\/cubeconcepts.de\/en\/the-market-participant-data-register-mastr\/\" type=\"post\" id=\"27301\">Market master data register<\/a> update<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Step-by-step: Implementing Repowering<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Current situation analysis<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Performance Ratio <\/li>\n\n\n\n<li>Module inspection (Defects, shading) <\/li>\n\n\n\n<li>Inverter check <\/li>\n\n\n\n<li>Load Profile Analysis (Self-Consumption)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Economic Feasibility Analysis<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Expected added return vs. investment costs <\/li>\n\n\n\n<li>EEG operating duration vs. self-consumption potential <\/li>\n\n\n\n<li>Check funding options<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Check Funding<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>KfW 270: Renewable Energies (Grant Eligible) <\/li>\n\n\n\n<li>BAFA: Energy Consulting (50\u201380 % Grant) <\/li>\n\n\n\n<li>Regional Subsidies (by Federal State) <\/li>\n\n\n\n<li><a href=\"https:\/\/cubeconcepts.de\/en\/innovation-tender\/\">Innovation tenders<\/a> (mostly only in conjunction with battery storage)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Technical Inspection<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recalculate module type and string design<\/li>\n\n\n\n<li>Adjust inverter size<\/li>\n\n\n\n<li>Integrate EMS for self-consumption<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Permits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Network operators inform <\/li>\n\n\n\n<li>EEG adjustment (for increased performance) <\/li>\n\n\n\n<li>Update fire protection concept<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6. Implementation &amp; Commissioning<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Phased dismantling\/assembly <\/li>\n\n\n\n<li>Technical acceptance <\/li>\n\n\n\n<li>EEG registration (for additional services)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When is repowering not yet worthwhile?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Performance Ratio &gt; 85%<\/li>\n\n\n\n<li>Remaining term EEG &lt; 3 years<\/li>\n\n\n\n<li>Very low electricity prices<\/li>\n\n\n\n<li>Planned complete roof renovation<\/li>\n\n\n\n<li>High shading \/ location problems<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: Repowering as an investment in the remaining service life<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Repowering maximizes the potential of existing PV systems. Modern modules, inverters, and EMS systems increase output by 40\u201380%, while the Solar Package I minimizes legal hurdles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check now<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Contact the specialist partner<\/li>\n\n\n\n<li>Measure the performance ratio of your system<\/li>\n\n\n\n<li>Create a feasibility study.<\/li>\n\n\n\n<li>Evaluate EEG runtime<\/li>\n<\/ul>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/cubeconcepts.de\/en\/knowledge\/fachbeitraege\/\">Back to overview<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>By replacing inverters and modules and integrating an EMS, the performance ratio can be increased to as high as 95%. After 10\u201312 years of operation, this upgrade is particularly worthwhile for maximizing self-consumption, reducing grid costs, and strategically leveraging the system\u2019s remaining lifespan as a \u201eyield booster.\u201c.<\/p>","protected":false},"author":3,"featured_media":18503,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61,25],"tags":[],"class_list":["post-18501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-grundlagen-technik","category-photovoltaik"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Repowering von PV-Anlagen: Wann lohnt sich die Modernisierung? | CUBE CONCEPTS<\/title>\n<meta name=\"description\" content=\"PV-Repowering: Module, Wechselrichter, EMS \u2013 Ertragssteigerung, Kosten, EEG-Regeln, Wirtschaftlichkeit f\u00fcr Unternehmen.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cubeconcepts.de\/en\/repowering-of-pv-systems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Repowering von PV-Anlagen: Wann lohnt sich die Modernisierung? 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