{"id":7586,"date":"2026-07-30T10:55:43","date_gmt":"2026-07-30T02:55:43","guid":{"rendered":"https:\/\/hobertek.com\/how-to-size-a-solar-pump-inverter-the-engineering-guide-to-ac-pump-solarization-2026\/"},"modified":"2026-07-30T10:55:43","modified_gmt":"2026-07-30T02:55:43","slug":"how-to-size-a-solar-pump-inverter-the-engineering-guide-to-ac-pump-solarization-2026","status":"publish","type":"post","link":"https:\/\/hobertek.com\/fr\/how-to-size-a-solar-pump-inverter-the-engineering-guide-to-ac-pump-solarization-2026\/","title":{"rendered":"Comment dimensionner un onduleur pour pompe solaire\u00a0: Guide technique de la solarisation des pompes \u00e0 courant alternatif (2026)"},"content":{"rendered":"<p><strong>To correctly size a solar pump inverter for an existing AC pump, you must match the inverter\u2019s Rated Output Current to the motor\u2019s Full Load Amps (FLA), typically applying a 1.15x safety margin. Sizing by kW alone is a common field error that leads to premature IGBT failure. Additionally, the PV array configuration must ensure the Vmp stays within the inverter&#8217;s MPPT window while the Voc never exceeds the maximum DC input voltage at the site\u2019s lowest temperature.<\/strong><\/p>\n<h2>Step 1: The &#8220;Current Over Power&#8221; Rule<\/h2>\n<p>In the field, we often see installers matching a 7.5kW inverter to a 7.5kW pump and wondering why it trips on overcurrent.<\/p>\n<p><strong>La v\u00e9rit\u00e9:<\/strong> Power ratings are nominal. The real work is done by current. If your pump&#8217;s FLA (Full Load Amps) is 15A, your inverter must be able to deliver that current continuously under solar fluctuations.<\/p>\n<ul>\n<li><strong>The Formula:<\/strong> Inverter Output Current (A) &ge; Motor Rated Current (A) &times; 1.15<\/li>\n<li><strong>Why?<\/strong> Solar inputs are variable. High-inertia starts or slight mechanical wear on the pump can cause current spikes. If your inverter doesn&#8217;t have the &#8220;headroom,&#8221; it will trigger protection or burn out.<\/li>\n<\/ul>\n<h2>Step 2: PV Array Voltage Windows (Voc vs. Vmp)<\/h2>\n<p>A solar pump inverter is not a battery charger; it\u2019s a high-speed MPPT driver. Efficiency depends entirely on voltage matching.<\/p>\n<ul>\n<li><strong>Vmp (Voltage at Maximum Power):<\/strong> Your string\u2019s combined Vmp must be at the center of the inverter&#8217;s MPPT range (e.g., 530V-580V for a 380V AC system) to ensure 100% pump frequency even during passing clouds.<\/li>\n<li><strong>Voc (Open Circuit Voltage):<\/strong> <strong>Never<\/strong> design your string to hit more than 90% of the inverter&#8217;s max DC input. If the inverter max is 800V, keep your Voc below 720V. Cold mornings in regions like the Middle East or Andes can spike Voc by 10-15%, instantly frying the input capacitors.<\/li>\n<\/ul>\n<h2>Step 3: The Site-Specific &#8220;Correction Factors&#8221;<\/h2>\n<p>Standard data sheets assume 25&deg;C and sea level. Real-world engineering doesn&#8217;t. HOBER inverters are built for extreme environments, but physics still applies.<\/p>\n<ol>\n<li><strong>High Altitude (&gt;3000m):<\/strong> Thin air means poor heat dissipation. In cities like La Paz or high-altitude Peru, you must <strong>over-size the inverter by one power rating<\/strong> (e.g., use an 11kW inverter for a 7.5kW pump) to compensate for derating.<\/li>\n<li><strong>Extreme Heat (50&deg;C+):<\/strong> If your site hits 50&deg;C (Pakistan, Sudan), fan-cooled units will fail. You need a <strong>Architecture \u00e0 triple refroidissement<\/strong> (Sealed IP65 + External Heatsinks + Forced Air) to maintain 50Hz output.<\/li>\n<\/ol>\n<h3>Quick Sizing Reference Table (B2B Standard)<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; border: 1px solid #ddd;\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th style=\"padding: 12px; border: 1px solid #ddd;\">Puissance de la pompe<\/th>\n<th style=\"padding: 12px; border: 1px solid #ddd;\">Motor Phase<\/th>\n<th style=\"padding: 12px; border: 1px solid #ddd;\">Onduleur recommand\u00e9<\/th>\n<th style=\"padding: 12px; border: 1px solid #ddd;\">Min. PV Power<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>2.2kW \/ 3HP<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">3-Phase 220V<\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">2.2kW &#8211; 3.7kW<\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">3.3kWp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>7.5kW \/ 10HP<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">triphas\u00e9 380 V<\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">7.5kW &#8211; 11kW<\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">11.2kWp<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>15kW \/ 20HP<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">triphas\u00e9 380 V<\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">15kW &#8211; 18.5kW<\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">22.5kWp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Step 4: The Long Cable Hazard<\/h2>\n<p>If your borehole is deeper than 100m, the voltage drop and reflected wave phenomenon will destroy your motor&#8217;s insulation.<\/p>\n<ul>\n<li><strong>Engineering Rule:<\/strong>\n<ul>\n<li><strong>100m &#8211; 200m:<\/strong> Install an Output Reactor.<\/li>\n<li><strong>&gt;200m:<\/strong> Install a Sine Wave Filter.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>HOBER IP65 inverters are designed to handle these inductive loads, but protection is non-negotiable for system longevity.<\/p>\n<hr \/>\n<h2>Looking for a Professional System Selection?<\/h2>\n<p>The logic above is for preliminary sizing. For complete Bill of Materials (BOM), string configurations, and dealer-exclusive pricing for your specific project, visit our Academy.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/hobertek.com\/fr\/ac-pump-solarization-academy\/\" class=\"button\">Visit AC Pump Solarization Academy<\/a><\/p>\n<hr \/>\n<h3>FAQ for Solar Pump Inverter Sizing<\/h3>\n<div class=\"faq-section\">\n<p><strong>Q: Can I use a single-phase inverter for a three-phase pump?<\/strong><br \/>A: No. The output phase and voltage of the inverter must match the motor nameplate. Using HOBER hybrid inverters allows you to convert single-phase PV input into three-phase output for standard pumps.<\/p>\n<p><strong>Q: How do I handle 500HP+ loads?<\/strong><br \/>A: For large-scale irrigation (citrus orchards, etc.), we use industrial control cabinets with 1130A+ input capacity and multi-drive synchronization. Contact our engineering team for high-power technical packs.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Pour dimensionner correctement un onduleur de pompe solaire pour une pompe \u00e0 courant alternatif existante, vous devez faire correspondre le courant de sortie nominal de l&#039;onduleur \u00e0 l&#039;amp\u00e9rage \u00e0 pleine charge du moteur.<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>","protected":false},"author":4,"featured_media":7513,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","om_disable_all_campaigns":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"_joinchat":[],"footnotes":"","jetpack_post_was_ever_published":false},"categories":[76,212],"tags":[266,281,168],"class_list":["post-7586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-pump-inverter","category-solutions","tag-ac-pump-solarization","tag-hybrid-pumping","tag-sizing"],"jetpack_featured_media_url":"https:\/\/hobertek.com\/wp-content\/uploads\/2026\/07\/Hober-Solar-Pump-Inverter-IP65-Cooling-Test-in-Saudi-Arabia.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/posts\/7586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/comments?post=7586"}],"version-history":[{"count":0,"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/posts\/7586\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/media\/7513"}],"wp:attachment":[{"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/media?parent=7586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/categories?post=7586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hobertek.com\/fr\/wp-json\/wp\/v2\/tags?post=7586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}