{"id":4892,"date":"2025-08-21T08:32:43","date_gmt":"2025-08-21T06:32:43","guid":{"rendered":"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/"},"modified":"2025-08-21T08:32:43","modified_gmt":"2025-08-21T06:32:43","slug":"1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus","status":"publish","type":"post","link":"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/","title":{"rendered":"1 amp\u00e8re = combien de watts ? Convertisseur 12 V, 24 V et 230 V inclus"},"content":{"rendered":"<p>Vous cherchez la relation directe entre amp\u00e8res et watts pour vos \u00e9quipements nomades ? \u27a1\ufe0f <strong>1 amp\u00e8re correspond \u00e0 12 W sous 12 V, 24 W sous 24 V et 230 W sous 230 V<\/strong> (si le facteur de puissance est de 1). Ce calcul express \u00e9vite la surcharge de vos c\u00e2bles et convertisseurs, qu\u2019il s\u2019agisse d\u2019une glaci\u00e8re dans un van ou d\u2019un onduleur domestique.<\/p>\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sommaire<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/#convertir-amperes-en-watts-formules-tableau-et-cas-concrets\" >Convertir amp\u00e8res en watts : formules, tableau et cas concrets<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/#exemple-de-calcul-la-glaciere-dun-vanlifer\" >Exemple de calcul : la glaci\u00e8re d\u2019un vanlifer<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/#bien-utiliser-un-convertisseur-12-v-24-v-ou-230-v-sur-batterie-nomade\" >Bien utiliser un convertisseur 12 V, 24 V ou 230 V sur batterie nomade<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/#cas-pratique-station-lifepo4-convertisseur\" >Cas pratique : station LiFePO4 + convertisseur<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/#choisir-la-station-electrique-ideale-et-son-ecosysteme\" >Choisir la station \u00e9lectrique id\u00e9ale et son \u00e9cosyst\u00e8me<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/stationnomade.com\/blog\/1-ampere-combien-de-watts-convertisseur-12-v-24-v-et-230-v-inclus\/#questions-frequentes-sur-la-conversion-amperewatt\" >Questions fr\u00e9quentes sur la conversion amp\u00e8re\/watt<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"convertir-amperes-en-watts-formules-tableau-et-cas-concrets\"><\/span>Convertir amp\u00e8res en watts : formules, tableau et cas concrets<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p>La loi de Joule r\u00e9sume tout : <strong>P (W) = I (A) \u00d7 V (V)<\/strong> en courant continu, et <strong>P = I \u00d7 V \u00d7 PF<\/strong> en courant alternatif. \ud83d\udcd0 Un simple multiplicateur suffit dans 90 % des usages nomades.<\/p>\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\ud83d\udd0c Tension<\/th>\n<th>\ud83c\udfaf 1 A \u27f6 W (PF = 1)<\/th>\n<th>\ud83d\udca1 Exemples d\u2019appareils<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>12 V CC<\/td>\n<td>12 W \u26a1<\/td>\n<td>\u00c9clairage LED, frigo 12 V<\/td>\n<\/tr>\n<tr>\n<td>24 V CC<\/td>\n<td>24 W \u26a1\u26a1<\/td>\n<td>Pompe \u00e0 eau, chargeur d\u2019outils<\/td>\n<\/tr>\n<tr>\n<td>230 V AC<\/td>\n<td>230 W \u26a1\u26a1\u26a1<\/td>\n<td>Micro-ondes, bouilloire de voyage<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<ul class=\"wp-block-list\"><li>\ud83e\uddee Pour une tension diff\u00e9rente, multipliez simplement : 1,5 A \u00d7 12 V = 18 W.<\/li><li>\ud83d\udd04 <em>AC monophas\u00e9<\/em> : ajoutez le facteur de puissance (PF). Exemple : 1 A \u00d7 230 V \u00d7 0,8 = 184 W.<\/li><li>\u2699\ufe0f Pour de l\u2019AC triphas\u00e9 : <strong>\u221a3<\/strong> entre en jeu : P = \u221a3 \u00d7 I \u00d7 V \u00d7 PF.<\/li><\/ul>\n\n<p>Les marques comme Legrand ou Schneider Electric rappellent dans leurs catalogues 2025 qu\u2019un dimensionnement correct \u00e9vite la chauffe des conducteurs et prolonge la dur\u00e9e de vie des prises.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1344\" height=\"768\" src=\"https:\/\/stationnomade.com\/blog\/wp-content\/uploads\/2025\/08\/1-ampere-combien-de-watts-Convertisseur-12-V-24-V-et-230-V-inclus-1.jpg\" alt=\"d\u00e9couvrez combien de watts repr\u00e9sente 1 amp\u00e8re selon diff\u00e9rentes tensions (12v, 24v, 230v). utilisez notre convertisseur pratique pour faciliter vos calculs et comprendre la relation entre amp\u00e8res et watts.\" class=\"wp-image-4891\" srcset=\"https:\/\/stationnomade.com\/blog\/wp-content\/uploads\/2025\/08\/1-ampere-combien-de-watts-Convertisseur-12-V-24-V-et-230-V-inclus-1.jpg 1344w, https:\/\/stationnomade.com\/blog\/wp-content\/uploads\/2025\/08\/1-ampere-combien-de-watts-Convertisseur-12-V-24-V-et-230-V-inclus-1-300x171.jpg 300w, https:\/\/stationnomade.com\/blog\/wp-content\/uploads\/2025\/08\/1-ampere-combien-de-watts-Convertisseur-12-V-24-V-et-230-V-inclus-1-1024x585.jpg 1024w, https:\/\/stationnomade.com\/blog\/wp-content\/uploads\/2025\/08\/1-ampere-combien-de-watts-Convertisseur-12-V-24-V-et-230-V-inclus-1-768x439.jpg 768w\" sizes=\"auto, (max-width: 1344px) 100vw, 1344px\" \/><\/figure>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"exemple-de-calcul-la-glaciere-dun-vanlifer\"><\/span>Exemple de calcul : la glaci\u00e8re d\u2019un vanlifer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p>Alex, vanlifer, utilise un compresseur 12 V \/ 5 A : 5 A \u00d7 12 V = 60 W. Avec une station de 500 Wh, il tiendra 8 h sans soleil. Pour optimiser, il installe un panneau  \u2014 voir le guide complet <a href=\"https:\/\/stationnomade.com\/blog\/panneau-solaire-van-fonctionnement\/\">sur le fonctionnement des panneaux solaires en van<\/a>.<\/p>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=W1bZLI25MLA\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"220V AC to 3V, 9V, 12V, 18V, 24V, 40V, 60V, 80V, 120V DC auto volt converter\" title=\"Play video &quot;220V AC to 3V, 9V, 12V, 18V, 24V, 40V, 60V, 80V, 120V DC auto volt converter&quot;\">https:\/\/www.youtube.com\/watch?v=W1bZLI25MLA<\/a><noscript>Video can&rsquo;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=W1bZLI25MLA\" title=\"220V AC to 3V, 9V, 12V, 18V, 24V, 40V, 60V, 80V, 120V DC auto volt converter\">220V AC to 3V, 9V, 12V, 18V, 24V, 40V, 60V, 80V, 120V DC auto volt converter (https:\/\/www.youtube.com\/watch?v=W1bZLI25MLA)<\/a><\/noscript><\/div>\n<\/div><\/figure>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"bien-utiliser-un-convertisseur-12-v-24-v-ou-230-v-sur-batterie-nomade\"><\/span>Bien utiliser un convertisseur 12 V, 24 V ou 230 V sur batterie nomade<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p>Choisir la bonne tension limite les pertes et prot\u00e8ge la batterie <a href=\"https:\/\/stationnomade.com\/blog\/profondeur-de-decharge-dod\/\">en profondeur de d\u00e9charge<\/a>. Les fabricants Siemens, Hager ou Finder proposent des convertisseurs \u00e0 haut rendement (&gt; 92 %) adapt\u00e9s aux stations portables.<\/p>\n\n<ul class=\"wp-block-list\"><li>\ud83d\udd0c 12 V \u27a1\ufe0f Id\u00e9al pour l\u2019\u00e9clairage et les frigos r\u00e9gul\u00e9s.<\/li><li>\ud83d\udd0b 24 V \u27a1\ufe0f R\u00e9duit l\u2019intensit\u00e9 dans les c\u00e2bles longs, pratique pour les fourgons rallong\u00e9s.<\/li><li>\u26a1 230 V \u27a1\ufe0f Permet d\u2019utiliser une cafeti\u00e8re Philips ou un fer \u00e0 repasser domestique.<\/li><\/ul>\n\n<p>Attention au c\u00e2blage : un fil trop fin s\u2019\u00e9chauffe. Les r\u00e9f\u00e9rences Voltcraft ou Eaton indiquent clairement l\u2019amp\u00e9rage maximum. Voici un pense-b\u00eate :<\/p>\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>Section cuivre (mm\u00b2)<\/th>\n<th>Intensit\u00e9 continue s\u00fbre<\/th>\n<th>Longueur max (2 %)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>2,5<\/td>\n<td>21 A \ud83d\ude03<\/td>\n<td>4 m sous 12 V<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>42 A \ud83d\ude42<\/td>\n<td>7 m sous 12 V<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>100 A \ud83d\udcaa<\/td>\n<td>10 m sous 24 V<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<ul class=\"wp-block-list\"><li>\ud83d\udd17 Tutoriel connecteurs MC4 : <a href=\"https:\/\/stationnomade.com\/blog\/connecteurs-mc4-definition\/\">ici<\/a> pour brancher vos panneaux.<\/li><li>\u26a1 Port Anderson : <a href=\"https:\/\/stationnomade.com\/blog\/port-anderson-utilite-prise\/\">d\u00e9cryptage<\/a> des 50 A sans \u00e9chauffement.<\/li><li>\u26a1 Port XT60 : <a href=\"https:\/\/stationnomade.com\/blog\/port-xt60-definition-compatibilite\/\">guide<\/a> pour drones et stations compactes.<\/li><\/ul>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=zvg0giMrVyY\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"Easy Voltage Reduction: 24V to 12V with Resistors\" title=\"Play video &quot;Easy Voltage Reduction: 24V to 12V with Resistors&quot;\">https:\/\/www.youtube.com\/watch?v=zvg0giMrVyY<\/a><noscript>Video can&rsquo;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=zvg0giMrVyY\" title=\"Easy Voltage Reduction: 24V to 12V with Resistors\">Easy Voltage Reduction: 24V to 12V with Resistors (https:\/\/www.youtube.com\/watch?v=zvg0giMrVyY)<\/a><\/noscript><\/div>\n<\/div><\/figure>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"cas-pratique-station-lifepo4-convertisseur\"><\/span>Cas pratique : station LiFePO4 + convertisseur<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p>Une batterie <a href=\"https:\/\/stationnomade.com\/blog\/batterie-lifepo4-avantages\/\">LiFePO4<\/a> 100 Ah d\u00e9livre 1 200 Wh. Sous 24 V, le courant est divis\u00e9 par deux, prolongeant la dur\u00e9e de vie des relais ABB ou Merlin Gerin int\u00e9gr\u00e9s \u00e0 certains mod\u00e8les premium.<\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"choisir-la-station-electrique-ideale-et-son-ecosysteme\"><\/span>Choisir la station \u00e9lectrique id\u00e9ale et son \u00e9cosyst\u00e8me<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p>Pour s\u00e9lectionner la bonne capacit\u00e9, partez de la puissance totale en watts, puis appliquez : <strong>Capacit\u00e9 (Wh) = Puissance \u00d7 Dur\u00e9e \/ Rendement<\/strong>. Le simulateur interne de Station Nomade aide chaque profil :<\/p>\n\n<ul class=\"wp-block-list\"><li>\ud83d\ude90 Vanlifer : 700 W \u00d7 8 h = 5 600 Wh \u27a1\ufe0f station 6 kWh + panneaux pliables.<\/li><li>\ud83c\udfd5\ufe0f Campeur : 60 W \u00d7 2 h = 120 Wh \u27a1\ufe0f batterie 300 Wh ultral\u00e9g\u00e8re.<\/li><li>\ud83c\udfe0 Backup r\u00e9sidentiel : 400 W essentiels \u00d7 4 h = 1 600 Wh \u27a1\ufe0f station 2 kWh Schneider Electric.<\/li><\/ul>\n\n<p>Analysez aussi :<\/p>\n\n<ol class=\"wp-block-list\"><li>\ud83d\udd04 Vitesse de recharge (USB-C PD : <a href=\"https:\/\/stationnomade.com\/blog\/port-usb-c-pd-usage\/\">explications<\/a>).<\/li><li>\ud83c\udf9b\ufe0f Modularit\u00e9 des prises : AC pur sinus, 12 V r\u00e9gul\u00e9, USB-A.<\/li><li>\ud83d\udee1\ufe0f Garantie : Siemens ou Legrand offrent parfois 5 ans sur les convertisseurs.<\/li><\/ol>\n\n<p>Utilisez notre calculateur en ligne pour \u00e9viter une sous-dimension : <a href=\"https:\/\/stationnomade.com\/blog\/capacite-stockage-batterie\/\">m\u00e9thode compl\u00e8te<\/a>.<\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"questions-frequentes-sur-la-conversion-amperewatt\"><\/span>Questions fr\u00e9quentes sur la conversion amp\u00e8re\/watt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p><strong>1. Comment passer rapidement de watts \u00e0 amp\u00e8res ?<\/strong><br>Divisez les watts par la tension (et par le PF en AC). 120 W sous 24 V DC : 120 \/ 24 = 5 A. \u2705<\/p>\n\n<p><strong>2. 10 A sous 12 V suffisent-ils pour un micro-ondes ?<\/strong><br>Non : 10 A \u00d7 12 V = 120 W, alors qu\u2019un micro-ondes exige ~700 W. Pr\u00e9voyez un convertisseur 230 V \/ 1 000 W.<\/p>\n\n<p><strong>3. Le facteur de puissance varie-t-il avec le temps ?<\/strong><br>Oui, les moteurs ou compresseurs vieillissent ; un PF de 0,9 peut tomber \u00e0 0,7, d\u2019o\u00f9 l\u2019int\u00e9r\u00eat des compteurs intelligents Hager pour surveiller.<\/p>\n\n<p><strong>4. Puis-je m\u00e9langer 12 V et 24 V sur la m\u00eame installation ?<\/strong><br>Uniquement avec un convertisseur abaisseur\/\u00e9l\u00e9vateur certifi\u00e9 Eaton ou Voltcraft, sinon risque de court-circuit.<\/p>\n\n<p><strong>5. Une batterie LiFePO4 est-elle meilleure qu\u2019une AGM pour les m\u00eames watts ?<\/strong><br>Oui : densit\u00e9 \u00e9nerg\u00e9tique plus \u00e9lev\u00e9e, 3 000 cycles, et tol\u00e9rance \u00e0 la d\u00e9charge profonde. Voir le comparatif d\u00e9taill\u00e9 dans <a href=\"https:\/\/stationnomade.com\/blog\/batterie-auxiliaire-van\/\">les batteries auxiliaires pour van<\/a>.<\/p>\n\n<p>En r\u00e9sum\u00e9, <strong>1 amp\u00e8re = combien de watts<\/strong> ? La r\u00e9ponse d\u00e9pend simplement de la tension et du facteur de puissance. Arm\u00e9 de ces formules express et des bons accessoires, toute installation \u2014 du road-trip en 2025 \u00e0 l\u2019atelier connect\u00e9 \u2014 devient plus s\u00fbre et plus efficace. \u26a1\ud83d\ude90<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Vous cherchez la relation directe entre amp\u00e8res et watts pour vos \u00e9quipements nomades ? \u27a1\ufe0f 1 amp\u00e8re correspond \u00e0 12&#8230;<\/p>\n","protected":false},"author":13,"featured_media":4890,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[64],"tags":[],"class_list":["post-4892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides-pratiques"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u25b7 1 amp\u00e8re = combien de watts ? 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