{"id":43375,"date":"2026-09-12T15:58:01","date_gmt":"2026-09-12T13:58:01","guid":{"rendered":"https:\/\/fvcomponentes.com\/calculadora-seccion-cable\/"},"modified":"2026-09-12T16:24:20","modified_gmt":"2026-09-12T14:24:20","slug":"rechner-fur-den-kabelbereich","status":"publish","type":"page","link":"https:\/\/fvcomponentes.com\/de\/calculadora-seccion-cable\/","title":{"rendered":"Kabelquerschnittsrechner f\u00fcr Solaranlagen (DC und AC)"},"content":{"rendered":"\n<style>\n.fvt{max-width:980px;margin:0 auto;font-size:16px}\n.fvt .card{background:#fff;border:1px solid #E3E9EF;border-radius:16px;padding:22px;margin:0 0 22px;box-shadow:0 1px 3px rgba(10,76,122,.06)}\n.fvt h2{color:#0A4C7A;font-size:22px;margin:0 0 14px;padding-bottom:8px;position:relative}\n.fvt h2::after{content:\"\";position:absolute;left:0;bottom:0;width:46px;height:3px;background:#EF6B16}\n.fvt .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}\n.fvt label{display:block;font-size:13px;color:#4B5563;margin-bottom:4px;font-weight:600}\n.fvt input,.fvt select{width:100%;padding:10px 12px;border:1px solid #D1D5DB;border-radius:10px;font-size:15px;background:#fff}\n.fvt .btn{display:inline-block;background:#EF6B16;color:#fff;border:0;padding:12px 24px;border-radius:12px;font-weight:600;cursor:pointer;margin-top:16px;font-size:16px}\n.fvt .res{background:#F5F8FB;border-radius:12px;padding:18px;margin-top:18px;display:none}\n.fvt .res.on{display:block}\n.fvt .big{font-size:30px;font-weight:800;color:#0A4C7A}\n.fvt .ok{color:#15803D;font-weight:600}.fvt .ko{color:#B91C1C;font-weight:600}.fvt .warn{color:#B45309;font-weight:600}\n.fvt table{width:100%;border-collapse:collapse;margin-top:10px;font-size:14px}\n.fvt th{background:#0A4C7A;color:#fff;text-align:left;padding:8px}.fvt td{padding:8px;border-bottom:1px solid #EEF2F6}\n.fvt small{color:#6B7280}\n.fvt .cta{margin-top:24px;background:#0A4C7A;color:#fff;border-radius:16px;padding:22px;text-align:center}\n.fvt .cta a{display:inline-block;margin:8px 6px 0;background:#EF6B16;color:#fff;padding:10px 20px;border-radius:12px;text-decoration:none;font-weight:600}\n<\/style><div class=\"fvt\">\n<div class=\"card\"><p>Calcula la <strong>secci\u00f3n m\u00ednima de cable<\/strong> de cobre para el tramo entre paneles y regulador, bater\u00eda e inversor o inversor y cuadro, seg\u00fan la corriente, la longitud y la ca\u00edda de tensi\u00f3n que admites. Devuelve la secci\u00f3n normalizada, la ca\u00edda real, la corriente admisible orientativa y el fusible recomendado.<\/p><\/div>\n<div class=\"card\"><h2>Datos del tramo<\/h2><div class=\"grid\">\n<div><label>Tipo de circuito<\/label><select id=\"c_tipo\"><option value=\"dc\">Corriente continua (paneles, bater\u00eda)<\/option><option value=\"ac1\">AC monof\u00e1sico 230 V<\/option><option value=\"ac3\">AC trif\u00e1sico 400 V<\/option><\/select><\/div>\n<div><label>Tensi\u00f3n (V)<\/label><input id=\"c_v\" type=\"number\" value=\"48\" step=\"0.1\"><\/div>\n<div><label>Potencia (W) <small>o deja 0 y pon la corriente<\/small><\/label><input id=\"c_p\" type=\"number\" value=\"5000\"><\/div>\n<div><label>Corriente (A) <small>si no indicas potencia<\/small><\/label><input id=\"c_i\" type=\"number\" value=\"0\" step=\"0.1\"><\/div>\n<div><label>Longitud del tramo (m, solo ida)<\/label><input id=\"c_l\" type=\"number\" value=\"3\" step=\"0.1\"><\/div>\n<div><label>Ca\u00edda de tensi\u00f3n m\u00e1xima (%)<\/label><select id=\"c_dv\"><option value=\"1\">1 % (bater\u00eda\u2013inversor, recomendado)<\/option><option value=\"1.5\">1,5 % (paneles\u2013regulador)<\/option><option value=\"2\">2 % (bater\u00eda\u2013inversor en 12 V)<\/option><option value=\"3\">3 % (AC, cargas)<\/option><option value=\"5\">5 %<\/option><\/select><\/div>\n<div><label>Factor de seguridad sobre la corriente<\/label><select id=\"c_fs\"><option value=\"1.25\">1,25 (fotovoltaica, recomendado)<\/option><option value=\"1\">1,00<\/option><\/select><\/div>\n<div><label>Temperatura del conductor<\/label><select id=\"c_t\"><option value=\"0.0225\">70 \u00b0C (PVC \/ uso general)<\/option><option value=\"0.0242\">90 \u00b0C (XLPE \/ cable solar)<\/option><option value=\"0.0178\">20 \u00b0C (te\u00f3rico)<\/option><\/select><\/div>\n<\/div><button class=\"btn\" onclick=\"calcCable()\">Calcular secci\u00f3n<\/button>\n<div class=\"res\" id=\"c_res\"><\/div><\/div>\n<div class=\"card\"><h2>C\u00f3mo se calcula<\/h2>\n<p>La secci\u00f3n por ca\u00edda de tensi\u00f3n es <strong>S = 2 \u00b7 L \u00b7 I \u00b7 \u03c1 \/ \u0394V<\/strong> en continua y monof\u00e1sica (ida y vuelta) y <strong>S = \u221a3 \u00b7 L \u00b7 I \u00b7 \u03c1 \/ \u0394V<\/strong> en trif\u00e1sica, con \u03c1 la resistividad del cobre a la temperatura de trabajo. Despu\u00e9s se elige la secci\u00f3n normalizada inmediatamente superior y se comprueba que la corriente admisible del cable supere la corriente de c\u00e1lculo. En fotovoltaica, la corriente de los paneles se mayora un 25 % (la irradiancia puede superar los 1000 W\/m\u00b2).<\/p>\n<h2>Regla Victron para cables de bater\u00eda<\/h2>\n<p>Para el tramo bater\u00eda\u2013inversor\/cargador de hasta 5 m, Victron aplica una regla sencilla: <strong>la intensidad m\u00e1xima admisible es el doble de la secci\u00f3n en mm\u00b2<\/strong> (35 mm\u00b2 \u2192 70 A, 50 mm\u00b2 \u2192 100 A, 70 mm\u00b2 \u2192 140 A, 95 mm\u00b2 \u2192 190 A). Se aplica sobre la corriente nominal del inversor (potencia en VA \u00f7 tensi\u00f3n de bater\u00eda), sin el factor 1,25 de fotovoltaica, y reproduce la tabla del manual del MultiPlus-II: 48\/3000 \u2192 35 mm\u00b2, 48\/5000 \u2192 70 mm\u00b2, 48\/8000 \u2192 2\u00d750 mm\u00b2, 48\/15000 \u2192 2\u00d795 mm\u00b2. La calculadora la aplica autom\u00e1ticamente en circuitos DC de hasta 5 m y elige la mayor de las dos secciones (regla Victron o ca\u00edda de tensi\u00f3n). A 12 V y potencias altas manda la ca\u00edda de tensi\u00f3n, no la regla. El fusible debe ser el del manual del equipo (\u2248 2,9 A por mm\u00b2 de cable).<\/p>\n<h2>Valores habituales<\/h2>\n<ul><li>Bater\u00eda\u2013inversor 48 V \/ 5000 W a 2 m: 35-50 mm\u00b2 con ca\u00edda del 1 %.<\/li><li>Bater\u00eda\u2013inversor 12 V \/ 3000 W a 1,5 m: 70-95 mm\u00b2. En 12 V los cables son enormes: por eso los sistemas grandes van a 24 o 48 V.<\/li><li>String de paneles (10 A, 600 V) a 30 m: 4-6 mm\u00b2 de cable solar H1Z2Z2-K.<\/li><li>Inversor 5 kW monof\u00e1sico al cuadro a 15 m: 6 mm\u00b2 (ca\u00edda \u22481 %).<\/li><\/ul>\n<p>Para la secci\u00f3n de cable de bater\u00eda en equipos Victron consulta tambi\u00e9n la tabla de secciones recomendadas del manual de cada MultiPlus, y lee <a href=\"https:\/\/fvcomponentes.com\/como-calcular-la-seccion-de-un-cable\/\">c\u00f3mo calcular la secci\u00f3n de un cable<\/a>.<\/p><\/div>\n<div class=\"cta\"><strong>\u00bfDudas con el resultado?<\/strong><br>Nuestro soporte t\u00e9cnico es gratuito para clientes.<br><a href=\"https:\/\/fvcomponentes.com\/categoria-producto\/material-electrico\/cables-electricos\/\">Cables el\u00e9ctricos<\/a><a href=\"https:\/\/fvcomponentes.com\/categoria-producto\/material-electrico\/fusibles\/\">Fusibles<\/a><a href=\"https:\/\/fvcomponentes.com\/soporte-tecnico\/\">Soporte t\u00e9cnico<\/a><\/div>\n<\/div>\n<script>\nconst SEC=[1.5,2.5,4,6,10,16,25,35,50,70,95,120,150,185,240];\nconst AMP={1.5:17,2.5:24,4:32,6:41,10:57,16:76,25:101,35:125,50:151,70:192,95:232,120:269,150:309,185:353,240:415};\nconst FUS=[2,4,6,10,16,20,25,32,40,50,63,80,100,125,160,200,250,315,400,500];\nfunction calcCable(){\n const tipo=c_tipo.value, V=+c_v.value, P=+c_p.value, L=+c_l.value, dv=+c_dv.value\/100, fs=+c_fs.value, rho=+c_t.value;\n let I=+c_i.value; const cos=0.95;\n if(P>0){ I= tipo==='dc'?P\/V : tipo==='ac1'?P\/(V*cos) : P\/(Math.sqrt(3)*V*cos); }\n if(!(I>0)||!(V>0)||!(L>0)){c_res.innerHTML='<span class=\"ko\">Revisa los datos.<\/span>';c_res.classList.add('on');return;}\n const Id=I*fs; const k= tipo==='ac3'?Math.sqrt(3):2;\n const Smin= k*L*Id*rho\/(dv*V);\n let S=SEC.find(s=>s>=Smin)||240; let fuse=FUS.find(f=>f>=Id)||'\u2014'; const need=(fuse==='\u2014')?Id:Math.max(Id,fuse); while(S<240){ if(AMP[S]>=need) break; S=SEC[SEC.indexOf(S)+1]; }\n let vicNote='';\n if(tipo==='dc'){ if(L<=5){ const Sv=SEC.find(x=>x>=I\/2)||240; if(Sv>S){S=Sv;} vicNote=`<p><strong>Regla Victron (cable bater\u00eda\u2013inversor hasta 5 m):<\/strong> intensidad m\u00e1xima = 2 \u00d7 secci\u00f3n, aplicada sobre la corriente nominal del equipo (${I.toFixed(0)} A, sin mayorar). Secci\u00f3n m\u00ednima: <strong>${Sv} mm\u00b2<\/strong>. Coincide con la tabla del manual MultiPlus-II (48\/3000 \u2192 35 mm\u00b2, 48\/5000 \u2192 70 mm\u00b2, 48\/15000 \u2192 2\u00d795 mm\u00b2). Se elige la mayor entre esta secci\u00f3n y la de ca\u00edda de tensi\u00f3n. En equipos Victron usa el <strong>fusible que indica el manual<\/strong> (p. ej. 125 A en 48\/3000, 200 A en 48\/5000, 400 A en 48\/10000), superior al m\u00ednimo calculado aqu\u00ed.<\/p>`; } }\n const dvReal=k*L*Id*rho\/S; const pct=dvReal\/V*100;\n c_res.innerHTML=`<div class=\"big\">${S} mm\u00b2<\/div>\n <p>Corriente de c\u00e1lculo: <strong>${Id.toFixed(1)} A<\/strong> (${I.toFixed(1)} A \u00d7 ${fs}). Secci\u00f3n te\u00f3rica m\u00ednima por ca\u00edda de tensi\u00f3n: ${Smin.toFixed(2)} mm\u00b2.<\/p>\n <p>Ca\u00edda de tensi\u00f3n real con ${S} mm\u00b2: <strong>${dvReal.toFixed(2)} V (${pct.toFixed(2)} %)<\/strong>. Corriente admisible orientativa del cable: ${AMP[S]} A.<\/p>\n ${vicNote}\n <p>Fusible \/ magnetot\u00e9rmico recomendado: <strong>${fuse} A<\/strong> <small>(mayor o igual que la corriente de c\u00e1lculo y menor que la admisible del cable)<\/small>.<\/p>\n <p><small>C\u00e1lculo con resistividad del cobre a la temperatura elegida y longitud de ida y vuelta. Las intensidades admisibles son orientativas (cable de cobre al aire, m\u00e9todo B1\/E); en canalizaci\u00f3n enterrada, agrupamiento o alta temperatura ambiente aplica los factores de correcci\u00f3n del REBT (ITC-BT-19 \/ ITC-BT-40).<\/small><\/p>`;\n c_res.classList.add('on');\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Calcula la secci\u00f3n m\u00ednima de cable de cobre para el tramo entre paneles y regulador, bater\u00eda e inversor o inversor y cuadro, seg\u00fan la corriente, la longitud y la ca\u00edda de tensi\u00f3n que admites. Devuelve la secci\u00f3n normalizada, la ca\u00edda real, la corriente admisible orientativa y el fusible recomendado. Datos del tramo Tipo de circuitoCorriente [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-43375","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/pages\/43375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/comments?post=43375"}],"version-history":[{"count":4,"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/pages\/43375\/revisions"}],"predecessor-version":[{"id":43389,"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/pages\/43375\/revisions\/43389"}],"wp:attachment":[{"href":"https:\/\/fvcomponentes.com\/de\/wp-json\/wp\/v2\/media?parent=43375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}