{"id":20734,"date":"2026-11-03T10:09:38","date_gmt":"2026-11-03T02:09:38","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/inverter-ac-extension-lead-load-voltage\/"},"modified":"2026-11-03T10:09:38","modified_gmt":"2026-11-03T02:09:38","slug":"inverter-ac-extension-lead-load-voltage","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/","title":{"rendered":"AC Extension Leads on an Inverter: Check Voltage at the Load"},"content":{"rendered":"<figure class=\"hero\"><a href=\"https:\/\/www.wehopower.com\/fr\/product\/600w-12v-24v-48v-dc-ac-110v-220v-pure-sine-wave-power-inverter\/\"><img decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/hero-9.webp\" alt=\"AC Extension Leads on an Inverter: Check Voltage at the Load  title=\" fetchpriority=\"high\" ac extension leads on an inverter: check voltage at the load title=\"\"><\/a><figcaption>AI-assisted application illustration with original WHP-600 family artwork. The visible cable route is not a receiver-voltage measurement; concealed DC connections, complete protection and connector suitability remain unverified.<\/figcaption><a class=\"original-link\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/original-2.jpg\">View original product image<\/a><\/figure>\n<p><strong>Check the voltage where the AC load receives power, as well as at the inverter outlet, under the same operating condition.<\/strong> An extension lead adds conductor and connection impedance. A correct outlet voltage can coexist with an unacceptable voltage at the remote appliance.<\/p>\n<p>This guide gives an integrator an AC-side route calculation and observation record using the <a href=\"https:\/\/www.wehopower.com\/fr\/product\/600w-12v-24v-48v-dc-ac-110v-220v-pure-sine-wave-power-inverter\/\">WEHO WHP600W family<\/a> as a product reference. It does not replace battery-cable design or establish that an arbitrary reel, adapter or appliance is suitable.<\/p>\n<nav class=\"toc\" aria-label=\"On this page\">\n<ol>\n<li><a href=\"#define-ac-route\">Define the complete AC extension route<\/a><\/li>\n<li><a href=\"#resistance-screen\">Calculate a resistance screen with clear assumptions<\/a><\/li>\n<li><a href=\"#product-boundary\">Keep the inverter and lead limits separate<\/a><\/li>\n<li><a href=\"#measure-two-locations\">Compare both endpoints during a controlled load state<\/a><\/li>\n<li><a href=\"#route-release\">Release the exact extension configuration<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"define-ac-route\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 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\">Table des mati\u00e8res<\/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;\">Basculer<\/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' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Define_the_complete_AC_extension_route\" >Define the complete AC extension route<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Calculate_a_resistance_screen_with_clear_assumptions\" >Calculate a resistance screen with clear assumptions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Keep_the_inverter_and_lead_limits_separate\" >Keep the inverter and lead limits separate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Compare_both_endpoints_during_a_controlled_load_state\" >Compare both endpoints during a controlled load state<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Release_the_exact_extension_configuration\" >Release the exact extension configuration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Send_the_AC_route_and_receiver_conditions\" >Send the AC route and receiver conditions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#AC_extension_endpoint-voltage_record\" >AC extension endpoint-voltage record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/fr\/news\/inverter-ac-extension-lead-load-voltage\/#Sources_and_further_reading\" >Sources and further reading<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Define_the_complete_AC_extension_route\"><\/span>Define the complete AC extension route<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Record the one-way cable length, conductor material and cross-section, permitted current, insulation\/environment conditions and every plug, coupler or distribution accessory. Include the return conductor in resistance calculations. A20m lead usually creates about 40m of outgoing-and-return conductor path for this simple single-phase calculation.<\/p>\n<p>Use the receiver\u2019s documented or measured RMS current. Real watts divided by nominal voltage can understate current when power factor is below unity. Capture changing demand as well as a light-load reading if the equipment cycles.<\/p>\n<p>Inspect and use the lead according to its instructions. The current permitted on a reel may depend on its deployed condition; do not assume a wound reel has the same thermal rating as a fully deployed one.<\/p>\n<\/section>\n<section id=\"resistance-screen\">\n<h2><span class=\"ez-toc-section\" id=\"Calculate_a_resistance_screen_with_clear_assumptions\"><\/span>Calculate a resistance screen with clear assumptions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a short, predominantly resistive single-phase route, an initial screen is<strong>R<sub>loop<\/sub>=\u03c1\u00d72L\/A<\/strong>, followed by<strong>\u0394V\u2248I\u00d7R<sub>loop<\/sub><\/strong>. Use an appropriate conductor-temperature resistance value, and treat connector resistance separately. Longer or more reactive routes need a more complete AC calculation.<\/p>\n<p>Hypothetical example: assume copper resistivity 0.0175 \u03a9\u00b7mm\u00b2\/m at 20\u00b0C,20m one-way length,1.5 mm\u00b2 conductors and 2.5 A RMS current. Cable loop resistance is 0.467 \u03a9 and the estimated resistive drop is 1.17 V, about 0.51% of 230 V. Cable I\u00b2R loss is approximately 2.92 W. These numbers exclude hot-conductor increase and contact losses; they are not a cable-size recommendation.<\/p>\n<figure id=\"fig-diagram\" class=\"diagram\"><img decoding=\"async\" class=\"technical-desktop\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/diagram-9.svg\" alt=\"AC Extension Leads on an Inverter: Check Voltage at the Load  title=\" loading=\"lazy\" ac extension leads on an inverter: check voltage at the load title=\"\"><img decoding=\"async\" class=\"technical-mobile\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/diagram-mobile-9.svg\" alt=\"AC Extension Leads on an Inverter: Check Voltage at the Load  title=\" loading=\"lazy\" ac extension leads on an inverter: check voltage at the load title=\"\"><figcaption>Conceptual AC route measurement plan; the values in the worked example are assumed, not measured.<\/figcaption><a class=\"original-link\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/diagram-9.svg\">Open full-size technical illustration<\/a><\/figure>\n<p>Compare the result with the receiver\u2019s actual input range and the applicable installation requirements. A convenient percentage target is not a substitute for those limits.<\/p>\n<\/section>\n<section id=\"product-boundary\">\n<h2><span class=\"ez-toc-section\" id=\"Keep_the_inverter_and_lead_limits_separate\"><\/span>Keep the inverter and lead limits separate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The WHP600W page lists 600 W rated power and 1200 W peak power, with AC output options presented separately. Confirm the actual supplied AC voltage and frequency before using them in a route assessment. The official image shows a 600 W\/12 V example; it does not establish a different input option or the capability of a connected extension lead.<\/p>\n<figure id=\"fig-original\" class=\"product-original\"><a href=\"https:\/\/www.wehopower.com\/fr\/product\/600w-12v-24v-48v-dc-ac-110v-220v-pure-sine-wave-power-inverter\/\"><img decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/original-2.jpg\" alt=\"AC Extension Leads on an Inverter: Check Voltage at the Load  title=\" loading=\"lazy\" ac extension leads on an inverter: check voltage at the load title=\"\"><\/a><figcaption>Official WHP-600 family product photograph. The pictured markings are retained; the image does not identify every available input or AC output option.<\/figcaption><a class=\"original-link\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/original-2.jpg\">View original image<\/a><\/figure>\n<p><a href=\"https:\/\/www.victronenergy.com\/media\/pg\/The_Wiring_Unlimited_book\/en\/ac-wiring.html\" target=\"_blank\" rel=\"noopener\">Victron\u2019s AC cabling discussion<\/a> explains that voltage drop and connection heating also occur on AC circuits. Its installation examples and component instructions apply to the products described there; they are not WHP terminal instructions or a universal cable-sizing rule.<\/p>\n<\/section>\n<section id=\"measure-two-locations\">\n<h2><span class=\"ez-toc-section\" id=\"Compare_both_endpoints_during_a_controlled_load_state\"><\/span>Compare both endpoints during a controlled load state<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Have qualified personnel establish a suitable measurement arrangement without exposing live contacts. Record inverter-outlet voltage and receiver-input voltage for the same load state. If the load changes rapidly, unrelated readings taken at different times cannot establish the route\u2019s drop.<\/p>\n<p>Retain the AC current, output frequency, instrument method, lead configuration and temperature conditions. A distorted waveform or a short interruption may require more information than a slowly updating voltage display. Specify receiver behavior as well: did the device remain within its input limits and complete its intended cycle?<\/p>\n<p>If outlet voltage is satisfactory but the receiver voltage falls, investigate the downstream route and contacts. If both fall together, the lead alone cannot explain the observation. Preserve the evidence rather than replacing parts from a single reading.<\/p>\n<\/section>\n<section id=\"route-release\">\n<h2><span class=\"ez-toc-section\" id=\"Release_the_exact_extension_configuration\"><\/span>Release the exact extension configuration<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use the worksheet to connect the resistance estimate to actual endpoint measurements. Identify the permitted lead, maximum route length, load list and required deployed condition. Include the relevant cordset and accessory identities so a service replacement remains within the reviewed configuration.<\/p>\n<p>A warm or damaged connector needs investigation even if the total voltage drop appears small. Do not raise protective-device ratings to accommodate an unsuitable cable or connection. The required protection and installation remain the responsibility of the complete system design.<\/p>\n<p>Repeat the affected checks when the route length, conductor size, accessory, current demand or operating environment changes. This keeps an AC distribution issue from being misreported as an inverter power defect.<\/p>\n<\/section>\n<section class=\"cta\">\n<h2><span class=\"ez-toc-section\" id=\"Send_the_AC_route_and_receiver_conditions\"><\/span>Send the AC route and receiver conditions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When discussing WHP600W integration with WEHO, include the ordered output option, remote receiver requirements, AC current evidence and extension-route details. Keep the battery-side cable review as a separate part of the project.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/fr\/contact\/\">Discuss the inverter and AC distribution requirement<\/a><\/p>\n<\/section>\n<section id=\"worksheet\" class=\"sheet\">\n<h2><span class=\"ez-toc-section\" id=\"AC_extension_endpoint-voltage_record\"><\/span>AC extension endpoint-voltage record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"sheet-row\"><label>Exact inverter\/output option<input aria-label=\"Exact inverter\/output option\"><\/label><label>Lead and accessory identities<input aria-label=\"Lead and accessory identities\"><\/label><label>One-way route length \/ deployment<input aria-label=\"One-way route length \/ deployment\"><\/label><label>Receiver operating state<input aria-label=\"Receiver operating state\"><\/label><label>Measurement method \/ reviewer<input aria-label=\"Measurement method \/ reviewer\"><\/label><\/div>\n<div class=\"table-scroll\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">State<\/th>\n<th scope=\"col\">RMS current<\/th>\n<th scope=\"col\">Outlet voltage<\/th>\n<th scope=\"col\">Receiver voltage<\/th>\n<th scope=\"col\">Drop \/ receiver result<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<\/tr>\n<tr>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<\/tr>\n<tr>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<\/tr>\n<tr>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<td contenteditable=\"true\" aria-label=\"Worksheet cell\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Blank project worksheet. Enter verified project data; example calculations above are not measurements.<\/p>\n<\/section>\n<section class=\"source-list\">\n<h2><span class=\"ez-toc-section\" id=\"Sources_and_further_reading\"><\/span>Sources and further reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><a href=\"https:\/\/www.wehopower.com\/fr\/product\/600w-12v-24v-48v-dc-ac-110v-220v-pure-sine-wave-power-inverter\/\">WEHO WHP-600 family product information<\/a><\/li>\n<li><a href=\"https:\/\/www.victronenergy.com\/media\/pg\/The_Wiring_Unlimited_book\/en\/ac-wiring.html\" target=\"_blank\" rel=\"noopener\">Victron Wiring Unlimited: AC wiring<\/a><\/li>\n<\/ol>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>Calculate and measure AC-side extension-lead voltage drop at the load. Distinguish cable and connector effects from inverter output using a 600 W WHP reference.<\/p>","protected":false},"author":2,"featured_media":20721,"parent":0,"menu_order":40,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-20734","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/20734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/comments?post=20734"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/20734\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media\/20721"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media?parent=20734"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news_category?post=20734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}