{"id":19565,"date":"2026-10-19T11:43:41","date_gmt":"2026-10-19T03:43:41","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/power-supply-efficiency-vs-power-factor-input-budget\/"},"modified":"2026-10-19T12:23:16","modified_gmt":"2026-10-19T04:23:16","slug":"power-supply-efficiency-vs-power-factor-input-budget","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/","title":{"rendered":"Power Supply Efficiency vs Power Factor: Calculate AC Input Current"},"content":{"rendered":"<div class=\"weho-blog-content\" id=\"weho-article-04\" data-weho-article-id=\"04\">\n<p class=\"direct-answer\">Use efficiency to compare real input watts and conversion heat; use total power factor to compare input VA and RMS current. For a steady single-phase load, RMS current equals DC output watts divided by RMS input voltage, efficiency and total PF. Compare candidates at the same input, load, temperature and cooling conditions.<\/p>\n<figure class=\"scene-hero\" id=\"application-scene-04\"><a href=\"https:\/\/www.wehopower.com\/ur\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" aria-label=\"View WEHO LRS-350-24 product details\" title=\"LRS-350-24 product details\" data-weho-link-kind=\"product_detail\" data-weho-link-role=\"product_image\" data-weho-model=\"LRS-350-24\" class=\"weho-product-image-link\"><picture><source type=\"image\/webp\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-scene-960.webp?quality=85&#038;strip=all 960w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-scene.webp?quality=85&#038;strip=all 1672w\" sizes=\"(max-width:760px) calc(100vw - 36px), 760px\"><img fetchpriority=\"high\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-scene.webp?quality=85&#038;strip=all\" width=\"1672\" height=\"941\" alt=\"Power Supply Efficiency vs Power Factor: Calculate AC Input Current  title=\" loading=\"eager\" decoding=\"async\" power supply efficiency vs factor: calculate ac input current title =\"\"><\/picture><\/a><figcaption>AI-assisted input-evaluation illustration based on WEHO LRS-350-24 references; no measurements are displayed. The article&#8217;s efficiency and power-factor calculation cases are hypothetical and are not ratings or test results for the pictured model.<span class=\"weho-image-actions\" data-weho-image-actions=\"1\"><span class=\"weho-image-hint\">LRS-350-24 \u00b7 Select image for product details.<\/span><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-scene.png\" target=\"_blank\" rel=\"noopener noreferrer\" data-weho-link-role=\"view_original\">View larger image \u2197<\/a><\/span><\/figcaption><\/figure>\n<details class=\"article-toc\" open>\n<summary>\u0645\u0646\u062f\u0631\u062c\u0627\u062a \u06a9\u0627 \u062c\u062f\u0648\u0644<\/summary>\n<nav class=\"toc-links\" aria-label=\"Article sections\"><a href=\"#separate-two-ratios\">Separate efficiency from power factor<\/a><a href=\"#single-phase-formula\">Calculate single-phase input current, VA, and losses<\/a><a href=\"#worked-ac-input-budget\">Compare 240 W at PF 0.60 and PF 0.95<\/a><a href=\"#same-condition-comparison\">Compare supplier data at the same operating points<\/a><a href=\"#limits-of-budget\">Check startup and upstream equipment separately<\/a><a href=\"#use-budget-with-weho\">Turn the calculation into a supplier request<\/a><a href=\"#efficiency-pf-faq\">Efficiency and power-factor FAQ<\/a><\/nav>\n<\/details>\n<section id=\"separate-two-ratios\">\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\">\u0645\u0646\u062f\u0631\u062c\u0627\u062a \u06a9\u0627 \u062c\u062f\u0648\u0644<\/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;\">\u0679\u0648\u06af\u0644 \u06a9\u0631\u06cc\u06ba\u06d4<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Separate_efficiency_from_power_factor\" >Separate efficiency from power factor<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Calculate_single-phase_input_current_VA_and_losses\" >Calculate single-phase input current, VA, and losses<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Compare_240_W_at_PF_060_and_PF_095\" >Compare 240 W at PF 0.60 and PF 0.95<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Compare_supplier_data_at_the_same_operating_points\" >Compare supplier data at the same operating points<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Check_startup_and_upstream_equipment_separately\" >Check startup and upstream equipment separately<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Turn_the_calculation_into_a_supplier_request\" >Turn the calculation into a supplier request<\/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\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Efficiency_and_power-factor_FAQ\" >Efficiency and power-factor FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Can_I_use_the_full-load_PF_at_light_load\" >Can I use the full-load PF at light load?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Can_these_formulas_be_used_unchanged_for_three-phase_input\" >Can these formulas be used unchanged for three-phase input?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-efficiency-vs-power-factor-input-budget\/#Request_comparable_input_data\" >Request comparable input data<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Separate_efficiency_from_power_factor\"><\/span>Separate efficiency from power factor<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Efficiency is output power divided by real input power. If a supply delivers 240 W at 90% efficiency, it needs approximately 266.7 W at its AC input. The difference, about 26.7 W, is the conversion loss within the defined measurement boundary.<\/p>\n<p>Power factor, or PF, is real input power divided by apparent input power. Apparent power is RMS voltage multiplied by RMS current, expressed in VA. <a href=\"https:\/\/www.xppower.com\/storage\/documents\/technical-articles\/PowerFactor.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">The referenced technical article on watts and VA<\/a> explains these definitions and why separate voltage and current readings do not by themselves establish real AC watts.<\/p>\n<p>Keep three columns in the procurement comparison: output watts, input real watts, and input VA. A statement such as \u201c95% efficient with PFC\u201d is incomplete until the test conditions and actual PF are known. Neither number can be substituted for the other.<\/p>\n<\/section>\n<section id=\"single-phase-formula\">\n<h2><span class=\"ez-toc-section\" id=\"Calculate_single-phase_input_current_VA_and_losses\"><\/span>Calculate single-phase input current, VA, and losses<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a steady single-phase operating point, use RMS input voltage and decimal values for efficiency \u03b7 and total PF (90% efficiency means \u03b7 = 0.90):<\/p>\n<div class=\"formula-block\" role=\"group\" aria-label=\"Real input power formula\">\n<p><strong>Real input power \u00b7 W<\/strong><br \/>P<sub>in<\/sub> = P<sub>out<\/sub> \u00f7 \u03b7<\/p>\n<\/div>\n<div class=\"formula-block\" role=\"group\" aria-label=\"Apparent input power formula\">\n<p><strong>Apparent input power \u00b7 VA<\/strong><br \/>S<sub>in<\/sub> = P<sub>in<\/sub> \u00f7 PF = P<sub>out<\/sub> \u00f7 (\u03b7 \u00d7 PF)<\/p>\n<\/div>\n<div class=\"formula-block\" role=\"group\" aria-label=\"RMS input current formula\">\n<p><strong>RMS input current \u00b7 A<\/strong><br \/>I<sub>in,rms<\/sub> = P<sub>out<\/sub> \u00f7 (V<sub>in,rms<\/sub> \u00d7 \u03b7 \u00d7 PF)<\/p>\n<\/div>\n<div class=\"formula-block\" role=\"group\" aria-label=\"Conversion loss formula\">\n<p><strong>Conversion loss \u00b7 W<\/strong><br \/>P<sub>loss<\/sub> = P<sub>in<\/sub> \u2212 P<sub>out<\/sub><\/p>\n<\/div>\n<p>These relationships follow the power definitions. The engineering estimate becomes approximate when \u03b7 and PF are assumed, rounded, or taken from typical data. <a href=\"https:\/\/www.ia.omron.com\/support\/guide\/22\/explanation_of_terms.html\" target=\"_blank\" rel=\"noopener noreferrer\">the external power-supply terminology guide<\/a> likewise identifies output power, input voltage, PF, and efficiency as inputs to AC current.<\/p>\n<p>Use the total PF for the actual waveform. A switching supply can draw nonlinear current, so a displacement-angle value alone may be insufficient. <a href=\"https:\/\/www.tek.com\/en\/documents\/application-note\/power-supply-measurement-and-analysis-3-pwr\" target=\"_blank\" rel=\"noopener noreferrer\">The referenced power-supply measurement note<\/a> describes input waveform distortion and treats RMS current, true power, apparent power, harmonics, and PF as separate measurements.<\/p>\n<\/section>\n<section id=\"worked-ac-input-budget\">\n<h2><span class=\"ez-toc-section\" id=\"Compare_240_W_at_PF_060_and_PF_095\"><\/span>Compare 240 W at PF 0.60 and PF 0.95<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>All three cases below are hypothetical, with 230 V RMS input and 240 W DC output. Cases A and B hold efficiency at 90% and change only total PF. Case C keeps Case B\u2019s PF and raises assumed efficiency to 92% to separate the two effects.<\/p>\n<div class=\"table-scroll\">\n<table>\n<caption>Hypothetical AC input comparison: separate PF and efficiency changes<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Parameter<\/th>\n<th scope=\"col\">Case A (lower PF)<\/th>\n<th scope=\"col\">Case B (higher PF)<\/th>\n<th scope=\"col\">Case C (higher efficiency)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">DC output power<\/th>\n<td>240.0 W<\/td>\n<td>240.0 W<\/td>\n<td>240.0 W<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Efficiency, assumed<\/th>\n<td>90%<\/td>\n<td>90%<\/td>\n<td>92%<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">\u0627\u0646 \u067e\u0679 \u0648\u0648\u0644\u0679\u06cc\u062c<\/th>\n<td>230 V RMS<\/td>\n<td>230 V RMS<\/td>\n<td>230 V RMS<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Total power factor, assumed<\/th>\n<td>0.60<\/td>\n<td>0.95<\/td>\n<td>0.95<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Real input power<\/th>\n<td>266.7 W<\/td>\n<td>266.7 W<\/td>\n<td>260.9 W<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Apparent input power<\/th>\n<td>444.4 VA<\/td>\n<td>280.7 VA<\/td>\n<td>274.6 VA<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Estimated RMS input current<\/th>\n<td>1.93 A<\/td>\n<td>1.22 A<\/td>\n<td>1.19 A<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Calculated conversion loss<\/th>\n<td>26.7 W<\/td>\n<td>26.7 W<\/td>\n<td>20.9 W<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Case A current is 240 \u00f7 (230 \u00d7 0.90 \u00d7 0.60) = 1.932 A. Case B current is 240 \u00f7 (230 \u00d7 0.90 \u00d7 0.95) = 1.220 A. At this operating point, the higher PF reduces the calculated RMS current by about 36.8%; the real input watts and conversion loss remain equal because efficiency was held equal.<\/p>\n<p>Use the calculated conversion loss for the supply\u2019s enclosure heat contribution: 26.7 W in Cases A and B. Review the <a href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-derating-guide\/\" data-weho-link-kind=\"guide\">power supply derating guide<\/a> alongside model-specific data when evaluating cabinet temperature and permitted output. The difference between VA and W does not represent extra heat inside the unit.<\/p>\n<p>Case C isolates the efficiency change. Real input is 240 \u00f7 0.92 = 260.9 W and conversion loss is 20.9 W, about 5.8 W below Case B. Output and PF stay constant, so this difference comes from the assumed efficiency improvement.<\/p>\n<figure class=\"article-relation\" id=\"relation-04\"><picture><source media=\"(max-width:640px)\" type=\"image\/webp\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/relation-04-mobile.webp\" width=\"380\" height=\"960\"><source media=\"(max-width:640px)\" type=\"image\/png\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/relation-04-mobile.png\" width=\"380\" height=\"960\"><source type=\"image\/webp\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/relation-04-desktop.webp\"><img loading=\"lazy\" class=\"relation-image\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/relation-04-desktop.png?quality=85&#038;strip=all\" width=\"2240\" height=\"1460\" alt=\"Power Supply Efficiency vs Power Factor: Calculate AC Input Current  title=\" decoding=\"async\" power supply efficiency vs factor: calculate ac input current title =\"\"><\/picture><figcaption class=\"relation-caption\">At equal efficiency, changing total PF changes VA and RMS input current. Changing efficiency changes real input power and conversion loss.<\/figcaption><a class=\"relation-detail\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/relation-04-desktop.png\" target=\"_blank\" rel=\"noopener noreferrer\">View full diagram<\/a><\/figure>\n<\/section>\n<section id=\"same-condition-comparison\">\n<h2><span class=\"ez-toc-section\" id=\"Compare_supplier_data_at_the_same_operating_points\"><\/span>Compare supplier data at the same operating points<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before choosing a candidate, give each supplier the same operating points. At a minimum, request data for the actual output voltage and normal load, the lowest continuous AC input, and representative light-load operation. Add the project\u2019s relevant temperature and cooling conditions. Do not compare one model\u2019s peak efficiency at light load with another model\u2019s full-load figure.<\/p>\n<p>Request a table with one row per operating point and these fields:<\/p>\n<ul>\n<li>Exact model, output-voltage variant, document revision, and test date.<\/li>\n<li>AC voltage and frequency, DC output voltage and current, ambient temperature, mounting, and cooling.<\/li>\n<li>Real input W, input VA, RMS current, efficiency, and total PF at each requested point.<\/li>\n<li>Whether each value is typical, guaranteed, calculated, or measured, with stated measurement uncertainty.<\/li>\n<li>Inrush conditions and applicable harmonic-current evidence recorded separately from steady-state results.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.pulspower.com\/wp-content\/uploads\/2023\/08\/AN57_Wirkungsgrad_EN.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">The external efficiency-measurement paper<\/a> explains why meter capability, measurement boundaries, temperature, and operating time affect the result. A small claimed difference is less useful when the measurement uncertainty is not supplied.<\/p>\n<p>For a replacement project, carry the AC input and thermal requirements into the <a href=\"https:\/\/www.wehopower.com\/ur\/news\/industrial-power-supply-replacement-interface-validation\/#interface-matrix\" data-weho-link-kind=\"guide\">industrial power supply replacement checklist<\/a>, alongside the output and control interfaces.<\/p>\n<\/section>\n<section id=\"limits-of-budget\">\n<h2><span class=\"ez-toc-section\" id=\"Check_startup_and_upstream_equipment_separately\"><\/span>Check startup and upstream equipment separately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The example is a first-pass operating budget. It does not calculate turn-on inrush, fuse behavior, breaker coordination, conductor sizing, or UPS compatibility. Those decisions require the relevant equipment documentation and installation requirements. A steady 1.22 A estimate cannot establish that a particular protective device will tolerate startup; evaluate turn-on charging pulses separately using the <a href=\"https:\/\/www.wehopower.com\/ur\/news\/power-supply-inrush-current-multiple-units\/\" data-weho-link-kind=\"guide\">multi-supply inrush current guide<\/a>.<\/p>\n<p>For several supplies, list each unit\u2019s real power and operating state. Summing nameplate DC watts misses conversion losses; multiplying that total by one assumed PF can also hide mixed behavior. Where upstream capacity matters, confirm the aggregate RMS current, waveform, and operating sequence rather than assuming currents combine exactly like independent DC loads.<\/p>\n<p>Keep harmonic-current evidence alongside the operating-point table. A PF value alone does not establish compliance for the exact product or finished equipment.<\/p>\n<p>On the DC side, review <a href=\"https:\/\/www.wehopower.com\/ur\/news\/24v-dc-branch-protection-selectivity\/#available-fault-current\" data-weho-link-kind=\"guide\">24 V branch protection and available fault current<\/a> against the source response and the voltage limits of loads that must keep operating.<\/p>\n<\/section>\n<section id=\"use-budget-with-weho\">\n<h2><span class=\"ez-toc-section\" id=\"Turn_the_calculation_into_a_supplier_request\"><\/span>Turn the calculation into a supplier request<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/weho-blog-2026-10-17-product-v4-04-ac-input-budget.csv\" target=\"_blank\" rel=\"noopener noreferrer\" data-weho-link-kind=\"worksheet\" download>Download the AC input-budget record<\/a> for the three worked cases and supplier comparisons. It is a static CSV; use the formulas above to recalculate after changing inputs. Keep operating conditions and data status beside each row.<\/p>\n<p>Establish the required DC output with the <a href=\"https:\/\/www.wehopower.com\/ur\/news\/how-to-size-a-24v-din-rail-power-supply-for-a-control-panel\/\" data-weho-link-kind=\"guide\">24 V DIN rail power supply sizing guide<\/a> before requesting the exact candidate\u2019s operating-point data. A family label or a maximum efficiency headline cannot establish the numbers needed for the final input budget.<\/p>\n<p>If energy cost is part of the business case, compare real input energy across the actual duty cycle. The higher-PF case alone does not demonstrate lower kWh consumption. Any billing benefit depends on the site\u2019s tariff and measured system behavior; upstream distribution losses also require their own evaluation.<\/p>\n<p class=\"related-model-documents\">For the illustrated enclosure, use the <a href=\"https:\/\/www.wehopower.com\/ur\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" data-weho-link-kind=\"product_detail\">LRS-350 product details<\/a> and <a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/10\/LRS-350-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\" data-weho-link-kind=\"datasheet\">LRS-350 specification<\/a> to start a model-specific data request. The assumed efficiency and power-factor values in the worked comparison do not describe that product.<\/p>\n<\/section>\n<section id=\"efficiency-pf-faq\">\n<h2><span class=\"ez-toc-section\" id=\"Efficiency_and_power-factor_FAQ\"><\/span>Efficiency and power-factor FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_use_the_full-load_PF_at_light_load\"><\/span>Can I use the full-load PF at light load?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Only if the exact product\u2019s data supports it. Request the operating point that represents the machine\u2019s standby or partial-load state.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_these_formulas_be_used_unchanged_for_three-phase_input\"><\/span>Can these formulas be used unchanged for three-phase input?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. The calculation here is for single-phase input. Use the appropriate three-phase relationship and the actual connection and balance conditions.<\/p>\n<\/section>\n<aside class=\"article-cta\">\n<h2><span class=\"ez-toc-section\" id=\"Request_comparable_input_data\"><\/span>Request comparable input data<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.wehopower.com\/ur\/contact\/\" data-weho-link-kind=\"inquiry\">Contact WEHO about the AC input budget<\/a>. Include the target DC output, AC input range and normal load. Add a candidate model or the input-budget record if available.<\/p>\n<p><strong>First-inquiry brief:<\/strong> \u201cWe need a supply for the attached output, input range and load. Which candidate data can you share for real input W, VA, RMS current, efficiency and total PF at that operating point?\u201d<\/p>\n<p>For the detailed comparison, add standby and lowest-input operating points, cabinet temperature and cooling. Ask which values are typical or guaranteed, what measurement conditions apply, and what startup information is available.<\/p>\n<\/aside>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Efficiency determines real input power and conversion loss; total power factor determines how real input watts relate to VA and RMS current. At 240 W output, 230 V RMS and 90% efficiency, PF 0.60 and 0.95 give about 1.93 A and 1.22 A. A separate 92% efficiency case shows the effect on input watts and heat.<\/p>","protected":false},"author":2,"featured_media":19442,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-19565","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\/ur\/wp-json\/wp\/v2\/news\/19565","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/comments?post=19565"}],"version-history":[{"count":1,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/19565\/revisions"}],"predecessor-version":[{"id":19644,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/19565\/revisions\/19644"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/media\/19442"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/media?parent=19565"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news_category?post=19565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}