{"id":19972,"date":"2026-10-23T16:44:43","date_gmt":"2026-10-23T08:44:43","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/standby-power-consumption-oem-state-energy-budget\/"},"modified":"2026-10-23T16:44:43","modified_gmt":"2026-10-23T08:44:43","slug":"standby-power-consumption-oem-state-energy-budget","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/","title":{"rendered":"Standby Power Consumption in OEM Equipment: Build a State-Based AC Energy Budget"},"content":{"rendered":"<div class=\"weho-blog-content\" id=\"weho-article-28\" data-weho-article-id=\"28\">\n<p><strong>Calculate standby power consumption at the equipment boundary you intend to improve.<\/strong> A machine waiting for a command may still power a controller, communications, indicators, and auxiliary converters. Its AC input consumption is different from the no-load input power of the disconnected power supply. For OEM comparison, define each operating state, measure real input power, and multiply it by the time the equipment actually spends there.<\/p>\n<p>The resulting state-based energy budget helps engineering and procurement compare useful changes. A lower standby figure matters in proportion to its duration; it does not automatically create the same percentage reduction in annual equipment energy.<\/p>\n<details class=\"article-toc\" open=\"\">\n<summary>Article sections<\/summary>\n<nav class=\"toc-links\" aria-label=\"Article sections\"><a href=\"#define-the-state-and-the-measurement-boundary\">Define the state and the measurement boundary<\/a><a href=\"#use-watts-for-the-energy-budget-not-volt-amperes\">Use watts for the energy budget, not volt-amperes<\/a><a href=\"#build-a-daily-energy-budget-from-real-operating-time\">Build a daily energy budget from real operating time<\/a><a href=\"#measure-low-input-power-with-an-appropriate-method\">Measure low input power with an appropriate method<\/a><a href=\"#lrs-standby-measurement-review\">Define comparable measurements for LRS-350-24<\/a><a href=\"#keep-component-loss-and-equipment-consumption-separate-in-purchasing\">Keep component loss and equipment consumption separate in purchasing<\/a><\/nav>\n<\/details>\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\">\u0935\u093f\u0937\u092f\u0938\u0942\u091a\u0940<\/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;\">\u091f\u0949\u0917\u0932<\/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\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/#Define_the_state_and_the_measurement_boundary\" >Define the state and the measurement boundary<\/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\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/#Use_watts_for_the_energy_budget_not_volt-amperes\" >Use watts for the energy budget, not volt-amperes<\/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\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/#Build_a_daily_energy_budget_from_real_operating_time\" >Build a daily energy budget from real operating time<\/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\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/#Measure_low_input_power_with_an_appropriate_method\" >Measure low input power with an appropriate method<\/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\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/#Define_comparable_measurements_for_LRS-350-24\" >Define comparable measurements for LRS-350-24<\/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\/hi\/news\/standby-power-consumption-oem-state-energy-budget\/#Keep_component_loss_and_equipment_consumption_separate_in_purchasing\" >Keep component loss and equipment consumption separate in purchasing<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"define-the-state-and-the-measurement-boundary\"><span class=\"ez-toc-section\" id=\"Define_the_state_and_the_measurement_boundary\"><\/span>Define the state and the measurement boundary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use operational descriptions that another engineer can reproduce. \u201cStandby\u201d might mean waiting for a network command with the process hardware disabled. \u201cIdle ready\u201d might retain more subsystems so production resumes quickly. State those functions explicitly. The names here describe an OEM project, not a legal classification applied to every machine.<\/p>\n<div class=\"weho-table-wrap\" tabindex=\"0\" role=\"region\" aria-label=\"Engineering comparison table\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Quantity<\/th>\n<th scope=\"col\">Boundary and condition<\/th>\n<th scope=\"col\">What it answers<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Equipment active input power<\/td>\n<td>AC inlet of the defined equipment during a representative task.<\/td>\n<td>What does the operating task consume?<\/td>\n<\/tr>\n<tr>\n<td>Equipment idle or standby input power<\/td>\n<td>Same AC inlet, with a documented set of functions retained.<\/td>\n<td>What does the machine consume while waiting?<\/td>\n<\/tr>\n<tr>\n<td>PSU no-load input power<\/td>\n<td>AC input of one specified power supply, with its external output load disconnected under stated conditions.<\/td>\n<td>What does that source draw without the connected equipment load?<\/td>\n<\/tr>\n<tr>\n<td>Rated DC output power<\/td>\n<td>Source output capability under documented conditions.<\/td>\n<td>How much load can the source support, rather than what it continuously draws?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<figure class=\"article-relation\"><picture><source media=\"(max-width:600px)\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/28-mobile.svg\"><img fetchpriority=\"high\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/28-desktop.svg\" width=\"1200\" height=\"675\" alt=\"Standby Power Consumption in OEM Equipment: Build a State-Based AC Energy Budget  title=\" loading=\"eager\" decoding=\"async\" standby power consumption in oem equipment: build state-based ac energy budget title=\"\"><\/picture><figcaption>Original conceptual state-energy ledger. No state powers, dwell times or energy proportions are assumed; use the article\u2019s agreed boundary and operating definitions. The daily energy-budget table below applies the method to a separate hypothetical example of 640 Wh, 24 Wh and 16.8 Wh.<br \/>\n<a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/28-desktop.svg\" target=\"_blank\" rel=\"noopener\" class=\"diagram-original\" data-weho-link-role=\"view_original\">View full diagram \u2197<\/a><\/figcaption><\/figure>\n<p>Also identify separate feeds. A cabinet may receive power through its main inlet while an external network or backup source energizes another interface. Document those contributions rather than declaring the whole machine \u201coff\u201d because one inlet reads zero.<\/p>\n<h2 id=\"use-watts-for-the-energy-budget-not-volt-amperes\"><span class=\"ez-toc-section\" id=\"Use_watts_for_the_energy_budget_not_volt-amperes\"><\/span>Use watts for the energy budget, not volt-amperes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Real input power is measured in watts. Apparent power, in VA, is RMS voltage multiplied by RMS current. Power factor is the ratio of real to apparent power. <a href=\"https:\/\/helpfiles.keysight.com\/Standalone_BenchVueSoftware_PW_HelpFiles\/PWACSourceApp\/Content\/GUI_Meter\/Meter%20View.htm\" target=\"_blank\" rel=\"noopener noreferrer\">Keysight&#8217;s instrument documentation<\/a> lists W, VA, and power factor as distinct readings. A current measurement and the mains voltage alone do not establish real consumption.<\/p>\n<p>For example, assume a low-power state has 230 V RMS, 0.020 A RMS, and a measured true input power of 1.20 W. Apparent power is <strong>230 \u00d7 0.020 = 4.60 VA<\/strong>; power factor is <strong>1.20 \u00f7 4.60 \u2248 0.261<\/strong>. Use 1.20 W in the energy calculation. Treating 4.60 VA as 4.60 W would overstate consumption.<\/p>\n<p>Efficiency addresses another relationship: DC output power divided by real AC input power. It is useful at a defined loaded operating point. At zero delivered output, a percentage efficiency does not help rank the remaining input loss. The <a href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-efficiency-vs-power-factor-input-budget\/\" data-weho-link-kind=\"guide\">WEHO guide to efficiency, power factor, and input current<\/a> explains the separation. Keep the no-load watt figure alongside the loaded efficiency data.<\/p>\n<h2 id=\"build-a-daily-energy-budget-from-real-operating-time\"><span class=\"ez-toc-section\" id=\"Build_a_daily_energy_budget_from_real_operating_time\"><\/span>Build a daily energy budget from real operating time<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Consider a hypothetical control subsystem whose entire defined AC boundary averages 80 W during production, 12 W while idle ready, and 1.2 W in standby. Assume eight, two, and fourteen hours in those states every day. These are project assumptions, not measured WEHO product performance.<\/p>\n<div class=\"weho-table-wrap\" tabindex=\"0\" role=\"region\" aria-label=\"Engineering comparison table\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">State<\/th>\n<th scope=\"col\">Assumed real AC input<\/th>\n<th scope=\"col\">Hours per day<\/th>\n<th scope=\"col\">Daily energy<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0909\u0924\u094d\u092a\u093e\u0926\u0928<\/td>\n<td>80 W<\/td>\n<td>8 h<\/td>\n<td>80 \u00d7 8 = 640 Wh<\/td>\n<\/tr>\n<tr>\n<td>Idle ready<\/td>\n<td>12 W<\/td>\n<td>2 h<\/td>\n<td>12 \u00d7 2 = 24 Wh<\/td>\n<\/tr>\n<tr>\n<td>Standby<\/td>\n<td>1.2 W<\/td>\n<td>14 h<\/td>\n<td>1.2 \u00d7 14 = 16.8 Wh<\/td>\n<\/tr>\n<tr>\n<td>Total<\/td>\n<td>State-dependent<\/td>\n<td>24 h<\/td>\n<td>680.8 Wh = 0.6808 kWh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Use <strong>E = \u03a3(P<sub>state<\/sub> \u00d7 t<sub>state<\/sub>)<\/strong>. With this exact schedule repeated for an assumed 365 days, annual energy is <strong>0.6808 \u00d7 365 = 248.492 kWh<\/strong> per subsystem. Real projects need a separate schedule for weekends, shutdown days, and seasonal operation.<\/p>\n<p>Now suppose a verified design change reduces standby input from 1.2 W to 0.6 W while preserving the required functions. The hypothetical saving is <strong>(1.2 \u2212 0.6) \u00d7 14 = 8.4 Wh\/day<\/strong>, or 3.066 kWh\/year on the same schedule. Standby power falls by 50%, but total daily energy falls by approximately <strong>1.23%<\/strong>. Keep both percentages attached to their proper denominators.<\/p>\n<p>Include transition energy if repeated wakeups materially affect the total. An event already captured in a state&#8217;s measured average must not be added again. The sum of state durations also needs to match the observation period; overlapping state labels create double counting.<\/p>\n<h2 id=\"measure-low-input-power-with-an-appropriate-method\"><span class=\"ez-toc-section\" id=\"Measure_low_input_power_with_an_appropriate_method\"><\/span>Measure low input power with an appropriate method<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Select an instrument whose uncertainty, resolution, current range, and peak-current capability suit the state being measured. Preserve the input voltage, frequency, equipment configuration, ambient condition, and averaging interval. One stable-looking display value is weak evidence when the equipment periodically polls, communicates, or wakes.<\/p>\n<p>The <a href=\"https:\/\/www.energy.gov\/cmei\/femp\/measuring-standby-power\" target=\"_blank\" rel=\"noopener noreferrer\">U.S. Department of Energy&#8217;s measurement summary<\/a> explains averaging fluctuating consumption by measuring energy over an interval and dividing by elapsed time. For an OEM engineering study, choose an interval that captures the actual recurring behavior. That reference is measurement background, not a declaration that a particular appliance test or purchasing rule applies to your equipment.<\/p>\n<p><a href=\"https:\/\/www.ti.com\/mx\/lit\/pdf\/slua865\" target=\"_blank\" rel=\"noopener noreferrer\">TI application report SLUA865B, section 6<\/a>, also discusses energy integration for burst-mode measurements and the effect of instrument loading on small results. Apply the appropriate analyzer instructions to the actual circuit. Do not transfer a reference board&#8217;s milliwatt result or connection details to an unrelated assembled supply.<\/p>\n<section class=\"weho-model-review\" aria-labelledby=\"lrs-standby-measurement-review\" data-weho-model=\"LRS-350-24\">\n<h2 id=\"lrs-standby-measurement-review\"><span class=\"ez-toc-section\" id=\"Define_comparable_measurements_for_LRS-350-24\"><\/span>Define comparable measurements for LRS-350-24<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"model-review-layout\">\n<div class=\"model-review-intro\">\n<p>For equipment considering the <a href=\"https:\/\/www.wehopower.com\/hi\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" data-weho-link-kind=\"product_detail\">WEHO LRS-350-24 enclosed power supply<\/a>, the <a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/10\/LRS-350-1.pdf\">LRS-350 public specification<\/a> lists a 24 V, 0\u201314.6 A output version and selectable 90\u2013132 \/ 180\u2013264 V AC input ranges. Record the exact sample revision, input selector position, AC conditions, temperature, warm-up and any internal fan state. Source-alone measurements include the supply&#8217;s own auxiliary consumption; keep fitted auxiliaries in the configuration used by the equipment. Rated output and loaded efficiency cannot replace a measured no-load or standby input-power value.<\/p>\n<\/div>\n<figure class=\"model-photo\"><a href=\"https:\/\/www.wehopower.com\/hi\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" class=\"model-product-link\" data-weho-link-role=\"product_image\" data-weho-model=\"LRS-350-24\" aria-label=\"LRS-350-24 product details\" data-weho-link-kind=\"product_detail\"><img loading=\"lazy\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/lrs-350-24.webp\" width=\"420\" height=\"760\" alt=\"Standby Power Consumption in OEM Equipment: Build a State-Based AC Energy Budget  title=\" decoding=\"async\" standby power consumption in oem equipment: build state-based ac energy budget title =\"\"><\/a><figcaption><a href=\"https:\/\/www.wehopower.com\/hi\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" class=\"model-name-link\" data-weho-link-role=\"product_text\" data-weho-link-kind=\"product_detail\">LRS-350-24 product details \u2197<\/a><br \/>\n<span>LRS-350-24 measurement candidate; no standby or no-load value is asserted.<\/span><br \/>\n<a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/lrs-350-24-original.jpg\" target=\"_blank\" rel=\"noopener\" class=\"photo-original\" data-weho-link-role=\"view_original\">View original photograph \u2197<\/a><\/figcaption><\/figure>\n<div class=\"model-review-detail\">\n<p>Request two distinct records: the source alone with its external output load disconnected, and the connected equipment in each retained-function state. Supply a state list showing controller and communication loads, accessories, wake-up interval, required restart time, and daily duration. Keep AC conditions and measurement boundaries comparable, and retain the instrument details, averaging interval, and uncertainty with each result. Neither the hypothetical 1.2 W nor the 0.6 W figure above is a measured result for LRS-350-24.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<h2 id=\"keep-component-loss-and-equipment-consumption-separate-in-purchasing\"><span class=\"ez-toc-section\" id=\"Keep_component_loss_and_equipment_consumption_separate_in_purchasing\"><\/span>Keep component loss and equipment consumption separate in purchasing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A supplier&#8217;s source-only no-load measurement can support component comparison, but it cannot predict a connected machine&#8217;s standby consumption. Reconnecting the controller changes the loading and possibly the source&#8217;s operating mode. Subtracting the disconnected no-load figure from the complete machine reading does not reliably reveal the controller&#8217;s DC power.<\/p>\n<p>Keep loaded-efficiency operating points separate from the no-load and retained-function records. A proposed improvement must preserve the equipment&#8217;s required waiting-state functions and restart behavior.<\/p>\n<p>Use the <a href=\"https:\/\/www.wehopower.com\/hi\/news\/24v-power-supply-manufacturer-oem-rfq-checklist\/\" data-weho-link-kind=\"guide\">OEM power-supply RFQ checklist<\/a> to carry the agreed conditions into sample review. Preserve the state definitions with the configuration record so a firmware change or an always-on accessory does not silently change the basis of comparison.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/hi\/contact\/\" data-weho-link-kind=\"inquiry\">Ask WEHO for model-specific no-load and operating-point information<\/a>. Send the identified LRS-350-24 configuration and the state schedule and measurement records above. Evaluate any proposed saving against the complete equipment energy budget.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A power supply\u2019s no-load input figure is not the standby consumption of a complete machine. Define the measurement boundary and time in each operating state, then calculate AC energy from real power rather than output wattage or VA.<\/p>","protected":false},"author":2,"featured_media":19889,"parent":0,"menu_order":134,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-19972","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\/hi\/wp-json\/wp\/v2\/news\/19972","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/comments?post=19972"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news\/19972\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/media\/19889"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/media?parent=19972"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news_category?post=19972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}