{"id":235,"date":"2026-03-13T13:54:10","date_gmt":"2026-03-13T12:54:10","guid":{"rendered":"https:\/\/www.ekonity.com\/en\/?p=235"},"modified":"2026-03-13T14:07:53","modified_gmt":"2026-03-13T13:07:53","slug":"what-is-the-difference-between-kw-and-kva-understanding-units-of-electrical-power","status":"publish","type":"post","link":"https:\/\/www.ekonity.com\/en\/what-is-the-difference-between-kw-and-kva-understanding-units-of-electrical-power\/","title":{"rendered":"What is the difference between kW and kVA? Understanding units of electrical power"},"content":{"rendered":"\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<p class=\"has-text-align-left\">In the field of energy, and more specifically when discussing generators or mobile power systems, two units frequently come up: <strong>kVA (kilovolt-ampere)<\/strong> and <strong>kW (kilowatt)<\/strong>.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<p class=\"has-text-align-left\">These two concepts are often confused, yet they play a key role in <strong>sizing a generator<\/strong>. Understanding the difference between kVA and kW helps prevent sizing errors, improves energy efficiency, and ensures reliable operation of equipment.<\/p>\n<\/div>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.ekonity.com\/wp-content\/uploads\/2026\/03\/Capture-decran-2026-03-13-122937.png\" alt=\"\" class=\"wp-image-1079\" style=\"aspect-ratio:1.1715623669646658;width:377px;height:auto\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What is the <mark class=\"has-inline-color has-primary-color\">difference between kVA and kW<\/mark>?<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"398\" src=\"https:\/\/www.ekonity.com\/en\/wp-content\/uploads\/sites\/2\/2026\/03\/76lF3t8.jpg\" alt=\"\" class=\"wp-image-238\" style=\"aspect-ratio:0.9155680224403927;width:276px;height:auto\" srcset=\"https:\/\/www.ekonity.com\/en\/wp-content\/uploads\/sites\/2\/2026\/03\/76lF3t8.jpg 500w, https:\/\/www.ekonity.com\/en\/wp-content\/uploads\/sites\/2\/2026\/03\/76lF3t8-300x239.jpg 300w, https:\/\/www.ekonity.com\/en\/wp-content\/uploads\/sites\/2\/2026\/03\/76lF3t8-200x159.jpg 200w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n<p>The <strong>kilowatt (kW)<\/strong> corresponds to <strong>real power<\/strong>, i.e., the energy actually used by electrical equipment to operate. This is the power that allows machines, tools, or lighting systems to function.<\/p>\n\n\n\n<p>The <strong>kilovolt-ampere (kVA)<\/strong> represents <strong>apparent power<\/strong>. It is the total power supplied by a source, including both useful power and losses due to the electrical system\u2019s operation.<\/p>\n\n\n\n\n\n\n\n<p>In simpler terms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>kW: power actually consumed by the equipment<\/strong><\/li>\n\n\n\n<li><strong>kVA: total power supplied by the generator<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This distinction is important because a generator must always be able to supply <strong>more apparent power than the real power used<\/strong>.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">The role of the <mark class=\"has-inline-color has-primary-color\">power factor<\/mark><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.ekonity.com\/wp-content\/uploads\/2026\/03\/Capture-decran-2026-03-13-121402.png\" alt=\"\" class=\"wp-image-1076\" style=\"aspect-ratio:1.6416464891041163;width:366px;height:auto\" \/><\/figure>\n<\/div>\n\n\n<p>The relationship between kVA and kW depends on a parameter called the <strong>power factor<\/strong>.<\/p>\n\n\n\n<p>The power factor measures how efficiently electrical energy is used in a system. Its value ranges from <strong>0 to 1<\/strong>. The closer it is to 1, the more efficiently the energy is used.<\/p>\n\n\n\n<p>In most industrial installations or construction sites, a <strong>power factor of 0.8<\/strong> is commonly used.<\/p>\n\n\n\n<p>The relationship between the two units is therefore:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong><mark class=\"has-inline-color has-primary-color\">kW = kVA \u00d7 power factor<\/mark><\/strong><\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-content-justification-left is-layout-flex wp-container-core-group-is-layout-c0ca7d81 wp-block-group-is-layout-flex\">\n<h3 class=\"wp-block-heading\">Simple example<\/h3>\n\n\n\n<p>Let\u2019s take a <strong>100 kVA<\/strong> generator with a <strong>0.8 power factor<\/strong>:<\/p>\n\n\n\n<p>100 \u00d7 0.8 = <strong>80 kW<\/strong><\/p>\n\n\n\n<p>This means the generator can deliver <strong>80 kW of usable real power<\/strong>.<\/p>\n<\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Why are <mark class=\"has-inline-color has-primary-color\">generators rated in kVA<\/mark>?<\/h2>\n\n\n\n<p>Generator manufacturers generally use <strong>kVA<\/strong> to indicate the power of their equipment.<\/p>\n\n\n\n<p>The reason is simple: a generator must handle not only the useful power but also electrical variations caused by loads, especially those from motors or certain industrial equipment.<\/p>\n\n\n\n<p>Expressing power in kVA ensures that the generator can <strong>absorb load variations and operate without overload<\/strong>.<\/p>\n\n\n\n<p>This is particularly important in environments such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>construction sites<\/li>\n\n\n\n<li>industrial facilities<\/li>\n\n\n\n<li>temporary events<\/li>\n\n\n\n<li>telecom infrastructures<\/li>\n\n\n\n<li>mobile energy systems<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How to choose <mark class=\"has-inline-color has-primary-color\">the right generator size<\/mark>?<\/h2>\n\n\n\n<p>Choosing a generator is not just about adding up equipment power. Several factors must be considered to avoid surprises.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Calculate total equipment power<\/h3>\n\n\n\n<p>First, add up the power of all equipment to be supplied, expressed in kW.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Consider starting power requirements<\/h3>\n\n\n\n<p>Some equipment, especially electric motors, require <strong>much higher power at startup<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Include the power factor<\/h3>\n\n\n\n<p>An installation with a low power factor will need <strong>more kVA to deliver the same useful power<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Allow a safety margin<\/h3>\n\n\n\n<p>It is generally recommended to provide <strong>10\u201320% additional power<\/strong> to anticipate load changes or consumption peaks.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Concrete example <mark class=\"has-inline-color has-primary-color\">on a construction site<\/mark><\/h2>\n\n\n\n<p>Consider a site with the following equipment:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>compressor: <strong>30 kW<\/strong><\/li>\n\n\n\n<li>lighting: <strong>10 kW<\/strong><\/li>\n\n\n\n<li>power tools: <strong>15 kW<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Total power is therefore <strong>55 kW<\/strong>.<\/p>\n\n\n\n<p>With a <strong>0.8 power factor<\/strong>, the required apparent power is:<\/p>\n\n\n\n<p>55 \/ 0.8 = <strong>68.75 kVA<\/strong><\/p>\n\n\n\n<p>In this case, it is preferable to use <strong>a generator of around 70 kVA<\/strong> to ensure stable operation.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">The importance of <mark class=\"has-inline-color has-primary-color\">proper sizing<\/mark><\/h2>\n\n\n\n<p>An incorrectly sized generator can cause several problems:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>excess fuel consumption<\/li>\n\n\n\n<li>premature equipment wear<\/li>\n\n\n\n<li>power outages or instability<\/li>\n\n\n\n<li>reduced overall performance<\/li>\n<\/ul>\n\n\n\n<p>Conversely, a correctly sized generator provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>better energy efficiency<\/li>\n\n\n\n<li>lower operating costs<\/li>\n\n\n\n<li>greater system reliability<\/li>\n<\/ul>\n\n\n\n<p>These considerations are even more critical today with the rise of <strong>hybrid and intelligent energy solutions<\/strong>, capable of automatically optimizing energy production and consumption.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><mark class=\"has-inline-color has-primary-color\">Conclusion<\/mark><\/h2>\n\n\n\n<p>The distinction between <strong>kVA and kW<\/strong> is essential for correctly sizing a generator.<\/p>\n\n\n\n<p>In summary:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>kW corresponds to the actual power used<\/strong><\/li>\n\n\n\n<li><strong>kVA represents the total power supplied by the system<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Mastering this difference allows you to <strong>choose the right equipment, optimize energy performance, and ensure reliable installations<\/strong>.<\/p>\n\n\n\n<p>In a context where mobile energy needs are rapidly evolving (more demanding sites, energy transition, emission reductions, and operating cost optimization), it is essential to rely on <strong>smarter, more efficient, and properly sized energy solutions<\/strong>.<\/p>\n\n\n\n<p>At <strong>Ekonity<\/strong>, we assist professionals in <strong>sizing and optimizing their mobile energy solutions<\/strong>, integrating new hybrid technologies that reduce fuel consumption, emissions, and noise.<\/p>\n\n\n\n<p>If you want to <strong>properly size a generator, optimize your energy setup, or explore a more efficient solution<\/strong>, our team can help analyze your needs.<\/p>\n\n\n\n<p>Contact <a href=\"https:\/\/www.ekonity.com\/contact\/\">Ekonity<\/a> to discuss your project and find the energy solution best suited to your activity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding the difference between kVA and kW is essential for selecting the right size of generator. Find out how to calculate active and reactive power, optimise your energy systems and avoid overloads. Ekonity is here to help you choose the solution best suited to your needs.<\/p>\n","protected":false},"author":2,"featured_media":237,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,4],"tags":[],"class_list":["post-235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe","category-tips-and-tutorials"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is the difference between kW and kVA? 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