{"id":2396,"date":"2026-11-04T05:59:45","date_gmt":"2026-11-04T05:59:45","guid":{"rendered":"https:\/\/ovartech.com\/?p=2396"},"modified":"2026-11-04T06:17:37","modified_gmt":"2026-11-04T06:17:37","slug":"1kw-1-5kw-2kw-3kw-on-board-dc-dc-selection-guide","status":"publish","type":"post","link":"https:\/\/ovartech.com\/fa\/1kw-1-5kw-2kw-3kw-on-board-dc-dc-selection-guide\/","title":{"rendered":"1kW \/ 1.5kW \/ 2kW \/ 3kW On-Board DC-DC Selection Guide: Matching Power to Vehicle Low-Voltage Loads"},"content":{"rendered":"<h1 style=\"text-align: center;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 18pt;\">1kW \/ 1.5kW \/ 2kW \/ 3kW On-Board DC-DC Selection Guide: Matching Power to Vehicle Low-Voltage Loads<\/span><\/h1>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Selecting the correct on-board DC-DC converter power rating \u2014 1 kW, 1.5 kW, 2 kW, or 3 kW \u2014 requires accurately matching the converter\u2019s continuous and peak output capability to the vehicle\u2019s total low-voltage (12 V \/ 24 V) electrical load.<\/strong> Undersizing leads to voltage drops, battery drain, or system shutdowns, while oversizing increases cost, weight, and standby losses. A systematic load analysis is the foundation of proper DC-DC selection.<\/span><\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><a href=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr.jpg\"><img decoding=\"async\" class=\"lazyload wp-image-2399 size-fusion-800 aligncenter\" src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-800x537.jpg\" data-orig-src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-800x537.jpg\" alt=\"On-Board DC-DC\" width=\"800\" height=\"537\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27800%27%20height%3D%27537%27%20viewBox%3D%270%200%20800%20537%27%3E%3Crect%20width%3D%27800%27%20height%3D%27537%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-18x12.jpg 18w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-200x134.jpg 200w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-300x201.jpg 300w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-400x268.jpg 400w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-500x336.jpg 500w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-600x403.jpg 600w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-700x470.jpg 700w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-768x516.jpg 768w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-800x537.jpg 800w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr-1024x687.jpg 1024w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/6nqmr.jpg 1168w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">1. Why Accurate Power Matching Matters<\/span><\/strong><\/h2>\n<p>In electric and hybrid vehicles, the high-voltage battery is the primary energy source. The DC-DC converter continuously steps this voltage down to supply the entire low-voltage network. Typical loads include:<\/p>\n<ul>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Body control modules, ECUs, and sensors<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Lighting (interior and exterior)<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Infotainment and instrument cluster<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Electric pumps, fans, and compressors<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Safety systems (ABS, airbags, ADAS)<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Always-on loads (immobilizer, telematics, keyless entry)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">The sum of these loads under worst-case conditions determines the minimum continuous power the DC-DC must deliver. Peak loads (e.g., simultaneous activation of multiple high-power devices) define the required short-term capability.<\/span><\/p>\n<h3><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">2. Typical Power Ratings and Their Application Range<\/span><\/strong><\/h3>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><a href=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ.jpg\"><img decoding=\"async\" class=\"lazyload wp-image-2403 size-fusion-800 aligncenter\" src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-800x450.jpg\" data-orig-src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-800x450.jpg\" alt=\"\" width=\"800\" height=\"450\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27800%27%20height%3D%27450%27%20viewBox%3D%270%200%20800%20450%27%3E%3Crect%20width%3D%27800%27%20height%3D%27450%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-18x10.jpg 18w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-200x113.jpg 200w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-300x169.jpg 300w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-400x225.jpg 400w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-500x281.jpg 500w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-600x338.jpg 600w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-700x394.jpg 700w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-768x432.jpg 768w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-800x450.jpg 800w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-1024x576.jpg 1024w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ-1200x675.jpg 1200w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/AjlvQ.jpg 1280w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Ovar Tech offers a full range of automotive DC-DC converters at 1 kW, 1.5 kW, 2 kW, and 3 kW, as well as integrated OBC + DC-DC modules that combine charging and low-voltage power supply functions.<\/span><\/p>\n<h4><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">3. Step-by-Step Load Matching Method<\/span><\/strong><\/h4>\n<p><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Step 1: List all low-voltage loads<\/span><\/strong><br \/>\n<span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Create a comprehensive bill of electrical loads with their nominal and maximum current draw.<\/span><\/p>\n<p><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Step 2: Apply duty cycles and coincidence factors<\/span><\/strong><br \/>\n<span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Not all loads operate simultaneously. Use realistic coincidence factors (typically 0.6\u20130.85 for passenger cars) to calculate average and peak demand.<\/span><\/p>\n<p><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Step 3: Add safety margin<\/span><\/strong><br \/>\n<span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Apply a 20\u201330 % continuous power margin and a higher short-term peak margin to cover aging, temperature effects, and future load growth.<\/span><\/p>\n<p><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Step 4: Consider voltage platform<\/span><\/strong><br \/>\n<span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">12 V systems are standard for passenger cars; 24 V is common in commercial vehicles and some construction equipment. Power ratings scale accordingly.<\/span><\/p>\n<p><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Step 5: Evaluate thermal and packaging constraints<\/span><\/strong><br \/>\n<span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Higher-power units require better cooling (air or liquid) and more installation space.<\/span><\/p>\n<h5><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">4. Selection Guidelines by Vehicle Category<\/span><\/strong><\/h5>\n<p><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Compact and Entry-Level Passenger EVs<\/span><\/strong><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Total LV load usually stays below 1 kW continuous<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Recommended: 1 kW or 1.5 kW<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Priority: cost and compact size<\/span><\/li>\n<\/ul>\n<p><strong><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Mainstream Passenger Cars and Crossovers<\/span><\/strong><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Growing electrical content (more ECUs, ADAS, comfort features)<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Recommended: 1.5 kW or 2 kW<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">1.5 kW is often the sweet spot for cost and performance<\/span><\/li>\n<\/ul>\n<p><strong><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Large SUVs, Premium Vehicles, and Light Commercial Vans<\/span><\/strong><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Higher continuous and peak loads<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Recommended: 2 kW or 3 kW<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Extra margin supports future feature additions<\/span><\/li>\n<\/ul>\n<p><strong><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Commercial Vehicles, Buses, and Specialized Equipment<\/span><\/strong><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Frequently use 24 V systems and have heavy auxiliary loads<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Recommended: 2 kW or 3 kW (or higher customized units)<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: arial, helvetica, sans-serif;\">Emphasis on ruggedness and high reliability<\/span><\/li>\n<\/ul>\n<h6><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">5. Additional Selection Factors Beyond Power Rating<\/span><\/h6>\n<ul>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Efficiency<\/strong>: Look for \u2265 92\u201394 % peak efficiency to minimize HV battery drain.<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Standby \/ Quiescent Power<\/strong>: Critical for key-off consumption; modern units should support deep-sleep modes.<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Cooling Method<\/strong>: Air-cooled for lower power; liquid-cooled preferred above 2 kW in many platforms.<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Isolation and Safety<\/strong>: Reinforced isolation is mandatory for HV-to-LV conversion.<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Communication<\/strong>: CAN interface and diagnostic capability are standard requirements.<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Environmental Robustness<\/strong>: Wide temperature range, vibration, and IP rating appropriate to the vehicle.<\/span><\/li>\n<\/ul>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><a href=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr.jpg\"><img decoding=\"async\" class=\"lazyload wp-image-2409 size-fusion-800 aligncenter\" src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-800x537.jpg\" data-orig-src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-800x537.jpg\" alt=\"\" width=\"800\" height=\"537\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27800%27%20height%3D%27537%27%20viewBox%3D%270%200%20800%20537%27%3E%3Crect%20width%3D%27800%27%20height%3D%27537%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-18x12.jpg 18w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-200x134.jpg 200w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-300x201.jpg 300w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-400x268.jpg 400w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-500x336.jpg 500w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-600x403.jpg 600w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-700x470.jpg 700w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-768x516.jpg 768w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-800x537.jpg 800w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr-1024x687.jpg 1024w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/ziBdr.jpg 1168w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h6><strong><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">6. Summary Recommendation Table<\/span><\/strong><\/h6>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\"><a href=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA.jpg\"><img decoding=\"async\" class=\"lazyload wp-image-2410 size-fusion-800 aligncenter\" src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-800x450.jpg\" data-orig-src=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-800x450.jpg\" alt=\"\" width=\"800\" height=\"450\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27800%27%20height%3D%27450%27%20viewBox%3D%270%200%20800%20450%27%3E%3Crect%20width%3D%27800%27%20height%3D%27450%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-18x10.jpg 18w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-200x113.jpg 200w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-300x169.jpg 300w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-400x225.jpg 400w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-500x281.jpg 500w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-600x338.jpg 600w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-700x394.jpg 700w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-768x432.jpg 768w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-800x450.jpg 800w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-1024x576.jpg 1024w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA-1200x675.jpg 1200w, https:\/\/ovartech.com\/wp-content\/uploads\/2026\/11\/4HgvA.jpg 1280w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\"><strong>Conclusion<\/strong><\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14pt;\">Correct DC-DC power selection starts with a thorough understanding of the vehicle\u2019s low-voltage load profile, including continuous, peak, and future growth requirements. The 1 kW, 1.5 kW, 2 kW, and 3 kW ratings cover the vast majority of passenger and light commercial electric vehicles when properly matched. By applying a structured load-analysis process and selecting proven automotive-grade products \u2014 such as the DC-DC range offered by Ovar Tech \u2014 engineers can ensure stable 12 V\/24 V power delivery, optimal efficiency, and long-term system reliability without unnecessary cost or weight.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>1kW \/ 1.5kW \/ 2kW \/ 3kW On-Board DC-DC Selection  [&#8230;]<\/p>","protected":false},"author":2,"featured_media":2399,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[17,126],"tags":[209],"class_list":["post-2396","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-tips-tricks","tag-obc"],"acf":[],"_links":{"self":[{"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/posts\/2396","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/comments?post=2396"}],"version-history":[{"count":15,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/posts\/2396\/revisions"}],"predecessor-version":[{"id":2416,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/posts\/2396\/revisions\/2416"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/media\/2399"}],"wp:attachment":[{"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/media?parent=2396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/categories?post=2396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ovartech.com\/fa\/wp-json\/wp\/v2\/tags?post=2396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}