{"id":8708,"date":"2025-06-30T09:18:51","date_gmt":"2025-06-30T05:48:51","guid":{"rendered":"https:\/\/nilniroo.com\/%d8%b1%d8%a7%d9%87%d9%86%d9%85%d8%a7%db%8c-%d8%b3%d8%a7%db%8c%d8%b2%db%8c%d9%86%da%af-%d9%88-%d9%85%d8%ad%d8%a7%d8%b3%d8%a8%d9%87-%d8%aa%d9%88%d8%a7%d9%86-%d9%88-%d8%b8%d8%b1%d9%81%db%8c%d8%aa-%d8%af\/"},"modified":"2026-04-13T10:41:54","modified_gmt":"2026-04-13T07:11:54","slug":"diesel-generator-power-calculation","status":"publish","type":"post","link":"https:\/\/nilniroo.com\/en\/diesel-generator-power-calculation\/","title":{"rendered":"Diesel Generator Sizing and Power Capacity Calculation Guide"},"content":{"rendered":"

Calculating the power and capacity of a diesel generator\u2014or performing accurate diesel generator sizing<\/strong>\u2014is one of the most critical steps in designing standby and prime power systems. At Rastak Power Industries<\/strong>, our team provides free consultation<\/strong> for all customers and projects based on years of technical knowledge and practical experience. Choosing the right generator capacity increases efficiency, reduces maintenance costs, and optimizes fuel consumption.
This article explains how to size a diesel generator and includes power conversion tables<\/strong> to assist engineers and users.<\/p>\n

1. Determining the Required Electrical Load<\/strong><\/h3>\n

Before selecting a generator, you must first calculate the total electrical load<\/strong>.
This involves estimating the power consumption of all devices and equipment that will be powered by the generator.<\/p>\n

2. Identifying the Type of Load<\/strong><\/h3>\n

Electrical loads generally fall into three main categories:<\/p>\n

    \n
  • \n

    Resistive Loads:<\/strong> such as incandescent lamps and heating elements.<\/p>\n<\/li>\n

  • \n

    Inductive Loads:<\/strong> such as motors, transformers, and air conditioning systems.<\/p>\n<\/li>\n

  • \n

    Capacitive Loads:<\/strong> such as certain types of switch-mode power supplies.<\/p>\n<\/li>\n<\/ul>\n

    Note:<\/strong> Inductive loads have high starting currents and therefore require generators with higher capacities.<\/p>\n

    3. Power Factor (PF)<\/strong><\/h3>\n

    Generators are typically designed with a power factor of 0.8<\/strong>.
    To calculate the real power, use the following formula:<\/p>\n

    KW = KVA * PF<\/p>\n

    4. Choosing the Right Diesel Generator<\/strong><\/h3>\n

    When selecting a diesel generator, consider the following factors:<\/p>\n

      \n
    • \n

      Environmental conditions:<\/strong> temperature, altitude, and humidity<\/p>\n<\/li>\n

    • \n

      Application type:<\/strong> standby, prime, or continuous operation<\/p>\n<\/li>\n

    • \n

      Overload requirements:<\/strong> some equipment may require temporary overload capability<\/p>\n<\/li>\n<\/ul>\n

      Power Conversion Tables<\/strong><\/h3>\n

      1. kVA to kW and Amperes Conversion<\/strong><\/h4>\n
      \n
      \n\n\n\n\n\n\n\n\n\n\n
      Amp (400V-3P)<\/th>\nAmp (230V-1P)<\/th>\nkW (PF=0.8)<\/th>\nkVA<\/th>\n<\/tr>\n<\/thead>\n
      14.4<\/td>\n43.5<\/td>\n8<\/td>\n10<\/td>\n<\/tr>\n
      28.9<\/td>\n87<\/td>\n16<\/td>\n20<\/td>\n<\/tr>\n
      72.3<\/td>\n217.5<\/td>\n40<\/td>\n50<\/td>\n<\/tr>\n
      144.6<\/td>\n435<\/td>\n80<\/td>\n100<\/td>\n<\/tr>\n
      289.2<\/td>\n870<\/td>\n160<\/td>\n200<\/td>\n<\/tr>\n
      723<\/td>\n2175<\/td>\n400<\/td>\n500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

      2. Kilowatt to Horsepower (HP) Conversion<\/strong><\/h4>\n

      Horsepower is a common unit for describing the power of generator engines.
      Use the following formula to convert:<\/p>\n

      HP= KW * 1.341<\/h3>\n
      \n
      \n\n\n\n\n\n\n\n\n\n\n
      HP<\/th>\nKW<\/th>\n<\/tr>\n<\/thead>\n
      13.41<\/td>\n10<\/td>\n<\/tr>\n
      26.82<\/td>\n20<\/td>\n<\/tr>\n
      67.05<\/td>\n50<\/td>\n<\/tr>\n
      134.1<\/td>\n100<\/td>\n<\/tr>\n
      268.2<\/td>\n200<\/td>\n<\/tr>\n
      670.5<\/td>\n500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

      3. Watt to Ampere Conversion<\/strong><\/h4>\n

      To convert power (W)<\/strong> to current (A)<\/strong>, use the formula:<\/p>\n

      A= W\/V<\/h3>\n
      \n
      \n\n\n\n\n\n\n\n\n
      Current (A) at 400V<\/th>\nCurrent (A) at 230V<\/th>\nPower (W)<\/th>\n<\/tr>\n<\/thead>\n
      2.5<\/td>\n4.35<\/td>\n1,000<\/td>\n<\/tr>\n
      12.5<\/td>\n21.7<\/td>\n5,000<\/td>\n<\/tr>\n
      25<\/td>\n43.5<\/td>\n10,000<\/td>\n<\/tr>\n
      125<\/td>\n217.4<\/td>\n50,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

      Conclusion<\/strong><\/h3>\n

      Proper sizing of a diesel generator requires a detailed analysis of load demand, equipment type, environmental conditions, and applicable standards.
      Using power conversion tables<\/strong> helps engineers and technicians make accurate generator selections.<\/p>\n

      At Rastak Power Industries<\/strong>, our experienced technical experts are always ready to provide consultation and support<\/strong> to ensure you select the most efficient and reliable diesel generator for your application.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Calculating the power and capacity of a diesel generator\u2014or performing accurate diesel generator sizing\u2014is one of the most critical steps in designing standby and prime power systems. At Rastak Power…<\/p>\n","protected":false},"author":1,"featured_media":10269,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[179],"tags":[],"content_types":[],"class_list":["post-8708","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en"],"_links":{"self":[{"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/posts\/8708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/comments?post=8708"}],"version-history":[{"count":3,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/posts\/8708\/revisions"}],"predecessor-version":[{"id":9109,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/posts\/8708\/revisions\/9109"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/media\/10269"}],"wp:attachment":[{"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/media?parent=8708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/categories?post=8708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/tags?post=8708"},{"taxonomy":"content_types","embeddable":true,"href":"https:\/\/nilniroo.com\/en\/wp-json\/wp\/v2\/content_types?post=8708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}