{"id":5071,"date":"2020-03-27T09:25:39","date_gmt":"2020-03-27T09:25:39","guid":{"rendered":"https:\/\/www.mppsolar.com\/v3\/?p=5071"},"modified":"2020-11-25T07:05:53","modified_gmt":"2020-11-25T07:05:53","slug":"system-sizing","status":"publish","type":"post","link":"https:\/\/www.mppsolar.com\/v3\/system-sizing\/","title":{"rendered":"System Sizing Guide"},"content":{"rendered":"<div id=\"s3gt_translate_tooltip_mini\" class=\"s3gt_translate_tooltip_mini_box\">\n<div id=\"s3gt_translate_tooltip_mini_logo\" class=\"s3gt_translate_tooltip_mini\" title=\"Translate selected text\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5074\" src=\"https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemsizing.jpg\" alt=\"\" width=\"750\" height=\"80\" srcset=\"https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemsizing.jpg 750w, https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemsizing-300x32.jpg 300w, https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemsizing-600x64.jpg 600w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/div>\n<\/div>\n<hr \/>\n<div title=\"Play\"><\/div>\n<div title=\"Play\">\n<div class=\"shortcode1-2\"><p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5076 aligncenter\" src=\"https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemwiring.jpg\" alt=\"\" width=\"318\" height=\"307\" srcset=\"https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemwiring.jpg 1387w, https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemwiring-300x290.jpg 300w, https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemwiring-1024x989.jpg 1024w, https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemwiring-768x742.jpg 768w, https:\/\/www.mppsolar.com\/v3\/wp-content\/uploads\/2020\/03\/systemwiring-600x580.jpg 600w\" sizes=\"auto, (max-width: 318px) 100vw, 318px\" \/><\/div>\n<div title=\"Play\">\n<\/div>\n<\/div>\n<div title=\"Play\">\n<div class=\"shortcode1-2\"><\/div>\n<div class=\"s3gt_translate_tooltip_mini\" title=\"Play\">When it comes to Off-Grid System Sizing, the most important and common questions every system designer faces are as follows:<\/div>\n<div title=\"Play\">\n<div class=\"shortcode-list shortcode-list-check\"><\/p>\n<ul>\n<li><strong>*How big of a solar array should I install?<\/strong><\/li>\n<li><strong>*How big of a battery bank should I install?<\/strong><\/li>\n<\/ul>\n<p><\/div>\n<\/div>\n<div title=\"Play\">These questions may seem difficult but can be answered by using simple arithmetic operations in the color boxes below.\u00a0 Solar array sizing will requires one to first calculate the total energy (in watt-hour or Kilo-watt-hour) first and divided by the number of peak sun hours on site.\u00a0 Battery bank sizing also starts the same way with figuring out total energy requirement first, but will also need to consider total back up days in case there&#8217;s no sun as well as the maximum DOD (depth of discharge) on battery.<\/div>\n<div title=\"Play\">\n<\/div>\n<\/div>\n<hr \/>\n<div title=\"Play\">\n<div class=\"message-box-wrapper yellow\"><div class=\"message-box-title\">Solar Array Sizing Calculation<\/div><div class=\"message-box-content\"><\/div>\n<div title=\"Play\">\n<p><strong>W = E \u00f7 G \u00f7 K<sub>sys<\/sub><\/strong><\/p>\n<p>Where<br \/>\nW<sub>\u00a0 <\/sub>= peak wattage of the array required in Watt<br \/>\nE = daily energy requirement in Watt-hours (Wh)<br \/>\nG = average daily number of <a href=\"https:\/\/www.google.com\/search?client=firefox-b-d&amp;q=peak+sun+hours\"><span style=\"color: #0000ff;\">peak sun hours<\/span><\/a> on site<br \/>\nK<sub>sys<\/sub> = total system efficiency factor which includes efficiency losses in all system components such as PV, inverter, charge controller, battery, and wiring loss. (varies but may use 0.7 as average)<\/p>\n<\/div><\/div>\n<\/div>\n<div title=\"Play\">\n<div class=\"message-box-wrapper green\"><div class=\"message-box-title\">Battery Bank Sizing Calculation<\/div><div class=\"message-box-content\"><\/div>\n<div title=\"Play\">\n<p><strong>Q = ( E x A ) \u00f7 ( V x T x K<sub>inv <\/sub>x K<sub>cable <\/sub>)<\/strong><\/p>\n<p>Q = minimum battery capacity required in amp-hours (Ah)<br \/>\nE = the daily energy requirement in Watt-hours (Wh)<br \/>\nA = the number of days of backup required<br \/>\nV = the system DC voltage (V)<br \/>\nT = the maximum allowable DOD (Depth of Discharge) of the battery (recommended by battery supplier)<br \/>\nK<sub>inv<\/sub> = inverter efficiency\u2014this is 1 if there is no inverter<br \/>\nK<sub>cable\u00a0 <\/sub>= the efficiency of the cables delivering the power from battery to loads (typically 95-97% based on 3-5% loss)<\/p>\n<\/div>\n<div title=\"Play\">\n<\/div><\/div>\n<\/div>\n<div title=\"Play\">\n<p>&nbsp;<\/p>\n<\/div>\n<div id=\"s3gt_translate_tooltip_mini\" class=\"s3gt_translate_tooltip_mini_box\">\n<div id=\"s3gt_translate_tooltip_mini_copy\" class=\"s3gt_translate_tooltip_mini\" title=\"Copy text to Clipboard\">\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp; &nbsp;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64],"tags":[58],"class_list":["post-5071","post","type-post","status-publish","format-standard","hentry","category-reference","tag-reference"],"_links":{"self":[{"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/posts\/5071","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/comments?post=5071"}],"version-history":[{"count":0,"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/posts\/5071\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/media?parent=5071"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/categories?post=5071"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mppsolar.com\/v3\/wp-json\/wp\/v2\/tags?post=5071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}