{"id":142,"date":"2026-08-27T20:25:27","date_gmt":"2026-08-27T20:25:27","guid":{"rendered":"https:\/\/axtron.group\/blog\/?p=142"},"modified":"2026-08-27T20:55:41","modified_gmt":"2026-08-27T20:55:41","slug":"how-to-size-a-solar-inverter-battery-system","status":"publish","type":"post","link":"https:\/\/axtron.group\/blog\/energy-management\/how-to-size-a-solar-inverter-battery-system\/","title":{"rendered":"How to Size a Solar, Inverter &amp; Battery System"},"content":{"rendered":"\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-260dca5f wp-block-columns-is-layout-flex\" style=\"margin-top:0;margin-bottom:0\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-superbfont-large-font-size\">How to Size a UPS for your Project<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What size inverter, battery and solar system do I need?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is one of the most common questions from homeowners and businesses considering <strong>solar power in Ghana<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The mistake is trying to answer it with one number.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A properly sized solar and backup system needs to answer three different questions:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How much power do you need?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How much energy do you use?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How long do you need backup?<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:0;padding-bottom:0;padding-left:0\">\n<div><div class=\"wp-block-image is-style-default\">\n<figure class=\"alignleft size-full has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1702\" src=\"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-scaled.jpg\" alt=\"\" class=\"wp-image-80\" style=\"border-radius:20px\" srcset=\"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-scaled.jpg 2560w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-300x199.jpg 300w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-1024x681.jpg 1024w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-768x511.jpg 768w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-1536x1021.jpg 1536w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-2048x1362.jpg 2048w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg006-850x565.jpg 850w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-small);margin-bottom:var(--wp--preset--spacing--superbspacing-small);padding-top:var(--wp--preset--spacing--superbspacing-xxlarge);padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:var(--wp--preset--spacing--superbspacing-xxlarge);padding-left:var(--wp--preset--spacing--superbspacing-small)\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-b15c4938 wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-3b3b0ade wp-block-columns-is-layout-flex\" style=\"margin-top:0;margin-bottom:0;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Decide Why You Want Solar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before calculating panels or batteries, decide what you actually want the system to achieve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your priority may be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Backup during power outages<\/li>\n\n\n\n<li>Lower electricity bills<\/li>\n\n\n\n<li>Reduced generator fuel consumption<\/li>\n\n\n\n<li>Solar power during the day<\/li>\n\n\n\n<li>Backup for critical equipment<\/li>\n\n\n\n<li>Whole-building backup<\/li>\n\n\n\n<li>Greater energy independence<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>battery backup system<\/strong>, <strong>solar-only system<\/strong> and <strong>solar + battery system<\/strong> can be very different even when they serve the same building.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Check Whether Your Building Is Single or Three Phase<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Your building&#8217;s electrical supply matters when selecting the inverter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A small home may be single phase, while larger homes and many commercial buildings use three-phase power.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For three-phase installations, the system should consider both total demand and how the loads are distributed across the phases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Large three-phase equipment must also be identified separately.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Calculate Your Maximum Power Demand<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The inverter must be large enough to operate the equipment that may run simultaneously.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is measured in <strong>kW or kVA<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Air conditioners, pumps, refrigerators and motors may also require additional power briefly when they start.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern storage inverters can often provide substantially more than their continuous rating for a short period, so a momentary motor-starting surge does not always mean the inverter needs to be permanently oversized.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The actual inverter overload specification still needs to be verified before final selection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Calculate Your Daily Energy Use<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Solar and battery sizing also require <strong>kWh<\/strong>, not just kW.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 1kW appliance running for 5 hours consumes:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1kW \u00d7 5 hours = 5kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That means two homes with the same maximum load can require completely different solar and battery capacities if one uses its appliances for much longer each day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why a good <strong>solar sizing calculator<\/strong> asks both equipment wattage and expected operating hours.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Size the Battery for the Backup Time You Need<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Battery size depends on:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>average protected load \u00d7 required backup time.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your backed-up equipment averages 3kW and you want approximately four hours of backup, the starting energy requirement is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3kW \u00d7 4 hours = 12kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The actual battery bank will need to be larger because battery capacity, usable depth of discharge and inverter losses must also be considered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lithium and lead-acid batteries should not be treated identically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Size Solar Panels Using Local Solar Production<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Solar panel sizing should not simply assume that every 1kW of panels generates 1kW all day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Actual solar production changes with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Location<\/li>\n\n\n\n<li>Month<\/li>\n\n\n\n<li>Weather<\/li>\n\n\n\n<li>Panel orientation<\/li>\n\n\n\n<li>Temperature<\/li>\n\n\n\n<li>Shading<\/li>\n\n\n\n<li>System losses<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, our <strong>Solar Sizing Calculator<\/strong> uses location-based monthly solar-production data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rather than sizing only from an annual average, the calculator can look at the <strong>lower-producing months<\/strong> and estimate the PV capacity needed to meet the selected energy requirement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This produces a more useful preliminary solar size for homes and businesses.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Solar, Battery and Inverter Sizes Are Different<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Remember:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Inverter kW\/kVA<\/strong> determines how much equipment can operate at once.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Battery kWh<\/strong> determines how long your equipment can operate without another power source.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solar kWp<\/strong> determines how much solar energy can be produced.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A properly designed system balances all three.<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group alignfull\" style=\"margin-top:0;margin-bottom:0;padding-top:var(--wp--preset--spacing--superbspacing-medium);padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:var(--wp--preset--spacing--superbspacing-large);padding-left:var(--wp--preset--spacing--superbspacing-small)\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-7daff50c wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading has-text-align-center has-contrast-color has-text-color has-superbfont-large-font-size\">Use Our Solar &amp; Inverter Sizing Calculator<\/h2>\n\n\n\n<div class=\"wp-block-group alignwide is-vertical is-content-justification-center is-layout-flex wp-container-core-group-is-layout-6a3c724d wp-block-group-is-layout-flex\" style=\"border-radius:20px;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">\n<div class=\"wp-block-group is-content-justification-center\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-f4748acb wp-block-group-is-layout-constrained\">\n<p class=\"wp-block-paragraph\">Use our free <strong>Solar, Inverter &amp; Battery Sizing Calculator for Ghana<\/strong> to enter your appliances, operating hours, building phase and required backup time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The tool estimates your <strong>inverter size, battery capacity and solar PV requirement<\/strong> to give you a practical starting point before purchasing or installing a system.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/axtron.group\/store\/power-sizing-tools\/\" target=\"_blank\" rel=\"noopener\">Generator Sizing Calculator<\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group\" style=\"padding-top:var(--wp--preset--spacing--superbspacing-small)\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-845efc53 wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column has-mono-4-background-color has-background is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-top:var(--wp--preset--spacing--superbspacing-small);padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:var(--wp--preset--spacing--superbspacing-small);padding-left:var(--wp--preset--spacing--superbspacing-small)\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"80\" src=\"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/img-icon-4.png\" alt=\"\" class=\"wp-image-145\" style=\"object-fit:cover;width:48px;height:48px\"\/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-mono-1-color has-text-color has-link-color has-superbfont-medium-font-size wp-elements-1\" style=\"margin-top:0;margin-bottom:0\">Email Support<\/h3>\n\n\n\n<p class=\"has-text-align-center has-mono-2-color has-text-color has-superbfont-xsmall-font-size wp-block-paragraph\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xxsmall);margin-bottom:0\"><strong>support@axtrongroup.com<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column has-mono-4-background-color has-background is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-top:var(--wp--preset--spacing--superbspacing-small);padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:var(--wp--preset--spacing--superbspacing-small);padding-left:var(--wp--preset--spacing--superbspacing-small)\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"61\" height=\"60\" src=\"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/icon-mobile.png\" alt=\"\" class=\"wp-image-144\" style=\"object-fit:cover;width:48px;height:48px\"\/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-mono-1-color has-text-color has-superbfont-medium-font-size\" style=\"margin-top:0;margin-bottom:0\">Phone Support<\/h3>\n\n\n\n<p class=\"has-text-align-center has-mono-2-color has-text-color has-superbfont-xsmall-font-size wp-block-paragraph\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xxsmall);margin-bottom:0\"><strong>+233(0)50 364 7036<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group alignfull\" style=\"margin-top:0;margin-bottom:0;padding-top:var(--wp--preset--spacing--superbspacing-xxlarge);padding-right:var(--wp--preset--spacing--superbspacing-medium);padding-bottom:var(--wp--preset--spacing--superbspacing-xxlarge);padding-left:var(--wp--preset--spacing--superbspacing-medium)\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-7e3202bb wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group alignwide\" style=\"margin-top:0;margin-bottom:var(--wp--preset--spacing--superbspacing-large);padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-image is-style-default\">\n<figure class=\"aligncenter size-full has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"853\" height=\"258\" src=\"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/blg016-Large-edited.jpeg\" alt=\"\" class=\"wp-image-143\" style=\"border-radius:20px\" srcset=\"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/blg016-Large-edited.jpeg 853w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/blg016-Large-edited-300x91.jpeg 300w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/blg016-Large-edited-768x232.jpeg 768w, https:\/\/axtron.group\/blog\/wp-content\/uploads\/2026\/08\/blg016-Large-edited-850x257.jpeg 850w\" sizes=\"auto, (max-width: 853px) 100vw, 853px\" \/><\/figure>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left has-contrast-color has-text-color has-superbfont-large-font-size\">Final thought \u2014 design around how you actually use power<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-superbfont-small-font-size wp-block-paragraph\">The best solar and inverter system is not necessarily the one with the most panels or the largest battery. It is the one that matches how much power you use, when you use it and what you want the system to achieve. Start with the real load, decide how much backup you need, then size the inverter, battery and solar array as one complete system. That balance gives you better reliability, better value and a system that works the way you expect.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What size inverter, battery and solar system do I need?<\/p>\n<p>This is one of the most common questions from homeowners and businesses considering solar power in Ghana.<\/p>\n<p>The mistake is trying to answer it with one number.<\/p>\n<p>A properly sized solar and backup system needs to answer three different questions:<\/p>\n<p>How much power do you need?<\/p>\n<p>How much energy do you use?<\/p>\n<p>How long do you need backup?<\/p>\n","protected":false},"author":1,"featured_media":76,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[23,68,67,66,10,21],"tags":[49,91,97,98,94,90,95,99,96,93,92,89],"class_list":["post-142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energy-management","category-guides-resources","category-industry-technology","category-power-backup-systems","category-renewable-energy-insights","category-solar-solutions","tag-backup-power","tag-battery-storage","tag-energy-storage","tag-ghana-solar","tag-hybrid-inverter","tag-inverter-sizing","tag-lithium-battery","tag-renewable-energy","tag-solar-calculator","tag-solar-energy","tag-solar-pv","tag-solar-sizing"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/axtron.group\/blog\/wp-content\/uploads\/2025\/10\/blg004-scaled-e1759366445448.jpg","_links":{"self":[{"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/posts\/142","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/comments?post=142"}],"version-history":[{"count":1,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/posts\/142\/revisions"}],"predecessor-version":[{"id":146,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/posts\/142\/revisions\/146"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/media\/76"}],"wp:attachment":[{"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/media?parent=142"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/categories?post=142"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/axtron.group\/blog\/wp-json\/wp\/v2\/tags?post=142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}