{"id":3355,"date":"2026-10-20T16:33:40","date_gmt":"2026-10-20T13:33:40","guid":{"rendered":"https:\/\/mits.sa\/%d8%a5%d8%b6%d8%a7%d9%81%d8%a9-%d8%a8%d8%b7%d8%a7%d8%b1%d9%8a%d8%a7%d8%aa-%d9%84%d9%85%d9%86%d8%b8%d9%88%d9%85%d8%a9-%d9%82%d8%a7%d8%a6%d9%85%d8%a9\/"},"modified":"2026-10-20T16:33:40","modified_gmt":"2026-10-20T13:33:40","slug":"add-batteries-to-existing-solar","status":"publish","type":"post","link":"https:\/\/mits.sa\/en\/add-batteries-to-existing-solar\/","title":{"rendered":"Adding batteries to an existing solar system: Is it possible? And what do you need to change?"},"content":{"rendered":"<p>Yes, batteries can often be added to an existing solar system, but the method depends on the inverter. If the inverter is a hybrid that accepts batteries, adding one is simpler: use a battery compatible with its voltage and connection protocol. If it&#039;s a grid-tied inverter, the options are either to add a battery system with a dedicated inverter that connects to the AC power supply, or to replace the inverter with a hybrid one. Before making any decision, determine your objective: nighttime operation, backup power during outages, or both.<\/p>\n<div class=\"mits-box\"><strong>In short:<\/strong><\/p>\n<ul>\n<li>Start by finding out what type of inverter you have: grid-connected only, or hybrid that accepts battery.<\/li>\n<li>Hybrid inverter: Adds a battery that is compatible with it in voltage and connection.<\/li>\n<li>Network-connected inverter: Connect on the AC side to a standalone battery inverter, or replace the inverter.<\/li>\n<li>Battery size is calculated from nighttime consumption or required loads during outages, not from panel size.<\/li>\n<li>The addition requires a review of the protections, cables, and installation location, and it is preferable to have it done by a specialized technician.<\/li>\n<\/ul>\n<\/div>\n<h2>Why do people add batteries later?<\/h2>\n<ul>\n<li><strong>Interruptions:<\/strong> The network-connected system automatically disconnects when the power goes out to protect network technicians, so it is not useful during outages without a battery and backup system.<\/li>\n<li><strong>Night operation:<\/strong> Storing part of the day&#039;s production for use in the evening.<\/li>\n<li><strong>Sensitive loads:<\/strong> Such as refrigerators, cameras, routers, and pumps that cannot tolerate interruption.<\/li>\n<li><strong>Expansion:<\/strong> Increased reliance on solar energy after testing the system.<\/li>\n<\/ul>\n<div class=\"mits-box mits-calc\"><strong>Calculate it yourself:<\/strong> Choose a &quot;split or hybrid&quot; system in the solar energy calculator and specify the devices that operate at night. The calculator will give you the suggested battery capacity after calculating the depth of discharge and the efficiency of the inverter. <a href=\"\/en\/solar-energy-calculator\/\">Open the solar energy calculator<\/a><\/div>\n<h2>First step: Identify your current inverter type<\/h2>\n<table class=\"mits-t\">\n<thead>\n<tr>\n<th>Inverter type<\/th>\n<th>How do you know him?<\/th>\n<th>Battery option<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Hybrid<\/td>\n<td>There is a battery port listed in the data sheet and it appears in the settings.<\/td>\n<td>Add a compatible battery directly<\/td>\n<\/tr>\n<tr>\n<td>On-Grid<\/td>\n<td>Panel input and network output only, no battery port<\/td>\n<td>Connect to an AC power supply with a battery inverter, or replace the inverter.<\/td>\n<\/tr>\n<tr>\n<td>Off-Grid<\/td>\n<td>Originally designed to work with batteries<\/td>\n<td>Increase capacity with batteries compatible with existing ones<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The model name often reveals the type. For example, Huawei and DIY inverters distinguish hybrid models with specific letters in the name, as discussed in my article. <a href=\"\/en\/huawei-sun2000-inverter-guide\/\">Huawei SUN2000 inverters<\/a> \u0648<a href=\"\/en\/deye-hybrid-inverter-guide\/\">DIY hybrid inverters<\/a>.<\/p>\n<h2>The three ways to add batteries<\/h2>\n<h3>1. Battery with existing hybrid inverter (connected to DC side)<\/h3>\n<p>The easiest and cheapest option. Choose a battery:<\/p>\n<ul>\n<li>With a voltage that matches the inverter&#039;s range: low voltage (e.g. 48V) or high voltage depending on the model.<\/li>\n<li>From the list of batteries compatible with the inverter, so that the battery management system communicates with the inverter and adjusts charging and discharging.<\/li>\n<li>With a capacity that matches the maximum charging and discharging current of the inverter.<\/li>\n<\/ul>\n<h3>2. Independent battery inverter on the AC side<\/h3>\n<p>The existing system remains as is, and a separate battery inverter is added, connected to the AC line in the panel. During the day, it charges the battery from surplus power output, and at night or during power outages, it supplies power to the loads. This solution is suitable when the existing inverter is modern and in good working order, and you don&#039;t want to replace it, but it requires a specific design for the electrical panel and identification of the backup loads.<\/p>\n<h3>3. Replacing the inverter with a hybrid inverter<\/h3>\n<p>Keep the panels and chassis and replace only the inverter. This is suitable if your current inverter is old or small, or if you plan to expand the panels as well. You should check that the existing panels are compatible with the input voltage and current of the new inverter.<\/p>\n<h2>What battery capacity do you need?<\/h2>\n<p>The battery capacity is calculated based on the energy you want to use from storage, not the size of the panels. Steps:<\/p>\n<ol>\n<li>Specify which loads will operate from the battery: at night, or during outages only.<\/li>\n<li>Calculate its consumption in kilowatt-hours: Power \u00d7 Hours of operation.<\/li>\n<li>Divide by the battery&#039;s allowable depth of discharge and the inverter&#039;s efficiency.<\/li>\n<li>Make sure the panels produce enough daytime power for both daytime loads and battery charging.<\/li>\n<\/ol>\n<h3>Illustrative example<\/h3>\n<p>A house with a network-connected system needs to have its lights, refrigerator, router, and cameras running during a 4-hour power outage. (Approximate figures:)<\/p>\n<ul>\n<li>Lighting 150 watts, refrigerator average 100 watts with compressor malfunction, router and cameras 60 watts: total approximately 310 watts.<\/li>\n<li>4 hours x 310 watts \u2248 1.24 kilowatt-hours.<\/li>\n<li>After dividing by the discharge depth of 90% and the efficiency of 95%: approximately 1.45 kWh.<\/li>\n<li>A battery with a capacity of 2.5 to 5 kWh covers this with a good margin.<\/li>\n<\/ul>\n<p>However, if the goal is to run the air conditioner at night, the capacity increases significantly, and it is preferable to calculate it in <a href=\"\/en\/solar-calculator-guide\/\">Solar Energy Calculator<\/a>The manual method in the article <a href=\"\/en\/solar-battery-sizing\/\">Calculating battery capacity for nighttime operation<\/a>.<\/p>\n<h2>What should be reviewed before adding?<\/h2>\n<ul>\n<li><strong>Compatibility:<\/strong> Battery voltage, communication protocol, and compatibility list from the inverter manufacturer.<\/li>\n<li><strong>Protections:<\/strong> A suitable circuit breaker and fuse between the battery and the inverter, and proper grounding, as in the article <a href=\"\/en\/inverter-protection-spd-earthing\/\">Protecting the inverter and solar system<\/a>.<\/li>\n<li><strong>Cables:<\/strong> A section that can withstand charging and discharging current, especially in low-voltage batteries that carry high currents.<\/li>\n<li><strong>Installation location:<\/strong> Indoor or shaded, well-ventilated, away from direct sunlight and heat sources.<\/li>\n<li><strong>Electrical panel:<\/strong> Identify the circuits that operate during the outage and disconnect them in a backup panel if necessary.<\/li>\n<li><strong>Requirements:<\/strong> Network-connected systems are subject to the requirements of the competent authorities, so review them before making any modifications.<\/li>\n<\/ul>\n<h2>Common mistakes<\/h2>\n<ul>\n<li>Buying a battery because it is &quot;lithium&quot; without checking its compatibility with the inverter.<\/li>\n<li>Mixing old and new batteries or batteries of different types in the same group.<\/li>\n<li>The battery is enlarged, but the panels are not sufficient to charge it daily.<\/li>\n<li>Install the battery in a hot warehouse or under the sun.<\/li>\n<li>Ignore the fact that the network-connected system only operates during an outage with a backup system designed for that purpose.<\/li>\n<\/ul>\n<p>To compare different types of batteries, read <a href=\"\/en\/solar-batteries-lithium-vs-gel\/\">Solar batteries: Lithium or gel?<\/a>To understand the hybrid system and its features <a href=\"\/en\/hybrid-solar-with-batteries\/\">Hybrid solar system with batteries<\/a>.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"mits-faq\">\n<h3>Can I add a battery directly to an on-grid inverter?<\/h3>\n<p>No, a mains-only inverter does not have a battery port. The solution is a standalone battery inverter on the AC side, or replacing the inverter with a hybrid one.<\/p>\n<h3>Does the system work during a power outage after adding the battery?<\/h3>\n<p>Yes, if the system is designed for that, with an inverter that supports standby mode and a panel that specifies the loads that operate during the outage.<\/p>\n<h3>Do I need additional panels with the battery?<\/h3>\n<p>If your current panels don&#039;t produce enough excess power to charge your battery during the day, then yes. Check the power output versus consumption before buying.<\/p>\n<h3>Which is better: a low voltage or a high voltage battery?<\/h3>\n<p>The choice is determined first by the inverter. High voltage reduces current and cables in large systems, while low voltage is common in homes and small systems.<\/p>\n<\/div>\n<div class=\"mits-cta\">\n<p><strong>Do you want to add batteries to your system?<\/strong> MITS GROUP provides hybrid inverters and batteries, reviews their compatibility with your existing system, and implements the necessary connections and protections.<\/p>\n<p><a href=\"\/en\/contact\/\">Request a price quote<\/a> \u00b7 <a href=\"https:\/\/wa.me\/966575993880\">WhatsApp 0575993880<\/a> \u00b7 <a href=\"\/en\/product_cat\/hybrid-inverters\/\">Hybrid inverters<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Can you add batteries to an existing grid-connected or hybrid solar system? The three methods: a hybrid inverter that accepts batteries, connecting a battery to the AC side, or replacing the inverter, with evaluation steps.<\/p>","protected":false},"author":1,"featured_media":3354,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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