{"id":29654,"date":"2025-09-10T16:10:40","date_gmt":"2025-09-10T08:10:40","guid":{"rendered":"https:\/\/manlybattery.com\/?p=29654"},"modified":"2025-09-10T16:20:18","modified_gmt":"2025-09-10T08:20:18","slug":"leitfaden-zur-grose-der-solarbatterie-laufzeit-des-kwh-wechselrichters","status":"publish","type":"post","link":"https:\/\/manlybattery.com\/de\/solar-battery-size-guide-kwh-inverter-runtime\/","title":{"rendered":"Gr\u00f6\u00dfenleitfaden f\u00fcr Solarbatterien f\u00fcr Privathaushalte: kWh, Wechselrichteranpassung und Laufzeit"},"content":{"rendered":"\n<h1 class=\"wp-block-heading has-text-align-center\">Solar Battery Size Guide For Homes: kWh, Inverter Match &amp; Runtime<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The fastest way to right-size a solar battery is to turn last year\u2019s bills into a clear load profile, define critical loads, and translate those needs into usable kWh with depth of discharge and inverter efficiency. This guide shows how to pick the right solar battery size for a modern home battery system, match power (kW) with an inverter, and estimate runtime\u2014without guesswork. We follow U.S. codes and safety listings (UL 9540, NEC 705\/706, NFPA 855) to keep recommendations trustworthy and field-ready. Use the in-page solar battery size calculator to convert your data into the recommended kWh, inverter kW, and module count, then review questions to ask a <strong><a href=\"https:\/\/manlybattery.com\/\" target=\"_blank\" rel=\"noopener\" title=\"\">solar battery manufacturer<\/a><\/strong> before you buy. <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/manlybattery.com\/12v-lithium-battery\/\"><img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/manlybattery.com\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery.webp\" alt=\"Best solar battery brands in france - manly battery\" class=\"wp-image-28639\" style=\"width:600px\" srcset=\"https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery.webp 800w, https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery-300x300.webp 300w, https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery-80x80.webp 80w, https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery-768x768.webp 768w, https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery-36x36.webp 36w, https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery-180x180.webp 180w, https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/05\/Best-solar-battery-brands-in-france-manly-battery-705x705.webp 705w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How Many kWh Of <strong>Solar Battery<\/strong> Do I Need For My Home?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Start with your 12-month bills, build a simple load profile, and decide if you\u2019re backing up critical loads or the whole house. Translate nightly kWh into a solar battery size with usable capacity (DoD \u00d7 round-trip efficiency). Typical ranges: 10\u201320 kWh for essentials; 40\u201390 kWh for whole-home in tough climates.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Start With Your Load Profile<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pull average daily kWh from your utility portal or bills. Many homes land around 20\u201335 kWh\/day.<\/li>\n\n\n\n<li>Note seasonal swings (A\/C or heat), EV charging, and upcoming electrification projects. This prevents undersizing your home battery.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Critical Vs Full-Home<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Critical loads panel (fridge, lights, modem\/router, well\/sump, medical devices) often averages 0.6\u20131.5 kW in use.<\/li>\n\n\n\n<li>Whole-home backup must also cover HVAC, oven, dryer, or EV load spikes\u2014this drives both kWh and peak demand (kW).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. From Loads To <strong>Solar Battery Size<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Usable kWh \u2248 Nominal kWh \u00d7 depth of discharge \u00d7 round-trip efficiency.<\/li>\n\n\n\n<li>Example: A 15 kWh pack at 90% depth of discharge and 95% efficiency yields 12.8 kWh usable. If your night-time needs are ~12 kWh, that system fits.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. What Self-Consumption Tells You<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>As daily consumption rises, your own-use share from PV increases. In the reference table you provided:\n<ul class=\"wp-block-list\">\n<li>At 5\u201310 kWh\/day, a 2 kW array self-consumes ~30%; a 10 kW array ~9%.<\/li>\n\n\n\n<li>At 31\u201340 kWh\/day, the same arrays self-consume ~82% and 34%.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Takeaway: higher usage or shifting loads to daylight boosts PV value and reduces the size of battery needed overnight.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Inverter Size\/Efficiency Best Matches My <strong>Solar Battery<\/strong> And Peak Demand?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Match the inverter for <strong><a href=\"https:\/\/manlybattery.com\/battery-shop\/\" target=\"_blank\" rel=\"noopener\" title=\"\">solar battery<\/a><\/strong> to your peak demand (kW) and required surge, then check inverter efficiency (typically 95\u201398%) because it changes runtime math. Capacity (kWh) moves energy; the inverter supplies power (kW) at any moment. Confirm listing and installation under UL 9540, NEC 705\/706, and residential siting in NFPA 855 for safety and code compliance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Power (kW) Vs Energy (kWh)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>kWh = how much energy your home battery stores; kW = how much it can deliver at once.<\/li>\n\n\n\n<li>Add up coincident loads (e.g., fridge + lights + well pump + mini-split). That sum guides inverter continuous rating.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Efficiency, Surge, And Headroom<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inverter efficiency (95\u201398%) slightly reduces usable kWh; account for it in runtime.<\/li>\n\n\n\n<li>Check continuous and 10-second surge specs; compressors and pumps can need 2\u20133\u00d7 their running watts.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Codes, Listings, And Placement<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Look for UL 9540 systems (battery + BMS + inverter as a listed pair).<\/li>\n\n\n\n<li>Design per NEC 705\/706 interconnection\/ESS rules and place equipment per NFPA 855 (clearances, garage\/wall rules).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How Long Will A <strong>Solar Battery<\/strong> Run My Critical Loads?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"> Estimate runtime with a simple rule: <strong>Runtime \u2248 usable kWh \u00f7 (average load kW \u00d7 inverter efficiency)<\/strong>. A 13.5 kWh <strong>solar battery<\/strong> supporting a 1.2 kW critical-loads bundle at 0.95 efficiency runs about <strong>11.8 hours<\/strong>. Reality varies with duty cycles, temperature, and DoD limits.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Build Your Critical-Loads List<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>List watts and duty cycle for fridge, modem\/router, LED lighting, medical devices, well\/sump, and key outlets.<\/li>\n\n\n\n<li>Prioritize life-safety first; add comfort items last.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Do The Math (Worked Example)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Usable = 13.5 kWh \u00d7 0.95 (round-trip) \u2248 12.8 kWh.<\/li>\n\n\n\n<li>Load = 1.2 kW \u00d7 0.95 (<strong>inverter efficiency<\/strong>) \u2248 1.14 kW at the battery.<\/li>\n\n\n\n<li><strong>Runtime \u2248 12.8 \u00f7 1.14 \u2248 11.2\u201311.8 hours<\/strong> (allowing for standby losses).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Adjust For Real-World Factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cold\/heat derating, BMS reserve, and inverter idle draw shorten runtime.<\/li>\n\n\n\n<li>Add one modular unit if outages are frequent or life-safety loads are non-negotiable.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Which Chemistry, DoD, And Standards Deliver A Safer, Longer-Lasting Home Battery?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Today\u2019s <strong><a href=\"https:\/\/manlybattery.com\/home-energy-storage\/\" target=\"_blank\" rel=\"noopener\" title=\"\">home battery<\/a><\/strong> systems typically use LFP or NMC lithium battery for solar inverter applications. Favor high usable DoD (\u224880\u2013100%), robust cycle warranties, and a system that\u2019s UL 9540 listed and installed per NFPA 855 and NEC 705\/706. This combination balances lifespan, safety, and total cost of ownership for a residential solar battery.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Chemistry At A Glance<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LFP (LiFePO4):<\/strong> strong thermal stability, long cycle life, slightly lower energy density.<\/li>\n\n\n\n<li><strong>NMC:<\/strong> higher energy density; more common in compact spaces. Either can work if the system is properly listed.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Depth Of Discharge &amp; Usable Capacity<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Many systems advertise 90\u2013100% usable DoD; always read the datasheet for \u201cusable kWh\u201d vs nameplate.<\/li>\n\n\n\n<li>Verify end-of-warranty capacity (e.g., 60\u201380% after X years\/Y cycles) to model lifecycle value.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. What To Ask A Solar Battery Manufacturer<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Request safety listings (UL 9540\/9540A test summary), throughput warranty (MWh), firmware update policy, and service footprint.<\/li>\n\n\n\n<li>If you need a quick starting point, MANLY Battery offers modular LFP packs that pair with popular hybrid inverters\u2014ask for UL documentation before purchase.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How Much Does A <strong>Solar Battery<\/strong> Cost Per kWh In 2025\u2014And What Drives ROI?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"> Installed solar battery cost per kWh commonly ranges from mid-hundreds to low-thousands depending on capacity, labor, and backup hardware. Federal incentives (e.g., the Investment Tax Credit), state rebates, TOU arbitrage, and outage value drive payback. Model cash flows with your bills and use the calculator\u2019s sensitivity toggles to test scenarios.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Price Drivers You Control<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Right-sizing (avoid idle capacity), modular expansion later, and smart load shifting boost returns.<\/li>\n\n\n\n<li>Pair with TOU rates to charge low and discharge high; stack PV overproduction first.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Incentives And Compliance<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Align design with federal\/state programs.<\/li>\n\n\n\n<li>Ensure code-compliant installation (again: UL 9540, NFPA 855, NEC 705\/706) to qualify and insure.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. When A Larger Size Of Battery Pays<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Frequent outages, medical needs, or high evening spreads can justify bigger packs.<\/li>\n\n\n\n<li>If your winter PV is strong, you may downsize storage and rely more on daytime self-use.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Solar Battery Size Calculator<\/strong>: Inputs, Outputs, And How To Use It<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"> A good solar battery size calculator asks for daily kWh, critical loads, target backup hours, peak demand, depth of discharge, and inverter efficiency. It returns recommended solar battery size (kWh), inverter rating (kW), and runtime scenarios. Enter last year\u2019s bills, pick your backup strategy, and export the result as a spec sheet for your installer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Required Inputs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Average daily kWh and seasonal peaks (winter\/summer).<\/li>\n\n\n\n<li>List of critical loads with watts and duty cycle; target outage hours.<\/li>\n\n\n\n<li>Assumptions: DoD (e.g., 90%), inverter efficiency (95\u201398%), and round-trip efficiency.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Outputs You\u2019ll Get<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recommended solar battery size and stack count.<\/li>\n\n\n\n<li>Inverter for solar battery (continuous\/surge).<\/li>\n\n\n\n<li>Modeled runtime by scenario and an editable BOM.<\/li>\n<\/ul>\n\n\n\n<!-- ===== Solar Battery Size Calculator (scoped, SEO\/LLM-friendly) v1.1 ===== -->\n<section id=\"mb-sbc\" data-version=\"1.1\" aria-label=\"Solar Battery Size Calculator\">\n  <style>\n    \/* --- Scoped styles --- *\/\n    #mb-sbc{font:14px\/1.45 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:#111}\n    #mb-sbc *{box-sizing:border-box}\n    #mb-sbc .sbc-card{border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin:0 0 16px;background:#fff}\n    #mb-sbc h2,#mb-sbc h3{margin:0 0 10px;line-height:1.25}\n    #mb-sbc h2{font-size:20px}\n    #mb-sbc h3{font-size:16px;color:#374151}\n    #mb-sbc .sbc-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:12px}\n    #mb-sbc .col-6{grid-column:span 6}\n    #mb-sbc .col-4{grid-column:span 4}\n    #mb-sbc .col-12{grid-column:span 12}\n    #mb-sbc label{display:block;font-weight:600;margin:4px 0}\n    #mb-sbc input,#mb-sbc select{width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:8px}\n    #mb-sbc .sbc-help{font-size:12px;color:#6b7280;margin-top:4px}\n    #mb-sbc .sbc-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}\n    #mb-sbc .sbc-btn{appearance:none;border:1px solid #14b8d7;background:#14b8d7;color:#fff;\n      padding:10px 14px;border-radius:10px;font-weight:700;cursor:pointer}\n    #mb-sbc .sbc-btn.secondary{background:#fff;color:#14b8d7;border-color:#14b8d7}\n    #mb-sbc .sbc-out{border:1px dashed #e5e7eb;border-radius:10px;padding:12px;background:#fafafa}\n    #mb-sbc .sbc-kpi{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:10px 0}\n    #mb-sbc .sbc-kpi .k{background:#14b8d7;color:#fff;border-radius:10px;padding:12px;text-align:center}\n    #mb-sbc .sbc-kpi .k b{display:block;font-size:18px;margin-top:6px}\n    #mb-sbc .sbc-table{width:100%;border-collapse:collapse;margin-top:8px}\n    #mb-sbc .sbc-table th,#mb-sbc .sbc-table td{border:1px solid #e5e7eb;padding:8px;text-align:left}\n    #mb-sbc .sbc-note{font-size:12px;color:#6b7280;margin-top:8px}\n    #mb-sbc .sbc-display{padding:10px 12px;border:1px dashed #cbd5e1;border-radius:8px;background:#f8fafc;font-weight:700}\n    @media (max-width:720px){\n      #mb-sbc .col-6,#mb-sbc .col-4{grid-column:span 12}\n      #mb-sbc .sbc-kpi{grid-template-columns:1fr}\n    }\n  <\/style>\n\n  <div class=\"sbc-card\" role=\"form\" aria-describedby=\"sbc-desc\">\n    <h2>Solar Battery Size Calculator<\/h2>\n    <p id=\"sbc-desc\" class=\"sbc-help\">\n      Estimate <b>solar battery<\/b> size (kWh), inverter match (kW), and runtime. Formulas include depth of discharge and\n      <b>inverter efficiency<\/b>. Verify installations against UL&nbsp;9540 \/ NEC&nbsp;705\/706 \/ NFPA&nbsp;855.\n    <\/p>\n\n    <div class=\"sbc-grid\">\n      <!-- Inputs that drive Estimate -->\n      <div class=\"col-6\">\n        <label for=\"sbc_daily\">Average Daily Usage (kWh\/day)<\/label>\n        <input id=\"sbc_daily\" type=\"number\" step=\"0.1\" min=\"0\" value=\"30\" inputmode=\"decimal\" \/>\n        <div class=\"sbc-help\">Use your 12-month utility average.<\/div>\n      <\/div>\n      <div class=\"col-6\">\n        <label for=\"sbc_nightshare\">Night Share Of Daily Use (%)<\/label>\n        <input id=\"sbc_nightshare\" type=\"number\" step=\"1\" min=\"0\" max=\"100\" value=\"50\" \/>\n        <div class=\"sbc-help\">Percent of daily kWh you need overnight.<\/div>\n      <\/div>\n      <div class=\"col-6\">\n        <label for=\"sbc_hours\">Target Backup Hours (h)<\/label>\n        <input id=\"sbc_hours\" type=\"number\" step=\"1\" min=\"1\" value=\"12\" \/>\n      <\/div>\n      <div class=\"col-6 sbc-row\" style=\"align-self:end\">\n        <button class=\"sbc-btn\" id=\"sbc_estimate\" type=\"button\" aria-controls=\"sbc_load_display\">\n          Estimate Critical Load\n        <\/button>\n        <span class=\"sbc-help\">Click to compute kW from the three fields.<\/span>\n      <\/div>\n\n      <!-- Calculated (read-only) result placed AFTER the three drivers -->\n      <div class=\"col-12\">\n        <label>Average Outage\/Critical Load (kW)<\/label>\n        <div id=\"sbc_load_display\" class=\"sbc-display\" aria-live=\"polite\">\u2014<\/div>\n        <div class=\"sbc-help\">Calculated: (Daily kWh \u00d7 Night %) \u00f7 Backup Hours<\/div>\n      <\/div>\n\n      <!-- Other design inputs -->\n      <div class=\"col-6\">\n        <label for=\"sbc_peak\">Peak Demand (kW)<\/label>\n        <input id=\"sbc_peak\" type=\"number\" step=\"0.1\" min=\"0\" value=\"3.0\" \/>\n        <div class=\"sbc-help\">Largest simultaneous power; drives inverter sizing.<\/div>\n      <\/div>\n      <div class=\"col-6\">\n        <label for=\"sbc_module\">Module Size For Stacking (kWh)<\/label>\n        <input id=\"sbc_module\" type=\"number\" step=\"0.1\" min=\"1\" value=\"5\" \/>\n        <div class=\"sbc-help\">Only for estimating module count.<\/div>\n      <\/div>\n\n      <div class=\"col-4\">\n        <label for=\"sbc_dod\">Depth Of Discharge (DoD, %)<\/label>\n        <input id=\"sbc_dod\" type=\"number\" step=\"1\" min=\"10\" max=\"100\" value=\"90\" \/>\n      <\/div>\n      <div class=\"col-4\">\n        <label for=\"sbc_inv_eff\">Inverter Efficiency (%)<\/label>\n        <input id=\"sbc_inv_eff\" type=\"number\" step=\"1\" min=\"80\" max=\"100\" value=\"95\" \/>\n      <\/div>\n      <div class=\"col-4\">\n        <label for=\"sbc_rte\">Round-Trip Efficiency (%)<\/label>\n        <input id=\"sbc_rte\" type=\"number\" step=\"1\" min=\"80\" max=\"100\" value=\"95\" \/>\n      <\/div>\n\n      <div class=\"col-12 sbc-row\" style=\"margin-top:6px\">\n        <button class=\"sbc-btn\" id=\"sbc_calc\" type=\"button\">Calculate<\/button>\n        <button class=\"sbc-btn secondary\" id=\"sbc_reset\" type=\"button\">Reset<\/button>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"sbc-card\" aria-live=\"polite\">\n    <h3>Results<\/h3>\n    <div class=\"sbc-kpi\" id=\"sbc_kpis\">\n      <div class=\"k\"><span>Recommended Battery Size<\/span><b id=\"k_batt\">\u2014<\/b><span>Nominal kWh<\/span><\/div>\n      <div class=\"k\"><span>Suggested Inverter<\/span><b id=\"k_inv\">\u2014<\/b><span>kW Continuous<\/span><\/div>\n      <div class=\"k\"><span>Estimated Runtime<\/span><b id=\"k_run\">\u2014<\/b><span>Hours @ Your Load<\/span><\/div>\n    <\/div>\n    <div class=\"sbc-out\">\n      <table class=\"sbc-table\" id=\"sbc_table\">\n        <thead><tr><th>Parameter<\/th><th>Value<\/th><th>Notes<\/th><\/tr><\/thead>\n        <tbody><\/tbody>\n      <\/table>\n      <div class=\"sbc-note\">\n        Formulas include DoD and efficiencies with +10% headroom. Confirm UL&nbsp;9540 listing; install per NEC&nbsp;705\/706 &amp; NFPA&nbsp;855.\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- JSON-LD: WebApplication for SEO\/LLM -->\n  <script type=\"application\/ld+json\">\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"WebApplication\",\n    \"name\": \"Solar Battery Size Calculator\",\n    \"applicationCategory\": \"Calculator\",\n    \"operatingSystem\": \"All\",\n    \"about\": \"Solar battery sizing, inverter matching, and runtime estimation.\",\n    \"offers\": {\"@type\": \"Offer\",\"price\":\"0\",\"priceCurrency\":\"USD\"}\n  }\n  <\/script>\n\n  <script>\n    (function(){\n      const q = (s)=>document.querySelector('#mb-sbc '+s);\n      const fmt = (n,u='')=>isFinite(n)?(Math.round(n*100)\/100).toLocaleString()+(u?(' '+u):''):'\u2014';\n      const state = { loadKW: null };\n\n      function estimateLoad(){\n        const daily = parseFloat(q('#sbc_daily').value)||0;\n        const night = (parseFloat(q('#sbc_nightshare').value)||0)\/100;\n        const hrs   = Math.max(parseFloat(q('#sbc_hours').value)||0,1);\n        const est   = (daily*night)\/hrs; \/\/ kW\n        state.loadKW = Math.max(Math.round(est*100)\/100,0);\n        q('#sbc_load_display').textContent = isFinite(state.loadKW)? fmt(state.loadKW,'kW')+' (estimated)' : '\u2014';\n      }\n\n      function calc(){\n        \/\/ Ensure we have an estimate even if user skipped the button\n        if(state.loadKW===null) estimateLoad();\n\n        const daily   = parseFloat(q('#sbc_daily').value)||0;\n        const hrs     = Math.max(parseFloat(q('#sbc_hours').value)||0,1);\n        const peakKW  = Math.max(parseFloat(q('#sbc_peak').value)||0,0);\n        const moduleK = Math.max(parseFloat(q('#sbc_module').value)||0.1,0.1);\n\n        const dod     = Math.min(Math.max((parseFloat(q('#sbc_dod').value)||0)\/100,0.1),1);\n        const invEff  = Math.min(Math.max((parseFloat(q('#sbc_inv_eff').value)||0)\/100,0.5),1);\n        const rte     = Math.min(Math.max((parseFloat(q('#sbc_rte').value)||0)\/100,0.5),1);\n\n        const loadKW  = Math.max(state.loadKW||0,0);\n\n        \/\/ Required nominal kWh (+10% headroom)\n        const effTotal = dod * invEff * rte;\n        const requiredNominal = effTotal>0 ? (loadKW * hrs) \/ effTotal * 1.10 : NaN;\n\n        \/\/ Inverter sizing (continuous) with headroom\n        const contKW = Math.max(peakKW, loadKW*1.2);\n\n        \/\/ Usable energy from recommended pack\n        const usableKWh = requiredNominal * dod * rte;\n\n        \/\/ Runtime at load\n        const runtimeH = invEff>0 ? (usableKWh \/ (loadKW * invEff)) : NaN;\n\n        \/\/ Modules\n        const modules = moduleK>0 ? Math.ceil(requiredNominal \/ moduleK) : NaN;\n\n        \/\/ KPIs\n        q('#k_batt').textContent = fmt(requiredNominal,'kWh');\n        q('#k_inv').textContent  = fmt(contKW,'kW');\n        q('#k_run').textContent  = fmt(runtimeH,'h');\n\n        \/\/ Detail table\n        const rows = [\n          ['Average Daily Usage', fmt(daily,'kWh\/day'), 'From utility bills'],\n          ['Average Outage\/Critical Load', fmt(loadKW,'kW'), 'Estimated from inputs'],\n          ['Target Backup Hours', fmt(hrs,'h'), 'Goal'],\n          ['Peak Demand (kW)', fmt(peakKW,'kW'), 'Drives inverter sizing'],\n          ['Depth of Discharge', (dod*100).toFixed(0)+' %', 'DoD'],\n          ['Inverter Efficiency', (invEff*100).toFixed(0)+' %', 'AC conversion'],\n          ['Round-Trip Efficiency', (rte*100).toFixed(0)+' %', 'Charge\/discharge'],\n          ['Recommended Battery Size', fmt(requiredNominal,'kWh (nominal)'), '+10% headroom'],\n          ['Estimated Modules', isFinite(modules)? modules+' \u00d7 '+fmt(moduleK,'kWh') : '\u2014', 'Stacking estimate'],\n          ['Suggested Inverter (Continuous)', fmt(contKW,'kW'), 'Allow 2\u20133\u00d7 surge for motors'],\n          ['Modeled Runtime @ Load', fmt(runtimeH,'hours'), 'From recommended pack']\n        ];\n        const tbody = q('#sbc_table tbody');\n        tbody.innerHTML = rows.map(r=>`<tr><td>${r[0]}<\/td><td>${r[1]}<\/td><td>${r[2]}<\/td><\/tr>`).join('');\n      }\n\n      function reset(){\n        const defaults = {sbc_daily:30,sbc_nightshare:50,sbc_hours:12,sbc_peak:3.0,sbc_module:5,sbc_dod:90,sbc_inv_eff:95,sbc_rte:95};\n        Object.keys(defaults).forEach(id=>{ q('#'+id).value = defaults[id]; });\n        state.loadKW = null;\n        q('#sbc_load_display').textContent = '\u2014';\n        ['#k_batt','#k_inv','#k_run'].forEach(id=>{ q(id).textContent='\u2014'; });\n        q('#sbc_table tbody').innerHTML='';\n      }\n\n      \/\/ Bind (scoped)\n      q('#sbc_estimate').addEventListener('click', estimateLoad);\n      q('#sbc_calc').addEventListener('click', calc);\n      q('#sbc_reset').addEventListener('click', reset);\n    })();\n  <\/script>\n<\/section>\n<!-- ===== End: Solar Battery Size Calculator ===== -->\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Right-sizing starts with facts: your load profile, the critical loads you\u2019ll back up, your peak demand, and realistic DoD\/efficiency assumptions. From there, the size of battery (kWh) and the inverter rating (kW) fall out cleanly, letting you model runtime, incentives, and solar battery cost per kWh with confidence. Keep designs code-compliant (UL 9540, NEC 705\/706, NFPA 855), and revisit the calculator as seasons or appliances change. When you\u2019re ready, export your spec for an installer and ask any solar battery manufacturer for listings, warranties, and integration details.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">How Do I Match My Battery Size To My Inverter?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Size energy and power separately: choose solar battery size (kWh) from your load profile and critical loads\u2014usable kWh = nominal \u00d7 depth of discharge \u00d7 round-trip efficiency\u2014then pick the inverter for solar battery whose continuous kW meets your peak demand, whose surge handles motors (2\u20133\u00d7), and whose inverter efficiency (typically 95\u201398%) aligns with your runtime target. Confirm UL 9540 \/ NEC 705\/706 \/ NFPA 855. Use the in-page solar battery size calculator to turn bills into kWh and kW specs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is A 5kW Or 10kW Solar Battery Better?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Neither is \u201cbetter\u201d in a vacuum\u20145 kW and 10 kW usually describe inverter output, not the size of battery. Choose based on what you run at once (kW) and how long you must run it (kWh). For essentials, many homes pair a 10\u201320 kWh solar battery with a 5\u201310 kW inverter; whole-home or high HVAC loads may justify the 10 kW class. Match to your peak demand and calculated solar battery size.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is A 200W Solar Panel Enough For A 100Ah Battery?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Often not for a daily full recharge. A 200 W panel makes roughly 0.8\u20131.0 kWh on a good 4\u20135 sun-hour day; a 12 V 100 Ah home battery stores about 1.2\u20131.3 kWh (chemistry-dependent), and usable energy drops with depth of discharge. Expect one to two sunny days to refill from deep discharge; plan 300\u2013400 W+ if you need daily recovery, or reduce overnight loads with a realistic load profile.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Learn More About Battery<\/h2>\n\n\n\n<div id=\"related-posts-3052\" class=\"related-posts-container\"  data-category=\"Battery Knowledge\" data-date=\"2025-01-01,2025-10-30\" data-per_page=\"4\"><div class=\"related-posts-wrapper\"><div class=\"related-posts-grid\"><div class=\"related-post\"><a href=\"https:\/\/manlybattery.com\/de\/how-to-charge-deep-cycle-batteries\/\"><img decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/07\/12v-48v-lithium-battery-charger-300x200.webp\" class=\"related-post-thumb wp-post-image\" alt=\"12v 48v Lithium Battery Charger\" 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https:\/\/manlybattery-static-cdn.cimen.club\/manlybattery\/wp-content\/uploads\/2025\/10\/What-type-of-battery-is-best-for-rv.webp 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><h3 style=\"font-size:14px !important\">2025 What Type Of Battery Is Best For RV<\/h3><\/a><\/div><\/div><div class=\"related-posts-pagination\" data-current=\"1\"><a href=\"#\" class=\"active\" data-page=\"1\">1<\/a><a href=\"#\" class=\"\" data-page=\"2\">2<\/a><span class=\"pagination-dots\">...<\/span><a href=\"#\" data-page=\"41\">41<\/a><\/div><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Solar Battery Size Guide For Homes: kWh, Inverter Match &amp; Runtime The fastest way to right-size a solar battery is [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":28639,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"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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