{"id":9592,"date":"2025-10-02T14:20:37","date_gmt":"2025-10-02T19:20:37","guid":{"rendered":"https:\/\/www.miamiherald.com\/explore\/?p=9592"},"modified":"2025-11-13T02:47:53","modified_gmt":"2025-11-13T07:47:53","slug":"generator-size-guide","status":"publish","type":"post","link":"https:\/\/www.miamiherald.com\/explore\/generator-size-guide\/","title":{"rendered":"What Size Generator Do You Need? How to Choose"},"content":{"rendered":" <p class=\"wp-block-paragraph\">When a storm knocks out your neighborhood\u2019s electricity or you\u2019re out camping far from the grid, one question becomes very real: <em>Is my generator strong enough to handle what I need?<\/em> Picking the right generator size isn\u2019t just a shopping decision; it\u2019s about comfort, safety, and peace of mind.<\/p> <p class=\"wp-block-paragraph\">But with models ranging from fewer than <a href=\"https:\/\/www.consumerreports.org\/home-garden\/generators\/how-to-choose-the-right-size-generator-a4942266454\/\">2,000 to 20,000<\/a> watts, making the correct choice can feel like a shot in the dark. The answer depends on the devices you plan to power, how long you want to run them, and whether you need a temporary fix or a whole-home solution.<\/p> <p class=\"custom_key wp-block-paragraph\"><strong>Key Takeaways<\/strong><\/p> <ul class=\"wp-block-list custom_underline\"> <li><strong>Start with Watts:<\/strong> Know both running watts and starting watts before sizing a generator. Starting surges are often the hidden deal-breaker.<\/li> <li><strong>Match the Use Case:<\/strong> Small portables (1,000\u20132,000W) suit camping trips; mid-range (5,000\u20137,500W) covers essentials; 15,000W+ powers a whole home.<\/li> <li><strong>Installation Matters:<\/strong> Standby units need transfer switch installation, often by a licensed electrician, and possibly a concrete pad for stability.<\/li> <li><strong>Avoid Common Mistakes:<\/strong> Don\u2019t undersize by ignoring surges or oversize so much that you waste money and fuel. Safety and balance matter.<\/li> <li><strong>Plan for Fuel and Safety:<\/strong> Choose a reliable fuel source and never run a generator indoors\u2014carbon monoxide is deadly.<\/li> <\/ul> <h2 class=\"wp-block-heading\" id=\"h-why-generator-size-matters\"><strong>Why Generator Size Matters<\/strong><\/h2> <p class=\"wp-block-paragraph\">Undersize a generator, and you\u2019ll constantly trip breakers or fail to start critical appliances. Oversize it, and you\u2019ll spend thousands more than you needed to, plus burn extra fuel along the way. Finding the sweet spot means balancing cost, convenience, and real-world power demands.<\/p> <p class=\"wp-block-paragraph\">Think of it like buying a car. You don\u2019t need a pickup truck if all you do is drive around town, but a compact car won\u2019t tow a boat. The same logic applies to generators: <strong>know your load before you buy.<\/strong><\/p> <h2 class=\"wp-block-heading\" id=\"h-running-watts-vs-starting-watts\"><strong>Running Watts vs. Starting Watts<\/strong><\/h2> <p class=\"wp-block-paragraph\">Before you dive into numbers, you need to understand two tricky but important terms:<\/p> <ul class=\"wp-block-list\"> <li><strong>Running Watts:<\/strong> The continuous electricity needed to keep a device working.<\/li> <li><strong>Starting Watts:<\/strong> The short burst of power needed to turn on a motor-driven appliance (think refrigerators, sump pumps, or air conditioners).<\/li> <\/ul> <p class=\"wp-block-paragraph\">That refrigerator in your kitchen may only <em>run<\/em> at 700 watts, but it can spike to 2,200 watts the moment the compressor kicks in. Ignore that, and your generator may stall or shut down.<\/p> <p class=\"wp-block-paragraph\"><strong>Tip:<\/strong> Always size for the highest starting wattage in your setup, then add a cushion.<\/p> <h2 class=\"wp-block-heading\" id=\"h-typical-wattage-needs-by-appliance\"><strong>Typical Wattage Needs by Appliance<\/strong><\/h2> <p class=\"wp-block-paragraph\">Here are some average wattage ranges to help with planning:<\/p> <ul class=\"wp-block-list\"> <li>Refrigerator: 700 running \/ 2,200 starting<\/li> <li>Sump pump: 1,000 running \/ 2,000 starting<\/li> <li>Window A\/C unit: 1,200 running \/ 3,600 starting<\/li> <li>Electric water heater: 4,000 running<\/li> <li>Lights: 60\u2013300 each, depending on bulbs<\/li> <li>Router\/Wi-Fi: 20\u201350 running<\/li> <li>Phone charger: 10 running<\/li> <\/ul> <p class=\"wp-block-paragraph\">For a typical home, critical circuits (fridge, lights, sump pump, Wi-Fi) often land in the <strong>5,000 to 7,500-watt<\/strong> range. Add HVAC, laundry, or water heating, and you\u2019ll quickly need <strong>15,000\u201320,000 watts<\/strong> or more.<\/p> <h2 class=\"wp-block-heading\" id=\"h-small-vs-large-breaking-down-generator-types\"><strong>Small vs. Large: Breaking Down Generator Types<\/strong><\/h2> <figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-info.png\" alt=\"choosing the right generator size\" class=\"wp-image-9596\" srcset=\"https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-info.png 1024w, https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-info-300x300.png 300w, https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-info-150x150.png 150w, https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-info-768x768.png 768w, https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-info-280x280.png 280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure> <h3 class=\"wp-block-heading\" id=\"h-portable-generators\"><strong>Portable Generators<\/strong><\/h3> <p class=\"wp-block-paragraph\">These are the jack-of-all-trades machines, often on wheels, that can power a camping trip or a few rooms during a power outage. Output ranges from 2,000 to 7,500 watts. They\u2019re cheaper, but you\u2019ll have to refuel them regularly and never, ever run a generator indoors due to carbon monoxide risks.<\/p> <p class=\"wp-block-paragraph\"><strong>Best For:<\/strong> Camping trips, tailgates, or running just the essentials at home.<\/p> <h3 class=\"wp-block-heading\" id=\"h-standby-generators\"><strong>Standby Generators<\/strong><\/h3> <p class=\"wp-block-paragraph\">Home standby generators sit outside like an A\/C unit, usually fueled by natural gas or propane. They turn on automatically during a power outage and can run indefinitely as long as fuel flows. Sizes start around 7,500 watts and go well beyond 20,000 watts.<\/p> <p class=\"wp-block-paragraph\"><strong>Best For:<\/strong> Households in areas with frequent or long outages, or anyone who wants seamless backup power.<\/p> <h2 class=\"wp-block-heading\" id=\"h-sizing-a-generator-for-different-situations\"><strong>Sizing a Generator for Different Situations<\/strong><\/h2> <p class=\"wp-block-paragraph\">Let\u2019s make this practical.<\/p> <ul class=\"wp-block-list\"> <li><strong>Camping Trip (1,000\u20132,000 watts):<\/strong> Enough to power a few lights, charge devices, and maybe run a small fan. A compact portable generator does the job.<\/li> <li><strong>Essentials Only at Home (5,000\u20137,500 watts):<\/strong> Refrigerator, sump pump, router, lights. This is a common \u201cright-size generator\u201d for budget-conscious homeowners.<\/li> <li><strong>Typical Home with More Appliances (10,000\u201315,000 watts):<\/strong> Add a water heater, some outlets, maybe a window A\/C. You\u2019ll want a large portable or small standby unit.<\/li> <li><strong>Whole Home (15,000\u201325,000+ watts):<\/strong> Air conditioning, water heating, laundry, and all outlets. Only whole-home standby generators can comfortably handle this.<\/li> <\/ul> <h2 class=\"wp-block-heading\" id=\"h-installation-and-safety-considerations\"><strong>Installation and Safety Considerations<\/strong><\/h2> <p class=\"wp-block-paragraph\">A generator isn\u2019t useful if it\u2019s unsafe or installed incorrectly. Here\u2019s what you need to factor in:<\/p> <ul class=\"wp-block-list\"> <li><strong>Transfer Switch:<\/strong> For any home use, a transfer switch installation is a must. It prevents electricity from backfeeding into the grid, protecting utility workers and your home.<\/li> <li><strong>Licensed Electrician:<\/strong> Don\u2019t DIY a standby setup. An electrician ensures your system is code-compliant and properly sized.<\/li> <li><strong>Fuel Source:<\/strong> Portable units often run on gasoline. Larger systems may rely on diesel, propane, or natural gas. Each has trade-offs in cost, storage, and convenience.<\/li> <li><strong>Concrete Pad:<\/strong> Many home standby generators need a solid base for stability and longevity.<\/li> <\/ul> <h2 class=\"wp-block-heading\" id=\"h-real-world-example-of-what-size-generator-you-need\"><strong>Real-World Example of What Size Generator You Need<\/strong><\/h2> <p class=\"wp-block-paragraph\">Imagine you want to cover a 2,000-square-foot house:<\/p> <ul class=\"wp-block-list\"> <li>Refrigerator: 700\/2,200 watts<\/li> <li>Sump pump: 1,000\/2,000 watts<\/li> <li>Furnace fan: 800\/2,350 watts<\/li> <li>Lights + router: 500 watts<\/li> <li>Window A\/C: 1,200\/3,600 watts<\/li> <\/ul> <p class=\"wp-block-paragraph\">Running total: 4,200 watts<br>Highest starting surge: 3,600 watts<br>Add cushion: ~2,000 watts<\/p> <p class=\"wp-block-paragraph\"><strong>Recommended Size:<\/strong> 10,000 watts. Enough to run all critical loads at once without stressing the system.<\/p> <h2 class=\"wp-block-heading\" id=\"h-common-mistakes-people-make-with-their-generator\"><strong>Common Mistakes People Make With Their Generator<\/strong><\/h2> <ul class=\"wp-block-list\"> <li><strong>Forgetting Starting Watts:<\/strong> This is the #1 reason for tripping a generator.<\/li> <li><strong>Oversizing by Too Much:<\/strong> Buying a 22,000-watt monster when you only need 5,000 watts means wasted money and fuel.<\/li> <li><strong>Running Indoors:<\/strong> Portable generators emit deadly carbon monoxide. Always place them outdoors, away from windows.<\/li> <li><strong>Ignoring Maintenance:<\/strong> Even the best generator won\u2019t start if you don\u2019t change oil, filters, and test-run it regularly.<\/li> <\/ul> <h2 class=\"wp-block-heading\" id=\"h-the-bottom-line\"><strong>The Bottom Line<\/strong><\/h2> <p class=\"wp-block-paragraph\">The \u201cright\u201d generator size depends on how much of your life you want to keep running during a power outage. For a few appliances, a 5,000-watt portable generator may suffice. For an entire home, especially if you want heating, cooling, and water, you\u2019ll need a standby unit in the 15,000\u201320,000+ watt range.<\/p> <p class=\"wp-block-paragraph\">Don\u2019t guess\u2014make a list of your essential appliances, check their wattages, and consult a licensed electrician before buying. A properly sized generator won\u2019t just save you money\u2014it\u2019ll ensure safety and reliability when you need it most.<\/p> <h2 class=\"wp-block-heading\" id=\"h-faqs\"><strong>FAQs<\/strong><\/h2> <div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1759211402369\"><strong class=\"schema-faq-question\"><strong>How do I calculate what size generator I need?<\/strong><\/strong> <p class=\"schema-faq-answer\">Add up the running watts of the appliances you want to power, then add the highest starting watt requirement. Add a cushion of at least 10\u201320% for safety.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1759211408132\"><strong class=\"schema-faq-question\"><strong>What will a 5000-watt generator run?<\/strong><\/strong> <p class=\"schema-faq-answer\">A 5,000-watt portable <a href=\"https:\/\/www.miamiherald.com\/explore\/how-generators-work\/\">generator can usually run<\/a> a refrigerator, sump pump, router, and lights together. It\u2019s a solid size for covering basic home essentials.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1759211413040\"><strong class=\"schema-faq-question\"><strong>How many appliances will a 2000-watt generator run?<\/strong><\/strong> <p class=\"schema-faq-answer\">It depends on the devices. A 2,000-watt unit can handle a laptop, router, a few lights, and maybe a microwave one at a time\u2014but not large appliances.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1759211418163\"><strong class=\"schema-faq-question\"><strong>Is 7 kW enough to run a house?<\/strong><\/strong> <p class=\"schema-faq-answer\">Seven kilowatts (7,000 watts) is enough for small homes or powering essentials in a typical home, but it won\u2019t cover all systems like HVAC and water heating.<strong><br\/><\/strong><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1759211423136\"><strong class=\"schema-faq-question\"><strong>What happens if I buy the wrong size generator?<\/strong><\/strong> <p class=\"schema-faq-answer\">If it\u2019s too small, your generator may stall, trip, or fail to start appliances. If it\u2019s too large, you\u2019ll spend more than needed on purchase, fuel, and maintenance.<\/p> <\/div> <\/div> ","protected":false},"excerpt":{"rendered":"<p>When a storm knocks out your neighborhood\u2019s electricity or you\u2019re out camping far from the grid, one question becomes very real: Is my generator strong enough to handle what I need? Picking the right generator size isn\u2019t just a shopping decision; it\u2019s about comfort, safety, and peace of mind. But with models ranging from fewer [&hellip;]<\/p> ","protected":false},"author":12,"featured_media":9594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-9592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"acf":{"external_author":[9624],"external_editor":"","not_show_feature_image":true,"hide_toc":false},"featured_image_src":"https:\/\/www.miamiherald.com\/explore\/wp-content\/uploads\/sites\/14\/2025\/09\/What-Size-Generator-Do-You-Need-feature-img-768x427.png","author_info":{"display_name":"","author_link":"https:\/\/www.miamiherald.com\/explore\/author\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Size Generator Do You Need? 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