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What Size Generator Do I Need To Run A 2000 Sq. Ft. House?

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Power outages can be incredibly disruptive, leaving homeowners without electricity and appliances suddenly unusable. When the lights go out, most people aren't prepared. Having a backup generator provides a reliable solution for emergency power needs, keeping your essentials running smoothly.

What Size Generator Do I Need To Run A 2000 Sq. Ft. House?

Determining the right size generator for your home's electricity requirements is crucial, but can also be tricky to calculate. If you undersize your generator, it won't be able to meet your household's electrical demands. On the other hand, oversizing leads to unnecessary expenses without providing any extra benefit. Properly sizing your generator is the key to getting optimal performance and value.

This guide will walk you through the key factors in identifying the appropriate generator size for a typical 2000 square foot house. Read on to learn how to determine your home's electrical requirements and select the ideal generator to meet those needs during an outage. With the right information and preparation, you can make sure your generator provides the backup power you need without wasting money on excess capacity.

What Size Generator Do You Need To Run A 2000 Sq. Ft. House?

Typically, an average home with a 2,000-square-foot home may require 20kWh to 30kWh of power per day. Determining the right generator size starts with understanding your power needs in watts. You'll need to take an inventory of the essential appliances and devices you want to run during an outage. Make a list of each one and look up their rated wattages - this information should be on a label or in the user manual.

Some key points on wattage:

  • Focus on the continuous or running watt rating, not the higher start-up surge wattage.

  • Consider both 120V standard appliances like lights and kitchen items as well as 240V large appliances like an electric oven or HVAC system.

  • LED light bulbs use very few watts - an average LED light bulb is only 8-12 watts.

Once you've totaled up the running wattage needed, use this formula to calculate the generator size:

Generator Size = Total Watts x Hours of Use Per Day

So for example, if you need 3000 watts continuously and want to run up to 5 hours per day in an outage, you would need a 3000 x 5 = 15,000 watt or 15 kW generator.

Add up the critical loads you want to power simultaneously to determine your total wattage needs. Remember to focus on the continuous running watts, rather than surge watts for sizing purposes. Then use the simple formula above to arrive at the properly sized generator for your home or business.

Why Properly Size the Generator is Important

When it comes to backup generators, getting the size right for your needs is crucial. On one hand, purchasing an oversized generator that produces more power than you need will end up costing you extra money upfront and over time. The extra capacity will sit idle most of the time.

On the other hand, undersizing your generator by getting one that doesn't produce enough power can lead to frustration when you experience an outage. If your generator can't handle the load from your home's essential appliances and devices, it defeats the purpose of having backup power.

The ideal approach is to size up your generator slightly to provide some flexibility in your electricity usage. Getting a model rated for 2200-2500 watts will give you some buffer room over the estimated 2000 watt demand. This allows you to add an appliance or two later on if needed.

Generator for Power outages

That said, there's also a case for sizing your generator down if you want to save money and are diligent about tracking your power consumption. If you know you will only run specific appliances sparingly during an outage, a smaller and more affordable generator may suffice. Just be sure to do the calculations properly.

Overall, take time to determine your true needs and size accordingly. It comes down to your budget and willingness to spend more upfront for extra capability or get by with less power at a lower cost. The goal is to get the optimal generator that fulfills your requirements without overspending.

Sizing Factors

When determining the appropriate generator size for your home, there are a few key factors to consider:

  • Generator Type - The fuel source for your generator will impact its power output and capacity. Gas generators tend to be more powerful but require fuel, while solar generators are clean and quiet but rely on sunny weather.

  • Total Watts for Appliances - Add up the starting and running wattage requirements for all essential appliances and devices you want to power. This will determine the minimum watts your generator needs to produce. Always leave buffer room in your calculations.

  • Desired Power Output - Consider your needs during a power outage. Do you just need basic lighting and device charging? Or do you want to run heating/AC, well pump, appliances, etc? Your desired power output will determine if you need a smaller portable or larger standby whole-house generator.

Getting an accurate total load wattage number and knowing your must-have appliances will ensure you size your generator correctly. Oversizing provides extra capacity while undersizing risks unmet demand during an outage.

Growatt Solar Generator Recommendation

Growatt offers a range of high quality, efficient solar generators that are perfect for powering a 2,000 sq ft house. Their products utilize advanced lithium batteries to store solar energy efficiently and provide steady, reliable power when grid electricity is unavailable.

The Growatt INFINITY 2000 is an excellent choice for a 2,000 sq ft home. With a 2048Wh lithium battery capacity, it can power most essential appliances and electronics for extended outages.

A key advantage of Growatt products is the ability to connect extra solar panels to increase charging power. This modular, expandable design means you can scale up the system over time as your needs change. With fast charging speeds, quiet operation and pure sine wave power, Growatt's solar generators are ideal for whole home backup.

What to Consider When Choosing Your Generator for 2000 Sq. Ft. House?

When selecting a generator, there are a few key factors to consider:

Noise Level

  • Pay attention to the decibel rating (dB). Lower dB is quieter. Under 65 dB is ideal for home use.

  • Consider where you'll operate the generator. If close to living spaces, prioritize quieter models.


  • Choose an engine with proven reliability and durability. This ensures longer lifespan.

  • Metal enclosures and frames are more durable than plastic.

  • Look for weather-resistant construction if using outdoors.

Power Capacity

  • Match the rated wattage to your calculated needs.

  • Allow extra buffer for safety (10-20% more capacity).


  • If you need to move the generator around, don't compromise too much on weight and size.

  • Wheeled models are ideal for maneuverability.

  • Handles make lifting and moving easier.

  • Compact, all-in-one designs maximize portability.

Cost vs Solar Panels

Solar panels can provide tremendous long-term savings compared to fuel-powered generators. Though the upfront cost of solar panels is higher, over the lifetime of the system the fuel savings typically far outweigh the initial investment.

With a fuel generator, you need to continually purchase gasoline, propane, or diesel to run the generator whenever there is a power outage. The fuel costs add up dramatically over time. In contrast, with a solar generator the "fuel" is free once you make the initial purchase. The sun's energy is harnessed by the solar panels to charge the batteries that power the generator.

Some key advantages of solar generators:

  • No recurring fuel costs - sunlight is free. This saves thousands of dollars over the generator's lifetime.
  • Lower maintenance since there's no engine or mechanical parts.
  • Solar power is clean and quiet. No noise or fumes.
  • Can be expanded by adding more solar panels to increase capacity.
  • Weather-resistant and safe to run outdoors.
  • Provide power during daylight hours without needing battery reserves.

Even though solar generators have a larger upfront cost, over a 5-10 year period they can provide substantial cost savings compared to conventional fuel-powered generators. The break-even point depends on factors like generator usage and fuel prices, but generally solar becomes cheaper in the long run. And you get the added benefits of clean, quiet operation.

Safety for Electronics

One of the most important considerations when purchasing a generator is the safety it provides for your sensitive electronics. An unstable or "dirty" power source can damage televisions, computers, and other fragile devices.

The Growatt portable power stations provide stable, clean electricity that is safe for electronics. They output pure sine wave AC power like you get from the wall outlet, protecting your valued equipment from surges or fluctuations.

backup generators

Because the Growatt generators have integrated batteries, the voltage and frequency stay constant. This gives you peace of mind to confidently plug in and charge your phones, laptops, medical devices, and more during an outage. There is no need to worry about power spikes harming your electronics when utilizing a Growatt power station.

Some cheaper generators produce "dirty power" with voltage spikes and frequency fluctuations that can fry electronics. The clean reliable power from Growatt generators provide voltage regulation and surge protection, keeping your sensitive devices safe.

With a properly sized Growatt generator, you can safely power and charge all your essential electronics to stay connected even during extended power failures. Growatt's advanced lithium-ion batteries deliver steady, stable wattage for all your devices.

Sizing Guidance

When determining the right size generator, keep these recommendations in mind for common appliances:

  • Refrigerator - Look at the startup wattage, not just running watts. Allow 3x the watts for startup surge. A 20 cubic foot fridge needs around 2000 startup watts.

  • Furnace - An electric furnace draws around 5000 watts on startup. Make sure your generator can handle the surge.

  • Water heater - Electric water heaters need 4000-5000 watts for the heating elements. Consider a propane on-demand heater instead.

  • Air conditioner - A 12,000 BTU AC uses around 1500 watts. Make sure your generator can run it and other loads simultaneously.

  • Microwave - Allow 1200-1500 watts for a typical 1000+ watt microwave due to startup surge.

  • Electric stove - Each burner may use 1500+ watts. The oven can draw 2000-5000 watts depending on usage.

  • Clothes dryer - Electric dryers need 4000-5000 watts to run safely. Gas dryers need much less.

  • Washing machine - Allow 1500-2000 watts for washers larger than 3 cubic feet. Smaller ones may only need 500-1200 watts.

  • Lights and fans - LED bulbs draw little energy. Allow 100 watts per room for lights and fans.

Some rules of thumb:

  • Allow 3000-5000 watts for a medium sized home. Add 500-1000 watts per each larger room or appliance.

  • Plan for 2-3x the running watt rating for motor-driven appliances to account for startup surges.

  • Prioritize essential loads like fridge, heating, medical devices. Cut down on non-essentials.

  • Add up the watts needed for everything running at once. Choose a generator sized for simultaneous usage.


When determining the right size generator for your needs, it's important to take the time to calculate your household's wattage requirements. Consider all the appliances and devices you need to power during an outage to get an accurate estimate. Keep in mind that starting wattage and running wattage can vary, so be sure to factor that into your calculations.

Getting the properly sized generator is crucial - too small and your power needs won't be met, too large and you'll overspend. Work with an electrician or qualified generator expert if you need help determining the ideal capacity. They can evaluate your home's electrical system and provide professional recommendations.

Growatt offers a range of portable, efficient and quiet generators with different wattage capacities. From the compact VITA 550 to the robust Solar Generator INFINITY 2000, they have reliable solar-powered models to match various energy demands. Visit their website to compare specifications and find the right size generator for your home. With the proper planning and advice, you can have confidence your backup power solution will perform when you need it most.

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