What Size Generator Will Run a House? A Friendly Guide to 10 for Your Consideration
Choosing the right generator to power your house can feel overwhelming. With so many options available, it’s important to understand what size generator suits your specific needs. Whether you’re looking to keep a few essential appliances running or power your entire home, the right generator can make all the difference. Let’s dive in and explore generator sizes, their uses, and some great options to consider.
How to Determine the Right Size for Your Home
Generators come in various sizes, measured in kilowatts (kW), which represent the amount of electricity they can produce. The size you need depends on how much power you want to generate. Here are a few steps to figure it out:
- Identify Your Needs: Do you want to power just essential appliances (like the fridge and lights) or everything, including HVAC systems and water heaters?
- Calculate Your Power Requirements: Add up the wattage of all the appliances and devices you plan to use simultaneously.
- Include a Buffer: Choose a generator with at least 10-20% more capacity than your total wattage to handle startup surges from appliances like refrigerators or air conditioners.
To give you a better idea, here’s a handy chart:
Generator Size Recommendations Based on Household Usage
| Household Usage Intent | Recommended Generator Size (kW) |
|---|---|
| Essential Appliances (Fridge, Lights, Fans) | 3-5 kW |
| Additional Devices (Microwaves, TVs, Computers) | 5-7 kW |
| Full Home Power with HVAC | 20-30 kW |
| Off-grid Living with Renewable Energy Backup | 30+ kW with Solar Integration |
| Small to Medium Homes (Moderate Appliances) | 10-15 kW |
| Large Homes (All Systems and Appliances) | 30-50 kW |
| Emergency Backup for High-Power Devices | 15-20 kW |
Seven Great Generators to Consider
Choosing the right generator can be the key to maintaining comfort and functionality during power outages, outdoor events, or emergencies. To simplify your decision, here are seven excellent generators, categorized by their power output and intended uses, along with expanded details to guide your choice.
1. Honda EU7000iS (7 kW) (Partial whole house)
Best For: Medium-sized homes needing backup for appliances and basic devices.
Why It Stands Out:
The Honda EU7000iS is famous for its dependable performance, quiet operation, and advanced inverter technology. Its ability to produce clean, stable power makes it ideal for sensitive electronics like laptops, medical devices, and smartphones. With a 5.1-gallon fuel tank, it provides an impressive runtime of up to 18 hours at 25% load.
Key Features:
- Inverter technology for clean and safe energy.
- Quiet operation at 52–58 dB.
- Electric start for convenience.
2. Generac Guardian Series (22 kW)
Best For: Whole-house coverage, including HVAC systems.
Why It Stands Out:
This standby generator is a powerhouse designed for large homes. Operating on natural gas or propane, it provides uninterrupted power for HVAC systems, kitchen appliances, and more. The automatic transfer switch ensures seamless transitions during power outages, while Wi-Fi connectivity lets you monitor its status remotely.
Key Features:
- Dual-fuel capability (natural gas or propane).
- Automatic startup for convenience during outages.
- Quiet operation with advanced sound-reducing features.
3. Champion 7500-Watt Dual Fuel Generator (7.5 kW)
Best For: Small to medium homes or additional devices.
Why It Stands Out:
The Champion 7500-Watt Generator combines power and versatility with its dual-fuel capability. It can run on gasoline or propane, offering flexibility and long runtimes. With 7500 running watts and 9375 starting watts on gasoline, this generator is sufficient for powering refrigerators, sump pumps, and lighting during outages.
Key Features:
- Dual-fuel operation for extended usability.
- Electric start with Cold Start technology for reliability in winter.
- Portable design with a wheel kit and folding handle.
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4. Westinghouse WGen9500DF (9.5 kW)
Best For: Small to medium homes with moderate appliance use.
Why It Stands Out:
The Westinghouse WGen9500DF is a dual-fuel generator that delivers up to 9500 running watts and 12500 peak watts. It features a remote start for added convenience and a heavy-duty frame for durability. This generator is perfect for powering multiple appliances, including large refrigerators and air conditioning units.
Key Features:
- Dual-fuel operation with large capacity.
- Runs up to 12 hours on a full tank of gasoline.
- Digital data center for tracking performance.
5. EcoFlow Delta Pro (3.6 kW)
Best For: Essential appliances and renewable energy setups.
Why It Stands Out:
The EcoFlow Delta Pro is a portable power station that excels in renewable energy setups. It supports solar panel charging, making it an eco-friendly choice for off-grid living. With 3600W output and expandable battery capacity, it can handle essential devices during emergencies or outdoor trips.
Key Features:
- Solar charging compatibility for sustainable power.
- App control for real-time monitoring and adjustments.
- Lightweight and portable, weighing only 99 lbs.
6. KOHLER 20RCAL-200SELS (20 kW)
Best For: Whole-house backup for medium to large homes.
Why It’s Perfect:
The KOHLER 20RCAL-200SELS is a reliable and durable standby generator designed to provide seamless power during outages. Its 20 kW capacity can handle essential systems, including HVAC, kitchen appliances, and other critical devices. Built to withstand harsh conditions, this generator features corrosion-resistant components and a powerful motor for long-term reliability.
Key Features:
- Fuel Type: Operates on propane or natural gas for extended runtimes.
- Durable Design: Corrosion-proof enclosure for outdoor installation.
- Advanced Monitoring: Equipped with a 200-amp automatic transfer switch for seamless power transitions.
- Quiet Performance: Operates at a low decibel level compared to other standby generators.
7. DuroMax XP15000HXT (15 kW)
Best For: Emergency backup for high-power devices.
Why It Stands Out:
The DuroMax XP15000HXT is a dual-fuel generator capable of producing 15000 watts of power, enough to handle large freezers, sump pumps, and multiple air conditioners. Its heavy-duty construction and dual-fuel capability make it ideal for emergencies or demanding job sites.
Key Features:
- Dual-fuel flexibility for gasoline or propane use.
- All-metal construction for durability.
- CO Alert technology for added safety.
8. KOHLER RCA 26,000-Watt Air-Cooled Whole House Generator (26 kW)
Best For: Large homes with high power demands.
Why It’s Perfect:
The KOHLER RCA 26,000-Watt Generator is one of the most powerful air-cooled options on the market, capable of providing seamless backup for large homes. With 26 kW of capacity (on liquid propane) and PowerBoost technology, it easily handles heavy loads like central air conditioners, electric stoves, and water heaters.
Key Features:
- 26 kW capacity (LP), 24 kW (natural gas).
- KOHLER Command PRO engine for durability.
- Remote monitoring via OnCue Plus system.
- Corrosion-proof aluminum enclosure for outdoor use.
9. EF ECOFLOW 12kWh Power Station (DELTA Pro Ultra)
Best For: Renewable whole-home backup or eco-friendly off-grid living.
Why It’s Perfect:
This portable yet scalable power station offers 12 kWh of capacity and supports 7,200W output at 240V, making it capable of powering most essential household systems. With solar compatibility and expandable batteries, it’s an eco-conscious alternative to traditional generators.
Key Features:
- 12 kWh capacity for extended runtime.
- Charges via wall outlet, solar panels (up to 1,600W), or EV charging.
- Long-lasting LFP (Lithium Iron Phosphate) battery with a 10-year lifespan.
- Portable design with a trolley for mobility.
10. EF ECOFLOW DELTA Pro Ultra with Smart Home Panel 2 (6.1 kWh)
Best For: Smart home integration and daily energy optimization.
Why It’s Perfect:
The DELTA Pro Ultra with Smart Home Panel 2 seamlessly integrates with home circuits, offering automatic switchover during outages. Its 6.1 kWh capacity is expandable, and the system includes real-time energy monitoring for efficiency.
Key Features:
- 6.1 kWh capacity, expandable up to 90 kWh.
- Supports 7,200W output, capable of handling HVAC and high-demand appliances.
- Smart Home Panel 2 for real-time energy monitoring.
- Solar charging up to 5.6 kW input.
How to Choose the Right Generator
Choosing the right generator ensures you have the power you need, whether for your entire home, essential appliances, or outdoor adventures. Here’s a guide to help you decide based on your specific needs:
Quiet Operation
For noise-sensitive environments like residential areas or outdoor events, the Honda EU7000iS is an excellent choice. Its advanced inverter technology ensures clean, stable power while operating at a whisper-quiet 52–58 dB, making it ideal for homes and sensitive electronics.
Whole-House Power
If you need full home coverage, options like the Generac Guardian (22 kW) or Kohler 30RESCL (30 kW) are top contenders. These standby generators are designed to handle everything from HVAC systems to large appliances with seamless automatic operation. For medium to large homes, the KOHLER RCA 26kW or the KOHLER 20RCAL (20 kW) provide additional reliable, high-capacity solutions.
Portability
For flexible, portable power, the DuroMax XP15000HXT (15 kW) and Westinghouse WGen9500DF (9.5 kW) are excellent options. Both offer dual-fuel capability and sufficient wattage to handle critical systems during outages or to power outdoor equipment and events.
Sustainable Energy
Eco-conscious homeowners will appreciate the innovative options from EcoFlow. The EF ECOFLOW DELTA Pro (3.6 kW) is perfect for partial backup and off-grid setups, while the DELTA Pro Ultra (12kWh) and DELTA Pro Ultra with Smart Home Panel 2 (6.1kWh) offer scalable, renewable energy solutions with advanced smart monitoring for whole-home integration. These systems support solar charging, making them a sustainable choice.
Tailored Solutions for Every Need
Each generator in this list excels in its category:
- For Quiet Operation: Honda EU7000iS.
- For Whole-House Backup: Generac Guardian, Kohler 30RESCL, KOHLER RCA 26kW, or KOHLER 20RCAL.
- For Portability: DuroMax XP15000HXT or Westinghouse WGen9500DF.
- For Sustainable Energy: EcoFlow DELTA Pro models.
By understanding your power requirements—whether for emergency backup, whole-house coverage, or renewable energy setups—you can confidently select the generator that best meets your needs.
Tips for Choosing the Best Generator
- Fuel Type: Decide whether you prefer gasoline, propane, natural gas, or dual-fuel models based on availability and convenience.
- Noise Level: Some generators are quieter than others, which is especially important for residential areas.
- Automatic vs. Manual Start: Whole-house generators often include automatic transfer switches, while portable models may require manual operation.
- Maintenance: Check for models with easy maintenance features and good warranty coverage.
Why Choosing the Right Size Matters
Using a generator that’s too small can cause overloading, potentially damaging your appliances and the generator itself. On the other hand, an oversized generator could waste fuel and cost more than necessary. Matching your generator size to your power needs ensures optimal performance, safety, and efficiency.
Final Thoughts
A generator is an investment in your home’s comfort and security, especially during outages. Whether you need basic power for essential appliances or enough energy to run your entire house, there’s a generator that fits your needs. By understanding your household power requirements and exploring the options listed here, you’ll be well-equipped to make an informed decision.
When in doubt, consult a professional to calculate your exact power needs and recommend the best model for your home. With the right generator in place, you’ll enjoy peace of mind knowing your home is always powered.