7 Best Generac Home Backup Power Systems for Outages (2026)

By Lauren Holland

Updated November 2026

Generac home backup power systems are among the most widely installed options for keeping a house running when the grid goes down, and the lineup ranges from permanent whole-home standby units to a portable inverter generator for lighter loads. This guide ranks seven Generac and Honeywell-branded models so you can match a unit to your home’s size, fuel access and outage habits. Our selection criteria were specification fit (kilowatt output, transfer switch type, fuel options), brand reputation for service and parts, and patterns that owners frequently mention in their feedback, such as noise, installation complexity and monitoring features. We did not run these units ourselves; everything below is drawn from manufacturer listings and commonly reported owner experiences.

Our Top Picks

Generac 14kW Whole Home Generator, Transfer Switch & Cellular Capability

Generac 14kW Whole Home Generator, Transfer Switch & Cellular Capability | Whole House Backup Power, Automatic 200 Amp Transfer Switch, Outdoor Gas Propane, Protects Home Outages, Storm Protection

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Best for: Overall whole-home coverage for an average-size house

This is a permanent standby unit suited to homeowners who want the house to keep running through extended outages without manually starting anything. Its 14kW rating is generally considered enough for a typical home with central air, a refrigerator, lighting and a well pump, though larger households may need to prioritize circuits.

Key specs

• 14kW rated output
• Automatic 200 amp transfer switch
• Outdoor installation with natural gas or propane fuel
• Cellular capability for remote status

Pros

• Starts automatically when utility power fails
• Covers the whole house rather than selected circuits
• Generac’s dealer and service network is broad in many regions

Cons

• Professional installation and a gas line are required
• Permanent installation is a larger commitment than a portable unit

Bottom line: A strong first choice for a mid-size home that needs seamless, hands-off backup.

Generac 22kW Whole Home Generator, Transfer Switch & Cellular Capability

Generac 22kW Whole Home Generator, Transfer Switch & Cellular Capability | Whole House Backup Power, Automatic 200 Amp Transfer Switch, Outdoor Gas Propane, Protects Home Outages, Storm Protection

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Best for: Homes with central air and electric heat

The 22kW output gives more headroom for homes where the air conditioner, electric range and water heater might run at the same time during an outage. It suits households that want fewer load-management decisions during a storm.

Key specs

• 22kW rated output
• Automatic 200 amp transfer switch
• Natural gas or propane fuel
• Cellular capability

Pros

• More capacity than 14kW units for heavy simultaneous loads
• Automatic operation with no manual startup
• Works with an existing gas supply in many installations

Cons

• Higher output usually means a larger footprint and more fuel use
• Needs professional sizing and installation

Bottom line: Best for households with high-draw appliances that want room to spare.

Generac Guardian 22kW Home Generator, Transfer Switch & WiFi Monitoring

Whole House Backup Power, Natural Gas Or Propane, WiFi Monitoring, Automatic Transfer, Storm And Outage Protection Generac Guardian 22kW Home Generator, Transfer Switch & WiFi Monitoring

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Best for: Owners who want to check status remotely

This model is aimed at people who are away from home for long periods or who manage a second property. WiFi monitoring lets you check generator status and receive alerts from a phone.

Key specs

• 22kW rated output
• Automatic transfer switch
• Natural gas or propane
• WiFi monitoring

Pros

• Remote status alerts are useful for vacation homes
• Automatic transfer during outages
• Works with both natural gas and propane

Cons

• WiFi monitoring depends on a working home network during outages
• Installation cost and permitting vary by location

Bottom line: A good pick for remote owners who want visibility into their backup system.

Generac 26kW Whole Home Generator, Cellular Capability

Generac 26kW Whole Home Generator, Cellular Capability | Automatic Backup Power, Whole House Coverage, WiFi & Cellular Monitoring, Weather-Activated, Natural Gas or Propane Ready

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Best for: Large homes with high simultaneous loads

At 26kW this is the highest-output unit in this list. It fits large homes, or homes with well pumps, pool equipment and electric heating that all need to run together.

Key specs

• 26kW rated output
• Whole-house coverage
• WiFi and cellular monitoring
• Natural gas or propane ready

Pros

• Highest capacity here for demanding homes
• Weather-activated automatic start
• Dual connectivity options for monitoring

Cons

• Larger footprint and higher fuel consumption than smaller units
• May be oversized for a modest home, adding unnecessary cost

Bottom line: Choose this if a load calculation shows you need more than 22kW.

Generac 24kW Whole Home Generator, Transfer Switch & Cellular Capability

Generac 24kW Whole Home Generator, Transfer Switch & Cellular Capability | Whole House Backup Power, Automatic 200 Amp Transfer Switch, Outdoor Gas Propane, Protects Home Outages, Storm Protection

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Best for: Mid-to-large homes that want propane or natural gas flexibility

The 24kW rating sits between the 22kW and 26kW models, making it a reasonable middle option for homes that outgrow a 14kW unit but do not need the largest output.

Key specs

• 24kW rated output
• Automatic 200 amp transfer switch
• Outdoor installation
• Natural gas or propane fuel

Pros

• Balanced capacity for larger homes
• Automatic transfer during outages
• Fuel flexibility for different site conditions

Cons

• Requires professional installation and a fuel supply line
• Fuel consumption rises with load

Bottom line: A practical middle-tier choice when you need more than 14kW but not the full 26kW.

Generac 3,300 Starting Watt Gas Powered Portable Inverter Generator

Generac 3,300 Starting Watt Gas Powered Portable Inverter Generator | 2,500 Running Watts, Clean Stable Power, Lightweight, RV Ready, Home Backup, Camping, 49 State Compliant

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Best for: Essentials during short outages, plus camping and RV use

This is a portable inverter generator rather than a standby system. It is a lower-cost route to backup for a refrigerator, lights, phone charging and a small heater, but it must be started and fueled by hand.

Key specs

• 3,300 starting watts, 2,500 running watts
• Inverter design for cleaner power
• Lightweight and portable
• Gas powered

Pros

• Portable and usable for camping or RV trips too
• Inverter output is suitable for sensitive electronics
• No professional installation required

Cons

• Manual startup and refueling during an outage
• Cannot run a whole house or large central air systems

Bottom line: The right pick if you want low-commitment backup for critical loads, not whole-house coverage.

Honeywell 14kW Home Standby Generator

Honeywell 14kW Home Standby Generator – Automatic Backup Power for Whole Home – Runs on Natural Gas or Propane – Weather-Resistant Enclosure – Installation Pad Included

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Best for: Buyers who prefer a non-Generac brand

This 14kW standby unit runs on natural gas or propane and comes with an installation pad and weather-resistant enclosure. It suits homeowners comparing standby options across brands.

Key specs

• 14kW rated output
• Natural gas or propane
• Weather-resistant enclosure
• Installation pad included

Pros

• Installation pad is included
• Automatic standby operation
• Same capacity class as a popular Generac model

Cons

• Service network may be less familiar in some areas
• Professional installation still required

Bottom line: A solid alternative if you have already checked local dealer support for this brand.

Buying Guide

Output capacity (kilowatts)

Add up the running watts of the appliances you want during an outage, then add startup surges for motors such as central air and well pumps. Standby units are usually rated in kilowatts, so convert your total into kW and choose the next size up for headroom.

Good picks for this: Generac 14kW Whole Home Generator, Generac 22kW Whole Home Generator

Standby versus portable design

Standby units are permanently installed, connect to your gas line and transfer power automatically. Portable inverter generators are cheaper to get started with but need manual setup and fueling. Decide which trade-off you can live with before comparing models.

Good picks for this: Generac 22kW Whole Home Generator, Generac 3,300 Starting Watt Portable Inverter

Fuel type

Natural gas is typically connected to your utility line and can run for long periods, while propane is stored in tanks and works where no gas line exists. Check your home’s existing gas supply and whether a tank can be placed safely outside.

Good picks for this: Generac 24kW Whole Home Generator, Honeywell 14kW Home Standby Generator

Transfer switch and automation

An automatic transfer switch detects outages and starts the generator without user input. Check the amperage rating, since a 200 amp switch is common for whole-home systems.

Good picks for this: Generac Guardian 22kW Home Generator, Generac 26kW Whole Home Generator

Remote monitoring and connectivity

WiFi or cellular monitoring lets you check status and receive alerts. Note that WiFi depends on your home network staying powered, while cellular connections use the carrier’s network and may be more reliable during a storm.

Good picks for this: Generac Guardian 22kW Home Generator, Generac 14kW Whole Home Generator

Installation and site requirements

Standby units need a level pad, clearance from the house and windows, a fuel line and often a permit. Many homeowners also need an electrician to connect the transfer switch. Ask about local codes early, because they vary widely.

Good picks for this: Honeywell 14kW Home Standby Generator, Generac 24kW Whole Home Generator

Noise, maintenance and durability

Owners often mention that standby units run a self-test periodically and that regular maintenance, such as oil and filter changes, keeps them reliable. Check the manufacturer’s service interval and whether a local dealer can support the unit.

Good picks for this: Generac 22kW Whole Home Generator, Generac 14kW Whole Home Generator

FAQ

How many kilowatts do I need to back up a whole house?

Most average homes fall somewhere between 14kW and 22kW, but the answer depends on your largest simultaneous loads. An electrician or dealer can perform a load calculation based on your electric bills and appliance list.

Can a portable Generac generator power my whole house?

Generally no. A portable inverter unit like a 3,300 starting watt model is suited to critical circuits such as a refrigerator, lights and devices. Whole-house coverage requires a standby system with a transfer switch.

Do standby generators need professional installation?

Yes, in most cases. Connecting to a gas line, mounting the unit and wiring the transfer switch usually require licensed professionals and permits. Check your local requirements before purchasing.

Is natural gas or propane better for a standby generator?

Natural gas is convenient if your home already has a gas line and offers a continuous supply. Propane works when there is no gas line, but you need a tank and monitoring of fuel levels. Both are used successfully by owners.

How often should a home standby generator be serviced?

Follow the manufacturer’s maintenance schedule, which typically includes periodic oil changes, filter checks and inspection of the battery and transfer switch. A licensed technician can confirm the right interval for your unit.

Do WiFi monitoring features work during an outage?

They can be unreliable if your home router loses power. Cellular monitoring may work independently of your home network, which some owners prefer for storm conditions.

Note: sizing, gas line work and electrical connections are safety-critical. Consult a licensed electrician, a qualified generator dealer or your local building authority before purchasing or installing any system.

Conclusion

For most whole-home needs, a Generac standby unit in the 14kW to 24kW range is the practical starting point, and the right size depends on your load calculation rather than the brand alone. The 14kW model suits average homes, the 22kW and 24kW options fit larger households with heavy loads, and the 26kW model is for the most demanding homes. The Guardian with WiFi monitoring suits owners who want remote visibility. If you only need essentials during short outages or want a portable option for travel, the 3,300 starting watt inverter is the better fit. The Honeywell standby unit is a reasonable alternative if you have already confirmed dealer support for that brand.

Sources

• Guidance on home energy use, backup power planning and how to evaluate electrical loads (energy.gov)
• Safety recalls and carbon monoxide and generator safety guidance for home use (cpsc.gov)
• Fire and electrical safety codes that apply to permanent and portable generator installations (nfpa.org)

Related reading

• Generac Generators for Home Backup Power: 6 Best Picks (2026)
• Whole-Home Backup Power Solution: How to Size One for Outages (2026)
• Whole Home Power Backup System: How to Size One for Outages (2026)
• Top 5 EcoFlow Solar Power Generator Picks for Home Backup
• Top 5 EcoFlow Power Stations with Solar Panel Options for Home Backup (2026)
• Solar Power Backup System for Home: A Step-by-Step Sizing Guide (2026)

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our solar generators for home backup & emergencies guides, checking product details against manufacturer specifications and owner feedback.