When the grid goes down, a properly sized standby generator keeps your home's essential systems running — from refrigeration and well pumps to full whole-home HVAC and lighting. Choosing the right home standby generator means balancing total home electrical load, fuel type (natural gas vs. propane), transfer switch compatibility, and budget. PES Supply stocks standby generators from Generac, Kohler, Cummins, Champion, and Briggs & Stratton, ranging from 10kW portable-standby hybrids to 125kW liquid-cooled commercial units.

Browse our full Generators collection, including Standby Generators, Home Backup Generators, and Generator Accessories & Transfer Switches.

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Our Top 10 Home Standby Generators in 2026 — Quick Rankings

1. Generac 24kW 997 Guardian Series w/200A ATS — Best Overall Whole-Home Generator
2. Kohler 20RESCL 20kW + 200A RXT ATS — Best Premium Whole-Home System
3. Cummins 20kW Generator + ATS Kit — Best Cummins Value Package
4. Briggs & Stratton 076880 30kW Fortress LPV/NG — Best for Large Homes
5. Champion 14kW aXis Generator w/200A ATS — Best Budget Whole-Home Option
6. Kohler 12kW Home Generator + 100A 12-Space ATS — Best Mid-Size Kohler Package
7. Kohler 10RESV-QS8 10kW Home Standby — Best Entry-Level Standby
8. Champion 12.5kW Generator w/ATS NEMA 3R — Best Budget Outdoor-Rated ATS Package
9. Generac 22kW 997 Guardian Series w/200A ATS — Best Step-Down from 24kW
10. Briggs & Stratton 076860 60kW Liquid-Cooled Fortress — Best Commercial/Large-Estate Unit

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Detailed Reviews: Top 10 Home Standby Generators in 2026

1. Generac 24kW 997 Guardian Series w/200A ATS — Best Overall Whole-Home Generator

The Generac 24kW 997 Guardian Series is the best-selling home standby generator platform in North America, and the 24kW configuration with an included 200A service-entrance-rated transfer switch is our top overall pick for 2026. Generac's air-cooled G-Force engine platform has been refined over two decades, and the 997cc engine in this unit is sized specifically to deliver reliable full-home backup for most 2,500-5,000 sq ft homes.

Key Specifications: 24kW LP / 21.5kW NG rated output • Air-cooled Generac G-Force engine (997cc) • 200A service-entrance rated transfer switch included • Single-phase 240V • Automatic weekly self-test • Mobile Link remote monitoring • True Power Technology (less than 5% THD, safe for sensitive electronics) • 5-year limited warranty • Aluminum weather-resistant enclosure • Sound level: 67 dBA at 23 ft

Pros: Largest installer network and parts availability in North America. Included 200A SE-rated ATS simplifies whole-home installation. Mobile Link app for remote monitoring and diagnostics. Clean sine-wave output safe for electronics. Cons: Air-cooled design has shorter duty-cycle life than liquid-cooled units. Runs louder than liquid-cooled alternatives. Also see the Generac 22kW variant and 22kW without transfer switch for existing-ATS installations.

Best For: Whole-home backup for 2,500-5,000 sq ft homes, homeowners wanting the largest service/parts network.

2. Kohler 20RESCL 20kW + 200A RXT ATS — Best Premium Whole-Home System

The Kohler 20RESCL paired with Kohler's RXT 200A automatic transfer switch is a premium whole-home standby package built on Kohler's command-grade engine platform. Kohler has manufactured engines and power equipment since 1920, and their standby generator division brings that industrial engineering pedigree to residential backup power.

Key Specifications: 20kW LP / 18kW NG rated output • Kohler command PRO engine • 200A RXT automatic transfer switch included • OnCue Plus remote monitoring • 2-line LCD control panel • Aluminum enclosure with powder-coat finish • 5-year limited warranty • Sound level: 68 dBA at 23 ft • Battery: 12V group 26R (not included)

Pros: Kohler's industrial engine heritage and reputation for longevity. RXT transfer switch is UL 1008 listed with service disconnect. OnCue Plus app for remote monitoring. Strong dealer network for parts and service. Cons: Slightly higher cost than equivalent Generac packages. Battery not included — adds to installation cost. Also see the Kohler 10RESV-QS8 for smaller homes and the Kohler 12kW package for mid-size homes.

Best For: Homeowners prioritizing engine longevity and premium build quality for whole-home backup.

3. Cummins 20kW Generator + ATS Kit — Best Cummins Value Package

The Cummins 20kW Generator + ATS Kit bundles a 20kW Cummins standby generator with a matched automatic transfer switch, simplifying procurement for installers and homeowners. Cummins brings its diesel and industrial generator engineering heritage to the residential standby market, with a focus on rugged reliability.

Key Specifications: 20kW rated output (LP/NG dual fuel) • Cummins-engineered engine platform • Matched ATS included in kit • PowerCommand remote monitoring compatible • Automatic weekly exercise cycle • Weather-resistant aluminum enclosure • 5-year limited warranty

Pros: Cummins' industrial reliability reputation. Matched generator+ATS kit simplifies specification and ordering. Dual-fuel flexibility (LP or NG). Cons: Smaller residential dealer network than Generac or Kohler in some regions. Higher price point than base Cummins kit without ATS. Also see the Cummins 100A RA Series ATS sold separately for custom configurations.

Best For: Installers and homeowners wanting a matched, simplified Cummins generator+ATS specification.

4. Briggs & Stratton 076880 30kW Fortress LPV/NG — Best for Large Homes

The Briggs & Stratton 076880 Fortress 30kW steps up to liquid-cooled operation, providing the duty-cycle durability and power headroom needed for large homes (5,000+ sq ft) or homes with high-demand loads like well pumps, multiple HVAC zones, and pool equipment. Briggs & Stratton's Fortress series liquid-cooled platform is engineered for extended run-time reliability.

Key Specifications: 30kW LP / 27kW NG rated output • Liquid-cooled V-twin engine • Vanguard commercial-grade engine block • InfoHub remote monitoring • Steel enclosure with weather-resistant coating • 5-year limited warranty (10-year commercial) • Sound level: 65 dBA at 23 ft (quieter than air-cooled units) • Automatic transfer switch sold separately

Pros: Liquid-cooled design provides superior duty-cycle life over air-cooled units. Quieter operation than comparable air-cooled generators. Commercial-grade Vanguard engine block. Cons: Higher upfront cost than air-cooled alternatives. ATS sold separately, adding to total system cost. Heavier — requires more robust concrete pad. Also see the Briggs & Stratton 60kW liquid-cooled unit for even larger homes or light-commercial applications.

Best For: Large homes (5,000+ sq ft), homes with heavy well-pump or HVAC loads, buyers prioritizing quiet operation.

5. Champion 14kW aXis Generator w/200A ATS — Best Budget Whole-Home Option

The Champion 14kW aXis Generator with 200A service-entrance NEMA 3R transfer switch offers whole-home backup capability at a significantly lower price point than Generac or Kohler equivalents. Champion's aXis control platform provides smartphone monitoring and diagnostics, bringing modern connected features to a budget-tier generator.

Key Specifications: 14kW LP / 12.5kW NG rated output • Champion aXis smart control system • 200A NEMA 3R outdoor-rated transfer switch included • Bluetooth and Wi-Fi connectivity via Champion app • Automatic weekly self-test • Aluminum enclosure • 5-year limited warranty (residential) • Sound level: 68 dBA

Pros: Significant cost savings versus Generac/Kohler equivalents. Included 200A ATS. Modern app-based monitoring via aXis platform. Cons: Smaller dealer/service network than the "big three" brands. 14kW may not cover full whole-home loads in larger homes — sizing consultation recommended. Also see the Champion 14kW w/100A ATS and Champion 14kW w/150A ATS for smaller service panels.

Best For: Budget-conscious buyers wanting whole-home coverage with modern connected features.

6. Kohler 12kW Home Generator + 100A 12-Space ATS — Best Mid-Size Kohler Package

The Kohler 12kW Home Generator bundled with a 100A 12-circuit transfer switch is designed for partial-home backup — covering essential circuits like HVAC, refrigeration, well pump, and lighting without the cost of a full whole-home system. The 12-space load center allows selective circuit prioritization.

Key Specifications: 12kW LP / 10.5kW NG rated output • Kohler command PRO engine • 100A 12-circuit transfer switch/load center included • OnCue Plus monitoring compatible • Aluminum enclosure • 5-year limited warranty • Compact footprint for tighter installation sites

Pros: Kohler engine reliability at a mid-size price point. 12-circuit load center allows selective backup without full panel interconnection. Compact footprint. Cons: 100A/12-circuit limits coverage to essential loads only, not whole-home. Not suitable for homes with electric heat or large HVAC loads. Also see the Kohler 10RESV-QS8 for an even smaller footprint.

Best For: Partial-home essential-circuit backup, smaller homes, budget-conscious Kohler buyers.

7. Kohler 10RESV-QS8 10kW Home Standby — Best Entry-Level Standby

The Kohler 10RESV-QS8 is Kohler's entry-level home standby generator, designed for essential-circuit backup in smaller homes and as an affordable entry point into the Kohler standby ecosystem. Despite its entry-level positioning, it retains Kohler's core engineering and OnCue monitoring compatibility.

Key Specifications: 10kW LP / 9kW NG rated output • Kohler command PRO twin-cylinder engine • 2-line LCD controller • OnCue Plus monitoring compatible (module sold separately) • Aluminum enclosure • 5-year limited warranty • Compact footprint • Transfer switch sold separately

Pros: Lowest-cost entry into the Kohler standby lineup. Compact footprint suits smaller lots. Proven Kohler command PRO engine platform. Cons: Transfer switch sold separately, adding to total installed cost. 10kW covers essential circuits only, not whole-home. Also see the Kohler 10kW w/100A 12-Circuit ATS bundle for a complete package.

Best For: Small to mid-size homes needing essential-circuit backup, budget-conscious Kohler buyers.

8. Champion 12.5kW Generator w/ATS NEMA 3R — Best Budget Outdoor-Rated ATS Package

The Champion 12.5kW Generator with an included 100A NEMA 3R outdoor-rated select-circuit transfer switch is Champion's value-tier partial-home backup solution. The select-circuit switch allows homeowners to prioritize essential loads while keeping installation costs low.

Key Specifications: 12.5kW LP / 11kW NG rated output • 100A NEMA 3R outdoor-rated select-circuit transfer switch included • Automatic weekly self-test • Aluminum enclosure • 5-year limited warranty (residential) • Compact footprint

Pros: Lowest all-in cost for a generator+ATS package in our top 10. Outdoor-rated NEMA 3R switch eliminates need for indoor panel space. Cons: Select-circuit switch limits coverage versus full service-entrance ATS. Smaller Champion dealer network in some regions. Also see the Champion 12.5kW ATS-compatible-only version for custom switch configurations.

Best For: Budget-conscious partial-home backup, homeowners without indoor panel space for an ATS.

9. Generac 22kW 997 Guardian Series w/200A ATS — Best Step-Down from 24kW

The Generac 22kW 997 Guardian Series shares the same platform and included 200A transfer switch as the 24kW model at a lower price point, making it an excellent choice for homes that don't quite need the full 24kW capacity. It's built on the same proven 997cc G-Force engine and enclosure.

Key Specifications: 22kW LP / 19.5kW NG rated output • Air-cooled Generac G-Force engine (997cc) • 200A service-entrance rated transfer switch included • Mobile Link remote monitoring • True Power Technology • 5-year limited warranty • Aluminum enclosure

Pros: Same reliable platform as the 24kW at a lower cost. Included 200A ATS. Mobile Link app monitoring. Cons: Slightly less headroom than the 24kW for future load additions (EV chargers, pool equipment). Also see the Generac 22kW without transfer switch for existing-ATS installations.

Best For: Whole-home backup for 2,000-4,000 sq ft homes on a tighter budget than the 24kW.

10. Briggs & Stratton 076860 60kW Liquid-Cooled Fortress — Best Commercial/Large-Estate Unit

The Briggs & Stratton 076860 Fortress 60kW is a liquid-cooled commercial-grade standby generator suited for large estates, small commercial buildings, and light-industrial backup applications. At 60kW, it can handle whole-building loads well beyond typical residential needs.

Key Specifications: 60kW LP / 54kW NG rated output • Liquid-cooled commercial engine • InfoHub remote monitoring • Steel weather-resistant enclosure • 5-year limited warranty (10-year commercial available) • Three-phase and single-phase configurations available • Requires professional installation and permitting

Pros: Commercial-grade duty cycle and reliability. Handles large-estate or light-commercial loads. Liquid-cooled for extended run times. Cons: Significant upfront investment (~$27,274). Requires substantial concrete pad and professional electrical/gas installation. Also see Briggs & Stratton 80kW and 125kW liquid-cooled units for even larger commercial applications.

Best For: Large estates, small commercial buildings, light-industrial backup power applications.

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Home Generator Comparison Table — Top 10 Models 2026

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Home Generator Buying Guide: What to Look for in 2026

1. Sizing Your Generator

Whole-home backup typically requires 20-24kW for homes 2,500-5,000 sq ft with central air conditioning. Partial-home/essential-circuit backup (refrigeration, well pump, select HVAC, lighting) can be handled with 10-14kW units. Homes with electric heat, large HVAC systems, pools, or EV chargers should consider 24kW or liquid-cooled 30kW+ units. A licensed electrician should perform a load calculation before finalizing generator size.

2. Automatic Transfer Switch (ATS) Requirements

An ATS is required by code for any generator that connects to household wiring — it safely disconnects from the utility grid before energizing the home circuit, protecting utility line workers and preventing backfeed. Service-entrance-rated ATS units (100A-200A) enable whole-home switching; select-circuit or load-center ATS units (8-16 circuits) enable partial-home backup at lower cost. Always confirm ATS amperage matches your home's service panel rating.

3. Fuel Type: Liquid Propane vs. Natural Gas

Most standby generators are dual-fuel rated, running on either liquid propane (LP) or natural gas (NG), with LP typically producing 10-12% higher rated output than NG on the same engine. Homes with existing NG utility service avoid the need for a propane tank; rural homes typically install a 250-500 gallon LP tank for extended run-time autonomy during multi-day outages.

4. Air-Cooled vs. Liquid-Cooled

Air-cooled generators (typically under 26kW) are less expensive and suitable for intermittent residential outages. Liquid-cooled generators (30kW and above) are engineered for extended continuous-duty operation, are quieter, and have a longer service life — making them the standard choice for large homes, commercial buildings, and locations with frequent or extended grid outages.

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Expert Verdict: Which Generator is Best for Your Home?

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Frequently Asked Questions — Home Generators 2026

Q: What size generator do I need for my home?

Whole-home backup for a 2,500-5,000 sq ft home with central AC typically requires 20-24kW. Partial-home/essential-circuit backup (refrigeration, well pump, select HVAC circuits, lighting) can be handled with 10-14kW units. Always have a licensed electrician perform a load calculation based on your specific home's electrical panel and appliance loads before finalizing generator size.

Q: Do I need a transfer switch with my generator?

Yes. An automatic transfer switch (ATS) is required by electrical code for any standby generator connected to household wiring. It safely isolates your home from the utility grid before the generator energizes your circuits, preventing dangerous backfeed onto utility lines. Some of our packages, like the Generac 24kW w/200A ATS, include a matched transfer switch; others require selecting one separately.

Q: What's the difference between liquid propane and natural gas generators?

Most modern standby generators are dual-fuel rated for both LP and NG, though rated output is typically 10-12% lower on natural gas due to its lower energy density. Natural gas offers unlimited run-time as long as utility gas service continues; LP requires an on-site tank (commonly 250-500 gallons) but is more resilient during regional NG service disruptions.

Q: How long does a standby generator installation take?

A typical residential installation takes 1-3 days including concrete pad pouring, electrical and gas line connection, transfer switch wiring, and commissioning, though permit approval timelines vary significantly by municipality (often 2-6 weeks). PES Supply ships generator and ATS orders within 7-10 business days; installation scheduling with a licensed electrician/gas contractor is separate from shipping lead time.

Q: Air-cooled or liquid-cooled — which should I choose?

Air-cooled generators (typically 10-26kW) are less expensive and well-suited to homes expecting occasional, intermittent outages. Liquid-cooled generators (30kW+) are engineered for extended continuous-duty cycles, run quieter, and have a longer service life, making them the better choice for large homes, frequent multi-day outages, or light-commercial applications like the Briggs & Stratton Fortress 30kW.

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