Best Home Generators
of 2026
The average U.S. power outage now lasts nearly eight hours — and in storm-prone markets like the Southeast, multi-day outages are increasingly routine. The right generator depends on whether you need automatic whole-home coverage or portable backup you can take anywhere.
⚡ 20 Models Evaluated
🏠 2 Generator Types
⭐ 10 Full Reviews
⚠️ Affiliate Disclosure
This page contains affiliate links. We may earn a commission if you purchase through these links, at no additional cost to you. Our rankings are based on documented generator performance — output capacity, run time, reliability data, and installer feedback — not commission rates. Read our full methodology.
⚠️ Safety Notice: Never operate a gasoline or propane generator indoors, in a garage, or in any enclosed or partially enclosed space. Generator exhaust contains carbon monoxide, which is odorless and can be fatal within minutes. Standby generators must be installed by a licensed electrician. Portable generators require a transfer switch or interlock kit — never backfeed into your home’s electrical panel. Always follow manufacturer safety instructions.
How NME Evaluates Home Generators
20
Models Evaluated
10
Full Reviews
2
Generator Types
8hrs
Avg U.S. Outage
Sources: U.S. Energy Information Administration outage duration data, FEMA home backup power guidance, manufacturer specification documentation, licensed electrician and HVAC installer feedback, and ENERGY STAR certified generator database. No brand paid for placement.
The most important generator decision is type — standby or portable — and that decision should be made before evaluating any specific brand. Standby generators start automatically when power fails, run on natural gas or propane, and can cover your entire home indefinitely. Portable and inverter generators require manual startup, run on gasoline or dual fuel, and cover selected loads or critical appliances. They solve different problems for different homeowners.
NME’s 5 ranking criteria: (1) Validated output capacity — rated vs. surge wattage and real-world load coverage. (2) Reliability — manufacturer reputation, engine heritage, and installer feedback. (3) Fuel flexibility and run time — natural gas, propane, gasoline, or dual/tri-fuel configurations. (4) Ease of installation and operation — transfer switch compatibility, automatic start, and monitoring capability. (5) Value — performance relative to installed cost and warranty terms.
The #1 Best Home Generator for 2026
Generac Guardian 22kW — NME’s #1 Best Standby Generator of 2026
The Generac Guardian 22kW earns the top position among standby generators through the combination of market-leading output capacity, the most competitive installed cost per kilowatt of any air-cooled standby generator available, and the deepest installer and dealer network in the country. Eight out of ten home standby generators installed in the U.S. are Generac — that market penetration means certified installers are available in virtually every metro market, parts are universally available, and the service ecosystem is mature. Mobile Link Wi-Fi monitoring, True Power Technology for clean sine wave output, and a 5-year limited warranty round out the package. For homeowners wanting reliable automatic whole-home backup, Generac Guardian 22kW is where to start.
Compare the Top Home Generators for 2026
Ten leading generators compared by type, output, fuel, key feature, and best-fit household — sorted standby first, then portable/inverter.
| Generator | Type | Output | Fuel | Best For |
|---|---|---|---|---|
| 🏆 Generac Guardian 22kW | ⭐Standby — Automatic | 22kW rated | NG / LP | Best Overall Standby |
| 🥈 Kohler 20RCAT | Standby — Automatic | 20kW rated | NG / LP | Best Premium / Heavy-Load |
| 🥉 Cummins RS20A | Standby — Automatic | 20kW rated | ⭐NG / LP — quietest standby | Best Quiet Standby |
| Champion 14kW | Standby — Automatic | 14kW rated | NG / LP | Best Value Standby |
| Briggs & Stratton 20kW | Standby — Automatic | 20kW rated | NG / LP | Best for Smaller Budgets |
| Honda EU2200i | Inverter — Portable | ⭐1,800W rated / 2,200W surge | Gasoline | Best Inverter — Quiet & Reliable |
| DuroMax XP11000iH | Inverter — Portable | 9,000W rated / 11,000W surge | ⭐Gas + Propane (Dual Fuel) | Best High-Output Inverter |
| Westinghouse iGen4500 | Inverter — Portable | 3,700W rated / 4,500W surge | Gasoline | Best Mid-Range Inverter |
| Champion 3500W Dual Fuel | Portable — Open Frame | 3,500W rated / 4,000W surge | Gas + Propane | Best Budget Dual-Fuel |
| Jackery Explorer 2000 Plus | Battery — Solar Capable | ⭐2,000Wh / 3,000W output | Battery / Solar | Best Indoor / Zero Emissions |
⭐ = NME Category Leader. kW = kilowatts (standby). W = watts (portable). NG = natural gas. LP = liquid propane. Wh = watt-hours (battery capacity). Standby generators require licensed electrician installation and automatic transfer switch. All external links verified June 2026.
🏠 Part 1 — Standby Generators
Best Standby Generators of 2026 — Full Reviews
Permanently installed, automatic whole-home backup. Runs on natural gas or propane. Starts within seconds of a power failure — no manual intervention required. Must be installed by a licensed electrician.
1
🏆
Generac Guardian 22kW Standby
Best Overall Standby Generator
★★★★★
Generac is the #1 selling home standby generator brand by a significant margin — eight out of ten home standby generators installed in the U.S. are Generac, which is not a marketing claim but a verifiable market share figure. That dominance matters practically: certified Generac installers exist in virtually every U.S. metro market, replacement parts are universally stocked, and every licensed electrician in the country has worked alongside Generac systems. The 22kW Guardian is the sweet spot in Generac’s lineup — enough output to power a full-size home including central air conditioning, water heater, refrigerators, and all critical circuits simultaneously on most residential loads.
The G-Force Engine is Generac’s proprietary purpose-built generator engine, pressure-lubricated and designed specifically for the rigors of standby use — as opposed to engines adapted from lawn or automotive applications. True Power Technology produces less than 5% total harmonic distortion, which means clean sine wave output safe for sensitive electronics including medical equipment and computers. Mobile Link Wi-Fi monitoring is included free with every Guardian unit and allows remote status checking, maintenance alerts, and exercise scheduling from any smartphone. The 5-year limited warranty is the longest offered by any major standby generator brand in this price tier. Runs on natural gas (continuous supply, no refueling) or liquid propane.
✓ Pros
- Largest installer and dealer network in the country — certified techs everywhere
- 22kW rated output — covers most whole-home loads including central AC
- G-Force Engine — purpose-built for generator use, not adapted
- Mobile Link Wi-Fi monitoring included free
- 5-year limited warranty — longest in class at this price
- Lowest installed cost per kilowatt among air-cooled standby generators
✗ Cons
- Quality control concerns with electronics/controllers on older models — recent production improved
- Requires licensed electrician installation — adds to total cost
- Air-cooled: less efficient at extreme temperatures than liquid-cooled commercial units
View Generac →
Best Standby
2
🥈
Kohler 20RCAT Standby
Best Premium Standby Generator / Best for Heavy Loads
★★★★★
Kohler (whose parent company Kohler Energy rebranded to Rehlko in 2025, though the KOHLER generator brand continues unchanged) is the brand most commonly preferred by licensed electricians and HVAC professionals who install generators for a living — and increasingly, by contractors who previously installed Generac. Kohler’s competitive advantage is mechanical durability: the Command PRO engine uses hydraulic valve lifters (eliminating the need for valve adjustments and reducing maintenance), a V-twin configuration that handles heavy loads with less mechanical stress, and a build quality that trades some affordability for long-term reliability. For large homes with multiple HVAC systems, sump pumps, well pumps, and high simultaneous electrical demand, Kohler’s PowerBoost technology delivers measurably better load management.
PowerBoost technology is Kohler’s most significant technical differentiator — it allows the generator to handle large motor-start loads (central air conditioning compressors, well pumps) without dropping voltage or power to other circuits simultaneously, which is the most common failure point in standby generator performance during high-load events. The all-aluminum enclosure on the RCAT model resists corrosion and weathering better than composite enclosures. Kohler’s 5-year limited warranty matches Generac’s coverage. The primary trade-off is cost — Kohler systems typically run higher than comparable Generac units — and a somewhat smaller installer network, though still extensive nationally.
✓ Pros
- Preferred brand among professional installers for mechanical durability
- PowerBoost — handles large motor-start loads without dropping other circuits
- Hydraulic valve lifters — eliminates valve adjustment maintenance
- All-aluminum enclosure — superior corrosion resistance
- V-twin Command PRO engine — commercial-grade heritage
✗ Cons
- Higher purchase price than comparable Generac output
- Smaller installer network — may be limited in some rural markets
- Controller electronics have drawn some criticism historically
View Kohler Generators →
Premium Standby
3
🥉
Cummins RS20A Standby
Best Quiet Standby Generator
★★★★★
Cummins is a name better known in commercial power and heavy truck engines than residential generators, but that industrial heritage is precisely the reason the RS20A earns this position. Cummins entered the residential standby generator market with a focus on noise reduction and engine longevity — two areas where decades of commercial engine engineering gave them a measurable head start. The RS20A operates at one of the lowest noise levels in the 20kW standby class, making it the right choice for homeowners in neighborhoods with noise ordinances, properties with close lot lines, or households where generator noise during extended outages is a meaningful quality-of-life concern.
The Cummins QuietConnect enclosure is specifically engineered for noise reduction at the enclosure level — not just quieter engine tuning, but a system-level acoustic design. The 20kW output covers the vast majority of whole-home loads. Cummins’ Evo Controller provides remote monitoring and exercise scheduling with a clean interface. The 5-year limited warranty covers parts and labor on the generator system. The practical limitation is Cummins’ smaller residential dealer and installer network compared to Generac — in some markets, finding a certified Cummins residential installer requires more lead time. Worth confirming installer availability in your specific area before committing.
✓ Pros
- Quietest operation in the 20kW standby class
- Cummins commercial engine heritage — industrial-grade reliability basis
- QuietConnect system-level acoustic design
- Evo Controller with remote monitoring
- 5-year limited warranty
✗ Cons
- Smaller residential installer network than Generac
- Higher cost than Generac at comparable wattage
- Installer availability varies by market — confirm before purchasing
View Cummins →
Quiet Pick
4
💰
Champion 14kW Home Standby Standby
Best Value Standby Generator
★★★★☆
Champion Power Equipment entered the standby generator market as the value alternative to Generac and Kohler — and the 14kW model delivers on that positioning. For homes that don’t require the 20–26kW output capacity of a full whole-home Generac installation, the Champion 14kW provides automatic standby power for critical circuits including central air, refrigerators, lighting, and outlets at a meaningfully lower purchase price. The aXis controller handles automatic transfer and remote monitoring. Champion backs the unit with a 10-year limited warranty on the engine — the longest engine warranty in the residential standby category, which is a meaningful long-term signal from a manufacturer that started as a portable generator specialist.
The 14kW output is appropriate for smaller homes or homes where the standby system is sized to cover critical loads rather than every circuit simultaneously. Champion uses a proprietary engine rather than the Generac G-Force or Kohler Command Pro, and the installer network is smaller than both established brands. For homeowners in markets with available Champion-certified installers who want automatic standby backup at lower initial cost, the 14kW is a solid entry into the category. The 10-year engine warranty reflects Champion’s confidence and partially offsets the lower-brand-recognition concern.
✓ Pros
- Lower purchase cost than Generac or Kohler at comparable configuration
- 10-year limited engine warranty — longest engine warranty in the category
- Sufficient output for critical loads in smaller homes
- aXis controller with automatic transfer and remote monitoring
✗ Cons
- 14kW may not cover full whole-home loads in larger residences
- Smaller installer network than Generac
- Shorter market track record than Generac or Kohler in standby segment
View Champion →
Value Standby
5
🔧
Briggs & Stratton 20kW Standby
Best Entry-Level 20kW Standby
★★★★☆
Briggs & Stratton is one of the most recognized small engine brands in North America — their engines power lawn mowers, pressure washers, and outdoor power equipment in millions of households. The 20kW home standby generator brings that engine heritage into the standby generator space at a purchase price below Generac’s 22kW equivalent. The Symphony II transfer switch technology allows load management across multiple circuits, prioritizing power distribution during high-demand periods. The 5-year limited warranty covers the unit and transfer switch.
The primary caveat with Briggs & Stratton is their 2020 bankruptcy and subsequent acquisition — the brand has been restructured and continues to manufacture generators, but the service network and parts availability have experienced disruption that some owners report as an ongoing frustration. The product itself is mechanically sound; the concern is post-sale support infrastructure. Homeowners who confirm strong local Briggs & Stratton service availability before purchasing will find the 20kW unit to be a capable whole-home backup option at competitive pricing. Those in markets with thin service coverage should consider Generac instead.
✓ Pros
- Recognized Briggs & Stratton engine heritage
- 20kW output — whole-home capable for most residences
- Symphony II load management transfer switch
- Competitive pricing vs. Generac at comparable wattage
- 5-year limited warranty
✗ Cons
- Brand underwent 2020 bankruptcy — service network disruption reported by some owners
- Confirm local service availability before purchasing
- Less installer density than Generac nationally
View Briggs & Stratton →
Entry 20kW
⚡ Part 2 — Portable & Inverter Generators
Best Portable & Inverter Generators of 2026 — Full Reviews
Manual-start, portable backup. Runs on gasoline, propane, or both. Requires a transfer switch or interlock kit for safe home connection — never plug into a wall outlet or backfeed your panel. Inverter models produce clean sine wave power safe for sensitive electronics.
6
🏅
Honda EU2200i Inverter
Best Inverter Generator — Reliability & Quiet Operation
★★★★★
The Honda EU2200i is the benchmark by which every other portable inverter generator is measured — and it has held that position for years without serious challenge. Honda’s GXR120 Commercial Series engine is the most reliable small engine in the category, with a service network so deep that virtually every small engine repair shop in the country stocks EU2200i parts. The practical implication: if this generator stops working in any U.S. town during an extended power outage, you can get it repaired. No other portable generator brand offers that level of service infrastructure.
At 1,800 rated watts and 2,200 surge watts, the EU2200i is not a whole-home solution — it’s the right generator for powering a refrigerator, window air conditioner, CPAP machine, phone chargers, and essential lighting during an outage. The Eco Throttle system automatically adjusts engine speed to match the actual load, reducing fuel consumption and operating noise to as low as 48 dB — quieter than a normal conversation. Two EU2200i units can be paralleled with a Honda parallel cable for 3,600W of combined output. The CO-Minder carbon monoxide detection shuts the unit down automatically if CO levels approach dangerous thresholds, which is the industry’s strongest built-in safety feature for portable generators.
✓ Pros
- Most reliable inverter generator — widest service and parts network of any brand
- 48-57 dB — one of the quietest generators in its class
- CO-Minder carbon monoxide auto-shutoff
- Eco Throttle — adjusts speed to load, extending run time and reducing noise
- Parallel capable — two units = 3,600W combined
- Starts reliably after extended storage with fuel treatment
✗ Cons
- 1,800W rated output — not sufficient for central AC or well pumps
- Gasoline only — no dual-fuel option on this model
- Premium pricing relative to budget inverter alternatives
View Honda EU2200i →
Best Inverter
7
💪
DuroMax XP11000iH Inverter
Best High-Output Inverter Generator
★★★★★
The DuroMax XP11000iH is the inverter generator that bridges the gap between portable power and whole-home standby coverage. At 9,000 rated watts and 11,000 surge watts, it can power central air conditioning, a well pump, refrigerator, and lighting simultaneously — loads that require a standby generator from any other portable brand. The dual-fuel capability (gasoline or propane) adds resilience: when gasoline is unavailable during a natural disaster or extended outage, propane stored in standard tanks keeps the unit running. Propane also stores indefinitely without fuel degradation, which is a meaningful advantage over gasoline for emergency preparedness.
The inverter design produces clean sine wave output with low total harmonic distortion, making it safe for sensitive electronics including computers and medical equipment — a meaningful advantage over traditional open-frame generators at similar wattage. The XP11000iH includes a wheel kit for mobility and an electric start. DuroMax’s reputation has grown substantially in the portable generator market over the past decade, with a track record of delivering high-output performance at pricing well below Honda or comparable standby installations. The trade-off vs. Honda is reliability longevity — DuroMax engines are solid for years of regular use but don’t carry the same multi-decade reliability track record as Honda’s GXR series.
✓ Pros
- 9,000W rated — can power central AC, well pump, and refrigerator simultaneously
- Dual-fuel (gas + propane) — resilience when one fuel source is unavailable
- Inverter clean sine wave — safe for electronics and medical equipment
- Electric start
- Significantly lower cost than standby alternatives
✗ Cons
- Heavy — requires wheel kit for mobility
- Louder than Honda inverters at comparable output
- Manual start requirement — must be outside and started before power is needed
- Gasoline/propane storage and refueling required during extended outages
View DuroMax →
High-Output Inverter
8
⚡
Westinghouse iGen4500 Inverter
Best Mid-Range Inverter Generator
★★★★☆
The Westinghouse iGen4500 hits the mid-range inverter sweet spot — 3,700 rated watts and 4,500 surge watts covers a window AC unit, refrigerator, and several outlets simultaneously, which handles most homeowners’ critical loads during a typical outage without the bulk and fuel consumption of a 9,000W+ unit. At 52 dB operating noise, it’s whisper-quiet for its output class. Remote start via key fob (included) means you can start the generator without going outside in a storm. The 3.4-gallon fuel tank delivers up to 18 hours of run time at 25% load — one of the longest run times in the mid-range inverter category.
The iGen4500 includes a TT-30R RV outlet in addition to standard household outlets, making it dual-purpose for camping, RV travel, and home backup. USB outlets allow direct device charging without an adapter. Westinghouse’s customer support has consistently received strong marks in the mid-range portable generator space, and parts availability through major retailers (Home Depot, Amazon) is reliable. The primary limitation vs. the Honda EU2200i is long-term reliability data — Westinghouse’s generator lineup is newer to market and doesn’t carry the same decade-spanning reliability record as Honda. For homeowners who want solid inverter performance at a meaningful cost savings below Honda, the iGen4500 is the correct choice.
✓ Pros
- 3,700W rated — covers window AC, refrigerator, and outlets
- Remote key fob start — no need to go outside
- 52 dB — very quiet for its output class
- 18-hour run time at 25% load on 3.4-gal tank
- TT-30R RV outlet — dual-purpose home and camping use
✗ Cons
- Shorter market track record than Honda
- 3,700W insufficient for central AC in most homes
- Gasoline only on this model
View Westinghouse →
Mid-Range Inverter
9
🔋
Champion 3500W Dual Fuel Portable
Best Budget Dual-Fuel Portable Generator
★★★★☆
Champion Power Equipment’s dual-fuel portable generators offer the most accessible entry point into the portable generator market from a nationally recognized brand. The 3500W dual-fuel model runs on gasoline or propane, with the dual-fuel advantage: propane stores indefinitely without degrading, so a unit stored for emergency use that hasn’t been run in months will start reliably on propane without carburetor issues — the single most common reason portable gasoline generators fail to start after extended storage. At 3,500 rated watts, it covers a refrigerator, chest freezer, several outlets, and lighting during an outage.
This is a traditional open-frame generator rather than an inverter design, which means the sine wave output is less clean than Honda or Westinghouse inverter models — acceptable for most appliances and tools but not ideal for CPAP machines or sensitive electronics without a power conditioner. Champion includes a three-year limited warranty and 24/7 customer support, which is stronger aftermarket support than many budget alternatives. For homeowners who want reliable dual-fuel emergency backup at the lowest cost from a recognized brand, the Champion 3500W is the straightforward answer.
✓ Pros
- Dual fuel (gas + propane) — propane stores indefinitely, no carburetor stale-fuel issues
- Lowest cost entry from a recognized national brand
- 3,500W sufficient for refrigerator, freezer, and outlets
- 3-year limited warranty + 24/7 support
✗ Cons
- Open-frame design — not clean sine wave output (not ideal for sensitive electronics)
- Louder than inverter generators
- 3,500W insufficient for AC or well pumps
- Manual pull-start (electric start available on some configurations)
View Champion →
Budget Dual-Fuel
10
🌿
Jackery Explorer 2000 Plus Battery / Solar
Best Indoor / Zero-Emissions Backup Power Station
★★★★☆
The Jackery Explorer 2000 Plus occupies a fundamentally different category from every other unit on this list — it produces zero emissions, operates silently, can be used indoors without any ventilation requirement, and recharges from solar panels, wall outlets, or a vehicle. For homeowners who need short-duration backup power for essential devices (CPAP, medical equipment, phones, laptops, refrigerator for several hours) without the logistics of gasoline storage, the 2000 Plus is the cleanest and most convenient solution. The 2,000Wh battery capacity delivers up to 3,000W of AC output.
The LiFePO4 battery chemistry Jackery uses in the 2000 Plus is more thermally stable and has a longer cycle life than older lithium-ion formulations — Jackery rates the battery for 4,000 full charge cycles before capacity degrades to 80%, which translates to over a decade of regular use. Solar recharging with optional SolarSaga panels makes it genuinely fuel-free during multi-day outages if sunshine is available. The critical limitation is capacity: 2,000Wh is enough to power a refrigerator for 20–30 hours, a CPAP for several nights, or a window AC unit for 1–2 hours. For extended multi-day outages covering whole-home loads, a gasoline or standby generator remains necessary. The Jackery is the right supplement to a gas generator, not a replacement.
✓ Pros
- Zero emissions — safe for indoor use
- Silent operation
- LiFePO4 battery — 4,000+ cycle life
- Solar recharge capable — fuel-free during outages with sunshine
- 3,000W AC output for a battery station
- No fuel storage, no carburetor issues, no exhaust
✗ Cons
- 2,000Wh capacity — not suitable for multi-day whole-home coverage
- Cannot power central AC, well pumps, or high-draw appliances for extended periods
- Higher cost per watt than gasoline generators
- Recharge time on solar is weather-dependent
View Jackery →
Indoor / Solar
Other Generators Worth Considering
Strong models that narrowly missed the top 10 — each is the right answer in specific situations.
Generac Guardian 26kW (Standby)
Generac’s flagship residential standby — 26kW in an air-cooled package that Generac claims takes 68% less space than competitive liquid-cooled units at similar output. For large homes with multiple HVAC zones, well pumps, and high simultaneous electrical demand where the 22kW doesn’t cover the full load. Higher purchase cost but the same Generac installer network and 5-year warranty.
Honda EU7000iS (Inverter — High Output)
Honda’s top-tier residential inverter generator — 5,500 rated watts / 7,000 surge watts with the same Honda reliability as the EU2200i but enough output to handle central AC in smaller homes. Electric start, fuel injection, and Honda’s CO-Minder safety system. The premium Honda price at this wattage is the primary barrier; the DuroMax XP11000iH delivers more watts at lower cost, but Honda’s service network is unmatched.
EcoFlow DELTA Pro Ultra (Battery — Large Capacity)
EcoFlow’s whole-home battery backup system — expandable to 21.6kWh with additional battery modules, 7,200W AC output, solar and grid charging, and an automatic transfer switch option that approaches standby generator territory for all-electric homes or homeowners willing to invest in a full battery ecosystem. Higher upfront cost but zero emissions and silent operation indefinitely.
Other Generator Brands Reviewed
- Yamaha Generators — Yamaha’s EF2200iS inverter generator is the closest competitor to the Honda EU2200i on reliability; Japanese-engineered, equally quiet, but with a smaller U.S. parts and service network than Honda. Excellent for buyers who find Honda priced out of reach and want equivalent engineering quality.
- Ryobi Generators — Ryobi’s inverter lineup offers competitive pricing for homeowners already invested in Ryobi’s 40V battery ecosystem. The gasoline inverter models are solid mid-range performers; the battery-powered models are convenient for short-duration use. Strong Home Depot availability.
- DeWalt Generators — DeWalt’s portable generator lineup targets contractors and job sites but performs well in home backup scenarios. Strong build quality, wide availability at Home Depot and Lowe’s, and compatibility with DeWalt’s FLEXVOLT battery system on select models.
- Powermate Generators — Powermate (formerly Coleman Powermate) is a budget-accessible brand available through Northern Tool and similar retailers. Reliable basic performance for homeowners who need occasional outage coverage and prioritize purchase price over premium features.
- Pulsar Generators — Ultra-budget dual-fuel portable generators well suited for short-duration outage coverage. The 2,200W dual-fuel inverter model from Pulsar offers the propane flexibility advantage at the lowest price point on this list. Service and parts availability are more limited than established brands.
How to Choose the Best Generator for Your Home
Three decisions in order: type, sizing, and fuel. Get those right before evaluating any specific brand.
Standby vs. Portable — The Fundamental Decision
Standby generators start automatically within seconds of a power failure, run on a continuous natural gas or propane supply, and require no manual intervention. Portable generators require you to be present, start manually, run on stored fuel, and require a transfer switch for safe home connection. If you travel frequently, have medical equipment that cannot tolerate power interruption, or experience multi-day outages regularly, a standby generator is the right answer. If you need occasional outage coverage for essentials and can be present to manage the generator, portable is practical.
Size Your Generator to Your Actual Load
Add up the running watts of every appliance you need to power simultaneously — not the surge watts, the running watts. Central air conditioning typically draws 3,000–5,000 running watts. A well pump draws 750–1,500. Refrigerator: 150–400. Lighting: 200–600. A properly sized standby generator covers your critical circuits with 20–25% headroom above total running load. For portable generators, size to the two or three appliances you’ll actually prioritize — not every device in the house. Oversizing wastes money; undersizing trips the breaker under load.
Fuel Type Determines Resilience
Natural gas standby generators connect to your utility gas line — continuous supply, no refueling, no storage. Propane standby generators require an on-site propane tank sized for the expected outage duration (500 gallon minimum for extended outages). Gasoline portable generators require stored fuel with stabilizer treatment — gasoline degrades in 30 days without stabilizer and can clog carburetors, causing the most common reason portable generators fail when needed. Dual-fuel (gas + propane) portable generators solve this by allowing propane as a backup — propane stores indefinitely and doesn’t degrade.
Transfer Switch Is Not Optional
Connecting a portable generator to your home requires either a transfer switch or an interlock kit installed by a licensed electrician. Plugging a generator directly into a wall outlet (backfeeding) is illegal in most jurisdictions, extremely dangerous to utility workers restoring power on the line, and can destroy your generator and electrical system simultaneously. A manual transfer switch costs $200–$500 installed and is the minimum safe configuration. An automatic transfer switch (standard on standby generators) costs more but eliminates the manual step. Never skip this.
Maintenance Determines Reliability
Standby generators run an automatic exercise cycle (typically weekly) that keeps the engine lubricated and the battery charged — minimal owner involvement required beyond annual professional service. Portable generators require more active maintenance: run the engine regularly, use fuel stabilizer if storing with gasoline, change the oil after every 50–100 hours of use, and drain or run dry the carburetor before extended storage. The single most common cause of portable generator failure during an outage is a clogged carburetor from stale gasoline — preventable with $5 of fuel stabilizer added at every fill.
Permits and HOA Rules Apply
Standby generator installation requires a building permit in most jurisdictions, plus inspection by your local electrical authority before it can be energized. Most municipalities require the generator to be a minimum distance from windows, doors, and property lines — typically 5 feet. HOA rules may restrict generator placement, size, or enclosure type. Check local ordinances and HOA guidelines before purchasing a standby unit. Portable generator use during outages is generally unrestricted, but operating a generator within enclosed spaces (garage, carport) remains prohibited regardless of local rules — carbon monoxide risk is immediate and lethal.
NME Generator Awards 2026
Best Overall Standby
22kW whole-home output, largest installer network in the country, Mobile Link Wi-Fi monitoring, True Power Technology, 5-year limited warranty.
2026 Winner
Generac Guardian 22kW
Best Portable Inverter
Widest service and parts network of any portable generator, CO-Minder safety shutoff, 48dB operation, Eco Throttle — the benchmark by which all others are measured.
2026 Winner
Honda EU2200i
Best Indoor Backup
Zero emissions, silent, solar-rechargeable, LiFePO4 4,000-cycle battery — the only backup power option safe for indoor use without ventilation.
2026 Winner
Jackery Explorer 2000 Plus
Best Home Generators FAQ — 2026
The most common questions about home generators answered by the NME editorial team.
What size generator do I need for my home?
Add up the running watts of every appliance you need to power simultaneously. Central air conditioning typically draws 3,000–5,000 running watts. A well pump draws 750–1,500. A refrigerator draws 150–400. Lighting and outlets add 200–600 more. A complete whole-home standby generator should cover your total running load plus 20–25% headroom — which is why 20–22kW is the most commonly installed size for a 2,000–3,000 sq ft home with central AC. For portable generators, size to your two or three most critical appliances. An online generator sizing calculator from Generac or other manufacturers can help you calculate your specific load.
What’s the difference between a standby generator and a portable generator?
A standby generator is permanently installed outside your home, connects to your electrical system through an automatic transfer switch, runs on natural gas or propane, and starts automatically within seconds of a power failure — no manual intervention. A portable generator is a movable unit that requires manual startup, runs on gasoline or dual fuel (gas + propane), must be operated outdoors with adequate ventilation, and requires a transfer switch or interlock kit for safe home connection. Standby generators provide seamless automatic backup; portable generators require you to be present and active to deploy.
How much does it cost to install a whole-home standby generator?
Total installed cost for a whole-home standby generator typically ranges from $5,000 to $15,000 or more, depending on generator size, fuel source, transfer switch type, and local labor rates. The generator unit itself may cost $3,000–$8,000 at the 18–26kW range. Installation — including the transfer switch, electrical work, gas line connection, permit, and inspection — typically adds $2,000–$5,000. Natural gas installations are generally less expensive than propane because they don’t require a tank. Get at least three installer quotes in your market before committing.
Can I run a portable generator indoors or in my garage?
No. Never operate a gasoline or propane generator indoors, in a garage, in a carport, under an awning, or in any enclosed or partially enclosed space. Generator exhaust contains carbon monoxide — a colorless, odorless gas that can reach dangerous concentrations within minutes and be fatal before symptoms are recognized. The generator must be operated outside, positioned so exhaust does not blow toward windows, doors, or air intakes. The CDC recommends a minimum of 20 feet from any opening. Battery-powered backup stations (like the Jackery Explorer) are the only backup power option safe for indoor use.
Do I need a transfer switch for a portable generator?
Yes. Connecting a portable generator to your home without a transfer switch or interlock kit — commonly called backfeeding — is illegal in most jurisdictions and creates a serious electrocution hazard for utility workers restoring power on the line. A transfer switch disconnects your home from the utility grid before connecting generator power, preventing backfeed. A manual transfer switch installed by a licensed electrician costs $200–$500 installed and is the minimum safe and legal configuration. Standby generators include an automatic transfer switch as part of the system.
How long can a standby generator run continuously?
A natural gas standby generator can run indefinitely as long as natural gas service is available — the utility provides continuous fuel supply. During most power outages, natural gas service remains uninterrupted. Propane standby generators run as long as the propane tank supply lasts — a 500-gallon tank at typical residential loads (half-load operation) typically provides 7–10 days of continuous run time depending on generator size and actual load. Standby generators are designed for extended operation and require regular oil changes every 100–200 hours of run time during prolonged outages.
How does NME rank home generators?
NME evaluated 20 generator models across standby and portable categories using five criteria: validated output capacity (rated vs. surge wattage and real-world load coverage), reliability (manufacturer reputation, engine heritage, and installer feedback), fuel flexibility and run time, ease of installation and operation, and value (performance relative to installed cost and warranty terms). Primary sources include U.S. Energy Information Administration outage data, FEMA home backup power guidance, manufacturer specification documentation, and licensed electrician feedback. No brand paid for placement. See our full methodology.
📚 Sources Cited
- U.S. Energy Information Administration — Electric Power Annual: U.S. power outage frequency and duration data by state.
- FEMA — Power Outages: Home backup power guidance, generator safety requirements, and emergency preparedness.
- CDC — Carbon Monoxide from Generators and Other Sources: Generator safety placement requirements and CO poisoning prevention.
- Generac — Guardian Series specifications: 22kW output, G-Force Engine, True Power Technology, Mobile Link monitoring, 5-year warranty.
- Kohler Power — 20RCAT specifications: PowerBoost technology, Command PRO engine, hydraulic valve lifters, all-aluminum enclosure.
- Cummins — RS20A specifications: QuietConnect enclosure, Evo Controller, 20kW output, noise performance data.
- Honda Power Equipment — EU2200i specifications: GXR120 Commercial Series engine, CO-Minder, Eco Throttle, 48-57 dB noise rating.
- DuroMax — XP11000iH specifications: 9,000W rated output, dual-fuel capability, inverter technology.
- Jackery — Explorer 2000 Plus specifications: 2,000Wh LiFePO4 battery, 3,000W AC output, 4,000-cycle rating, solar recharge compatibility.
- NFPA — Generator Safety: Electrical and fire safety requirements for generator installation and operation.
Ready to Choose the Right Generator?
The right generator depends on whether you need automatic standby coverage or portable backup you can deploy manually. Get at least three local installer quotes before committing to a standby unit — installation cost varies significantly by market.
