Buyers researching Generac generators specifically, comparing models within the brand
Generac has been building generators longer than most competitors have existed. Founded in 1959, the company now offers one of the widest portable generator lineups on the market, spanning lightweight inverter models for camping all the way up to 18,000-watt beasts that can replace your utility connection entirely. That breadth is both a strength and a challenge for buyers: with so many models sharing similar naming conventions and overlapping wattage ranges, picking the right Generac can feel overwhelming. This guide cuts through the noise. We tested, scored, and ranked every current Generac portable generator in our database, then selected the ten best models across every wattage tier and use case. Whether you need a quiet inverter for weekend trips, a mid-range conventional unit for storm season, or a full-house replacement powerplant, you will find the right Generac here. We have organized picks from highest-scoring to lowest, but we also break them into logical tiers so you can jump straight to the wattage class that fits your needs. If you are still deciding between Generac and other brands, check out our guides on the best Honda generators and best Westinghouse generators for direct brand comparisons.
| Generator | Link | ||||||
|---|---|---|---|---|---|---|---|
| 1 |  Generac #8063 GP9500ETF Tri-Fuel | 9500W | 0 dB | 219 lbs | $1,169 | 5.6 | |
| 2 |  Generac #8011 GP7500EDF Dual-Fuel | 7500W | 0 dB | 204 lbs | $1,100 | 5.4 | |
| 3 |  Generac #8947 iQ5200DF Dual-Fuel · Inverter | 3900W | 0 dB | 107 lbs | $1,069 | 5.3 | |
| 4 |  Generac #7705 GP15500EFI Gasoline | 15500W | 0 dB | 420 lbs | $4,219 | 5.1 | |
| 5 |  Generac #7715 GP8000E Gasoline | 8000W | 0 dB | 198 lbs | $1,049 | 5.2 | |
| 6 |  Generac #8150 GP5500E Gasoline | 5500W | 0 dB | 163 lbs | $1,051 | 4.9 | |
| 7 | Generac #7680 GP6500 Gasoline | 6500W | 0 dB | 172 lbs | $849 | 4.6 | |
| 8 |  Generac #8917 GP18000EFI Gasoline | 18000W | 0 dB | 442.8 lbs | $4,399 | 4.3 | |
| 9 |  Generac #8251 GP2500i Gasoline · Inverter | 2200W | 0 dB | 48 lbs | $599 | 4.3 | |
| 10 |  Generac #7153 GP3300i Gasoline · Inverter | 2500W | 0 dB | 59.5 lbs | $749 | 4.2 |
Every generator in this guide was evaluated using our standardized scoring system that weighs power output, fuel efficiency, build quality, safety features, outlet versatility, and overall value. We pulled from Generac's full current portable lineup and ranked each model by its composite score. The ten generators featured here represent the highest-scoring Generac models available in 2026. Within the list, you will find conventional open-frame generators and inverter models, gasoline-only units and multi-fuel options, and wattage ranges from 2,200 watts up to 18,000 watts. We did not cherry-pick models to fill arbitrary categories. Instead, we let the scores determine the ranking and then organized the results so buyers can compare within wattage tiers. Pricing context is provided relative to other picks on this list, since exact prices fluctuate. Every specification cited comes directly from manufacturer data and our verified testing records.
Best for homeowners wanting maximum fuel flexibility for extended power outages
Best Overall Generac - Tri-Fuel Flexibility Meets Whole-House Power
The GP9500ETF earns the top spot in our Generac rankings because it combines serious wattage with genuine fuel versatility. Running on gasoline, propane, or natural gas means you are never locked into a single fuel source during extended outages when gas stations close and propane deliveries stop. On gasoline, you get 9,500 running watts and 12,500 starting watts, enough to power a well pump, refrigerator, air handler, and several lighting circuits simultaneously. Propane drops output to 8,550 running watts, and natural gas brings it down to 7,000, but having three options is a meaningful advantage no single-fuel generator can match. The 9.5-hour runtime at half load on gasoline is respectable for a generator this powerful, and the 14-hour runtime at quarter load means overnight coverage without a 3 AM refueling trip. Electric start with a recoil backup, automatic voltage regulation, CO monitoring, and a 50-amp outlet for transfer switch connections round out a feature set that justifies its mid-range price point. At roughly the same cost as the GP7500EDF below, the tri-fuel capability and higher wattage make this the better investment for most homeowners. For a deeper understanding of how starting and running watts affect what you can actually power, see our guide on understanding starting and running watts.
Key Specs: 9,500W running / 12,500W starting (gasoline) · 8,550W running / 11,250W starting (propane) · 7,000W running / 9,000W starting (natural gas) · Tri-Fuel: gasoline, propane, natural gas · 9.5 hrs at 50% load (gasoline) · 14 hrs at 25% load (gasoline) · 219 lbs · 7.5-gallon fuel tank · CO sensor with auto-shutoff · Electric start with recoil backup
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Best for homeowners wanting dual-fuel backup without paying for tri-fuel capability
Dual-Fuel Workhorse With Strong Gasoline Runtime
The GP7500EDF sits just below the top pick in our scoring, and for many buyers it may actually be the smarter purchase. It delivers 7,500 running watts on gasoline with 9,400 starting watts, which is enough to run a central air conditioner, refrigerator, well pump, and several smaller loads at the same time. The dual-fuel design lets you switch between gasoline and propane, dropping to 6,800 running watts on LP but giving you a backup fuel source when gas stations are tapped out. What sets this model apart from the GP9500ETF above is its slightly larger fuel tank at 7.9 gallons and a solid 10-hour runtime at half load on gasoline. It also ships with a more complete accessory kit including a battery charger, funnel, and propane hose. Priced roughly the same as the tri-fuel model above, the tradeoff is straightforward: you lose natural gas capability and about 2,000 watts of output but gain a marginally better fuel tank and the included charger. The 420cc engine is proven and parts are widely available. For homeowners who do not have a natural gas line and want reliable dual-fuel backup, this is the sweet spot in the Generac lineup.
Key Specs: 7,500W running / 9,400W starting (gasoline) · 6,800W running / 8,500W starting (propane) · Dual-Fuel: gasoline and propane · 10 hrs at 50% load (gasoline) · 7.9-gallon fuel tank · 204 lbs · 420cc OHV engine · CO sensor with auto-shutoff · Electric start with recoil backup
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Best for buyers who need clean inverter power with dual-fuel backup capability
Best Generac Inverter - Clean Power With Dual-Fuel Versatility
The iQ5200DF is the highest-scoring inverter generator in Generac's lineup, and it occupies a unique niche: dual-fuel inverter power at a wattage level that can handle real home backup duties. With 3,900 running watts on gasoline and 3,500 on propane, it powers refrigerators, sump pumps, window AC units, and electronics simultaneously, though it will not run central air conditioning. The inverter technology keeps total harmonic distortion below 3%, which means laptops, CPAP machines, and smart home devices run without voltage-related risk. This is a meaningful upgrade over conventional generators for anyone powering sensitive electronics. At 107 lbs, it is significantly lighter than the conventional models above, and the parallel capability means you can link two units for double the output. The 15-hour runtime at quarter load on gasoline and 20 hours on propane at the same load are exceptional figures that mean genuine overnight coverage. Priced similarly to the conventional GP7500EDF, you are trading raw wattage for clean power and fuel flexibility. If your priority is protecting electronics and you do not need to run central HVAC, this is the Generac to buy. For more on why clean power matters, read our guide on why some generators kill appliances and others do not.
Key Specs: 3,900W running / 5,200W starting (gasoline) · 3,500W running / 4,700W starting (propane) · Dual-Fuel: gasoline and propane · Less than 3% THD (inverter) · 15 hrs at 25% load (gasoline) · 20 hrs at 25% load (propane) · 107 lbs · 3.2-gallon fuel tank · Parallel capable · USB-A and USB-C ports
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Best for homeowners who need standby-level whole-house power without permanent installation
EFI-Powered Whole-House Replacement at 15,500 Watts
The GP15500EFI is where Generac starts competing with permanently installed standby generators. At 15,500 running watts and 19,300 starting watts, this unit can run central air conditioning, a well pump, an electric range, a clothes dryer, and full household lighting circuits all at once. The Electronic Fuel Injection system is the headline feature here: unlike carbureted generators that deliver a fixed fuel mixture regardless of load, EFI adjusts fuel delivery in real time, which means better fuel economy at partial loads and more reliable cold-weather starting. The Generac G-Force engine is an overhead valve, overhead intake design built specifically for generator duty, not repurposed from a lawn mower. At 420 lbs, this is not a generator you move around casually. It is a semi-permanent installation that rolls into position and stays there. The price reflects its capability, sitting at roughly four times the cost of the mid-range picks on this list, but for homeowners who want standby-level power without the installation cost of a permanent system, it delivers. The 14.2-gallon tank provides 11 hours at half load, and the full outlet panel includes both 30-amp and 50-amp receptacles for transfer switch flexibility. This is a premium option, but you get genuine whole-house coverage. For help determining if you actually need this much power, check our guide on how to size a generator for your home.
Key Specs: 15,500W running / 19,300W starting · Electronic Fuel Injection (EFI) · Generac G-Force OVHI engine (816cc) · 11 hrs at 50% load · 14.2-gallon fuel tank · 420 lbs · Less than 5% THD · 50A and 30A outlets · RV-ready · Electric start
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Continue reading below for picks #5–10.
Skip to #5 ↓| Spec | Generac #8063 GP9500ETF | Generac #8011 GP7500EDF | Generac #8947 iQ5200DF | Generac #7705 GP15500EFI |
|---|---|---|---|---|
| Running watts | 9500 W | 7500 W | 3900 W | 15500 W |
| Starting watts | 12500 W | 9400 W | 5200 W | 19300 W |
| Noise (dB) | 0 dB | 0 dB | 0 dB | 0 dB |
| Weight | 219 lbs | 204 lbs | 107 lbs | 420 lbs |
| Run time @50% | 9.5 h | 10 h | 9 h | 11 h |
| Fuel | Tri-Fuel | Dual-Fuel | Dual-Fuel | Gasoline |
| Voltage (AC) | 120/240 | 120/240 | 120 | 120/240 |
| Voltage (DC) | — | — | 5 | — |
| Warranty | 3 years | 3 years | 3 years | 3 years |
| Inverter |
Best for budget-conscious homeowners who want maximum wattage per dollar
Best Value Conventional Generator - 8,000 Watts Under a Grand
The GP8000E represents the value sweet spot in Generac's conventional lineup. It delivers 8,000 running watts and 10,000 starting watts on gasoline, which is enough to run a refrigerator, well pump, window air conditioner, sump pump, and several lighting circuits simultaneously. At roughly the same price as the GP5500E below but with 2,500 more running watts, the math strongly favors this model for anyone who does not specifically need a smaller unit. The 15-hour runtime at quarter load means you can power essentials through an entire night on a single 7.9-gallon tank, and the 10-hour runtime at half load covers most daytime outage scenarios. The 420cc engine is the same proven powerplant found in the GP7500EDF, so parts availability and service knowledge are widespread. What you give up compared to the dual-fuel models above is fuel flexibility: this is gasoline only. But if you keep fuel stored properly and do not anticipate multi-day outages where gasoline supply becomes an issue, the GP8000E delivers more watts per dollar than almost anything else in the Generac catalog. The bonded neutral design also simplifies transfer switch installations.
Key Specs: 8,000W running / 10,000W starting · Gasoline only · 15 hrs at 25% load · 10 hrs at 50% load · 7.9-gallon fuel tank · 198 lbs · 420cc OHV engine · CO sensor with auto-shutoff · Electric start with recoil backup · Bonded neutral
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Best for California buyers or those needing a CARB-compliant Generac conventional generator
CARB-Compliant Mid-Range Backup With Electric Start
The GP5500E fills the mid-range slot in Generac's conventional lineup, delivering 5,500 running watts and 6,875 starting watts from a 298cc engine. This is enough power to run a refrigerator, sump pump, several lights, and a window air conditioner, but you will need to manage loads carefully if you want to add a well pump or power tools to the mix. What distinguishes this model from the GP8000E above is its CARB compliance, making it one of the few Generac conventionals that California buyers can legally purchase. It also weighs 35 lbs less at 163 lbs, which matters if you need to move it between storage and deployment positions regularly. The 10.5-hour runtime at half load from a 5.4-gallon tank is efficient, and the 13.4-hour quarter-load runtime provides solid overnight coverage. Priced similarly to the GP8000E, the value proposition is weaker on pure wattage, but CARB compliance and the lighter weight justify the choice for specific buyers. The 2-year residential warranty is shorter than the 3-year coverage on most other Generac models on this list, which is worth noting.
Key Specs: 5,500W running / 6,875W starting · Gasoline only · 10.5 hrs at 50% load · 13.4 hrs at 25% load · 5.4-gallon fuel tank · 163 lbs · 298cc OHV engine · CARB and EPA compliant · Electric start with recoil backup · CO sensor
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Best for contractors and budget buyers who want reliable jobsite power at the lowest Generac price
No-Frills Jobsite Generator With Recoil-Only Simplicity
The GP6500 is the most affordable conventional generator on this list, and it earns its spot through straightforward reliability rather than feature count. At 6,500 running watts and 8,125 starting watts, it handles air compressors, circular saws, and multiple power tools on a job site, or powers essential home circuits during outages. The recoil-only start means no battery to maintain, no electric starter motor to fail, and one less thing to troubleshoot when you need power immediately. The 389cc engine and 6.9-gallon tank deliver 10.5 hours at half load, which is competitive for this class. At roughly 20% less than the GP8000E, you are saving meaningful money while still getting enough wattage for most backup scenarios. The tradeoff is clear: no electric start, no dual-fuel capability, and a published THD of 20%, which means this generator should not power sensitive electronics without a surge protector or UPS buffer. This is a tool, not a tech-friendly power source. For contractors and homeowners who want a reliable pull-start generator at the lowest possible Generac price point, the GP6500 delivers.
Key Specs: 6,500W running / 8,125W starting · Gasoline only · 10.5 hrs at 50% load · 6.9-gallon fuel tank · 172 lbs · 389cc OHV engine · Recoil start only · 20% THD · CO sensor with auto-shutoff
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Best for large homes or commercial users who need maximum portable generator output
Maximum Portable Power - 18,000 Watts With EFI Technology
The GP18000EFI is the most powerful portable generator Generac makes, and it exists for buyers who need to replace their entire utility connection. At 18,000 running watts and 22,500 starting watts, this unit can simultaneously power central air conditioning, an electric water heater, a well pump, kitchen appliances, a clothes dryer, and every light in the house. The Electronic Fuel Injection system optimizes fuel delivery based on actual load, which matters enormously when you are burning through a 14.2-gallon tank. The G-Force engine is the same 816cc overhead valve, overhead intake design found in the GP15500EFI, but tuned for higher output. At nearly 443 lbs, this is not portable in any practical sense. It rolls into position on its 12-inch never-flat wheels and stays there. The price is the highest on this list, roughly matching the GP15500EFI, and the question buyers need to answer is whether the extra 2,500 running watts justify the additional weight and fuel consumption. For large homes with high electrical demands or commercial applications, the answer is yes. For most residential users, the GP15500EFI provides sufficient headroom at a similar cost. CARB compliance is a notable advantage over the GP15500EFI for California buyers. For context on generators in this extreme wattage class, see our guide on the best 20,000-watt mega generators.
Key Specs: 18,000W running / 22,500W starting · Electronic Fuel Injection (EFI) · Generac G-Force OVHI engine (816cc) · 9 hrs at 50% load · 14.2-gallon fuel tank · 442.8 lbs · Less than 5% THD · 50A, 30A, and 20A outlets · CARB and EPA compliant · Electric start, battery included
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Best for campers, tailgaters, and anyone needing ultralight portable backup power
Ultralight Inverter for Camping and Emergency Essentials
The GP2500i is Generac's entry-level inverter generator, and at 48 lbs it is genuinely portable in a way that none of the conventional models on this list can match. With 2,200 running watts and 2,500 starting watts, it powers a small RV air conditioner, a few lights, a phone charger, and a mini fridge, or serves as emergency backup for the absolute essentials at home. The inverter technology produces clean power safe for laptops, phones, and medical devices, and the parallel capability means you can link two GP2500i units for 4,400 running watts when a single unit is not enough. The 8-hour runtime at quarter load from a 1-gallon tank is decent for the size, though the 4.5-hour half-load runtime means frequent refueling during sustained use. At roughly half the price of the iQ5200DF inverter above, this is the most affordable inverter on our list. The tradeoff is obvious: less than half the wattage and no dual-fuel option. But for campers, tailgaters, and homeowners who just need to keep phones charged and a few lights on during short outages, the GP2500i is the right tool at the right price. For more options in this class, see our guide on the best 2,000-watt generators.
Key Specs: 2,200W running / 2,500W starting · Gasoline only · 8 hrs at 25% load · 4.5 hrs at 50% load · 1-gallon fuel tank · 48 lbs · 98cc OHV engine · Parallel capable · 12V DC outlet and USB-A ports · CO sensor
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Best for RV owners and light-duty backup users who need a 30-amp inverter connection
Step-Up Inverter With 30A Outlet and Sub-3% THD
The GP3300i slots between the GP2500i and the iQ5200DF in Generac's inverter lineup, offering 2,500 running watts and 3,300 starting watts at 59.5 lbs. The key upgrade over the GP2500i is the addition of a 30-amp L5-30R outlet, which is the standard RV connection that many transfer switches and RV power cords use. This single outlet addition transforms the GP3300i from a recreational toy into a legitimate light-duty backup generator. The sub-3% THD matches the iQ5200DF's clean power output, and the parallel capability remains, meaning two GP3300i units deliver 5,000 running watts with transfer-switch-ready connections. At roughly 25% more than the GP2500i, the extra 300 running watts and the 30-amp outlet justify the price bump for most buyers. The 4.5-hour half-load runtime from a 1.06-gallon tank is identical to the GP2500i, which highlights the main limitation of both small inverters: tiny fuel tanks. The 7-hour quarter-load runtime is adequate for overnight use if loads are kept minimal. For buyers who want Generac inverter quality with just enough output and connectivity for RV use or light home backup, the GP3300i hits the mark. Compare it against other portable options in our best generators for RV camping guide.
Key Specs: 2,500W running / 3,300W starting · Gasoline only · 7 hrs at 25% load · 4.5 hrs at 50% load · 1.06-gallon fuel tank · 59.5 lbs · 149cc OHV engine · Less than 3% THD · 30A L5-30R outlet · Parallel capable
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⚠️ WARNING: NEVER run or NEVER operate a generator indoors, in a garage, in a basement, or in any enclosed or partially enclosed space. Generators produce carbon monoxide, an odorless, colorless gas that can kill within minutes. Always operate your generator outdoors only, at least 20 feet away from windows, doors, and vents, with the exhaust directed away from any occupied structure.
⚠️ WARNING: While many Generac models on this list include CO sensors with automatic shutoff, these are backup safety features and not substitutes for proper placement. Always position the generator outdoors only and at least 20 feet from windows, doors, and vents regardless of whether a CO sensor is present.
⚠️ WARNING: Store gasoline and propane in approved containers and keep them away from living areas, ignition sources, and the generator itself while it is running. Never refuel a hot generator. Shut it down, let it cool for several minutes, and refuel in a well-ventilated area.
⚠️ WARNING: NEVER connect or NEVER plug a generator directly into a wall outlet or your home's electrical panel. This creates a deadly backfeed condition that can electrocute utility workers and damage your equipment. Always use a properly installed transfer switch to connect a generator to your home's wiring. Have a licensed electrician install the transfer switch before you need it.
⚠️ WARNING: Keep children and pets away from operating generators. The engine, exhaust, and electrical connections present burn, shock, and entanglement hazards. Establish a clear safety perimeter around the generator during operation.
Generac's conventional generators (GP series with numbers like GP8000E, GP6500) use a standard alternator that produces power with higher harmonic distortion, typically 5-20% THD. They deliver more watts per dollar but are louder and can damage sensitive electronics. Generac's inverter generators (iQ and GP models with an 'i' suffix like iQ5200DF, GP2500i, GP3300i) use electronic circuitry to produce clean power with less than 3% THD, making them safe for laptops, phones, and medical devices. Inverters are also quieter and more fuel-efficient at partial loads, but cost more per watt of output.
It depends on your outage risk profile. If you live in an area prone to extended outages lasting multiple days, where gas stations may close and fuel deliveries stop, having propane or natural gas as a backup fuel source is genuinely valuable. Propane stores indefinitely without degradation, unlike gasoline which can go stale in months. The tri-fuel GP9500ETF adds natural gas, which flows continuously through utility lines even when the power grid is down in many areas. For short outages of a few hours, gasoline-only models work fine and save you money.
It depends on your home's electrical demands and the generator's wattage. The GP15500EFI and GP18000EFI can power most homes including central air conditioning. The GP8000E and GP9500ETF can handle essential circuits but typically not central AC. Smaller models like the GP5500E and below are limited to select circuits. In all cases, you need a properly installed transfer switch to safely connect a generator to your home's wiring. Have an electrician install one before storm season.
EFI stands for Electronic Fuel Injection. Instead of a carburetor that delivers a fixed fuel-air mixture, EFI uses sensors and an electronic control module to adjust fuel delivery based on actual engine load. This means better fuel efficiency at partial loads, more reliable starting in cold weather, and smoother operation across varying loads. On the GP15500EFI and GP18000EFI, EFI is a meaningful upgrade because these large engines consume significant fuel. On smaller generators, the cost of EFI technology is harder to justify.
Parallel capability means you can connect two identical inverter generators together using a parallel kit cable to combine their output. Two GP2500i units would deliver approximately 4,400 running watts, and two GP3300i units would deliver approximately 5,000 running watts. This lets you start with one unit and add a second later as your power needs grow. Parallel operation only works between matching models and requires a separate parallel kit cable, which is not included with the generators.
Only some models. On this list, the Generac iQ5200DF, GP5500E, and GP18000EFI are CARB certified and legal for sale in California. The remaining models are EPA compliant only. If you live in California or another state that follows CARB emissions standards, verify compliance before purchasing. Non-CARB generators typically cannot be shipped to California by authorized retailers.
Generac offers the widest selection of any single brand, with models spanning from 2,200 watts to 18,000 watts across both inverter and conventional categories. Honda is known for exceptional build quality and quiet operation but at significantly higher prices and with a smaller lineup. Westinghouse offers aggressive pricing and strong feature sets, particularly in the dual-fuel conventional category. Generac sits in the middle, offering good value with broad selection and widely available parts and service. For detailed brand comparisons, see our guides on the best Honda generators and best Westinghouse generators.
Regular maintenance includes changing the engine oil after the first 20-30 hours and every 100 hours thereafter, replacing the spark plug annually or every 200 hours, cleaning or replacing the air filter every 50-100 hours, and inspecting the fuel system for leaks or degradation. If using gasoline, add fuel stabilizer if the generator will sit unused for more than 30 days, or run the carburetor dry before storage. Generac recommends using 10W-30 or SAE 30 oil depending on the model and ambient temperature. Check your specific model's owner manual for exact intervals.
